Mercury MerCruiser MCM 454 Mag MPI Service Manual page 279

SERVICE MANUAL NUMBER 23
Installation
1. If a new crankshaft is being installed, proceed as follows:
IMPORTANT: Be sure that all bearings and crankshaft journals are clean.
2. Install main bearings in engine block as follows.
3. Carefully lower crankshaft into place. Be careful not to damage bearing surface.
4. Check clearance of each main bearing, following procedure outlined under "Main Bear-
5. Install main bearing caps. Refer to "Main Bearings" for proper torque procedure.
6. Check crankshaft end play as outlined.
7. Check clearance for each connecting rod bearing, following procedure under "Connect-
8. Install rod caps and evenly torque nuts. Refer to "Specifications".
9. Turn crankshaft so mark on timing sprocket or gear is facing camshaft.
10. Install as outlined:
11. Install new oil filter. Fill crankcase with oil.
Index
90-861326--1 MARCH 1999
Downloaded from https://needmanual.com/
a. Remove timing sprocket or gear from old crankshaft and reinstall on new crankshaft
as outlined.
b. On models with drive shaft extension, if old pilot bushing is to be reused, bushing
can be removed without damage by filling pilot bushing cavity with grease, then
inserting an old transmission input shaft in bore of bushing and hitting it with a
hammer. This will create hydraulic pressure in pilot bushing cavity which should
force bushing out.
Main Bearing Inserts
a - Lower Bearing Insert (Install In Cap)
b - Upper Bearing Insert (Install In Block)
c - Oil Groove
ings." If bearing clearances are satisfactory, apply engine oil to journals and bearings.
ing Rod Bearings." If bearing clearances are satisfactory, apply engine oil to journals and
bearings.
a. Timing chain and sprocket or gear on camshaft -align marks with crankshaft.
b. Timing chain/gear cover.
c. Oil pump and baffle.
d. Dipstick tube and oil pan.
e. Spark plugs.
f. Torsional damper and crankshaft pulley.
g. Water pump.
h. Belt.
i. Flywheel and drive coupler/plate.
j. Flywheel housing.
k. Starter.
a
b
454 CID (7.4L) / 502 CID (8.2L)
c
Page 3A-75
72359