| VALVE LASH SPECIFICATIONS |
Valve Lash Specifications On
Chrysler (AMC Renault) 1.7 & 2.0L (105 & 122 CID) Engines
The Chrysler (AMC Renault) 1.7 & 2.0L (105 & 122 CID) engines use
a puck with a replaceable pad to adjust the valve lash. With the
engine cold, the recommended valve lash for the intake valves is
.008 (.20mm) and .015 (.40mm) for the exhaust valves (Figure
1).
Setting the valve lash requires mounting the camshaft and
camshaft caps to the cylinder head. Using the sequence outlined
in the illustration (Figure 2), torque bolts #11 & 12 (6mm
diameter) to 7 lbs.ft. and the remaining bolts (8mm diameter) to
15 lbs.ft. Apply a small amount of RTV sealer on the parting
face of each end camshaft bearing cap before installation. This
will guard against external oil leaks.
For additional information see AERA Technical Bulletins: TB 654,
395 & SB 36
The AERA Technical Committee
March 1991 - TB 747
##END## |
| OIL FILTER REPLACEMENT CAUTION ON AMC 4.2L ENGINES |
Oil Filter Replacement Caution on
Chrysler (AMC) 4.2L (258 CID) Engines
Chrysler Corporation cautions on the replacement of oil filters on 4.2L (258 CID) AMC built engines.
Engines built prior to 1987 utilize an oil filter without internal bypass architecture. A bypass valve is necessary to provide adequate lubrication to the engine should the oil filter become clogged. Engines using this style filter have a bypass valve assembly built into the cylinder block (see illustration).
This earlier filter design features a .813 connector thread.
Engines built during and after 1987 do not have the built-in bypass assembly and therefore utilize a filter assembly containing the bypass valve. The later model filter design features a 20mm (.787) connector thread.
Do not use the earlier style filter on engines built during and after the 1987 model year. Incorrect filter application may result in serious engine damage.
The AERA Technical Committee |
| OIL FILTER ADAPTOR LEAKS ON GM 2.8L ENGINES |
Oil Filter Adaptor Leaks On
2.8L (173 CID) Chrysler (AMC) Engines
Chrysler (AMC) has reported that close inspection of oil leaks
around the oil filter must be made to determine the exact source
of the leak. Possible causes of the leak are the oil filter
itself, a loose oil filter adaptor retaining bolt or a warped oil
filter adaptor base. The following steps should be followed to
correct this problem:
1. After removing the oil filter, remove the oil filter
adaptor (A) and gasket by removing the retaining bolt (B).
See Figure 1.
2. Clean oil residue from the cylinder block and oil filter
adaptor mating surfaces.
3. Check the adaptor mating surface for warpage (see Figure
2). Replace the adaptor if warpage exceeds .008 (.2mm)
with AMC part #8983 500 836.
4. Install the adaptor on the cylinder block using AMC
gasket #8983 500 839 or equivalent and retaining bolt seal
#8983 500 838 or equivalent. Tighten the retaining bolt to
30-40 ft. lbs. (40-60 N·m).
(Insert 2 Illustrations)
The AERA Technical Committee
March 1987 - SB 141
##END## |
| OIL LEAKS ON 1984-86 GM 2.8L ENGINES USED IN AMC |
Oil Leaks On
1984-86 Chrysler (AMC) 2.8L (173 CID) Engines Used In Jeep
Applications
Chrysler (AMC) says there are three possible oil leak locations
on its 2.8L (173 CID) engines: the valve covers, intake manifold
and rear cradle area of the oil pan.
Replace leaking valve cover gaskets with AMC part #8983 503 179
or aftermarket equivalent. The seam where the intake manifold
and cylinder head mate must have a small amount of RTV sealer
applied to eliminate gaps or steps that will allow leaks. Gasket
over-crush is prevented by metal pins located on the side of each
bolt hole.
Intake manifolds usually leak at the rear manifold-to-block
mating surface. After removing the manifold and thoroughly
cleaning it, use a 3/16 (4.7mm) diameter spherical cutter
(Figure 1) to cut a 3/16 (4.7mm) wide groove that's 1/16
(3.1mm) to 1/8 (1.5mm) deep.
(Insert Illustration)
Fill the groove with RTV sealer when reinstalling the manifold
(Figure 2).
(Insert Illustration)
For 1984 engines, Chrysler (AMC) supplies an oil pan gasket kit
AMC part #8983 500 853 (or use an aftermarket equivalent), which
should be installed in place of the RTV sealer used at the
factory. It is important, however, to seal the rear cradle
corners with RTV sealant.
1985-86 engines should be closely inspected for deformed oil pans
(Figure 3). Replace deformed oil pans with AMC part #8953 001
840. Engines built after January 21, 1986 should not have
deformed oil pans.
(Insert Illustration)
The new, recommended method is to remove the stand-offs on the
oil pan rails (Figure 4) with a file or small hand-grinder. Use
AMC oil pan gasket kit #8983 500 853 or aftermarket equivalent.
(Insert Illustration)
The rear cradle seal is installed in the groove in the main cap
and a small amount of RTV is applied to the corners of the seal
where it contacts the block. Please note that once the stands
have been removed, RTV can no longer be used in place of the
gasket.
