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Ericson 27

Built 1971–1978 by Ericson Yachts

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About the Ericson 27

Researched from public sources for this model. Any individual boat may have been modified or repowered — confirm before relying on any figure.

Illustration of a Ericson 27
Illustration, not a photo of this model. AI-generated illustration of a typical small cruising sloop.
Built
1971–1978
Builder
Ericson Yachts
Designer
Bruce King
Length
26.75 ft
Waterline
20.5 ft
Beam
9 ft
Draft
3.92 ft
Displacement
6,600 lb
Ballast
2,900 lb
Hull / keel
fin keel
Rig
sloop
Propulsion
inboard
Number built
1,250
Stern thruster
not fitted
Steering
varies by year · Edson
Tank capacities — where the figures come from
  • Fuel unknown
    The only figures come from owners on an Atomic 4 engine forum, who quote 15, 15.6 and 17 gal for original tanks. The Practical Sailor and Sailing Magazine reviews give no tank figures.
  • Water unknown
    Practical Sailor suggests increasing water tankage as an upgrade but gives no figure.

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
    No source mentions a thruster on this 27-footer.
  • Stern thruster not fitted
    Our earlier figure of none has no source, and nothing was found either way.
  • Steering varies by year · Edson
    “Typically the 27 was sold with tiller steering” — review (1971-1974), practical-sailor.com · “wheel steering (standard beginning with hull #754)” — review, practical-sailor.com · “Steering Data Sheet S-399 ERICSON 27 ... CLASSIC PEDESTAL STEERER ... CHAIN & WIRE ROPE KIT W/HARDWARE ... RADIAL DRIVE” — spec database, edsonmarine.com · “an Edson Steering pedestal (bridge deck-short) or a rudder off of a 1976 E27” — owners' association (1976), ericsonyachts.org
    Early boats had a tiller; the late-1974 upgrade added a pedestal wheel aft, standard from hull #754. Edson's data sheet for the Ericson 27 shows an Edson pedestal with chain and wire to a radial drive wheel, and an owners' association post describes an Edson pedestal on a 1976 boat.

Thrusters and steering are often replaced — check the units on your boat before ordering parts.

Early boats were sold stripped with an outboard in a transom cutout (outboard boats carry extra inside ballast); about 80% got an inboard, usually the Atomic 4, with a Yanmar diesel standard in the final year. A late-1974 upgrade brought teak interior, redesigned deck/cockpit and more standard gear; post-1974 boats are preferred. A few tall-rig boats exist. Balsa-cored deck over solid hull.

Engines fitted

Boats of the same model can differ — check which engines yours actually has before ordering parts.

Manuals and brochures online

Hosted by the builder or an owners' association; they own the copyright.

Known problems for this model

1 more
  • Poor ventilation interior
    Ventilation below is weak, especially on pre-1975 boats without the midships hatch; many owners have added vents or hatches.
    practical-sailor.com

Engines & parts

Universal Atomic 4 parts: good

Factory standard engine — you entered “Atomic 4 (Universal)”

Tens of thousands were built (sources say from 40,000 to 50,000). Despite being out of production for decades, the engine is well supported: Moyer Marine sells parts, rebuilt engines, fuel pump rebuilds and exhaust parts, and hosts an owners' forum; Old Lyme Marina and others also supply parts, and electronic ignition upgrades are available.

