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Exhaust manifold repair?

L

Lew Best

Member
Hey yall

I have an old 1841 Ford backhoe; has a 172 (I think) gas engine. Horizontal exhaust according to the parts manual. The Ford part number is 312556. It has a hole burnt in it probably about 1/2 inch diameter. Is there any probability of successfully repairing this? I'll probably just use this machine a few times a year from a few minutes to maybe a couple or 3 hours at a time; IOW no real heavy use. The YT store shows an aftermarket manifold for 148 & Messick wants 260 something for an oem manifold.

If anyone has any ideas on repairing mine successfully or has a good used one you'd sell I'd appreciate it. It fits lotsa tractors it seems; YT store description says " Intake - Exhaust Manifold For 4 cylinder gas engines in NAA, 600, 601, 700, 800, 801, 900, 901, 2000, 4000." and it does include the gaskets in the 148 price.

Thanks!

Lew
 
Go for the new one. You are wasting your time monkeying with trying to fix a burned our one.
Buck and a half and you are good to go replacing a part that is prone to burn out.
 
Go for the new one. You are wasting your time monkeying with trying to fix a burned out one.
Buck and a half and you are good to go replacing a part that is prone to burn out.
 
i've brazed a few over the years with good results...i try to weld in place or bolt manifold to some channel iron or square tubing to prevent warping.
success is going to depend how thin manifold is around hole...needs to be a minimum of 1/8" thick to do any good...grind the thin out and build up with brass.
 
I have been in the engine rebuilding business for years. We use a spray torch which uses a special powder & flux. Those old manifold have been hot & cold so many times that this torch is the only thing I have seen to weld holes or repair the burned out surface & broken ears.I have saved a lot of classic manifolds.Check with your local welding supply he might know someone in your area that can repair. The weld is very easily machined without the barrier hard spots.The torch I use is sold by Maintenance Welding Alloys 949-770-7027.
 

Thanks Earl; I'll check with the welding supply & see if they know of someone with a torch like that.

BCnT thanks for the advice. If I can't find someone with one of those torches I'll try brazing it; the gas tank, etc. is already off & I think I can get to it well enough to clean it up & try brazing it in place; nothing to lose trying! :)

Lew
 
I had an exhaust manifold crack on a 318 dodge engine back in the day.I veed the crack and welded it up with nickel dc rod. The weld held as long as I had the machine. I never heard any rumors that it recracked so I think my repair was successful.
 

Thanks guys; I'll ask around town about getting it welded with nickel rod; also try to get hold of George Md. I'm not a good enough welder to try it myself and have never tried welding with nickel rod.

Lew
 
Check around boneyards in your locale, if you don't want to spend the $. 172 motors are pretty popular in all sorts of machinery, industrial and ag. May also interchange with the other 4 cyl ford motors, I don't know for sure.
 
Check the aftermarket. I'd be surprised if you couldn't find one for about half what OEM wants. There's no need to frig with fixing the old one, that I know. It's hardly rare or unobtainable.
Repairing that stuff with nickle is not cheap but it can be done if there's a good reason.

Rod
 

Thanks RodinNS; I'm going to explore all angles. Aftermarket price I've found so far is $148 (plus shipping of course). I'm just probably not going to use this tractor a lot; maybe a few times a year. Being on retirement income I need to cut corners where I can.

Lew
 
My neighbor has a MM Jetstar and we've brazed his exhaust manifold three times. The repaired areas have held, but it always finds a new spot to burn through.

I wouldn't fool with brazing one of my own, but he is a good neighbor and has helped me with foolish projects, and I learn something new every time we work together.

Paul
 
If cheap and crossed fingers is what you want, braze it. If cheap and fixed is what you want, aftermarket. IF you're stuck, need it now and want it probably fixed well, NiRod will do the job... but there's still an element of mabey involved... and NiRod is not cheap. Last I bought was somewhere around 60 bucks per pound and if you get filling holes in you could go through half a pound or more....
I know 150 bucks is a bunch of money but it'll likely work out cheaper over the long haul.

Rod
 
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