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E30 M3 CD Owners
Click HERE for Upgrade
and bug fix info.
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Koala Motorsport Inc (440) 564 7574 |
| FRONT
OF YOUR M30 WET
WITH OIL? The M30 6 cylinder is renowned for oil leaks from the front of the engine. Often these leaks also create a false impression of a leaking oil pan or head gasket. Sometimes, these gaskets are leaking also. In order to determine where your leak is, you need to thoroughly clean the front and bottom of the engine, and then run it for some time while watching for leaks. The most common leak on these engines leads people to replace the timing cover gaskets unnecessarily. The leak comes from the larger of the two bolts holding the front crank sensor bracket in place. On the right upper corner of the crank pulley is a magnetic sensor used to read crank position, and on many models, RPM. The sensor is bolted to a small bracket which in turn is bolted to the lower timing case. The two bolts retaining the bracket are different sizes, one is a 6 mm bolt with a 10 mm head, the other is an 8 mm bolt with a 13 mm head. The larger of the two bolts penetrates the timing case, and oil can work its way out the threads, and leak onto the front pulley. The pulley then throws the oil around the front cover, making a mess of everything. This leaves oil sitting in and on all the little crevices and ledges, which just happen to contain gaskets, leaving the impression that the gaskets are leaking. I strongly recommend removing this bolt and sealing its threads with silicone sealer before proceeding any further. If you decide that there are more leaks than this bolt, determine if the problem is the top or bottom cover. If the top cover is leaking, it can be resealed alone. If the bottom cover is leaking, it is considerably easier to do both upper and lower at the same time.
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Koala Motorsport Inc
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