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Oil temp/pressure

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28 May 2018 20:53 #1517 by Henry Pasquet
Replied by Henry Pasquet on topic Oil temp/pressure
That is good news. What about the camshaft bearings? Have you tried another direct reading gauge? It could still be the pump/ relief valve.

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28 May 2018 20:38 #1516 by Chris Carlisle
Replied by Chris Carlisle on topic Oil temp/pressure
Case overhaul and crankshaft ground by Aircraft Specialty Svcs in Tulsa approximately 300 hours ago.
Attachments:

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28 May 2018 19:38 #1515 by Henry Pasquet
Replied by Henry Pasquet on topic Oil temp/pressure
Even 50 weight oil gives low oil pressure when hot with worn bearings or pump. Did they turn the crank on the last overhaul or just put in new bearings on a worn crank to save money? Oil pressure on older cars drops as the oil heats up, even with 20X50. Worn bearings.

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28 May 2018 16:28 #1514 by Chris Carlisle
Replied by Chris Carlisle on topic Oil temp/pressure
What's strange is that it's so temperature dependent. Multi-grade oil is supposed to retain its viscosity throughout the operating temperature range. Why then would the low oil pressure seem to be so temperature dependent?

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28 May 2018 16:16 #1513 by Chris Carlisle
Replied by Chris Carlisle on topic Oil temp/pressure
Spin on filter is replaced with each oil change. And I've heard of adding washers to the high pressure relief valve Larry but the consensus is that it's a pipe dream. That valve only comes into play when the oil pressure is too high. Adding washers would raise the pressure at which the bypass channel comes into play but do nothing for the cruise oil pressure when low.

Nope, I'm thinking the accessory pad is gonna have to come off and pump gears and housing will need replacing. I seem to remember that you're right Bruce and this has to be done with engine off of mount. Anyone know any different?

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28 May 2018 15:53 #1512 by Bruce Bennett
Replied by Bruce Bennett on topic Oil temp/pressure
My 1946 415-C is on it's second 75 hp engine.
Oil temp on both run 190 on a warm day and
200 on a really hot day here in Kansas City.
Oil pressure on the original engine was 22 psi
on a hot day. The 2nd engine stays at 35 psi hot.
My bet is the oil pump on the accessory case
is worn. Unfortunately that requires an engine
removal to repair.

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