Crack in a AS41 case

[Leatherneck]

Not to hijack the thread. Just wanna get some advice on a related problem. I'm planning on doing the same fix for the top of the case. It threw a rod, the hole is maybe two inches wide. No structural damage. Just need to seal it for the oil ciruculating. It's a temp fix, I also plan on welding the alum case that also threw a rod. (Not really having any lock on tightening rods)

A hole, hmm that would be interesting. You have the case split and can get at both sides then it might work. A lot of cleaning and prep, a lot! Then I would grind a lip on both sides so you can overlap, need a good solid not adhesive surface to make something for the JB Weld to lay against while curing. I would go thin, use several layers, expect the worst but hope for the best. See what others say. You got to post pics.

[Marc]

I once used a case that had experienced a thrown #3 rod to build a race engine. The lifter bores were OK, the webbing was a bit torn up but a a few minutes with a pea grinder smoothed out the nastiest gouges. I still had the chunks which had come out of the roof, and had them welded back in place. There was slight warpage at the parting line (may have been caused by welding without the RH half bolted on, or could've just been a result of the original trauma) so I needed to use RTV for a few inches when mating the case.

It still leaked.

I managed to make it through the first night's program without oiling down the track because I noticed it seeping in time to clean it off with carb cleaner and smup a layer of RTV over the area.

For the next week, I had cleaned off all the RTV, roughed up the surface and applied a layer of Marine-Tex (similar to JB Weld)....and it still leaked, but not as badly. Another RTV coating at the track to stay off the mechanical black flag.

This little drama continued for the next few weeks, nothing seemed to totally stop the seepage.

At the six-week scheduled refresh I applied a layer of epoxy on the inside of the roof, and that finally did the trick....although I continued to smear a coat of RTV over it "just in case" for the rest of the season. At the obligatory end-of-season teardown there were a few shaking heads (we'd won the championship with that engine).


In retrospect, I probably would've had results just as good by simply pop-riveting an aluminum sheetmetal patch over the area (with generous use of epoxy or JB Weld)

[JB17Atita]

In retrospect, I probably would've had results just as good by simply pop-riveting an aluminum sheetmetal patch over the area (with generous use of epoxy or JB Weld)

That's my other idea, I intend to do something like that with screws or something that can keep the aluminum sheet in place better than just epoxy.

Thanks for sharing.

I'll get you some pics tomorrow

[JB17Atita]

http://i1235.photobucket.com/albums/ff4 ... 110736.jpg

http://s1235.photobucket.com/user/Jb17M ... 1.jpg.html

This is the offending hole that I intend to cover.

[Leatherneck]

So a update, it has been through hot and cold with no problems, no leaks, no seepage. Happy with this at least. Guys I appreciate the advice and help.