Installation - Mercury MerCruiser Service Manual

Tube Ref No.
Lubriplate SPO 255
136
11. Install the valve stem keepers.
12. Confirm that the valve stem keepers are properly seated in the grooves of the valve stem.
a
13. Slowly release the valve spring compressor.
14. Set the assembly by tapping the valve stem with a soft plastic hammer.
15. Check the installed height of the valve springs using a narrow, thin scale. Measure from the spring seat to the top of the
valve spring.
IMPORTANT: To ensure correct measurement, measure the spring height from the top of the valve spring, not the top of
the valve.
IMPORTANT: If measurement exceeds specified height, install a valve spring shim and recheck. Do not shim valve springs
to give an installed height less than the minimum specified.
Description
Valve spring installed height
a

Installation

1. Ensure that the engine block and cylinder head sealing surfaces are clean.
90-8M0099748 eng DECEMBER 2015
Description
Exhaust
Where Used
Valve stem keepers
b
c
d
Intake
© 2016 Mercury Marine
Engine Inspection and Assembly
Obtain Locally
a - Valve spring
compressor
b - Valve stem keepers
c - Retainer
d - Valve spring
33025
6.2 Liter (377 cid)
46.19 mm (1.818 in.) minimum
Typical
a - Cut away scale
b - Valve spring installed
height
b
19503
Part No.
Page 3B-51