Installing dual cooling on first generation yamaha 144mm pump (with open boss)

[BombThreat]

Ive got a pump from a 1990 SN and going to do dual coolin. Normally I drill and tap the boss on the stator section. But being this a super early pump it was drilled for the siphon bilge pump. I was thinking about filling with JB weld but I really dont think tapping that is a good idea. Id be afraid the fitting would fall out and id kill a motor. What have you guys done in the past with success?

 

[deftons56]

Here is a quote from this thread: http://www.x-h2o.com/threads/1136-Modifying-a-pump-for-dual-cooling

On older pumps you can't just drill, tap, and install the 90 degree.
On the older ones you should take it to a welder and get the hole welded up.
Then you can drill and tap the weld.

I've heard of a few people using epoxy to fill the hole and then drilling and tapping that.
Having it welded seems like a much more permanent solution.

 

[BombThreat]

yup i i think that might be the solution.... although anyone work with devcon? also thinkin about maybe molding in a insert?