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Re: 340 oil pump question
[Re: Imrare]
#2948416
07/29/21 08:54 AM
07/29/21 08:54 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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IMHO, a few days/months should not be a problem. priming is a good idea if it has been sitting not running or empty for months/years. or installing a new pump out of the box.
I worry more about lifter bleed down when they sit for extended time (months/yrs) pump always pumps oil on start up but lifters clatter till they get pump back up and full of oil.
if you have a mech oil gauge you will see it fire off and a couple seconds later you see the psi shoot up. that's the time it takes for oil to go thru pick up tube/pump/filter/passage to sender port. then on too lifter galleys.
stock electric oil gauge may be a little slow to react and only seem to take longer. this is why I prefer a mech gauge. reacts faster on start up. if there is no oil flow you see it right away.
Last edited by scratchnfotraction; 07/29/21 09:14 AM.
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Re: 340 oil pump question
[Re: Imrare]
#2948439
07/29/21 10:08 AM
07/29/21 10:08 AM
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Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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It shouldn't be an issue.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 340 oil pump question
[Re: Imrare]
#2948565
07/29/21 03:14 PM
07/29/21 03:14 PM
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Joined: Jan 2003
Posts: 25,757 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,757
Rio Linda, CA
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Would simply draining the oil from the oil pan cause the pump to lose its prime? Thanks I would think that removing the filter would cause the pump to lose prime more so than draining the oil. Think thumb over straw.
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Re: 340 oil pump question
[Re: John_Kunkel]
#2948592
07/29/21 04:36 PM
07/29/21 04:36 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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Would simply draining the oil from the oil pan cause the pump to lose its prime? Thanks I would think that removing the filter would cause the pump to lose prime more so than draining the oil. Think thumb over straw. I agree with this. I often let my engine sit over night and change oil before start up the next morning. this lets all the oil drain down out of engine and I don't have any oil spillage when removing the filter. less mess. keeps oil off me & the headers. I have only had issues on BB engines not wanting to prime after oil change and had to back the oil filter off and let it purge the air pocket then it would pump/fill filter. but never on a SB engine.
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Re: 340 oil pump question
[Re: scratchnfotraction]
#2948611
07/29/21 05:50 PM
07/29/21 05:50 PM
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Joined: Jan 2004
Posts: 8,241 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,241
fredericksburg,va
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When pan is full of oil, the pump is almost if not submerged in the oil. Not like a 440 where it hangs out on the front side of block.
Last edited by cudaman1969; 07/29/21 05:51 PM.
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