Replacing a Manifold

Johnnykick · Feb 12, 2018

I need to replace the manifold on my 1955 Farmall 100. Someone told me the bolts are made of brass; is that true? Any tips would be appreciated as I don't want to break or strip any of the studs.

gab · Feb 12, 2018

Just a 123 engine isn't it, doubt if it has any bolts, brass or other wise, somebody might have told you to use brass nuts on the studs but doesn't seem necessary to me.

DeltaRed · Feb 12, 2018

In a similar situation,I just use plain steel nuts and a abundant coating of anti-zieze compound.

rustred · Feb 12, 2018

brass nuts used to be used on the chev exhaust pipe to manifold years ago. it was to prevent siezing. but i have never seen them used on these old tractor manifolds. there is nothing from factory on that using brass. make sure u have a flat washer though. usually the nuts have more meat on them than a standard nut. i usually use "never sieze" on my studs.

gene bender · Feb 12, 2018

Over the yrs ive had many off they have brass nuts and the thick washers in the middle. But you don't know whats been done with the engine since its only 60 or so yrs old I would spray some stuff on them wont hurt anything

gene bender · Feb 12, 2018

sorry I was thinking about the A,B and Cs

steve706 · Feb 12, 2018

Never seen brass bolts on any off set Farmall. The 100?s take a grade 5, 3/8-16 x 1 1/4 hex head bolts for the manifold.

BarnyardEngineering · Feb 13, 2018

Easy way to tell: magnet.

It's highly unlikely they're brass, but anything can happen.

I highly recommend having an oxy-acetylene torch on hand to heat the nuts before trying to loosen them. Just the nuts. If they don't come easy, don't pull harder on the wrench. You will twist the stud off. Ask me how I know. Instead, go through multiple heating/cooling cycles with the nut.

mattofvinings · Feb 13, 2018

My free advice is to get some Kroil, and spray it on the bolts every day for a week.

Use a 6 point impact socket and not a 12 pointer.

I try to crack the nut very slightly in either direction of tightening or loosening, cycling between. If I get the slightest relative motion either way I stop and douse it with some more Kroil, because there's now a new path for it to creep into.

If there's no-budgey then its time for the blue wrench to apply some heat, as mentioned.

SadFarmall · Feb 15, 2018

I don't know much about Farmall 100 tractors, but my F12 and Farmall M both have brass nuts on the manifold studs.
SadFarmall

Replacing a Manifold

Johnnykick

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gab

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DeltaRed

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rustred

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gene bender

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gene bender

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steve706

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BarnyardEngineering

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mattofvinings

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SadFarmall

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