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Persistent leak from the seal between the water pump and the head 700

posted by  rstarkie on  Tue Nov 12 07:54 CST 2019
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last visit: Fri Oct 24 10:14 CST 2014
[RELATED]

1992 740 238K

We purchased this car six years ago. During a major freshening up (4/16) I replaced the water pump with a HEPU pump. The top seal against the head started leaking so I replaced the gasket and seals (1/18). That was good until it started leaking again (9/18) and I again replaced the gasket and seals. It has once again started leaking (always from the seal against the head) and needs my attention.

This is the same water pump I installed in April of 2016. The car has covered 70K since that time. The odd twist on this particular car is that when installing the pump it requires very little upward force to get it into a position to install the bolts that hold it to the block face. Normally as many of you know this can be a real wrestling match to compress that top seal enough to get those bolts started after hanging the pump on the studs.

I am going to install a new HEPU pump this time. I am hoping this solves the problem indicating the cause for this poor fit is because of the current pump. I doubt this is the case, but if it is the problem will be solved.

Does anyone have any suggestions on how to solve this problem if I find that the new pump fits as loose as the previous one? The only thing I have come up with is to put a layer of silicone evenly around the bottom of the groove where this top seal sits and allowing it to cure before moving ahead with the pump installation.

Thanks for any suggestions.

Randy
--
Any twenty minute job is just a broken bolt away from a three day ordeal






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