Hatteras 48 Motor Yacht (1981-84)
Built 1981–1984 by Hatteras Yachts
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About the Hatteras 48 Motor Yacht (1981-84)
Researched from public sources for this model. Any individual boat may have been modified or repowered — confirm before relying on any figure.
- Built
- 1981–1984
- Builder
- Hatteras Yachts
- Length
- 48.67 ft
- Beam
- 15 ft
- Draft
- 3.92 ft
- Displacement
- 45,000 lb
- Hull
- fiberglass
- Hull / keel
- planing
- Propulsion
- inboard
- Fuel
- 590 gal
- Water
- 190 gal
- Holding
- 90 gal
- Generator
- standard
- Stern thruster
- not fitted
- Steering
- hydraulic · Hynautic
Tank capacities — where the figures come from
-
Fuel 590 gal
“Based on 531 gal. available from 590-gal. tankage.” — review (1981 (Boating, July 1981 test, reprinted), hatterasowners.comA July 1981 Boating magazine boat test, reprinted as Hatteras literature and archived on the Hatteras owners' site, gives 590 gal, agreeing with our earlier figure. The builder's 1982 brochure has no tank table.
-
Water 190 gal
Neither the 1981 magazine test nor the 1982 builder brochure gives water capacity.
-
Water heater unknown
Neither the Hatteras Forty Eight brochure (1982) nor Boating's 1981 test reprint names a water heater; the test's standard machinery list includes a pressure water system and dockside hookup only.
Tanks are often replaced or added on older boats — check the tank labels or a survey for yours.
Thrusters and steering — where this comes from
-
Bow thruster unknown
The 1982 builder brochure and the July 1981 Boating test (standard equipment summary and the test boat's long option list) mention no thruster; neither is a full option list.
-
Stern thruster not fitted
Our earlier figure of none has no source, and nothing was found either way.
-
Steering hydraulic · Hynautic
“Steering is Hynautic hydraulic, and is fast ratio. This explained the unusually large 22" diameter helm wheel” — review (1981), hatterasowners.comOne source: Boating magazine's Boat Test No. 301 (July 1981, reprinted by Hatteras) describes fast-ratio Hynautic hydraulic steering with a 22-inch wheel on the test boat; a lower helm was optional. The 1982 brochure is silent on steering.
Thrusters and steering are often replaced — check the units on your boat before ordering parts.
'Dual mode' hull meant for efficient displacement running with planing ability given bigger engines (HMY lists hull type as modified-V; recorded as planing, though with base engines it runs at displacement speed). Heavy solid-glass build, long keel, 7-deg deadrise. Three staterooms, three heads, very large aft deck, hardtop standard.
Engines fitted
-
Detroit Diesel 6-71N — 285 hp, diesel, twin
standard
HMY: 285 hp 6-71Ns give about 1 mpg at 8 kn but struggle to plane when loaded.Sources: hmy.com
-
Detroit Diesel 6V92TA — 425 hp, diesel, twin
factory option
HMY: 425 hp 6V92s cruise 14-15 kn. 1981 boats are listed with twin 6V92TAs rated 435 hp and 335 hp, so ratings vary by boat.Sources: hmy.com · curtisstokes.net · tampayachtsales.com
Boats of the same model can differ — check which engines yours actually has before ordering parts.
Generator
standard
“the twin banks of heavy-duty batteries with automatic charger, and the standard 15 kw generator” — brochure (1982), hatterasowners.com · “A lot of very good stuff is standard. Samples: generator (15 kw) in sound enclosure ... Machinery: ... 15 kw fwc generat” — review (1981), hatterasowners.com
The builder brochure and Boating Boat Test No. 301 agree that a 15 kW generator was standard. The make isn't confirmed; one owner's post about a 48 Long Range Cruiser suggests Onan.
-
Generator (make not stated) — 15 kW, diesel
standard
Freshwater-cooled, in a sound enclosure. Hatteras doesn't name the make; an owners' association forum post calls the original 15 kW set on a sister 48 Long Range Cruiser an Onan, not confirmed for the 48 Motor Yacht. Diesel is assumed because the boat is all-diesel (6-71N or 6V-92TA main engines); n“the standard 15 kw generator” — brochure (1982), hatterasowners.com · “15 kw fwc generator (standard machinery)” — review (1981), hatterasowners.com
Generators are often replaced or added — check the unit's own plate before ordering parts.
