Mercury MerCruiser MCM 454 Mag MPI Service Manual page 244

454 CID (7.4L) / 502 CID (8.2L)
Installation
DO NOT use sealer on head gaskets.
1. Place head gasket in position over dowel pins.
2. Carefully set cylinder head in place over dowel pins.
3. Coat threads of head bolts with Quicksilver Perfect Seal and install finger-tight.
4. To insure gasket sealing, torque head bolts in three steps, following torque sequence
for each step. Start first step at 30 lb-ft (40 Nm), second step at 59 lb-ft (80 Nm), and
finish with a final torque of 89 lb-ft (120 Nm) on "Short Bolts" and 92 lb-ft (125 Nm) on
"Long Bolts."
Cylinder Head Torque Sequence
5. Install push rods and rocker arm assemblies in their original positions. Coat threads on
rocker arm bolt with Perfect Seal. Torque to 40 lb-ft (54 Nm).
6. Install as outlined:
a. Intake manifold.
b. Rocker arm covers.
c. Exhaust manifolds.
d. Spark plugs.
e. Any components removed from front or rear of cylinder heads.
7. Follow procedures in SECTION 6A or 6B of this manual.
Seawater Cooled Models: Provide adequate water supply to seawater pickup (see
SECTION 6A).
Closed Cooled Models: Refill closed cooling section (see SECTION 6B), and provide
adequate water supply to seawater pickup.
Ensure that cooling water supply is available before starting the engine.
8. Start engine, set timing and check for leaks.
Index
Page 3A-40
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CAUTION
CAUTION
SERVICE MANUAL NUMBER 23
72944
90-861326--1 MARCH 1999