Re: '35 Standard 8 Oiling issue
Posted by Owen_Dyneto On 2011/7/1 10:16:11
ClassicCruiser:
You did ask how to adjust your maximum oil pressure. Pictured below is the oil pressure relief valve assembly from my 1934, yours should be identical. Look for it on the driver's side of the engine block, at the lower edge of the aluminum crankcase casting where it meets the oil pan.
There are TWO relief valves in this assembly. The vertical one with plain hex cap is the filter bypass; since the engine has full-flow filtration this is the one that must open if the filter clogs to permit the bearings to receive oil and this is NOT the one you are now concerned with.
To adjust the maximum pressure, remove the nickel-plated acorn nut cover as shown. Next there is a hex jam nut which must be loosened, only 1/4 turn or so - not important how much. The threaded shaft terminates in a screwdriver slot. Unscrew (CCW) to lower pressure. You can do it with the engine running and the hand throttle set to give you max pressure and then adjust accordingly, or you can just trial-and-error it. After you've got it where you want it, tighten the jam nut and reinstall the cover. Should be that easy but if someone has buggered it in the past and you can't get a setting with the desired pressure or if the threaded rod had to be unscrewed so far the cover wouldn't fit, it might be necessary to remove the valve itself from the body casting and remove shims to lessen the spring compression.
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You did ask how to adjust your maximum oil pressure. Pictured below is the oil pressure relief valve assembly from my 1934, yours should be identical. Look for it on the driver's side of the engine block, at the lower edge of the aluminum crankcase casting where it meets the oil pan.
There are TWO relief valves in this assembly. The vertical one with plain hex cap is the filter bypass; since the engine has full-flow filtration this is the one that must open if the filter clogs to permit the bearings to receive oil and this is NOT the one you are now concerned with.
To adjust the maximum pressure, remove the nickel-plated acorn nut cover as shown. Next there is a hex jam nut which must be loosened, only 1/4 turn or so - not important how much. The threaded shaft terminates in a screwdriver slot. Unscrew (CCW) to lower pressure. You can do it with the engine running and the hand throttle set to give you max pressure and then adjust accordingly, or you can just trial-and-error it. After you've got it where you want it, tighten the jam nut and reinstall the cover. Should be that easy but if someone has buggered it in the past and you can't get a setting with the desired pressure or if the threaded rod had to be unscrewed so far the cover wouldn't fit, it might be necessary to remove the valve itself from the body casting and remove shims to lessen the spring compression.
Attach file:
(310.62 KB)
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