Re: coolant leak on 1940 120?

Posted by Owen_Dyneto On 2014/3/22 7:53:25

If in fact the leak is from a water pump bolt, I don't recommend just tightening them as some (all?) of the bolts go thru into the water jacket. I'd remove the bolts, coat the threads with gasket shellac or hardening Permatex, and reinstalling. Also, at least on the later pumps, one or more of the bosses on the pump face will have a machined recess - that's for a flat copper washer to seal the bolt head.

Easiest way to service the pump bolts is to first remove the fan - just 4 bolts. When reinstalling the fan, first loosely thread in a short stud to hang the fan in place and align the holes for the other bolts. Then remove the stud and install the last bolt.