Author Topic: Potential water jacket leak? (Read 3808 times)

Tbone07 · « **on:** October 12, 2016, 11:33:07 PM »

I was tearing apart my engine to replace the center case gasket due to an air leak when I noticed this rust/corrosion mark on the base gasket:

I'm not sure how water got to that point unless the allen head screw on the bottom of the cylinder is leaking?

Hawaiiysr · « **Reply #1 on:** October 13, 2016, 12:51:43 AM »

Looks quite obvious that your lease is there.

Pumashine · « **Reply #2 on:** October 13, 2016, 09:44:24 AM »

Sometimes those holes are too deep. Pete had me put 2 of the Allen screws on each side with lots of sealer. They are supposed to be a tapered thread for sealing but sometimes the shop doing it uses a straight thread.

rablack21 · « **Reply #3 on:** October 13, 2016, 09:55:38 AM »

I believe that's your culprit, Tbone. The evidence reveals a guilty verdict. I'm with Tony. Clean it up and re-install the screw with plenty of good thread sealer.

Tbone07 · « **Reply #4 on:** October 13, 2016, 11:22:12 PM »

Quote from: Pumashine;70135

Sometimes those holes are too deep. Pete had me put 2 of the Allen screws on each side with lots of sealer. They are supposed to be a tapered thread for sealing but sometimes the shop doing it uses a straight thread.

Quote from: rablack21;70136

I believe that's your culprit, Tbone. The evidence reveals a guilty verdict. I'm with Tony. Clean it up and re-install the screw with plenty of good thread sealer.

This is what I figured. Couldn't see the water coming from anywhere else but that screw. It looks to be sealed up pretty nice but i'll check. I just got this cylinder back from Arlan after I had it re-nikasiled.

I'll seal her up really good and see what happens

Pumashine · « **Reply #5 on:** October 13, 2016, 11:38:39 PM »

Quote from: Tbone07;70144

I just got this cylinder back from Arlan after I had it re-nikasiled.

When they replate your cylinder is is run through an acid wash that removes a small amount of Aluminum from the entire cylinder. In other words the holes grew in that process. So they are over sized and just need a little extra sealant.