Manuals and brochures online
- Brochure Hatteras Forty Eight Motor Yacht / Cockpit Motor Yacht sales brochure (no tankage table) (1982 (48 MY/CMY 15 0982)) — hatterasowners.com
- Brochure Hatteras 48 Motor Yacht Series I sales brochure and magazine article archive (1981-1984) — hatterasowners.com
- Document Boating magazine Boat Test No. 301, Hatteras 48 Motor Yacht (July 1981), Hatteras reprint (1981) — hatterasowners.com
Hosted by the builder or an owners' association; they own the copyright.
Known problems for this model
-
Underpowered with base 6-71Ns engine
The 285hp 6-71N boats run efficiently at about 8 knots but may not plane when fully loaded; 425hp 6V92s are needed for 14-15 knot cruising.hmy.com
Engines & parts
Detroit Diesel 6-71 (inline, N / T / TI) parts: good
Factory standard engine — you entered “Detroit Diesel 6-71N”
Two-stroke 71-series engine with a huge commercial, bus and marine population; basic engine parts and complete overhaul kits (liners, pistons, injectors, blowers, bearings, gaskets) are cheap and widely available from Diesel Pro Power, Highway and Heavy Parts and others. Some marine-specific parts (coolers, manifolds) are harder to find. Designed to be rebuilt in-frame repeatedly; naturally aspirated engines with good care have been reported past 15,000 hours, turbo versions more like 3,000–5,000.
Parts sources: Diesel Pro Power (Detroit Diesel parts), Highway and Heavy Parts (Series 71)
Common problems (2)
-
Oil leaks engine
Owners describe 71-series Detroits as habitual oil leakers; chasing leaks with the right gaskets and sealants is a routine topic even on freshly rebuilt engines.trawlerforum.com · cruisersforum.com
-
Noise and smoke exhaust
Injector and exhaust noise is loud unless mufflers are well designed, and some smoke is typical of the two-stroke design.trawlerforum.com
Maker’s service schedule (18)
| Engine oil & filter change | 150 hrs | “Industrial & Marine 150 Hours (max. engine oil change interval, fuel sulfur 0 to .50%)” — manufacturer, archive.org |
| Fuel filters & water separator | 300 hrs | “Install new elements every 300 hours or when plugging is indicated (Item 13 fuel strainer and filter)” — manufacturer, archive.org |
| Coolant replacement & freeze-point test | 1,000 hrs | “Clean the cooling system every 1,000 hours using a good radiator cleaning compound” — manufacturer, archive.org |
| Engine pencil zincs | 500 hrs | “Every 500 hours ... remove the zinc electrodes from the inlet side of the raw water pump and the heat exchanger” — manufacturer, archive.org |
| Heat exchanger & oil cooler cleaning | 1,000 hrs | “remove the retaining cover every 1,000 hours and inspect the heat exchanger core” — manufacturer, archive.org |
| Drive belts inspect / replace | 200 hrs | “check the tension of the drive belts every 200 hours” — manufacturer, archive.org |
| Air filter / intake silencer dry-type air cleaner | 1 yr | “Dry type elements should be discarded and replaced with new elements after one year of service or when the maximum allow” — manufacturer, archive.org |
| Transmission fluid change Allison Torqmatic M / MH marine gear | 200 hrs | “Drain the oil every 200 hours and flush the gear with light engine oil (Item 41 Torqmatic marine gear)” — manufacturer, archive.org |
| Clean crankcase breather | 1,000 hrs | “Remove the externally mounted crankcase breather assembly every 1,000 hours and wash the steel mesh pad” — manufacturer, archive.org |
| Inspect blower screen | 1,000 hrs | “Inspect the blower screen and gasket assembly every 1,000 hours” — manufacturer, archive.org |
| Check / clean air box drain tubes | 1,000 hrs | “check for flow of air from the air box drain tubes every 1,000 hours” — manufacturer, archive.org |
