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Old 06-14-2007, 09:20 PM
John Plut John Plut is offline
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Join Date: Apr 2001
Location: Joliet Illinois
Posts: 309
Timing Marks

I replaced the head gasket on my '88 260e last weekend so i feel for you. I have the m103 sohc L6 engine - not sure if yours is the same or not.

You need to get everything set to TDC. For my engine there is a mark on the cam and rocker stand that should be aligned. The crankshaft 0 degree mark should then be aligned with the left edge of the crankshaft position sensor mounting plate when viewed from above. Mine was slightly off the mark to begin with but the car ran okay. I was careful that the chain didn't slip when I took off the head. Maybe the sensor mounting was moved (I had it off before) or the chain stretched or something. But the car ran great after I got it back together, and no coolant leak either.

If you can get your hands on a manual for your engine it should describe how to verify TDC.
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