Parts sources: Moyer Marine

Common problems (3)
  • Raw-water cooling scale and corrosion cooling
    Most Atomic 4s are raw-water cooled, so the block scales up and corrodes, especially in salt water; cranking without starting can also flood the engine with seawater through the exhaust.
    goodoldboat.com · moyermarineforum.com · keelindex.com
  • Gasoline vapor fire/explosion risk fuel
    Gasoline vapor is heavier than air and settles in the bilge, so ventilation, blower use and shutting the fuel valve (a stuck carburetor float can overflow) matter.
    goodoldboat.com
  • Ignition and fuel system faults electrical
    Points, condenser, cap and wires, plus gummed carburetors and contaminated fuel, are the most common reasons an Atomic 4 won't run well.
    keelindex.com · goodoldboat.com
Maker’s service schedule (9)
Engine oil & filter change50 hrs
“3. FIFTY HOUR CHECK a. Using sump pump, remove all oil from crankcase. Refill with a good grade oil as specified in Tabl” — manufacturer, westerbeke.com
Fuel filters & water separator50 hrs
“e. Clean fuel pump strainer.” — manufacturer, westerbeke.com
Heat exchanger & oil cooler cleaning50 hrs
“b. Inspect oil cooler and remove any accumulation of grit or dirt.” — manufacturer, westerbeke.com
Clean flame arrestor100 hrs
“b. Inspect flame arrestor to be sure air passages are clean and free from oil. If dirty remove and wash with kerosene.” — manufacturer, westerbeke.com
Check clutch (reverse gear) adjustment100 hrs
“4. ONE HUNDRED HOUR CHECK ... c. Check adjustment of clutch.” — manufacturer, westerbeke.com
Valve clearance check / adjust150 hrs or 1 yr
“5. ONE HUNDRED FIFTY HOUR CHECK a. Check valve tappet adjustment.” — manufacturer, westerbeke.com
Spark plugs inspect / replace150 hrs
“b. Remove, clean, and reset spark plugs.” — manufacturer, westerbeke.com
Transmission fluid change
Universal V-drive unit (V-drive installations only; the standard reverse gear shares engine oil)
500 hrs
“(2) After the first 50 hours of operation, drain unit and refill ... (3) Change lubricant every 500 hours of operation.” — manufacturer, westerbeke.com
Complete overhaul3,000 hrs
“At the end of three thousand hours of operation the engine should be completely overhauled.” — manufacturer, westerbeke.com
Service part numbers (8)
Oil filter
optional add-on oil filter (not standard equipment)
Universal 276236
“2 Element or Cartridge 1 276236 (Oil Group, Oil Filter, Not Standard Equipment)” — manufacturer, westerbeke.com
Raw-water impeller
Oberdorfer N202M-03 / N202M-07 replacement raw-water pump (Universal pump 295625)
Oberdorfer 6593
“5 Impeller 6593 6593 6593 6593 6593 1 (N202M, N202M-03, N202M-07 parts list)” — manufacturer, pumpsandpartsonline.com · “Impeller : Catalog # 6593, Impeller” — dealer, pumpagents.com
Raw-water pump kit
Oberdorfer N202M-03 / N202M-07 raw-water pump
Oberdorfer 10725
“REPAIR KIT N202M N202M-03 N202M-07 10725” — manufacturer, pumpsandpartsonline.com · “Catalog # 10725, Repair Kit, includes O-Ring, Snap Ring, Impeller, 2 x Lip Seal” — dealer, pumpagents.com
Drive belt
alternator belt (Prestolite and Motorola alternators)
Universal 239387
“19 Belt 1 239387 (12 Volt - Motorola 51 Amp Alternator)” — manufacturer, westerbeke.com
Spark plug Universal 273276 × 4
“8 Spark plugs, champion 4 273276” — manufacturer, westerbeke.com
Thermostat
late style, from 1967 / serial #79476 (Holley 145 F, on cylinder head)
Universal 200206
“12 Thermostat Kit 1 200206 consists of 262278 and 261601” — manufacturer, westerbeke.com
Thermostat
Dole type, before serial #79476 (on manifold)
Universal 200207
“13 Kit, Thermostat (consists of 275965 & 261144) 1 200207” — manufacturer, westerbeke.com
Zinc / anode
fresh-water-cooled engines only (Universal heat-exchanger kit)
Universal 299760
“23 zinc pencil 1 299760 (Cooling, Fresh Water System, after serial #79476)” — manufacturer, westerbeke.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.

Sources disagree on first year, last year, number built — left blank rather than guessed.

Yanmar 2GM / 2GM20F parts: good

Factory common repower engine — you entered “Yanmar 2GM20F”

Well supported by Yanmar dealers and aftermarket; stainless mixing elbows that replace the OEM part numbers are widely sold.

Parts sources: Mack Boring & Parts (Yanmar distributor), HDI Marine (stainless exhaust elbows), Parts4Engines

