Tilt/trim pump check valves

[jamesalan]

In another post about tilt/trim pump problems, RRitt mentioned about this : ( check valves. In some literature they may be referred to as manual release plugs. You can buy the valve from mercury. I think the part number is F17620 ) Does anyone know where I can go online and see a parts diagram that shows these? I just replaces all the o-rings in the pump, the ones on these checks and the one on the slideing peice in the middle of them. Still have bleed-down after tilted up. Recon these will have to be changed out or just rebuild the tilt cylinder? I figured the o-ring replacement would have fixed it, but it did not. Then I saw the post about the check valves.

 

[RRitt]

Re: Tilt/trim pump check valves

In another post about tilt/trim pump problems, RRitt mentioned about this : ( check valves. In some literature they may be referred to as manual release plugs. You can buy the valve from mercury. I think the part number is F17620 ) Does anyone know where I can go online and see a parts diagram that shows these? I just replaces all the o-rings in the pump, the ones on these checks and the one on the slideing peice in the middle of them. Still have bleed-down after tilted up. Recon these will have to be changed out or just rebuild the tilt cylinder? I figured the o-ring replacement would have fixed it, but it did not. Then I saw the post about the check valves.

bleed down is almost always the check valves 1974-1988. usually the check valve from 1988-1992. rarely the check valves 1992-1995. the check valves offerred by mercury were for 1981-1989. they do not fit pumps with allen key plugs. get a shop manual before starting

https://www.crowleymarine.com/mercury-outboard/parts/7480_130.cfm
http://www.mercurypartsexpress.com/us/valve-kit-check-p1978.html

 

[jamesalan]

Re: Tilt/trim pump check valves

OK, and yes, these have the allen key plugs.

 

[RRitt]

Re: Tilt/trim pump check valves

allen key design is easier to service but has history of metal fatigue
on 120HP and larger. I am guessing aftermarket design with allen
key will experience more rapid metal fatigue at lower horsepower
due to their use of softer metals.

if you try home repair then make sure to inspect check valve housing
metal fatigue or stretching. swap front and rear check valves during
assembly since rear valve has less stress. If check valve cap does
not fit firmly due to metal stress then locate a good used replacement.