|
KNOCKING SOUND -- COLT 2000CC ENGINE |
Knocking Sound On
1974-75 Chrysler (Dodge Colt) 2.0L Engines
1974-75 Chrysler (Dodge Colt) 2.0L engines may develop a low grade knocking noise when the engine is started after a long period of nonuse. The manufacturer reports the noise is caused by slack in the timing chain damper. The knocking sound, however, disappears as the engine reaches normal operating temperature in most cases.
A new and 3mm longer timing chain damper tensioner (Part Number MD-021227) is currently available form Chrysler. See diagram.
Caution: Members are cautioned against shimming the damper tensioner. Shimming may lead to possible engine damage.
The AERA Technical Committee |
|
REVISED CYLINDER HEAD & ROCKER ARMS ON 1.6L ENGINE |
Revised Cylinder Head & Rocker Arms On
1987 Chrysler 1.6L (98 CID) Engines
The Chrysler Corporation has informed AERA that the late 1987
1.6L (98 CID) engines used in the Dodge Colt are now using a
revised cylinder head and rocker arms.
Engines carrying the number FK9798 and later utilize the
following part numbers: cylinder head #MD125062, intake rocker
arm #MD125217 and exhaust rocker arm #125218. The new rocker arms
may only be used in conjunction with the new cylinder head and
they do not interchange with any earlier components. Furthermore,
do not mix the new and former rocker arms on the same rocker
assembly or use the new rocker arms on the former cylinder head.
The revised components are assembled according to the
illustration below. The wave washers on the current rocker
assembly are positioned in front of the rocker arm, facing the
front of the engine.
(insert illustrations)
The AERA Technical Committee
November 1987 - TB 466
##END## |
|
CYLINDER HEAD TORQUE PROCEDURE |
Cylinder Head Torque Procedure On
Dodge Colt Engines
The cylinder head bolts on all Dodge Colt engines should be torqued every 12 months or 12,000 miles and at each time the cylinder head is removed and reinstalled.
The cylinder head bolts must be torqued when the engine is cold.
The following torque recommendations should be followed:
1600 cc. Engine 51 to 54 ft. lbs.
2000 cc. Engine 65 to 72 ft. lbs.
The AERA Technical Committee |
|
REVISED VALVE SPRING ON 1989 DOHC ENGINES |
Revised Valve Springs on
1989 Chrysler 1.6L DOHC Engines
Chrysler has released a revised valve spring for 1989 1.6L DOHC
(double overhead camshaft) engines used in the Eagle Summit and
Dodge Colt.
The new spring has been incorporated in all engines with the
build code HB1118 or later. The new spring should only be used
on earlier produced engines if all 16 valve springs are replaced.
Spring replacement is advocated when the free length is less than
1.768 (44.9mm) or it is out of square by more than 4o.
Spring specifications:
Old New
Free length 1.803 (45.8mm) 1.902 (48.3mm)
Load at (40mm) 52.8lbs (24kg) 66lbs (30kg)
Color Yellow Blue
Part number MD121086 MD139243
The AERA Technical Committee
February 1990 - TB 623
##END## |
|
REVISED CRANKSHAFT ASSEMBLY ON MITSUBISHI ENGINES |
Revised Crankshaft on
Chrysler 1.5L Engines
Chrysler Corporation has revised the crankshaft in 1989 1.5L engines produced after January 1, 1989 and used in Dodge Colt vehicles.
The new crankshaft features an undercut fillet radius on both rod and main bearing journals making it easy to identify. According to Chrysler, this new crankshaft cannot be remanufactured and Chrysler is therefore not making undersize bearings available for it.
At some point in the future Chrysler may make it possible to grind this crankshaft and undersize bearings may then be made available.
The AERA Technical Committee |
|
VALVE STEM SEAL INSTALLATION |
Caution On Installing Valve Stem Seals On
Chrysler, Dodge, Plymouth 5.2, 5.5, 5.8, 6.6 & 7.2L Engines
When installing intake valve stem seals in the subject engines, often the seals are crushed if the valve springs are excessively compressed during installation of valve keepers. Using the valve stem as a guide, the intake valve stem seals should be pressed firmly and squarely over the valve guides.
CAUTION: When installing valve retainer locks, compress the springs just enough to complete the operation. Do not force the seals against the top of the guides.
The AERA Technical Committee |
|
SPARK KNOCK (DETONATION) |
Reducing Spark Knock (Detonation)
Chrysler Corporation has authorized a field fix for the purpose of reducing the possibility of spark knock (detonation) on 1979 passenger cars equipped with Federal 3.7L (225 CID) engines, 2BBL carburetor and automatic transmissions; and 1979 passenger cars and light-duty trucks equipped with 5.9L (360 CID) engines, 4BBL carburetor, California Emission Package and automatic
transmissions.
The recommendation is to change the timing as follows:
Passenger cars with Federal 3.7L (225 CID) engines -- From 12° to 8° BTDC
Passenger cars with 5.9L (360 CID) engines -- From 16° to 12° ± 2°
Light-duty trucks with 5.9L (360 CID) engines -- From 10° to 6° BTDC
After resetting the timing; idle set speed, propane idle speed, and hot fat idle speed should be checked and reset, if necessary, to conform to the specification on the vehicle emission label.
NOTE: It is mandatory that a new emission label be applied over the existing lain the engine compartment. Labels are available from your local Chrysler and Dodge dealers.
The AERA Technical Committee |
|
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.
The AERA Technical Committee |
|
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.
The AERA Technical Committee |