The AERA Technical Committee
August 1986 - SB 134
##END## |
| EXHAUST VALVE BURNING IN 1972 AMC V8 ENGINES |
Exhaust Valve Burning On
1972 Chrysler (AMC) V-8 Engines
It has been reported that problems with exhaust valve burning have been encountered on Chrysler (AMC) V-8 engines equipped with model 2100 2V carburetors. This problem can be attributed to a lean air/fuel mixture caused by vacuum leaks at the carburetor adaptor gaskets.
It is recommended that, when performing valve work on these engines, the condition of the adaptor gaskets be checked. A defective adaptor gasket could cause a repeat valve failure within a very short time.
The AERA Technical Committee |
| REVISED VALVE SPRING ASSM. ON AMC 2.46L ENGINES |
Revised Valve Spring Assembly On
1988 Chrysler (AMC) 2.5L (151 CID) Engines
Chrysler (AMC) advises that a new valve spring assembly is being used on 1988 Chrysler (AMC) 2.5L (151 CID) engines.
The revised valve spring assembly features a new spring, retainer and valve locks (keepers). The spring is slightly tapered, increasing in diameter from top to bottom (see Figure 1, points A to B). AERA members should note that two spring coils at the bottom of the spring are flush to further aid in differentiating
the new design from the former design.
At this time Chrysler (AMC) does not recommend substituting the revised valve spring assembly for the former assembly on pre-1988 model cylinder heads.
The AERA Technical Committee |
| REVISED INTAKE/EXHAUST MANIFOLD GSKT ON 4.0L ENG. |
Revised Intake/Exhaust Manifold Gasket On
Chrysler (AMC/Jeep) 4.0L (242 CID) Engines
The Chrysler (AMC/Jeep) Corporation has introduced a new intake/exhaust manifold gasket for its 4.0L (242 CID) engines.
The illustrations below show bolt and hole locations.
The revised combination intake and exhaust manifold gasket, AMC #8983505213 or aftermarket equivalent, provides increased sealing capabilities and is the only gasket supplied for service.
Revised torque values have been established for the new gasket.
The initial torque settings are:
Component Current Former
Exhaust Manifold Ctr. Bolt 30 ft.lbs. (41Nm) 23 ft.lbs.
(31Nm)
All Other Manifold Bolts 23 ft.lbs. (31Nm) 23 ft.lbs.
(31Nm)
EGR Tube Nuts 30 ft.lbs. (41Nm) 30 ft.lbs.
(41Nm)
The service recheck torque settings are:
Component Current Former
Exhaust Manifold Ctr. Bolt 25-35 ft.lbs. 18-28 ft lbs
(34-37Nm) (24-38Nm)
All Other Manifolds Bolts 20-26 ft.lbs. 18-28 ft lbs
(27-35Nm) (24-38Nm)
EGR Tube Nuts 25-35 ft.lbs. 25-35 ft.lbs.
(34-47Nm) (34-47Nm)
The AERA Technical Committee |
| DISENGAGED PUSHRODS ON AMC 4.2L ENGINES |
Pushrod Problems On
1981-82 Chrysler (AMC & Jeep) 4.2L (258 CID) 6 Cyl. Engines
Pushrods in some 1981-82 Chrysler (AMC & Jeep) 4.2L (258 CID) 6 cyl. engines built prior to May, 1982, may disengage from the rocker arms causing noise, backfire or a miss.
To correct this problem, install a complete set of .070 longer replacement pushrods if any of the original parts become disengaged or bent.
The original pushrods are 9.640 to 9.660 long. (Part No.3227329)
Replacement pushrods are 9.710 to 9.730 long. (Part No.3242395)
NOTE: The original shorter pushrods (Part No. 3227329) are stillrecommended for use in 1980 and prior Chrysler (AMC & Jeep) 4.2L (258 CID) engines.
The AERA Technical Committee |
| KNOCKING NOISE |
Engine Knock On
1980-81 Chrysler (AMC) 4 Cylinder Engines
An engine knock may persist in some 1980-81 Chrysler (AMC) 4 cylinder engines even after carbon deposits have been removed with a combustion chamber cleaner.
AMC reports that the cure is to install a thicker cylinder head gasket and a shim between each rocker arm ball and retaining nut on the 1980 engines.
For the 1981 model engines, install a thicker head gasket and replace the original push rods with the longer 4 cylinder 1982 push rods.
The installation of rocker arm ball shims on the 1980 engines or longer push rods on the 1981 engines are required to compensate for the increased thickness of the replacement cylinder head gaskets.
The AERA Technical Committee |
| VALVE NOISE & MAIN BEARING TORQUE SPECS. ON 6 CYL. |
1981 Chrysler (American Motors)
6 Cylinder Engines Valve Noise
Some 1981 Chrysler (AMC) 6 cylinder engines built prior to engine code 008C01, may develop valve train noise caused by contact between the rocker arms and valve spring retainers.
Correction involves measuring valve tip projection above the spring retainer and replacing retainers and locks if valve tip projection is not within specifications.
If any valve tip projects less than .010 above the retainer, the original retainer and locks must be replaced with valve spring retainer No. 3237482 and retainer locks No. 3180458.
Main Bearing Capscrew Torque Revised
The 1981 AMC 6 cylinder main bearing capscrew torque specifications has been revised as follows:
Foot Pounds Metric (N·m)
Torque Set Retorque Torque Set Retorque
by Mfgr. Spec. by Mfgr. Spec.
65 65-70 88 88-95
The AERA Technical Committee |
