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  #1  
Old 10-10-2020, 08:59 AM
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puckettj puckettj is offline
232 I6
 
Join Date: May 17, 2011
Location: Alpharetta, GA
Posts: 152
No oil pressure on warm/second start

Rebuilt 360-89 GW. Starts cold with great oil pressure. Runs with great oil pressure, all since rebuild a few years ago. On 2nd, 3rd, etc start of the day may have no pressure and can hear the top end clacking. Revving it sometimes works and pressure kicks in and stays in.

Changed oil and filter, seems better but still happening.

Oil pump going, bad filter, something else? Thanks for any tips.
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  #2  
Old 10-11-2020, 02:51 AM
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FSJunkie FSJunkie is offline
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Rule #1 of FSJ ownership: the factory oil pressure gauge is never to be trusted. Verify with a known good and accurate gauge before you decide that something is wrong with your engine.
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  #3  
Old 10-11-2020, 06:27 AM
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puckettj puckettj is offline
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Location: Alpharetta, GA
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Quote:
Originally Posted by FSJunkie
Rule #1 of FSJ ownership: the factory oil pressure gauge is never to be trusted. Verify with a known good and accurate gauge before you decide that something is wrong with your engine.

Gauge works fine. The can hear metal on metal.
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  #4  
Old 10-11-2020, 06:41 AM
wiley-moeracing wiley-moeracing is offline
350 Buick
 
Join Date: Feb 15, 2010
Location: arizona
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Check the relief valve in the oil pump, may be sticking open, replace oil filter with a good quality one, and run again and see if that helps.
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  #5  
Old 10-15-2020, 08:55 AM
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tgreese tgreese is offline
 
Join Date: May 29, 2003
Location: Medford MA USA
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The valves clattering indicates that you have zero oil pressure. IMO that's quite certain.

The pressure relief valve is a good place to start. If that's not it, you have to imagine how the pressure could go away.

The oil pickup in the oil pan could have fallen off or become clogged.

There could be some air leak in the oil filter adapter or oil system that allows the oil pump to drain and lose prime. You could try the electric drill method of priming to see if you get oil pressure. That would be a good test without running the engine.

I don't know if it's possible, but the distributor could be engaged with the drive gear on the timing gear and not seated in the oil pump shaft. The distributor gear drives both the oil pump and the distributor. The distributor must be fully seated in the timing cover. When inserting the distributor, you must align both the distributor gear and the slot in the oil pump drive shaft. This can be tricky.

How else? Could a defective oil filter bypass all the oil pressure back into the pan? There is a diagram of the oiling system in the TSM. Trace it through in your mind and look for other possibilities.
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Last edited by tgreese : 10-15-2020 at 09:43 AM.
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  #6  
Old 10-23-2020, 12:17 PM
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puckettj puckettj is offline
232 I6
 
Join Date: May 17, 2011
Location: Alpharetta, GA
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Changed oil filter to Wix. Thought it solved it but then boom, no oil pressure after driving all day on my last start. Took 30 to 60 seconds and bang...normal oil pressure again.
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  #7  
Old 10-23-2020, 12:44 PM
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SOLSAKS SOLSAKS is offline
350 Buick
 
Join Date: Jul 25, 2016
Location: Benson. NC
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dang
hope it is fixed now
let us know

looks like a nice GW in your avatar photo

and in a great part of the US,.........SOUTHEAST

any photos ?....build thread ?

dave in NC
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  #8  
Old 10-26-2020, 07:59 PM
Rusty76 Rusty76 is offline
258 I6
 
Join Date: Jul 15, 2018
Location: Cochrane
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I'm interested. Sorry I'm not much help. Let us know what you figure out.
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