Chrysler 70, 75 and 85 HP Outboard Motors Service Manual OB 3438, Page 58Get this manual
Subsection
_ REED VALVE ASSEMBLY
GENERAL
The information in this subsection covers the removal, disassembly, repair and installation of the reed valve
SERVICING
Removal
1Disconnect fuel line from bottom carburetor (to fuel pump)and carburetor intake cover drain hose from intake manifold (carburetor adapter flange to intake cover) Figure 12Disconnect throttle linkage as follows :
DESCRIPTION
The reed valve is located between the carburetor and the crankcase of the motorThe reed valves time the injection of the fuel mixture from the carburetors into the crankcase by opening only when the pressure in the crankcase has dropped to predetermined point on the compression strokeThe reeds are designed to maintain constant contact with the reed plate until pressure changes within the crankcase occur Reed travel away from the plate is limited by the reed stopWhen crankcase pressure increases, the built-in spring action of the reeds returns and holds them against the plate