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 2Likes
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Post By Frank Messina
08-13-2014, 02:07 PM
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CC Member
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Join Date: Oct 2007
Cobra Make, Engine:
Posts: 176
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Oil out of bellhousing - any idea ???
Hi guys,
I use a Ford FE390 with a TKO600 tranny. When I lift up the car, I saw some small drops of oil coming out of the bellhousing (lowest point). any idea where this oil comes from ? Engine and tranny ran about 2000miles up to now....
Thanks, Stephan |
08-13-2014, 03:39 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
Most likely rear main seal
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08-13-2014, 03:43 PM
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CC Member
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Join Date: Dec 2004
Location: Yorba Linda,
CA
Cobra Make, Engine: FFR, V8, Manual Trans, Htr, Wipers, Radio Delete
Posts: 327
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Oil pan, valve covers, intake manifold, rear main seal. In that order. An aftermarket oil pan can be a real bugger to seal up and what happens is the oil will weep out and run back along the pan rails and down the face of the bell housing front cover. Run your finger along the pan rail and see if it's wet.
Frank
__________________
FFR - V8, Manual Trans, PS, Inop Wipers, No Radio, Gas Mileage so-so
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08-13-2014, 04:26 PM
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Join Date: Feb 2008
Location: Rochester,
NY
Cobra Make, Engine: Superformance
Posts: 194
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Quote:
Originally Posted by Frank Messina
Oil pan, valve covers, intake manifold, rear main seal. In that order. An aftermarket oil pan can be a real bugger to seal up and what happens is the oil will weep out and run back along the pan rails and down the face of the bell housing front cover. Run your finger along the pan rail and see if it's wet.
Frank
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I have a Roush 402 and TKO600.
After double checking the oil pan, I replaced the valve cover gaskets. Any time I notice a drip on the bellhousing, it never fails that the valve covers need to be snugged a bit. Tighten and no more drips.
I also have had an oil drip from the mechanical speedo connection on the side of the TKO. Turns out the metal cylinder was missing an O-ring. |
08-13-2014, 04:48 PM
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CC Member
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Join Date: Jun 2010
Location: North of Toronto,
Ont
Cobra Make, Engine: Superformance #1950, Roush 402R, TKO600
Posts: 552
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I would check the valve cover gaskets first. It does sound like it could be the rear main seal.
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08-14-2014, 04:58 AM
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,483
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If it appears to be running down inside the bellhousing (outside dry) then that would tend to point more towards rear seal or rear cam plug. But, always best to check the easy stuff first.
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08-14-2014, 05:15 AM
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Join Date: Aug 2010
Cobra Make, Engine: RUCC, SB 331 Stroker
Posts: 171
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08-14-2014, 06:02 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,554
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Does your Bell Housing have an inspection plate on it? Mine does and in the bottom it has a small hole about the size of a match stem that goes back into the inside. If I find an oil drop I can tell if it came from the inside or the outside of the plate as the wind will blow a small amount of oil all over. What I do to make sure is wipe it clean and then stick a small piece of cotton in the hole. Later I pull the cotton and if it is oily on the part that went inside or oil comes out I know it is inside the plate and not coming from above. Since the inspection plate only has 4 bolts it is easy to remove and lok to see what is going on. And I also check the pan bolts regulary as they seem to tend to want to loosen some. Only found one leak at a valve cover.
Ron
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08-14-2014, 06:34 AM
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Join Date: Nov 1999
Location: Brisbane, Australia,
Q
Cobra Make, Engine: Contemporary CCX3117 427FE
Posts: 4,381
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Stephan, at risk of asking the obvious, is it definitely engine oil and not trans fluid? New TKO600s have been known to leak out of the bellhousing. It comes from the unsealed threads that mount the throwout bearing.
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Craig
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08-14-2014, 09:05 AM
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Join Date: Jul 2014
Cobra Make, Engine: ERA
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How many miles on the engine? If it's new I'd suspect (like others have pointed out) valve covers or intake. That cork gasket at the back end of the intake. The bell housing could be dry and it's running down between the joints between the block, block plate and bell housing.
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08-14-2014, 09:00 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Quote:
Originally Posted by tcabece427
How many miles on the engine? If it's new I'd suspect (like others have pointed out) valve covers or intake. That cork gasket at the back end of the intake. The bell housing could be dry and it's running down between the joints between the block, block plate and bell housing.
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I had the same symptom a couple of years ago. Ended up being a failed intake gasket.
Another common one is the oil pressure line leaking and blowing back.
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Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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08-15-2014, 02:43 AM
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CC Member
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Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
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Get a dye kit
Stephan427SC Bingo2 has it right, get a dye kit and run the motor. In 10 minutes or short drive you will find the leak location. If you look up threads with oil leaks they come from any direction. Kit is about $50.00. Napa has them and some other stores. They also have dye for coolant leaks, trans leaks, rearend, a/c, and P/S system. Yellow glasses look cool too.  Save alot of guessing. Good luck, I's betting on rear main seal or side seals on back cap at top between block and cap. Rick L. |
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