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?