| Check thermostats and seals | 5,000 hrs or 1 yr | “Check the thermostats and seals at 5,000 hours or once a year” — manufacturer, archive.org |
| Inspect all hoses | 500 hrs or 1 yr | “all hoses should be thoroughly inspected at least every 500 operating hours ... and/or annually” — manufacturer, archive.org |
| Drain water/sediment from fuel tank | 500 hrs | “Open the drain at the bottom of the fuel tank every 500 hours to drain off any water and/or sediment” — manufacturer, archive.org |
| Coolant filter/conditioner element (if fitted) | 500 hrs | “the filter element should be changed every 500” — manufacturer, archive.org |
| Check emergency (air) shutdown | 700 hrs | “check the operation of the emergency shutdown every 700 hours” — manufacturer, archive.org |
| Check engine and transmission mounts | 2,000 hrs | “Check the engine and transmission mounting bolts and the condition of the mounting pads every 2,000 hours” — manufacturer, archive.org |
| Replace fresh-water pump seal | 6,000 hrs | “Replace the water pump seal after it has been in service for 6,000 hours” — manufacturer, archive.org |
Service part numbers (7)
| Raw-water impeller Detroit raw-water pump with 2 1/2 in. impeller (pumps 5115396 / 23507971) |
Detroit Diesel 5193602 | “Impeller for Detroit Diesel and Volvo Penta Marine Water Pumps 5193602 Impeller with 10 Blades and 12 Spline Drive” — dealer, dieselpro.com · “Detroit Diesel Series 71 Raw Water Pump Impeller, New (5193602)” — dealer, highwayandheavyparts.com |
| Raw-water pump kit pumps 5115396 / 23507971 (2 1/2 in. impeller) |
Detroit Diesel 5197224 | “Detroit Diesel Marine Water Pump repair kit 6V53, 6V71, 6-71, 6V92 5197224P For 2 1/2" impeller height” — dealer, dieselpro.com · “A-5197224 1 1 1 Reconditioning Kit ... Pumps #5115396,#23507971” — dealer, interstate-mcbee.com |
| Raw-water pump kit pumps 5122599 / 23507972 (3 1/2 in. impeller) |
Detroit Diesel 5197222 | “Detroit Diesel Marine Water Pump repair kit for 6-71, 8V71, 8V53, 12V71, 6V92, 8V92 5197222” — dealer, dieselpro.com · “A-5197222 1 1 1 Reconditioning Kit Pumps #5122599,#23507972” — dealer, interstate-mcbee.com |
| Zinc / anode electrode assembly, 2 1/8 in., at raw-water pump inlet |
Detroit Diesel 8517479 | “A-8517479 1 1 1 Electrode Assembly - 2 1/8" L At pump inlet” — dealer, interstate-mcbee.com · “Detroit Diesel Electrode, 2.125" Long (8517479) - In-Line 71 Series Heat Exchangers” — dealer, powerlinecomponents.com |
| Zinc / anode electrode assembly, 3 3/8 in., in heat exchanger |
Detroit Diesel 8515850 | “A-8515850 1 1 1 Electrode Assembly - 3 3/8" L In exchanger” — dealer, interstate-mcbee.com · “Detroit Diesel Zinc Electrode, 3.375" Long (8515850) - In-Line 71 Series Heat Exchangers” — dealer, powerlinecomponents.com |
| Thermostat 173 F non-blocking type |
Detroit Diesel 5172141 | “57 5.2050 5172141 Thermostat Assy.” — manufacturer, tractorparts.com · “Detroit Diesel Thermostat for 371, 471, 671 5172141” — dealer, dieselpro.com |
| Thermostat 170 F full-blocking type (needs seal 5132155) |
Detroit Diesel 23503826 | “A-23503826 1 1 Thermostat 170° F Full blocking use seal” — dealer, interstate-mcbee.com · “Detroit Diesel Thermostat, 170 Deg. (23503826)” — dealer, powerlinecomponents.com |
From the engine maker’s parts lists, or two independent parts dealers. Numbers change with serial number and get superseded — check yours before ordering.
Detroit Diesel 6V-92TA parts: good
Factory optional engine — you entered “Detroit Diesel 6V92TA”
Two-stroke 92-series V6; overhaul kits and parts are sold by the Detroit aftermarket (Diesel Pro Power and others).
