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#1 |
Registered User
Join Date: Dec 2009
Location: Gap PA
Posts: 280
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I have a pretty bad oil leak...
SOMEWHERE at the top of the back of the block, and it's a nice steady drip... it has the trans, starter, and everything else under the truck covered in oil, even has a baked on black spot on the long tube header, just on the passenger side. I replaced the intake gaskets twice, once with and once without the rubber inserts for the middle. Distributor is clean. It's our basic TBI 5.7 from 1990, .202 heads if that makes any difference. HALP!
__________________
1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig! |
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#2 |
Registered User
Join Date: Nov 2010
Location: Windsor Locks
Posts: 628
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Re: I have a pretty bad oil leak...
oil pressure sending unit or line for a gauge?
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#3 |
Registered User
Join Date: Dec 2009
Location: Gap PA
Posts: 280
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Re: I have a pretty bad oil leak...
The sending unit is down on the driver's side of the block, and where the other style unit would go on top is totally dry
__________________
1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig! |
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#4 |
Registered User
Join Date: Nov 2010
Location: Windsor Locks
Posts: 628
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Re: I have a pretty bad oil leak...
Im trying to think of where else it could come from back there. Is the oil pooling around the intake bolts?
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#5 |
Registered User
Join Date: Dec 2009
Location: Gap PA
Posts: 280
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Re: I have a pretty bad oil leak...
No, it's basically running down the bell housing and starter wires and thanks to driving it's all over everything else behind the bell housing. FLywheel is dry [havent put the clutch dust cover back on yet]
__________________
1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig! |
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#6 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: I have a pretty bad oil leak...
You have to have the middle seals. The plug at the back may be leaking as well as the distributor seal. Otherwise your valve cover gaskets are shot
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#7 | |
Registered User
Join Date: Dec 2009
Location: Gap PA
Posts: 280
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Re: I have a pretty bad oil leak...
Quote:
![]() Is it possible that the intake could be cracked where the distributor goes through? Only thing is, like I said, intake is dry, block is wet.
__________________
1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig! |
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#8 |
Registered User
Join Date: Oct 2010
Location: Lethbridge, Alberta
Posts: 124
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Re: I have a pretty bad oil leak...
I had the same problem with my tbi it leaked all over the trans and down onto the starter it turned out to be the distributor seal. i know it might not look like it at first because mine sure didnt until i took it out to get a closer look.
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Cole. 1967 GMC c15 1991 k2500 2005 2500hd Duramax |
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#9 |
Registered User
Join Date: Feb 2012
Location: Austin, Arkansas
Posts: 248
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Re: I have a pretty bad oil leak...
I agree.It's either the distributor gasket,or the neoprene seal between manifold/block has slipped.I don't use them,anymore.I just use Hi-temp silicone,and clean/dry the surfaces.
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Always expect the unexpected,....but don't expect the unexpected to be the unexpected you expect ! I'm busier than a one-legged cat,in a sandbox! Veteran..and proud ! I can't fix what ain't broke....you want I should break it? |
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#10 |
Registered User
Join Date: Dec 2011
Location: Regina, SK, Canada
Posts: 622
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Re: I have a pretty bad oil leak...
Valve covers are usually the culprit here. Make sure you bang your covers straight, another good upgrade is get some extended tabs for the covers it spreads the bolt tension farther out on the cover. These are a little wing shaped steel tab that you put your existing bolt through. Seeing as you have done the intake I would make sure your valve covers are straight and tab them up.
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1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4 |
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#11 | |
Registered User
Join Date: Dec 2009
Location: Gap PA
Posts: 280
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Re: I have a pretty bad oil leak...
Quote:
__________________
1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig! |
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#12 |
Registered User
Join Date: Dec 2009
Location: Gap PA
Posts: 280
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Re: I have a pretty bad oil leak...
Yeah I went your route the second time and still, same issue.
__________________
1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig! |
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#13 |
Registered User
Join Date: Jan 2010
Location: Roanoke, Tx.
Posts: 1,561
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Re: I have a pretty bad oil leak...
My 87 with a 305, and TBI leaked like yours is leaking. It was the intake. I paid a shop to replace it, because I did not feel like doing it. You said you replaced yours. Maybe you did it wrong. Clean it real good then drive it, and put it on a host and shine a light up the back of the engine, and maybe you will see where it is leaking from. Let us know what you find out.
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