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Clooney
12-22-2002 07:23:13
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Re: clooney, oil pressure on early 60 in reply to Don c, 12-22-2002 06:04:31
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Don, the oil pressure should be checked hot at fast idle [1100 RPM's or so], not idle . Do not set it at idle or it could be too high at fast idle.
~I suppose you could turn the pressure screw all the way in, but you will find a point short of turning it all the way in where turning the screw any farther won't increase the oil pressure any. If it is turned in too far [or past max hot] it won't improve the oil pressure, but will increase the cold pressure enough to cause problems.
~You can leave the plug out while adjusting it.
~Remember by turning that adjustment screw all you are doing is decreasing the amount of oil that by-passes the oil circuit & it won't add anything more to a system if the pump can't keep up with demand to begin with. In most cases on a hot engine with bearing & pump wear the pump can't keep up with demand at idle so the by-pass valve is closed already & turning that screw won't have any effect. ~If you have 7 psi at idle but higher pressure at high idle, it isn't an adjustment problem. The engine needs more oil flow than the pump can provide due to anything from leaking oil lines, to worn bearings, to leaking oil filter head gasket, to worn oil pump to, thin oil, to ?.
~To understand the oil system in a 2-cylinder Deere...Hook a garden hose to your faucet & hook the other end to a sprinkler, now drill a 1/2" hole in the hose about 1/2 way between the sprinkler & faucet. Turn the faucet on & watch the sprinkler, you will have water coming out the 1/2" hole & some coming out the sprinkler. Now take your finger [it is the pressure regulator screw] & cover the 1/2" hole. More water will come out of the sprinkler & none out of the 1/2" hole. You can modulate the amount of water coming out of the sprinkler by allowing more or less water to come out that 1/2" hole but you will never be able to get more coming out of the sprinkler than is available to begin with. All you can do with that hole is lower the sprinkler pressure below faucet pressure, never raise it above what you have with the hole covered up. The Deere oil system is the same idea, once the pressure adjusting screw [by-pass hole valve] is turned in far enough that the by-pass hole is closed, turning the screw in any farther won't increase the pressure or flow any. The Deere system uses a spring between the adjusting screw & by-pass valve to try to maintain constant oil pressure, but once the pump flow drops below demand the valve is always closed & the pressure you have is a direct result of pump supply vs. need. If the engine needs more than the pump can supply you will have low oil pressure.
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