Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 258Get this manual
Troubleshooting Flow Diagram Results
Outboard will not hold tilted position in reverse andor trails out during high speed decelerationResults
Inspect Manual Release ValveI
Manual release valve andor a-ring damage
Manual release valve and a-rings appear to be OKReplace O-rings and proceed
Replace defective valve and O-ringsResults
Inspect Trim Rod Piston Check Valve
Results
No debris or defective components found Debris found in check valve componentsInspect Manifold Reverse Thrust ValveClean check valve components using engine cleaner and compressed air or replace
ACAUTION