Onan intake manifold
 

Took the intake manifold to check it. I'm having problems with the engine acting like it's running out of gas, I have to play with the choke to keep it running. I learned the intake manifold is a 2 piece & I am trying to figure out how to get it apart so I can reseal it.

Another pic

those aren't really meant to come apart. if you are concerned that its leaking put it back on the tractor, run the engine and spray starting fluid or carb cleaner around the seam.

Thank you dvogtvpe, I'll give that a try.

They are known to leak. Don is correct, the best thing is to see if it actually is before tearing it apart. There is a rubber seal inside of it. You have to drill the rivets out, pull it apart and silicone it back together, then install new rivets. No gasket available because as Don said, it wasn't meant to be disassembled. :beerchug:

Why not just run a bead of High Temp RTV around the seam.....????:bigthink:

It wouldn't work. If it is leaking, it would be small area and hard to find. The seam should be pretty tight and it's unlikely that it would get in deep enough to seal it. I suppose you could try it, but even if it does work, I doubt it would last long.

Thanks J-Mech, it looks like the gasket was prig ally silicone or it has been resealed before.

if I were to drill one apart I'd try to use screws of some sorts to put it back together. so its easily servicable

I drilled out the rivets on my 982 with the Onan and sealed it up with black high temp Permatex that was rated for use in gas and oil. I used small screws and nuts with lock washers and a dot of locktight on each. Put it all back together with new intake gaskets and carb rebuilt. After that it ran great, just inspect the intake well mine had hairline cracks and I had to make one good one from two bad.

Bob

I'm pulling my hair out, I can't seem to get the throttle linkage back on right. I must have something backwards, when I hook it up the carb is in WOT position.

Is the dash lever in the idle position? If not, because of the governor, it will be in the WOT position.

Yes the throttle lever is in the idle position

Seems like the governor has moved. The throttle return spring will hold the throttle closed until I try to hook up the throttle linkage, that puts it in WOT. I'm pretty sure I'm going back the same way it came off but I'm missing something.

There is not throttle return spring. Post a pic.

The spring is on the linkage from the carb to the governor.

That picture is not helpful.... try again from a different angle.

Looks like your missing the plastic bushing at the carb for the linkage.... but yes, that little spring can hold the throttle plate open. When it starts the governor will shut the throttle plate.

When I put the intake back on & started it, it ran WOT. No throttle control at all. The linkage has a "S" on the carb end that hooks to the throttle plate.

Another pic

The linkage

That linkage doesn't look right. What model tractor is this?

There should be something taking up the size difference in the hole on the governor arm and the linkage and the same at the carb.......

It's a 1987 2072, the engine is a Linamar, the carb is a Nikki

I'm not sure what happened but the linkage is working right now. I checked the intake & it is not leaking. I still have the problem of having to run the choke almost closed for it to run right. The carb has no adjustments on it other than idle speed.