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03-23-2006, 08:29 PM
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#1 |
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Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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Slow Oil Leak
I have a leak, but for the life of me I cant tell where. Its not a big leak, but
enough to make a puddle in the drip pan I have after a month. My engine was just rebuilt about 5k miles ago. What are the comon areas for a leak so I can try and hunt it down? Thanks! PS - 307 V8 stock engine with the original valve covers and oil pan.
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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03-23-2006, 08:48 PM
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#2 |
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Registered User
Join Date: Dec 2005
Location: Lengby, Minnesota
Posts: 225
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Re: Slow Oil Leak
I would look at the dust cover on the tranny to see if a drop has formed there. Unless the engine builder had a problem with other gaskets, the rear main is normally the culprit. You might also just want to check the valve cover bolts. I've found them only finger tight after a rebuild when the motor warmed up. Good luck and I hope it's something simple.
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03-23-2006, 08:55 PM
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#3 |
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Watch out for your cornhole !
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Slow Oil Leak
Valve covers or intake manifold end seals are common leakers.
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I'm on the Instagram- @Gearhead_Kevin |
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03-23-2006, 09:38 PM
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#4 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,709
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Re: Slow Oil Leak
Not much to go on but if you can't find it from the common places I would look at the back of the intake and if you have a mechanical oil pressure gauge
check the fittings behind the distributor. An electric op sending unit has been known to leak also. Some not so common places are, under the distributor base, behind the fuel pump mount, and the mounting gasket for the oil filter. Can you tell what part of the engine it's coming from? I assume we're talkin oil and not tranny fluid.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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03-24-2006, 12:13 AM
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#5 |
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67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: Slow Oil Leak
Go to the GM dealer and buy a bottle of UV dye that you use with a black light. It's about $8 for an ounce.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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03-24-2006, 08:46 AM
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#6 |
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Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: Slow Oil Leak
The common areas for an oil leak in a chevy is anywere that has oil in it.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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03-24-2006, 11:01 AM
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#7 |
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No,I DON'T have Tourett's
Join Date: Mar 2005
Location: Reno, NV
Posts: 556
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Re: Slow Oil Leak
Chevy's and Harley's.......if they aren't leaking oil they aren't running right.
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'72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater |
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03-24-2006, 11:09 AM
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#8 |
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It's a catastrophic success.
Join Date: Jan 2003
Location: Oklahoma
Posts: 2,077
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Re: Slow Oil Leak
Get you some engine degreaser, go to car wash and hose it down clean,take it around the block a couple of times and get a flashlight and do some inspecting keep doing this until you get a drip to show.If its your rear main seal it wont show up until it drips out the weep hole in the dust cover.
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03-24-2006, 11:25 AM
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#9 | |
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Registered User
Join Date: Mar 2006
Location: USA
Posts: 21,020
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Re: Slow Oil Leak
Quote:
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03-24-2006, 11:25 AM
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#10 |
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Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: Slow Oil Leak
Speaking of dust cover I do not have one over my flywheel I guess I should try and find one for my th400.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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03-24-2006, 12:00 PM
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#11 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Slow Oil Leak
put cardboard down on the floor to have a mark where it's dripping then just look up from there
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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03-24-2006, 12:19 PM
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#12 | |
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Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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Re: Slow Oil Leak
Quote:
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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03-24-2006, 12:49 PM
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#13 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Slow Oil Leak
well if it's dripping from the front crossmember that eliminates the back of the engine// theres the hole(should be sealed with a short bolt with sealant) on the front of the block near the fuel pump,the fuel pump mount, the timing chain cover the front crankshaft seal , the front intake gasket,or the valve covers, oilpan gasket too// or it could be power steering???
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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03-24-2006, 09:32 PM
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#14 | ||
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Son Of Gravel Man
Join Date: Mar 2005
Location: Cleveland OH
Posts: 638
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Re: Slow Oil Leak
Quote:
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Daily driven 70 C10 longbed Its a work in progress  Quote:
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