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Function of pressure relief valve in ...

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Function of pressure relief valve in oil pump? « Previous Next »

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Roman Traber
New member
Username: swiss_graymarine

Post Number: 1
Registered: 01-2014
Posted on Sunday, January 26, 2014 - 12:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I am rebuilding a1959 Graymarine Model 116. This is a 6 Cylinder 226cui (Continental) engine.
Now I found out that, beside the Pressure Relief Valve in the block, there is another Pressure Relief Valve incorporated in the Oil Pump itself. Both Valves are having about the same parts like piston and spring. I checked the force and travel of the pistons with the result that the valve in the pump starts to open @ 13 psi. The overflow will go thru the hollow shaft of the oil pump into the oil gallery. The valve in the block starts to open @ 35 psi. This overflow goes back to the oil pan.
I couldn’t find any information in the Graymarine Maintenance Handbook as well as in shop manual of the 226 Continental engine about the In-Pump relief valve. Can anybody explain the job of this valve? Any ideas and opinions would be very welcome.

Thanks and regards from Switzerland.

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