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04-20-2014, 02:45 AM | #1 |
Registered User
Join Date: Feb 2014
Location: Reidsville NC
Posts: 18
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Oil pressure problems...
First off yes I checked and used the search tool. I am having oil pressure issues. The motor has about 1000 miles or so on it. Its the 235.5. While driving it is running about 40 psi and unless I gear down and run out the gear before I stop she loses oil pressure. On start up she has about 20 and at any other idle she is normal. The only time I have issues is when I am driving and push in the clutch and dont run the gea down.
I am running 15w40 rotella |
04-20-2014, 12:40 PM | #2 |
Member #1049
Join Date: Jun 2000
Location: Troy Montana
Posts: 3,940
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Re: Oil pressure problems...
It sounds like the crankshaft thrust main bearing has excessive clearance, you might try grabbing the harmonic balancer/pulley and see if you can move the crankshaft back and forth (front to back) by hand.
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04-20-2014, 12:47 PM | #3 |
Registered User
Join Date: Jul 2010
Location: Mesa, AZ
Posts: 513
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Re: Oil pressure problems...
First, not to doubt, are you sure it is a 235? That is an earlier era block. IIRC the 6 cyl engines available were 250 or 292 (chevy), GMC had others. Does your engine have a spin on oil filter?
The 235 is a low pressure block and 20-40 are very normal. What does 'running the gear down' mean?
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JB from AZ 1969 Chevy Sub K10 1957 Chevy 3200 1962 VW Beetle 1957 Willys CJ5 |
04-20-2014, 03:17 PM | #4 |
Registered User
Join Date: Feb 2014
Location: Reidsville NC
Posts: 18
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Re: Oil pressure problems...
It doesn't have any type oil filter spin on or cartridge. I will double check but I am pretty sure its a 235.5 Running down the gear means using the gear to slow myself instead of using brakes .
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04-20-2014, 09:02 PM | #5 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,774
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Re: Oil pressure problems...
Quote:
Do you lose oil pressure turning corners, braking, or accelerating? The reason I ask is because I have a '67 with a 454 in it and the oil pressure is good unless I am turning corners, braking, or accelerating, then it loses oil pressure. I think the screen may have fallen off of the oil pump pickup tube. If I put an extra quart of oil in it it doesn't lose pressure no matter how I drive it. Just something else to consider.... I am going to drop the pan on mine to check it out this next week. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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04-20-2014, 09:17 PM | #6 |
Registered User
Join Date: Feb 2014
Location: Reidsville NC
Posts: 18
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Re: Oil pressure problems...
Just on quick or sudden stops
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