BigTone

Member
What should I use to repair/smooth out the hole
where the exhaust comes through the hood on my M?
It"s beat up probably from years of heat and being
used with the hood not latched properly (I have
fixed this problem). I just want to smooth it out
so when I paint it, it will look a little more
presentable, but its a working tractor so not a huge
deal. Bondo was used before but it"s chipping, is
there a heat resistant bondo or another product that
would fix this? thanks, Anthony
 
I dont think bondo would last anytime at all.Remove the hood,use a couple of body 'dollies' and hammer it smooth.Sand and paint.
 
If you want to fill the hole-then take the hood to an auto body shop, and pay them to weld in a filler patch, and then repair the hood back to its original form.
If all you want is to make the hole more presentable, then have the body shop do that, instead of filling it in. They can grind and file the edges, and prepare the edges for paint. It will be necessary to at least prime the area before you get it back.
I know, from many years in auto body work, that the average home fixer will surely make a mess of it by trying to do it him-self!
 

Bondo will not hold up to alot of heat. They do make high heat epoxies and I think I have seen a high heat type bondo. Depending on how big a job it is JB Weld may work well for you. Apply in thin coats and it can be sanded smooth. Of course like said above the best way would be to cut and patch

Here is a high heat filler type
http://www.adtechplastics.com/pc-18-31-p17-smcr-high-heat-resistant-filler.aspx
 
work the metal back as smooth as you can then lay some soider down sand and paint it will hold up to the heat and vibration
 
If you don't have a small mig, then take it to a body shop as some have suggested. Just have them fill the hole completely in. Then you can make a new hole that is the perfect size and location.
 
Brazing or soldering will work, it takes practice & patience. Brass would stand up a bit better in this situation.
As suggested above the most professional & permanent would be to cut the areas from a donor hood and replace the area with the donor patch.
 
My Super M had a couple slots cut in where the loose muffler and clamp rubbed the hood, maybe 3/16" deep. I traced a circle on the hood big enough to make a fresh hole and cut it out with a sabre saw and cleaned it up with a big 1/2 round file. Bondo ain't gonna work.
 
My M has a skim coat of body filler around the ex pipe hole since the 70's and still has not failed.
Probably was and Evercoat product but not certain.
My paint is a little worse for wear tho.
I don't know if Bondo brand will hold up or not .
 
The trade name Bondo is at the bottom of the list. Evercoat is ok, I use a PPG product as the initial one, Evercoat comes in several formulas, not all of them are to be used on bare metal.
 
Bondo + heat + vibration = failure. Actually Bondo + vibration usually means failure.

braze or Mig donor metal into the area then reshape the hole. Use a JB weld or similar hard epoxy to cover/fill small holes. Sand to contour. paint.

This has all pretty much been said, and I agree.
 
You don't even need heat and vibration.

Bondo on a thin edge like that is going to crack and fall off if you look at it wrong.

First, get a set of body hammers and dollies from harbor freight (<$20) and pound it out as smooth as you can, so you can see what you have.

The easiest "home repair" would be to CAREFULLY make the hole larger, if you can do it without making the hole HUGE.

If you've got a MIG welder you can stitch the cracked metal back together and then file/grind it to shape. You can even do it with a stick welder with 1/16" electrodes and a low enough amp setting, if you're careful. The sheet metal parts on an M are quite thick.

If the tractor has that much sentimental value to you, it will be worth taking the hood to a body shop to have it repaired properly.
 

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