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Originally Posted by cjm1219  One concern I did run into was once I filled it up with coolant I had a leak from the thermostat housing. I snugged it down a little more but it was still seeping. Once I ran the car for a few minutes it stopped. I guess the gasket needed to warm up to seal properly. |
My M42 did the same thing when I replaced the water pump- o-ring seeped for a few days after install then stopped and I never had another problem with it. It's not a bad idea to put a thin coat of silicone grease on the o-rings before installing.
While you had it apart, did you happen to notice if the hydraulic tensioner for the drive belt was worn or frozen? That's a part that tends to go over time as well. Easiest way to tell visually if it is bad is that the mounting holes start to elongate and/or the plastic bushing is cracked or broken.