Common problems (2)
  • Nearly blocked mixing elbow exhaust
    Owners find the exhaust port of the mixing elbow almost completely blocked while the engine still runs; a failed U-elbow has also let water into a cylinder and cracked a piston.
    sailnet.com · practical-sailor.com
  • Noise and vibration from soft mounts engine
    Worn soft engine mounts are a common cause of the vibration owners complain about; better aftermarket mounts are available.
    practical-sailor.com
Maker’s service schedule (2)
Fuel filters & water separator250 hrs
“The normal replacement interval for the element is 250 hours ... Filter cleaning First time 50 hours Filter element repl” — manufacturer, c320.org
Air filter / intake silencer250 hrs
“Washing period Every 250 hours” — manufacturer, c320.org
Service part numbers (10)
Oil filter Yanmar 119305-35170
Replaces 119305-35151, 119660-35150
“2GM20F Basic Service Kit ... 119305-35170 FILTER ASSY, D68XL65” — dealer, oldportmarine.com · “Suitable for: ... Yanmar 2GM, Yanmar 2GMF, Yanmar 2GM20, Yanmar 2GM20-YEU, Yanmar 2GM20F” — dealer, marinepartsystem.com
Fuel filter Yanmar 104500-55710
“Fuel Filter Element 1 104500-55710 / Fuel Filter O-Ring 1 24341-000440” — dealer, ellebogen.com · “2GM20F Basic Service Kit ... 104500-55710 ELEMENT, FUEL FILTER” — dealer, oldportmarine.com
Raw-water impeller
Japan-built 2GM / 2GM20(F) (serial not starting with E)
Yanmar 124223-42092
“Impeller 1 124223-42092 / Impeller Gasket 1 124223-42110” — dealer, ellebogen.com · “2GM20F Basic Service Kit ... 124223-42092 IMPELLER, PUMP” — dealer, oldportmarine.com
Raw-water impeller
European-built GM-YEU (serial starting with E)
Yanmar 128990-42570
Replaces 128990-42200
“Impeller & O-ring Kit-128990-42570 For the GM series engines with serial numbers beginning with an E” — dealer, oldportmarine.com · “(Supersedes part number: 128990-42200) ... GM-YEU series engines:(Serial number begins with an E)2GM20-YEU” — dealer, palmerpower.com
Drive belt Yanmar 25132-003700
“Alternator Belt 1 25132-003700” — dealer, ellebogen.com · “2GM20F Basic Service Kit ... 25132-003700 V-BELT, A37” — dealer, oldportmarine.com
Drive belt Yanmar 104511-78780
“S/W Pump Belt 1 104511-78780” — dealer, ellebogen.com · “2GM20F Basic Service Kit ... 104511-78780 V-BELT, M/19” — dealer, oldportmarine.com
Air filter Yanmar 128270-12540
“Air Filter Element 1 128270-12540” — dealer, ellebogen.com · “2GM20F Basic Service Kit ... 128270-12540 ELEMENT, AIR CLEANER” — dealer, oldportmarine.com
Zinc / anode
raw-water 2GM / 2GM20; also sold for the F (heat-exchanger) versions
Yanmar 27210-200300
“27210-200300 Yanmar Engine Zinc Anode For 2GM(D), 3GM(D), 2GM20, 3GM30” — dealer, zincsforboats.com · “It fits Yanmar 2GM, 2GM20F, 2GM15, 2GM20, 3GM30F, 3GMF, 3HMF, 3GM30H engines.” — dealer, deltadieselparts.com
Thermostat
2GM20F / 2GMF (fresh-water cooled)
Yanmar 121750-49800
“Thermostat 1 121750-49800 / Thermostat Gasket 1 129350-49541” — dealer, ellebogen.com · “Thermostat for Yanmar 2GMF, 3GMF, 3HMF, 2GM20F, 3GM30F, 3HM35F / REC121750-49800” — dealer, marineparts.eu
Thermostat
2GM / 2GM20 (raw-water cooled)
Yanmar 105582-49200
“Replaces Yanmar Marine 105582-49200 ... 1GM, 2GM, 3GM, 1GM10, 2GM20, 3GM30” — dealer, repowermarine.com · “1GM10, 2GM20 & 3GM30 Thermostat to fit raw water cooled engine versions ... equivalent to 105582-49200” — dealer, parts4engines.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.

Steering

Edson — Pedestal chain-and-wire steering parts: good

Edson (New Bedford, MA) still sells service parts: chain-and-wire kits, sprockets, idlers, pull-pull conduit steering and internal pedestal parts, and keeps steering data sheets by boat model, many decades old.

Parts sources: Edson Marine (service parts)

Common problems (3)
  • Old or slack steering wire steering
    Edson advises replacing steering wire about every five years, checking tension with the wheel locked, and inspecting under load annually; owners often find decades-old stiff wire.
    usna.edu · youtube.com
  • Lubrication and fastener checks steering
    Chain, wire, sheaves and pedestal bearings need regular oiling or greasing, and clevis/cotter pins and bolts should be checked monthly to avoid failures.
    usna.edu
  • Replacing engine control cables in the pedestal steering
    Swapping throttle/shift cables inside an Edson pedestal is a common owner job requiring removal of the wheel shaft sprocket pin.
    forums.sailboatowners.com

Edson — Traditional geared steerers (worm / rack-and-pinion) parts: good

Edson says its traditional wheels and geared steerers are still available, now built with modern materials; rack-and-pinion steerers are offered for transom-hung and inboard rudders.

Parts sources: Edson Marine (traditional steerers)

Model sources (9)

sailboatdata.com · practical-sailor.com · sailingmagazine.net · sailingtexas.com · ericsonyachts.org · sailboatlistings.com · latitude38.com · edsonmarine.com · ericsonyachts.org

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Other Ericson models

Researched from public sources. Spotted an error? The sources are listed above — tell us what they got wrong.