cracked manifold on m

donald schnupper · Nov 14, 2008

Is it better to put a new mamifold on instead of welding it.

Fancy Farm · Nov 14, 2008

Dr. Bert · Nov 14, 2008

Donald: The welding shop I talked to stated that if it is a rusted hole to repair, they would cover it with a mild steel patch and braze it. Didn't ask about cracked manifolds. The welder assured me that patching was permanent fix.

MN Scott · Nov 14, 2008

Brazeing will not work on an exhaust manifold. The intense heat under heavy load will melt it.

mkirsch · Nov 14, 2008

Believe it or not, Mighty Putty is working for us on a large hole in the Super C manifold. I cleaned up around the hole with a wire wheel, and we kneaded up an entire tube of the stuff and made a patch.

It probably won't hold up to a lot of rough handling or heavy work, but it's saving us the $150 on a new manifold as long as the tractor is a shed queen.

Mike Farmer · Nov 15, 2008

I've never had a problem with brazing on manifolds. However I now make a patch from 2mm mild steel and gasweld it (oxy/acetelene) using a low a pressure as possible to minimise the heat spread. I use cast iron rods and a high silicone flux. If I'm out of cast rods I use old piston rings, if you do this they get very hot very quick and they are murder to grind. If possible bolt the manifold in place on an old cylinder head so that it doesn't warp. MTF

james rumph · Nov 15, 2008

If it's just a hole drill and tap that spot for a pipe plug.

"Brazing will not melt off the manifold", the melting point of your alumnium pistons is lower then that of brazing rod.

To braze a crack you first drill a small hole at the end of the crack to stop it from spreading.

The best way to do this is to then put the manifold in a oven and bring the hole piece up to the same temp, then braze or weld it.

Any good welding shop will do this. If you don't want to put it in the kitchen oven then warm the hole piece with a rose bud nice and slow.

Brazing will last a long time.

Dr. Bert · Nov 15, 2008

For MN Scott: The M I am presently working on was used for years to rip and plow Montana sod, pull a baler, feed cattle, etc-- all with a brazed manifold! Finally the cast iron rusted through. At least, brazing worked on one manifold.

george md · Nov 16, 2008

Bert,

Brazing is a good repair, but if you want it to

look better and look like it wasn't repaired ,

o/a and cast iron rod with flux is a much better

repair. I do quite a few manifold repairs and

all with o/a weld.

Below is one that is under way ,it's somewhat

of a disaster , but repairable. Click the link

and there are more pict's of it .

george
<p align="center">

</p>
more picts

george md · Nov 16, 2008

Bert,

Brazing is a good repair, but if you want it to

look better and look like it wasn't repaired ,

o/a and cast iron rod with flux is a much better

repair.Also use a piece of cast for the patch,

bathtub works well, cut the bad metal out and

replace with bathtub .

I do quite a few manifold repairs and

all with o/a weld.

Below is one that is under way ,it's somewhat

of a disaster , but repairable. Click the link

and there are more pict's of it .

george
<p align="center">

</p>
more picts

cracked manifold on m

donald schnupper

Member

Fancy Farm

Member

Dr. Bert

Member

MN Scott

Well-known Member

mkirsch

Well-known Member

Mike Farmer

Member

james rumph

Member

Dr. Bert

Member

george md

Well-known Member

george md

Well-known Member

Similar threads