Guys, doing a motor swap on a 95 D15 B7 and had to swap connecting pipe. Found the closest size o ring from a rebuild kit , slightly lubed new ring and installed tube. Upon block fill up, have a leak at o ring seal at block behind water pump. Should I have greased o ring with o ring grease or installed dry. I did ensure everything was very clean.

Reexamined old o ring from original tube and it did appear to be a bit thicker. Do I install dry, greased with o ring grease, or lube with a drop or two of motor oil....what works the best.....thanks

 

Read this post in my build thread. And yes, you should use the proper OEM o ring, not just whatever you could find laying around.

 

Thanks man, will do. My gasket kit must be a cheapie as no gaskets or o rings are labeled......

 

Eh, or they just assume you'll know what you're looking at, or it wasn't included. My Cometic kit only included one water tube o ring

 

Ok, so I did get the right O ring...it was thicker than the one that leaked, applied a bit of O ring grease and that solved the leak. That was somewhat of a job since the motor was installed and complete. I would suggest to anyone removing/replacing that pipe do a simple fill up the block and check for leaks BEFORE installing the motor. If it does not leak at block fill up , it prolly will not leak under pressure at heat up time. Thanks