 Oil Pressure Funkiness... -6 Conversion |
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| roblav1 |
 Jul 6 2021, 02:27 PM
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Senior Member  Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region  |
Getting some funky oil pressure readings, never seen this before.
930/02 engine, fully rebuilt. Oil pressure sender matches the 911 gauge. Wiring is direct from sender to gauge. Ben's oil tank with stock 914-6 plumbing from tank to oil cooler. 12 quarts went in the system (external cooler up front) and oil level reads ok. Anyway, when cranking via battery, cold oil pressure reads almost 100 psi. Ok, seen that before. After the engine starts, at cold idle, oil pressure reads about 15 psi. Cold pressure is around 30 psi at about 3000 rpm. Not good. Why? Why good pressure at cranking then terrible pressure while running? Does this sound like a collapsing oil tube? Oil pump seal failure? Broken oil pump shaft? Or just a bad sender? I think it's time to manually measure the oil pressure. This engine is way too valuable to ruin. This is my 6th 911 engine rebuild. Thanks for any insights. Rob |
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Posts in this topic
roblav1 Oil Pressure Funkiness... -6 Conversion Jul 6 2021, 02:27 PM
lesorubcheek My guess would be a sticking pressure valve piston... Jul 6 2021, 03:40 PM mepstein Oil lines going to the right place?
It is easy to... Jul 6 2021, 04:16 PM roblav1 This 1976 930/02 engine was supposed to have the o... Jul 6 2021, 05:30 PM mepstein I just put a euro carrera engine up for sale on pe... Jul 6 2021, 05:52 PM roblav1 Thanks Mark. Small world. I met Fred at Hershey ... Jul 6 2021, 06:25 PM
mepstein
Thanks Mark. Small world. I met Fred at Hershey... Jul 6 2021, 06:42 PM mb911 10 psi per 1000rpm is perfectly normal. Cold my en... Jul 7 2021, 05:38 AM Justinp71
10 psi per 1000rpm is perfectly normal. Cold my e... Jul 7 2021, 10:05 PM roblav1 Concur Ben. 10psi per 1000rpm while hot is normal... Jul 7 2021, 08:14 AM mb911
Concur Ben. 10psi per 1000rpm while hot is norma... Jul 7 2021, 11:25 AM mb911 Then lastly bearing clearances. And also make sure... Jul 7 2021, 11:25 AM roblav1 Ok... chalk this one up to dumbsh**. I was being... Jul 7 2021, 06:26 PM mb911 So it holds 15 qts? Wow that's a big system. Jul 8 2021, 05:27 AM 9146GUY Not really a big system. Oil lines and coolers tak... Jul 8 2021, 06:17 AM  |
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