Tube Ref No. Description Where Used Part No.
136
Lubriplate SPO 255 Valve stem keepers Obtain Locally
11. Install the valve stem keepers.
12. Confirm that the valve stem keepers are properly seated in the grooves of the valve stem.
a - Valve spring
compressor
b - Valve stem keepers
c - Retainer
d - Valve spring
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 6.2 Liter (377 cid)
Valve spring installed height
Intake
46.19 mm (1.818 in.) minimum
Exhaust
Typical
a - Cut away scale
b - Valve spring installed
height
Installation
1. Ensure that the engine block and cylinder head sealing surfaces are clean.
Engine Inspection and Assembly
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 3B-51
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