Mercury MerCruiser Service Manual page 252

Engine Inspection and Assembly
5. Press the valve stem oil seal with the valve stem seal installer until the seal contacts the chamfer on the cylinder head
guide.
a
Description
Kent‑Moore valve stem seal installer
6. For all intake and exhaust valves, ensure that the installed height is as specified.
b
a
Description
Valve stem oil seal
7. Install the valve spring.
8. Place a spring retainer on the valve spring.
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
Valve spring compressor
10. Coat the valve stem keepers with lubricant to hold in place.
Page 3B-50
Typical
b
a - Valve stem seal
b - Valve stem seal installer
30218
a - Valve guide boss
b - Bottom of valve stem oil seal
c - Installed height (no gap)
c
57440
Installed height
NOTE: Measured from the
top of the valve guide
bevel to the bottom of the
oil stem seal.
CAUTION
!
© 2016 Mercury Marine
Part Number
J42073
6.2 Liter (377 cid)
0 mm (0 in.) minimum
Part Number
90-8M0099748 eng DECEMBER 2015
J8062