In the past few months I have had the water pump backing plate, on at least three occasions develop coolant leaks on my '66 L36. I would have assumed it was a poor quality rebuilt (done by me) but the third leak was a different pump, rebuilt by a professional rebuilder. On initial rebuild the backing plate gasket was installed dry (as I have done in the past with no issues) and subsequent rebuilds were done with a blue RTV and grey RTV from a GM dealer (in combination with the paper gasket).
I use Zerex G05 coolant in this car. First car I have done so, upon reading recommendations from others on the forum. Now I have heard (unsubstantiated), that G05 coolant 'may' undermine some paper gasket material.
There is only so much torque you can achieve with the slotted screw head backing plate retainers.
Before I try this again, has anyone heard anything about G05 not being compatible with certain gasket material?
Joe
I use Zerex G05 coolant in this car. First car I have done so, upon reading recommendations from others on the forum. Now I have heard (unsubstantiated), that G05 coolant 'may' undermine some paper gasket material.
There is only so much torque you can achieve with the slotted screw head backing plate retainers.
Before I try this again, has anyone heard anything about G05 not being compatible with certain gasket material?
Joe
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