Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 171Get this manual
Valve Block Installation IMPORTANT: Filter (Design System only) must be installed in shock rod cylinder with wider ridge of filter facing out
3Install check ball components (a) in valve block (Design System) While holding components in place using appropriate tool (screwdriver), connect valve block to shock rod cylinder as shown
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1Install lubricated a-rings on shock rod cylinder2Install filter and a-ring (Design System) with wider ridge of filter facing towards valve block