Auction 446. The work begins.

[JSinMO]

Sounds good. Is Seal all ok with the temperature of the intake?

Good question. Now that you bring it up this may get too hot. Hadn’t thought about it, thank you. I’ll have to read on the tube. If so then I’ll just go with the grey and see how it does.

[Eugen]

The spec I found for it is 150F. But I don't know if the intake gets so hot. I know permatex grey can do more for sure.

[propane1]

I’ve used Seal All on the block, of the engine in my MF7, to stop an oil leak. It was put on years ago. Still not leaking.
Maybe I should not of said that.

Noel

[Eugen]

I’ve used Seal All on the block, of the engine in my MF7, to stop an oil leak. It was put on years ago. Still not leaking.
Maybe I should not of said that.

Noel

Noel, it might make a big difference where on the block is used. Near the head?

My intention was not to say Seal all is not good to be used on the air intake of the Onan engine. I was just wondering about the temperature there, that's all.

[propane1]

No worry’s Eugen. I didn't mean any thing by what I said. I just hope I don’t get a leak there now by what I said.
Ya, so where I put it was down by the drain plug. So not quite as hot there. But you’d not be placing your finger there on the block in that place. It would be hot enough.

Noel

[JSinMO]

The intake basically fell in two so there sure wasn’t much holding it together.

I cleaned up the surfaces and made sure everything would go together easily. I decided to run Permatex grey on it and then go ahead after it cures and put a bead of Seal all over that for insurance. Is it necessary? Probably not but I don’t want to take this apart any time soon! I’d guess the intake probably gets to the upper end of the suggested heat range, but if Noel used it successfully on the lower part of his engine block then I think it will be fine. If nothing else it’ll be another test bed to see how it reacts to heat.

I took a look at the carburetor and thankfully there were no surprises. It actually looks pretty good, passageways we’re all clear. So once all the goo cures I’ll make a couple new gaskets and slap it back together! Hopefully it starts!

[Eugen]

The repair should be fine I think. I'm curious, are those rivets or how is it holding together?

[MattA]

Sometimes adhesives and sealants are not compatible with certain materials or each other and it can cause them to not cure properly. If the permatex gray and seal all don't cure properly together, you can always just use the permatex gray.

[Harry]

I know those manifolds are aluminum. Do you think they could be welded? Harry. PS: Eugen we need a welding icon! There was a cool one on the old CCI site with a welder flipping his hood down and then a bright arc. When VS got the site they got rid of the cool icons.

[JSinMO]

The repair should be fine I think. I'm curious, are those rivets or how is it holding together?

No it doesn’t appear this is riveted. The “nubs” you see in the picture look to be alignment pins and are part of the casting. I question why Onan decided on a two piece intake in the first place. My guess is it came down to money and production time. Probably faster and cheaper to make them that way. It looks to me like the only thing that keeps the halves together it whatever sealant they used during assembly. It sounds like a poor idea to make it that way then I realize it’s been 50 years since they put it together at the factory so I’d say it worked pretty well!


@Harry the mating surface is kinda thin. I’m sure it could be welded but it would take someone with considerably more skill than I have.

I’ve got the intake put back together and the plan now is to reassemble the tractor tomorrow night. I guess we’ll see if I glued it up good enough!