Cylinder Block; Cleaning; Inspection - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23
1. Installing intermediate and center bearings:
2. Installing front and rear bearings:
3. Install a new camshaft rear plug.
IMPORTANT: Plug must be installed flush to 1/32 in. (0.8 mm) deep and must be paral-
lel with rear surface of cylinder block.
4. Install crankshaft and camshaft as outlined.

Cylinder Block

Cleaning

1. Remove all engine components as previously outlined.
2. Wash cylinder block thoroughly in cleaning solvent and clean all gasket surfaces.
3. Remove oil gallery plugs and clean all oil passages.
4. Remove expansion plugs.
NOTE: These plugs may be removed with a sharp punch, or they may be drilled and pried
out.
5. Clean water passages in cylinder block.

Inspection

1. Inspect water passages in cylinder block.
2. Inspect cylinder block for cracks in cylinder walls, water jacket valve lifter bores and main
Index
90-861326--1 MARCH 1999
Downloaded from https://needmanual.com/
a. Install nut and thrust washer all the way onto puller screw, then position pilot in front
camshaft bearing bore and insert screw through pilot.
b. Index center camshaft bearing, then position appropriate size remover and installer
tool in bearing and thread puller screw into tool. Be sure at least 1/2 in. (13 mm) of
threads are engaged.
c. Using two wrenches, hold puller screw and turn nut until bearing has been pulled into
position. Remove the remover and installer tool and check to ensure that oil hole(s)
in bearing are positioned correctly.
d. Install intermediate bearings in same manner being sure to index bearings correctly.
It will be necessary to position pilot in rear camshaft bearing bore to install rear inter-
mediate bearing.
a. Install appropriate size remover and installer tool on drive handle.
b. Index front bearing (as explained in "Important" above), and drive it into position with
tool. Check position of oil hole(s) in bearing to ensure bearing is positioned correctly.
c. Install rear bearing in same manner, being sure to index bearing correctly.
bearing webs.
454 CID (7.4L) / 502 CID (8.2L)
Page 3A-81