Parts sources: Diesel Pro Power (Detroit Diesel parts)
Common problems (1)
-
Overheating at cruise in warm water cooling
Turbo 92-series engines have little cooling margin; fouled heat exchangers and gear coolers, scale, blocked strainers, too-rich antifreeze mixes, or a gear cooler on the pump's suction side commonly push temperatures up at cruise rpm.samsmarine.com · dieselpro.com
Maker’s service schedule (28)
| Engine oil & filter change | 150 hrs | “Industrial & Marine 150 Hours (max. engine oil change interval)” — manufacturer, archive.org |
| Fuel filters & water separator mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 300 hrs | “Install new elements every 300 hours or when plugging is indicated” — manufacturer, archive.org |
| Fuel filters & water separator DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) | 150 hrs | “150 HOUR ... Fuel/Water Separator and Filter (10) - Replace” — manufacturer, archive.org |
| Coolant replacement & freeze-point test mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 1,000 hrs | “Clean the cooling system every 1,000 hours using a good radiator cleaning compound” — manufacturer, archive.org |
| Coolant replacement & freeze-point test DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) | 4,000 hrs or 2 yrs | “replacing coolant ... annually. However, a cooling system properly maintained and protected with supplemental corrosion” — manufacturer, archive.org |
| Engine pencil zincs mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 500 hrs or 1 yr | “Every 500 hours or annually, drain the water from the heat exchanger raw water inlet and outlet tubes ... [remove the zi” — manufacturer, archive.org |
| Engine pencil zincs DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) | 1 yr | “Heat exchanger "zincs" should be checked initially every 60 hours, then as required or annually” — manufacturer, archive.org |
| Heat exchanger & oil cooler cleaning mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 1,000 hrs | “remove the retaining cover every 1,000 hours and inspect the heat exchanger core” — manufacturer, archive.org |
| Heat exchanger & oil cooler cleaning DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) | 4,000 hrs or 4 yrs | “Replace tube and shell type heat exchangers on marine engines every 4 years or 4,000 hours, whichever comes first” — manufacturer, archive.org |
| Drive belts inspect / replace mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 200 hrs | “check the tension of the drive belts every 200 hours” — manufacturer, archive.org |
| Drive belts inspect / replace DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) - pleasure craft | 1,000 hrs | “check the tension of the drive belts every 200 hours (150 hours on marine units)” — manufacturer, archive.org |
| Injector test / service DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) - pleasure craft | 1,000 hrs | “Replace fuel injectors on pleasure craft marine engines every 1,000 hours of operation” — manufacturer, archive.org |
| Injector test / service DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) - commercial marine | 5,000 hrs | “Replace injectors on commercial marine engines every 5,000 hours of operation” — manufacturer, archive.org |
| Air filter / intake silencer mechanical-governor engines (1985 Series 92 operator's manual 6SE381) - dry-type air cleaner | 1 yr | “replaced with new elements after one year of service or when the maximum allowable air intake restriction has been reach” — manufacturer, archive.org |
| Air filter / intake silencer DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) - marine air separators | 500 hrs or 1 yr | “Replace filter elements after one year or 500 hours of engine operation, whichever comes first” — manufacturer, archive.org |
| Transmission fluid change Allison Torqmatic marine gear (1985 manual) | 200 hrs | “Torqmatic Marine Gear (6V and 8V): ... Drain the oil every 200 hours and flush the gear with light engine oil” — manufacturer, archive.org |
| Clean crankcase breather mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 1,000 hrs | “[Remove the externally mounted crankcase] breather assembly every 1,000 hours and wash the steel mesh pad” — manufacturer, archive.org |
