Quote:
Originally Posted by v8volvo
Unless it has problems resulting from the apparent sludge (loss of compression or oil pressure, chronic turbo failures, etc), if the engine is healthy otherwise you can probably take some steps to clean it up without taking it apart and save yourself a lot of work and hassle.
A motor oil lab analysis (Blackstone, etc) would also be a good idea if you are concerned about the contents of the oil. Not expensive and it will tell you about the presence of wear metals or any contaminants like coolant or fuel.
If everything checks out well and you just want to get the inside of the engine cleaned up a little, doing a crankcase flush with diesel fuel will get you there, though it's a little tedious to do the repeated oil changes to get the fuel out afterwards.
Tell us a little more about the car and its history, sounds like you have something interesting with a 1988 740 TD. Is it a converted gas car or imported from overseas? Welcome to the forum.
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it started as a 1986 740 TD. Bought it non running 10 miles from the ocean in maine, rustier than anything ive ever seen. I thought it was just rockers and trunk floor that needed replacing, but then on the trailer home, the framerails under the doors fell out because they were so rusty. I got the car home, got the engine running (air in the injectors had to bleed it out) and thought about what to do. at this point I found paperwork in the glovebox that indicated an engine rebuild was done at 190k miles, and the odometer read 256k when I picked it up. eventually I found a rust free 88 740 shell on craigslist, current plan is swapping the d24T into the 88 shell. currently have the motor out and am giving it a quick once over before it goes into the 88. I pulled the valve cover today and saw the camshaft was spotless with no sludge, the only sludge was built up around the oil fill cap because there was a small "shelf" where it could accumulate. gonna pull the oilpan and cylinder head and give it a once over and cleaning, and cant wait to get it into the car!