Exhaust Manifold Oil Leak - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 21 (permalink) Old 10-02-2009, 08:38 AM Thread Starter
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Exhaust Manifold Oil Leak

I know theres an oil rife(passageway) near the exhaust ports. Does anyone know how to fix/repair an oil leak at the manifold or know if that area has a tendancy to warp after awhile? I tried replacing the gaskets but that didnt do much it still leaks like a pig. Any responses help Thanks for your time.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #2 of 21 (permalink) Old 10-03-2009, 03:57 AM
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Could be the valve guide seals.

And, the pre-IC engines were known to crack the head because of the large bore required for the fuel injectors. The IC engines had smaller diameter bodies.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


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post #3 of 21 (permalink) Old 10-03-2009, 02:24 PM
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x2. Its either the valve seals, or a cracked head.

1992 W250-P-pump and some extra air, gone, but not forgotten.

2003 SVT Cobra

1984 Chevy K10

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post #4 of 21 (permalink) Old 10-03-2009, 09:35 PM Thread Starter
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Thats a bummer, looks like I need to do some deeper information digging. Thanks guys.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #5 of 21 (permalink) Old 10-04-2009, 10:17 AM Thread Starter
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Has anyone replaced the vavle guide seals themselves or know if thats a fairly easy task to accomplish?

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #6 of 21 (permalink) Old 10-04-2009, 01:43 PM
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Arrow Top-end lube oil flow . . . .

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Originally Posted by BlowinSmoke View Post
I know theres an oil rife(passageway) near the exhaust ports. Does anyone know how to fix/repair an oil leak at the manifold or know if that area has a tendancy to warp after awhile? I tried replacing the gaskets but that didnt do much it still leaks like a pig. Any responses help Thanks for your time.
There are no oil passageways near the exhaust ports of the Cummins head.

For the purposes of lubricating the upper valve-train, engine oil first comes up through the block adjacent to the longest head bolts (on the intake side). There at the block/head interface, the engine oil moves though a passage in the head-gasket over to the bore in the head for the long head-bolts.





At that point, the engine oil moves up through the head flowing around the longest head bolts (those closest to the intake). There, where the rocker arm pedestals meet the head, the oil flows from the head-bolt passage over and into a passage in the rocker-arm pedistal.





From there, the engine oil flows through the pedestal and into the rocker-arm's shaft where it lubricates the rocker-arms. Further, some of the oil flows through a small opening in the top of the rockers where it runs in a small groove over and onto the portion of the rockers that rides the valve stems. That's where the rocker-arm / valve gets lubricated.




- Have you cleaned the engine so as to see the oil flow from the engine?
- Are you able to determine exactly where the oil seems to be coming from (where are you seeing the oil on the engine)?
- Are you talking about an internal oil leak that seems to flow out of the exhaust manifold gaskets?
Are the valve-cover gaskets in good shape?

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post #7 of 21 (permalink) Old 10-04-2009, 11:31 PM Thread Starter
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After cleaning it all off, It showed leaking from the 2nd and 3rd ( If your looking straight at the engine) exhaust manifold ports and also alittle around the same valve covers. I havent taken any of the valve covers off to check their gaskets.

Thanks for the clarification of the oil lubrication

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #8 of 21 (permalink) Old 10-05-2009, 02:51 AM
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If it is the v/c gaskets, most likely they are hardened where they contact the head.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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post #9 of 21 (permalink) Old 10-05-2009, 02:59 AM Thread Starter
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I remembered pictures that I took when the leak first started. Maybe they'll help.
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90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #10 of 21 (permalink) Old 10-05-2009, 03:03 PM
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I would replace the valve covers first. If they have never been done, It could be one of those things that tricks you into thinking it is much more serious, and it only cost about $20 I think for all of mine, and Autozone had them in stock.

1992 W250-P-pump and some extra air, gone, but not forgotten.

2003 SVT Cobra

1984 Chevy K10

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