Exhaust elbow

[GrotenhuisCubs]

Any suggestions on getting the threaded elbow out of the block without wrecking anything? I tried heating it up but that hasn't worked so far. Any majic methods you guys have used?

[J-Mech]

Good luck is all I'll say. And don't take it out unless there is good reason..... like it needs switched to a different style. Most often you break them. Leave it in unless absolutely necessary to pull it.

[GrotenhuisCubs]

Darn it Jonathan that's not what I wanted to hear! Lol! I thought you would say flip this magic switch and it will come right out! Lol

[J-Mech]

Sorry man. Incidentally, did you price new ones?

[Alvy]

Is yours damaged or are you changing to a stack or something? As stated they are a pain but with a lot of patience you can get them out with soaking every day for a week or so with penetrating oil and I got some of mine with constant down pressure with a pipe wrench and smacking different directions lightly with a rubber hammer. I took an old one I had laying around and cut some flutes in it and used as a sort of tap afterwards to clean out the threads. (Got that from someone on here can't remember but it worked well).i would imagine worse case scenario would be to cut it off leaving a little protruding and cut slits inside it and use a chisel to break the pieces out but you have to be super careful of the threads. Those tjings grow together sometimes because of various reasons.

Also, what were you heating? If you heat the pipe it will expand and you don't want that. Were you heating the head around where the pipe goes in?

[GrotenhuisCubs]

Yeah I'm trying to put the two bolt flange style on for the Midwest stack for pulling but I realize I might not get that lucky. I heated it up and then let it cool before I tried taking it out in hopes of getting lucky but obviously that didn't take and that's why I'm asking for suggestions!

[dvogtvpe]

big pipe wrench and a big hammer. usually they come out

[PaulS]

Try your best not to damage that elbow. They are outrageously expensive if you can find one. I dressed the threads in the block using a pipe nipple that I cut grooves in the threads and it worked. You do have to go very slowly on the threads because I was cautioned that just using brute force can crack the block. Remember that area gets a heat treatment each time the engine is run so it can be a real job to get that elbow out. I used a lot of penetrating fluid and about a weeks time. Also be sure to vacuum out the hole once the threads are fixed up to remove any debris.

[GrotenhuisCubs]

Thanks guys I'm going to try again once the motor is mounted tight again. Don how aggressive can I get before worrying about cracking the block? I know in your building experience you have run into this!

[J-Mech]

I've not had a block crack. Usually the elbow just breaks. But, I've not had to pull many off either. Mostly the ones (elbows) I pull are already broken, so I don't care if they break.