Engine - Running Production Changes
NO.: 09-09-93GROUP: Engine
DATE: Jun. 4, 1993
SUBJECT:
Engine - Late Model Year Running Changes
NOTE:
THIS BULLETIN APPLIES TO 2.0L DOHC TURBO AND NON-TURBO ENGINES.
MODELS:
1992 (BD) Laser/Talon
DISCUSSION:
A number of changes were made to the 2.0L engine used in the subject models in May 1992. The Vehicles built after VIN xxxxxxxxNE005602 have these changes incorporated. Details on any revised repair procedures relating to these changes are listed in the 1993 Engine, Chassis & Body Service Manual (Publication No. 81-270-3500) and should be referred to when doing any repairs to vehicles with these changes.
The changes include the following:
CYLINDER BLOCK
1. The number of transmission/engine attaching bolts increased from 4 bolts to 5.
2. New main bearing cap bolts, tightening method and use of plastic gauge to fit bearings.
3. Width of the crankshaft bearing journal decreased.
PISTON AND PISTON RING
1. Height and width of piston in the pin area decreased.
2. Length of piston pin decreased from 72 mm to 62 mm.
3. Diameter of piston pin increased from 21 mm to 22 mm.
CONNECTING ROD
1. Web thickness of connecting rod decreased.
2. Connecting rod bearing cap bolts changed from M9 to M8.
3. New procedure for fitting bearings using plastic gauge incorporated.
CRANKSHAFT
1. Crankshaft bearing journal and connecting rod bearing journal width decreased.
2. Crankshaft web thickness increased.
3. Oil clearance for bearing journals reduced.
4. The number of flywheel to drive plate attaching bolts increased from 6 to 7 bolts.
ENGINE MOUNT
1. The roll stopper bracket was moved from the engine to the transmission.
NEW TYPE ATTACHING BOLTS
Areas and repair procedures affected are:
1. Cylinder head bolt and tightening procedure.
2. Main bearing cap bolts and tightening procedure.
3. Connecting rod cap bolts and rod bearing selection.
4. Crankshaft bearing selection and installation procedure.
CONNECTING ROD BEARINGS SELECTION
(1) When the bearings are to be replaced, select appropriate bearings for assembly according to identification colors for the crankshaft.
CRANKSHAFT BEARING SELECTION
(1) When the bearing is to be replaced, select the appropriate bearing for assembly according to the identification color for the crankshaft and the identification mark stamped on the cylinder block.
(2) Install the bearings having an oil groove to the cylinder block.
(3) Install the bearings having no oil groove to the bearing caps.
(4) Install the thrust bearings at the No. 3 upper bearing with the grooved side toward the crank web.
POLICY: Information only.