Repair - Mercury MerCruiser Service Manual

2. Measure the valve spring for squareness.
3. Replace the valve spring if not square.
4. Use a spring compressor to measure the valve spring tension. Replace the spring if the measured value is less than the
specified limit.
Description
Valve spring compressor
Description
Pressure

Repair

Valve Reconditioning
1. Recondition the valve face to the proper angle if the valve face is pitted or worn.
2. Measure the valve margin. If the valve margin is less than the specified amount after reconditioning, replace the valve.
90-8M0099748 eng DECEMBER 2015
a - Valve spring compressor
b - Torque wrench
b
a
19464
Valve closed
Valve open
Engine Inspection and Assembly
33344
6.2 Liter (377 cid)
350 N (78.68 lb) at 46.19 mm (1.818 in.)
1084 N (243.69 lb) at 32.3 mm (1.2717 in.)
© 2016 Mercury Marine
Part Number
J9666
Page 3B-47