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CAMSHAFT IDENTIFICATION |
Camshaft Identification On
Subaru 1.6 & 1.8L Engines
The AERA Technical Committee offers the following information to assist technicians in camshaft identification and possible reuse limits on Subaru engines. Although the camshafts from different engines look similar, substitutions are not permitted.
Subaru has marked their camshafts with numbers for identification purposes. Refer to the chart for easy reference and reuse limits.
Cam & ID Lobe Lift Push Rod
Engine Lifter Type Mark (Int & Exh) Length
1.6L OHV Solid 51 1.2693-1.2732 8.620-8.624
1.8L OHV Solid 72 1.2693-1.2732 9.080-9.100
1.8L OHV Hydraulic 76 1.4134-1.4173 9.120-9.140
The wear limit for cam lobes on all camshafts is .059 (.15 mm) less than the listed specification. The maximum camshaft end play is .008 (.20 mm) and is controlled by a replaceable thrust plate.
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OIL LEAK ON 95 1.8 AND 2.2L ENGINES |
Engine Oil Leak On
1995 Subaru 1.8 & 2.2L Engines
The AERA Technical Committee offers the following information concerning an engine oil leak on 1995 Subaru 1.8 & 2.2L engines. Leaking oil has been reported between the engine oil pump housing and the cylinder block sealing surfaces.
The cause of this leak has been traced back to an inadequate size oil pump return hole. The return hole should be .235 (6 mm) in diameter. It is permissible to enlarge the hole size to the correct dimensions by using an appropriate size drill bit and drilling.
Applying grease to the end of the drill before drilling will minimize the chips created. Using the tool, carefully enlarge the hole to .235 (6mm). Then, clean out the hole for any extra shavings that may be left behind. Upon completion of
this procedure, carefully reinstall the oil pump.
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PISTON & RING COMBINATIONS |
Piston And Piston Ring Combinations On
Subaru 1.8L OHV & OHC Engines
Subaru uses two different oil ring groove designs on pistons installed in OHV and OHC (overhead valve & overhead camshaft) engines. Both designs lock the upper rail of the oil ring into the piston groove. Failure to install the upper rail of the oil ring correctly, may result in loss of oil control in those cylinders affected, as well as cylinder scoring and exhaust smoke.
The OHV engine uses a pin installed into the upper portion of the groove to lock the rail (Figure 1). Install the pistons into cylinders with the locking pin toward the centerline of the engine, or toward the camshaft.
Insert Figure 1 here
The OHC engine uses a notch cutout in the upper oil ring groove and relies on the assembling technician to bend over the pawl on the upper rail of the oil ring for correct installation. Install the pistons into the cylinders with the valve reliefs toward the oil pump.
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NOISY LIFTERS 1.8L OHV |
Noisy Lifters On
1980-89 Subaru 1.8L OHV Engines
The AERA Technical Committee offers the following information concerning noisy lifters on 1980-89 Subaru 1.8L OHV engines. This information is an addition to AERA Technical Bulletin TB-1058. The noise does not seem to be
affected by engine oil pressure changes. The cause of this condition should be considered on any engine that has not had the engine oil pump replaced.
The cause of this type of noise has been associated with aireated engine oil. The source of the aireated engine oil may be coming from a leak between the oil pump drive shaft and shaft seal. Over a period of time, this seal, Part
#806718090 may become hard and brittle and allow air to pass by. The seal is on the intake (suction) side of the oil pump and air leaking around the seal will be drawn into the intake cavity. As air is drawn into the intake cavity, it mixes with the engine oil, producing this aireated condition. Hydraulic lifters do not function properly with that type of pressurized oil supply.
If a disassembled oil pump is deemed reusable, it is imperative the seals listed below be replaced during the pump rebuilding process.
Oil Pump Seal Part Numbers
Drive Shaft Seal Body Seal Oval-O-Ring
806718090 806945020 15066AA000
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CYL HEAD SPECS ON 80-89 1.8L |
Cylinder Head Specifications On
1980-89 Subaru 1.8L Engines
The AERA Technical Committee offers the following information on cylinder head specifications for 1980-89 Subaru 1.8L engines. Subaru has offered two different 1.8L engines, an overhead valve (OHV) design and an overhead cam
engine (OHC). Cylinder head specifications for the two engines are unique to those different designs.
The cylinder heads do have similar appearances, however they can be identified by their casting numbers. The OHV casting number is EA-81 and the OHC cast number is EA-82. Those casting numbers also refer to the Subaru engine model designator. Refer to the specifications below while rebuilding cylinder heads for Subaru 1.8L engines.
Measurement OHC E82 Engine OHV E81 Engine
Total Head Height 3.565-3.567 3.576-3.581
Minimum Head Height 3.545 3.556
Installed Stem Height 1.843-1.862 1.752-1.772
Valve Stem Clearance .0014-.0026 .0014-.0026
Stem Dia. Intake .2736-.2742 .3130-.3136
Stem Dia. Exhaust .2734-.2740 .3128-.3134
Valve Seat Width .047-.071 .059-.079
Intake Valve Head Dia. 1.657 1.563 (1980-82)
1.630 (1983-89)
Exhaust Valve Head Dia. 1.398 1.362 (1980-82)
1.385 (1983-89)
Inner Spring F/Length 1.980 1.921 or 2.087*
Inner Test Pressures 20-23#'S@ 1.516 19-22#'S@ 1.476*
Outer Spring F/Length 1.996 1.783 or 1.909*
Outer Test Pressures 46-54#'S@ 1.630 33-38#'S@ 1.555*
*Engines with hydraulic lifters, inner spring test pressure is 20-23#'S @ 1.516, outer spring test pressure is 46-54#'S @ 1.630.
Technicians are reminded to replace either the valve seat or valve, or both if the installed stem height is greater than the values listed above.
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NEW CYLINDER LINER O-RINGS |
New Cylinder Liner O-Ring Seals On
Cummins NH/NT 6 Cylinder Engines
Cummins Engine Company has released new O-ring seals for the cylinder liners in NH/NT 6 cylinder engines. The new seals are made of an EP material and have a smaller diameter cross-section.
The new seal replaces both the old center seal #3008998 and the old lower seal #183049. The new seal carries Cummins part #3032874 and is black in color with one blue dot.
The new O-ring seals are not to be intermixed with the former seals on the same liner. Cylinder liner deformation will result. You can use the former seals and new seals in the same engine as long as they are used in the correct combinations on each liner. The illustration below shows the correct combinations.
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OIL IN COOLANT |
Oil in Cooling System on
VW 1.5L & 1.6L Diesel Engines
AERA members have reported instances of engine oil in the cooling system on VW 1.5L diesel engines. According to AERA sources, the problem is related to a crack in the cylinder head bolt hole located near the oil gallery feeding the cylinder head.
The oil feed gallery in the block is located on one side of the center head bolt hole and a coolant jacket is on the opposite side of the bolt hole. Pressurized engine oil is diverted through a slot in the head gasket and is feed up the side of the head bolt to the cylinder head. The oil also follows the bolt back down to the bottom of the bolt hole. Should the crack in the head bolt hole extend to the coolant jacket, oil can mix with engine coolant.
This problem is generally found on engines equipped with 11mm head bolt holes. Later design engines utilize 12mm head bolts and do not exhibit this defect. At the time of this writing no successful repair procedure is available.
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