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Author
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Topic: BIG oil pressure problem
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90hogg
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Member # 5313
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posted
 
 
Engine has less than 3k but Im on my third oil pump. After about 1000 miles it loses pressure at idle. Hit the gas and it goes up and back down. Ive had 2 melling hv pumps and now the fms one. All did the same thing. Please help.
Posts: 48 | From: California | Registered: Feb 2005
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silverLX
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Member # 3207
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posted
sounds like an internal problem, like bearings maybe...I would pull the motor and check it out.
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88LX hatch 410w
88LX vert gears, exhaust
95GT H/C/I
Posts: 1613 | From: Sonoma County | Registered: Aug 2003
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90hogg
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Member # 5313
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posted
Could this have been a bad install? Dss 347 kit bored 40 in fms block.
Posts: 48 | From: California | Registered: Feb 2005
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silverLX
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Member # 3207
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posted
How does the oil look?? is there any metal in it, or at the bottom of the pan?
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88LX hatch 410w
88LX vert gears, exhaust
95GT H/C/I
Posts: 1613 | From: Sonoma County | Registered: Aug 2003
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JohnB
Tech Moderator
Member # 969
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posted
After 3 pumps, I'd say it's not a pump. ![[Wink]](wink.gif)
Pull the engine, check the #5 main and #4/#8 rod bearings. If they look good, pull the cam and check those bearings. What were the clearances when the engine was assembled? Please say someone checked them...and didn't just put it together...
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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90hogg
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Member # 5313
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posted
I will check the oil and ask the installer if he checked the clearances. Thanx for the input thus far.
Posts: 48 | From: California | Registered: Feb 2005
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90hogg
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Member # 5313
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posted
Nothing in the oil and the installer said he clearanced eveything. May have to pull the engine and check those bearings.
Posts: 48 | From: California | Registered: Feb 2005
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silverLX
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Member # 3207
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posted
quote:
Originally posted by 90hogg:
May have to pull the engine and check those bearings.
Thats what I would do, GOODLUCK ![[patriot]](graemlins/patriot.gif)
[ May 24, 2005, 09:44 AM: Message edited by: SilverLX351 ]
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88LX hatch 410w
88LX vert gears, exhaust
95GT H/C/I
Posts: 1613 | From: Sonoma County | Registered: Aug 2003
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CDT
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Member # 5004
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posted
what are the pressures your getting??? Are you sure about the galley pulg at the back of the lifter valley?
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Custom Dyno Tuning
510.331.0608
Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills
Posts: 1053 | From: Hayward | Registered: Nov 2004
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Hungry Hippo
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Member # 537
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posted
do you have a hardened oil pump shaft? maybe something is binding and breaking your oil pumps
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05 S4 Avant(wagon)
09 C6 H/C/I
Posts: 2959 | From: east bay | Registered: Nov 2001
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93LX342
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Member # 1793
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posted
oil pump drive shaft may be to long forcing it to grind into baseplate of pump which will cause the pump to work less efficiently.
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06 f250 superduty with some mods.
95 f250
www.unlimitedracing.com
Posts: 1036 | From: san jose | Registered: Sep 2002
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90hogg
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Member # 5313
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posted
I do have an ARP hardened shaft. Should I change it because it may be too long?
Posts: 48 | From: California | Registered: Feb 2005
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93LX342
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Member # 1793
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posted
just put distributor in and look at where it meets the block.if it is not seating all the way the shaft may be to long and causing the problem.
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06 f250 superduty with some mods.
95 f250
www.unlimitedracing.com
Posts: 1036 | From: san jose | Registered: Sep 2002
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90hogg
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Member # 5313
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posted
Pulled the k-member and the pan. Pan had metal bits in it. The #4 and #8 rod bearings were damaged. Im going to replace the pump and the rod and main bearings. Should this get rid of my problem?
Posts: 48 | From: California | Registered: Feb 2005
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TRIXSNK
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Member # 2844
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posted
quote:
Originally posted by JohnB:
After 3 pumps, I'd say it's not a pump.
Pull the engine, check the #5 main and #4/#8 rod bearings.
![[worship]](graemlins/worship.gif)
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9 Sec EVO 9 is GONE!
New project in the works.......
Posts: 3740 | From: Bay Area | Registered: May 2003
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getjobdone
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Member # 4666
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posted
quote:
Originally posted by TRIXSNK:
quote:
Originally posted by JohnB:
After 3 pumps, I'd say it's not a pump.
Pull the engine, check the #5 main and #4/#8 rod bearings.
i agree
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91 notch ^ blown h/c/i
Posts: 677 | From: east bay,ca | Registered: Jul 2004
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90hogg
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Member # 5313
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posted
The number 3 main bearing was shot and the number 4/8 rod bearings were damaged, crank also had damage. The oil pump also had shavings from the bearings inside it. Can anyone tell me what caused this. And what to do so this problem is resolved. My installer replaced the pump, bearings and the crank with new ones. I just dont want to go through this Sh*t again.
Posts: 48 | From: California | Registered: Feb 2005
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JohnB
Tech Moderator
Member # 969
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posted
What caused it? 1 of 3 things...
1. Your installer did not check thrust clearances or crank clearances.
2. You bought REALLY CHEAP bearings...
or 3. You beat the beeee-jeeeezus outta it.
I hope he completely tore down that block and hot-tanked it, as well as replacing the cam bearings. In not, you're asking for trouble. ![[Frown]](frown.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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