Shoez
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1999 E7 460. I have lots of fuel in the oil. This problem only started after we replaced the heads and rebuilt the jakes.
My mechanic did say that he found a couple of the head bolts around the #4 cylinder on the eup side to have pipe dope on them when he removed them. I have always had a slight oil leak around the back side of #4 eup.
Is this typical or do I have a bigger problem like a cracked block? Any advice would be greatly appreciated.
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Fuel travels through the heads as a return. There are 2 plugs on the top ends of each head. That's the gallery.. the EUP's are fed and returned through the block and sealed by 2 orings.. those galleries, run horizontally. If you look behind the #6 EUP on the back of the block, there are 2 1/4" pipe plugs.. they run all the way to the front. In front one is visible behind the over board breather, the lower one is hidden behind the timing cover.. I have found that one leaking fuel. I always re-seal those 2 front plugs when I do a rebuild. The fuel may be passing by the EUP o-rings. Check fuel pressure. 65-80 is good. Near 100 PSI is a bit high and can cause a leak. Are you sure the head bolts are doped and not the lower exhaust manifold studs. They leak oil and need to be doped.. jojo
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2004 Mack cx613 low power with road speed fault
Shoez replied to Southampton diesel's topic in Engine and Transmission
I had a similar problem with a 2000 CX613. Fault light would come on, truck would reduce speed until fault code reset. Initially just had dealership change settings to Not Reduce Speed with fault code, after which when fault code appeared truck would run as fast 80+ as you were willing to drive it. Eventually we replaced the Speed Sensor wiring harness and the fault codes have not come back. -
I have a 2000 CX613 with a 98 E7 460. I was told when I bought it that it had been ReMacked at 1.1, no paper work available. It is coming up on 1.6M. Since I’ve owned it (11/20) the #4 unit pump has had a slight fuel leak. It has been removed/replaced 3 times. We recently replaced the heads and rebuilt the jakes because of an oil leak where the heads meet. After about 2k miles I noticed my fuel mileage had dropped and I was making oil. It is definitely fuel not water getting in the oil. My mechanic thinks he remembers that the head bolts around #4 cylinder had thread dope on them when he pulled them out. We did not use anything on them when we put them back in. I know when we did the exhaust manifold we used thread dope on those bolts as they thread into the oil galley. It is also listed in a service bulletin. Is there any service bulletin that I missed with regards to the head bolts or do I have a much bigger problem.
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