| Clean crankcase breather DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) | 5,000 hrs | “crankcase breather assembly should be removed and the steel mesh pad cleaned ... every 1,000 hours (5,000 hours on marin” — manufacturer, archive.org |
| Replace cooling system hoses DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) - pleasure craft | 1,000 hrs | “Replace all cooling system hoses on pleasure craft marine engines after 1,000 hours of service, regardless of apparent c” — manufacturer, archive.org |
| Replace fuel/boost coolers and marine gear oil cooler DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) | 4,000 hrs or 4 yrs | “Replace marine gear oil coolers every 4 years or 4,000 hours, whichever comes first” — manufacturer, archive.org |
| Inspect blower screen mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 1,000 hrs | “[Inspect the blower screen and gasket assembly] every 1,000 hours” — manufacturer, archive.org |
| Check thermostats and seals mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 5,000 hrs or 1 yr | “Check the thermostats and seals at 5,000 hours or once a year” — manufacturer, archive.org |
| Replace thermostats and seals DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) | 4,000 hrs | “Thermostats & Seals (31) - Replace [4,000 hours column, marine chart]” — manufacturer, archive.org |
| Inspect all hoses mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 500 hrs or 1 yr | “all hoses should be thoroughly inspected at least every 500 operating hours (1,000 hours for the fire-resistant ...) and” — manufacturer, archive.org |
| Coolant filter/conditioner element (if fitted) mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 500 hrs | “[coolant filter element should be] changed every 500 hours” — manufacturer, archive.org |
| Test air shutdown valve DDEC II/III engines (1994 Series 92 operator's guide 68E506, marine chart) | 500 hrs or 1 yr | “at least once a year or after 700 hours of engine operation (500 hours on marine units), whichever comes first” — manufacturer, archive.org |
| Check engine and marine gear mounts | 2,000 hrs | “the condition of the mounting pads every 2,000 hours” — manufacturer, archive.org |
| Replace fresh-water pump seal mechanical-governor engines (1985 Series 92 operator's manual 6SE381) | 6,000 hrs | “[Replace the water pump seal after it has been in] service for 6,000 hours” — manufacturer, archive.org |
Service part numbers (14)
| Oil filter full-flow cartridge element (shell-type filter) |
Detroit Diesel 5573014 Also: AC Delco PF132 |
“4.2250 - ELEMENT, OIL FILTER ... 5573014 ELEMENT (AC TYPE PF-132 INCL. GASKET IN 4.2300)” — manufacturer, archive.org |
| Oil filter spin-on full-flow filter (engines with spin-on adaptor) |
Detroit Diesel 25010495 Also: AC Delco PF911 |
“4.2250 - ELEMENT, OIL FILTER ... 25010495 ... ELEMENT (SPIN-ON) (TYPE PF-9 1 1) [OCR]” — manufacturer, archive.org |
| Fuel filter secondary filter, spin-on (3/4 in. thread base) |
Detroit Diesel 23530707 Replaces 25010778 Also: AC Delco TP916 |
“25010778 Superceded by DN 23530707” — dealer, powerlinecomponents.com · “Detroit Diesel Secondary Fuel Filter - 23530707 - Series 60 Series 53 Series 71 Series 92 Series 149” — dealer, industrialtecsupply.com |
| Fuel filter secondary filter, shell type (8 in. paper element) |
Detroit Diesel 5574508 Also: AC Delco TP540X |
“2.3320 ... 5574508 ... ELEMENT (8" PAPER) (TP-540X)” — manufacturer, archive.org |
| Fuel pre-filter / separator primary fuel strainer, spin-on (1 in. thread base) |
Detroit Diesel 25010776 Also: AC Delco T915 |
“25010776 CARTRIDGE. FUEL STRAINER (SPIN ON) (T-915)” — manufacturer, archive.org |
| Fuel pre-filter / separator primary fuel strainer, shell type (8 in. sock element) |
Detroit Diesel 5575032 Also: AC Delco T552 |
“2.3010 - ELEMENT, FUEL STRAINER ... 5575032 ELEMENT (8" SOCK TYPE) (AC TYPE T-552)” — manufacturer, archive.org |
| Raw-water impeller raw-water pump 5122599 / 23507972 (3 1/2 in., spline drive), normal water temperature |
