Despite replacing the crankshaft nose seal my 1988 740 wagon is still leaking copiously onto my wife's brick driveway. It would appear to be a result of piston blow by from a 258K motor. I've considered a re-build, but have sourced an re-built engine from Precision Engine Re builders. Does any one have any recommendations regrading engine re-builders? Is it economical to do it oneself?
Comments welcomed Bruin.

 

Since you were in there, I guess you know there are three seals in there...all of which can spew oil. Whether the engine is rebuildable is difficult to determine w/o opening it up and checking the bores. If an overbore is necessary, the cost of boring combined w/ oversize pistons and rings adds hundreds to the rebuild cost. Ditto if the crank and con rods are severely worn. It is extremely difficult to find lower mile good running engines these days. My best advice would be to check the oil pressure and do a compression test on the engine to get a better idea of condition.

 

Thanks for your prompt reply, When I replaced the crankshaft nose oil seal I found a pretty deep groove in the nose of the crank. I did try the grey oil seal which seemed to be softer than the brownish red one.I also moved it along the crank to another hopefully unworn place. All to no avail. I do have a red seal that i might try, but I'm getting good at, but also a little tired of, removing the belts etc. associated with this problem. Hence the request for data on engine re-builders. I love the car, it has tick shift, proper glass headlights and a slightly shabby interior, into which I can put tree branches, bicycles etc. The total cost for a re manufactured engine, including freight and installation, is near $3,500 I'm not sure that this makes economic sense.

Bruin