Installation manual

5-5
90-898305
Check Valve Kit – 1998/1999 135/150 OptiMax
Check valves have been to the crankcase oil delivery hoses to prevent
evacuation of oil from the hoses under certain running conditions and to
improve oil delivery to the engine. This product improvement is being offered
to current owners and on outboards in dealer inventory to provide improved
reliability and durability. The check valves have been installed on production
outboards as a running change beginning with serial number 0G886267.
Check valves used in production will be incorporated into the oil hose fitting
pressed in the cylinder block and not an inline check valve.
Check Valve Location – Port Side (Starboard Side Similar)
a) #2 Cylinder Oil Hose (Trim hose length as required)
b) #4 Check Valve/Hose Assembly
c) #6 Check Valve/Hose Assembly
d) Sta-Straps
Tip: If powerhead is replaced, check valves are in block fittings.
Check valves in oil lines must be removed.
Notes
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