Detroit Diesel 8924839 | “5.6 230 - IMPELLER, RAW WATER PUMP 6A 8924839 IMPELLER (USE IN NORMAL WATER TEMP).” — manufacturer, archive.org · “Impeller for Detroit Diesel, Scania and Volvo Penta Marine Water Pumps 8924839 Impeller with 12 Blades and 12 Spline Dri” — dealer, dieselpro.com |
| Raw-water pump kit raw-water pump 5122599 / 23507972 (spline drive) |
Detroit Diesel 5197222 | “5.6025 - RECONDITIONING KIT, RAW WATER PUMP 5197222 RECONDITIONING KIT” — manufacturer, archive.org · “Detroit Diesel Marine Water Pump repair kit for 6-71, 8V71, 8V53, 12V71, 6V92, 8V92 5197222” — dealer, dieselpro.com |
| Raw-water impeller raw-water pump with 3 1/2 in. impeller and double-flat drive (6-screw cover) |
Detroit Diesel 8927570 | “5.6 230 - IMPELLER, RAW WATER PUMP ... 8927570 IMPELLER.” — manufacturer, archive.org |
| Zinc / anode electrode assembly, 2 1/8 in. (raw-water pump inlet and exchanger) |
Detroit Diesel 8517479 × 2 | “5.6575 - ELECTRODE, RAW WATER PUMP 8517479 ELECTRODE ASSY. (2 1/8" L. ELECT.) (5.5010)” — manufacturer, archive.org · “A-8517479 2 2 2 2 Electrode Assembly - 2 1/8" L At pump inlet & exchanger” — dealer, interstate-mcbee.com |
| Zinc / anode electrode assembly, 3 3/8 in. (heat exchanger) |
Detroit Diesel 8515850 × 2 | “5.5010 - ELECTRODE, HEAT EXCHANGER 8515850 ELECTRODE ASSY. (3 3/8" L ELECT.)” — manufacturer, archive.org · “A-8515850 2 2 2 2 Electrode Assembly - 3 3/8" L In exchanger” — dealer, interstate-mcbee.com |
| Thermostat 170 F, full-blocking (seal 5132155 separate) |
Detroit Diesel 23503826 × 2 | “5.2050 - THERMOSTAT ASSY. 23503826 THERMOSTAT (170 DEG OPENING TEMP.)” — manufacturer, archive.org · “Thermostat for Detroit Diesel 23503826 170 Degrees” — dealer, dieselpro.com |
| Thermostat 160 F, full-blocking (seal 5132155 separate) |
Detroit Diesel 5102112 × 2 | “5102112 THERMOSTAT (160 DEG. OPENING TEMP.)” — manufacturer, archive.org · “Detroit Diesel Thermostat for series 71 and 92 5102112 160 degrees” — dealer, dieselpro.com |
| Air filter air silencer element, 8.16 x 7 in. (engines with Detroit air silencers) |
Detroit Diesel 6422214 | “3.2002 - ELEMENT, AIR SILENCER 6422214 ELEMENT (8.1 6'X7' L.) [OCR]” — manufacturer, archive.org |
From the engine maker’s parts lists, or two independent parts dealers. Numbers change with serial number and get superseded — check yours before ordering.
Steering
Hynautic — K-series pressurized hydraulic steering (H-series helms, K-series cylinders) parts: obsolete
SeaStar bought Hynautic and kept making components and rebuild kits for years; after Dometic bought SeaStar, Hynautic pages and parts were removed from Dometic's site. Helms H-21 through H-52 and cylinders K-6 through K-31 are discontinued. Seatech Marine Products publishes SeaStar direct-replacement equivalents (e.g., H-50/H-52 replacement kits usable in the pressurized system with a non-vented fill plug) and offers rebuild services; independent hydraulic shops rebuild helms and cylinders for roughly $250–350 each. Kobelt/Accu-Steer also supply steering and power-assist equipment used on larger boats.
Parts sources: Seatech Marine Products (Hynautic alternatives & rebuilds), Kobelt (marine steering systems)
Common problems (3)
-
Helm pump shaft seal leaks steering
The upper helm shaft seal deteriorates from sun, salt and dirt and weeps oil; raising system pressure is only a stopgap, and the helm must be removed and resealed.samsmarine.com · trawlerforum.com · youtube.com
-
Cylinder rod seal leaks steering
Damaged wiper/rod seals let fluid out the end of K-6 type cylinders.facebook.com
-
Olive-type tubing fittings leak steering
Some owners dislike Hynautic's olive compression fittings on plastic tubing because they are prone to leaks.trawlerforum.com
Model sources (5)
hmy.com · curtisstokes.net · tampayachtsales.com · hatterasowners.com · hatterasowners.com
Own a Hatteras 48 Motor Yacht (1981-84)? Add her to your boats, then share a photo — names, numbers and faces are blurred before it appears.
Other Hatteras models
- Hatteras 37 Convertible 1977–1982
- Hatteras 40 Double Cabin 1987–1996
- Hatteras 43 Double Cabin 1971–1984
Researched from public sources. Spotted an error? The sources are listed above — tell us what they got wrong.