5. Press the valve stem oil seal with the valve stem seal installer until the seal contacts the chamfer on the cylinder head
guide.
Typical
a - Valve stem seal
b - Valve stem seal installer
Description Part Number
Kent‑Moore valve stem seal installer J42073
6. For all intake and exhaust valves, ensure that the installed height is as specified.
a - Valve guide boss
b - Bottom of valve stem oil seal
c - Installed height (no gap)
Description 6.2 Liter (377 cid)
Valve stem oil seal
Installed height
NOTE: Measured from the
top of the valve guide
bevel to the bottom of the
oil stem seal.
0 mm (0 in.) minimum
7. Install the valve spring.
8. Place a spring retainer on the valve spring.
!
CAUTION
Improperly compressed springs or improperly locked valve caps could allow the spring to be ejected with tremendous force,
which could cause personal injury. Use care when compressing the valve springs or releasing the valve spring compressor
tool.
9. Compress the valve spring using a valve spring compressor.
Description
Part Number
Valve spring compressor J8062
10. Coat the valve stem keepers with lubricant to hold in place.
Engine Inspection and Assembly
Page 3B-50 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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