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#2
11-17-2002, 02:57 AM
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The problem is the EGR valve feeding exhaust and the crankcase breathing sending oil fumes back into the engine thru the intake manifold. This combination makes a mess in the intake manifold. Gasoline engines have gasoline in the intake manifold to continuosly clean it. Diesel engines do not.
You will have to clean the mess out and "FIX" the EGR valve. You might have to take the manifold to an automotive machine shop for a HOT tank cleaning. P E H 
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#3
11-17-2002, 06:22 PM
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I was somewhat concerned about the tar like build up on my 300D intake (near the EGR valve) so I did a search of www.mbz.org (when it was alive).
The diesel Doktor himself said that of all the cases where people had gone to the trouble of cleaning out the intake manifold, he had not heard of one case where performance was improved. So unless you have an extreme case, I would leave the manifold alone, and maybe just "fix" the EGR valve. Joe
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#4
11-17-2002, 06:41 PM
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The coked oil in the intake can get pretty thick -- I've heard of the intake ports being almost completely closed off, and on my mechanics "rescue" 740 TD, the crud was over half an inch thick. Greatly reduces air flow, even pressurized.
Best preventative is probably synthetic oil, as it doesn't coke. I would get it cleaned out, as there is some suspicion that bent rods on the 3.0L 603 may be due to chunks of the glassy carbon going down the intake and not crushing enough. I don't see how this could be the case, but hey, anything to prevent a bent rod. Peter
__________________
1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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