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Garden Tractors Discussion Forum

Re: 1990 316 garden tractor Onan, loping

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11-20-2018 20:51:44

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A COMMON problem with those Onans.

Carb has some clogged passages and/or Welch plug (Key #26) has fallen partially out, or not sealing.

Also, the intake manifold is made in two pieces, and sealed together with silicone rubber. Sometimes, the silicon rubber deteriorates and allows air to leak in an lean out the mixture.

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11-20-2018 22:45:56

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 Re: 1990 316 garden tractor Onan, loping in reply to Bob, 11-20-2018 20:51:44  
Thank you Bob, I'll dig into it. Oh boy, Here we Go! ! Paul

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12-12-2018 13:52:25

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 Re: 1990 316 garden tractor Onan, loping in reply to PMorr, 11-20-2018 22:45:56  
Well, about a month later, all that you gents have mentioned has been cleaned, repaired, adjusted and put back together. All is fine
now. You were all spot on with your comments. Here is what I found: The Carb was working OK but needed a good cleaning. This was done and reassembled with a new gasket kit. The the source of the air leaking, as you said, was the silicone seal of the aluminum manifold halves. I found that the little cast aluminum studs of the lower half (4 of 6) had sheared and not gripping the halves together. The tops of these went through proper sized holes in little flanges on the upper half casting and were peened (sp) over like a tubular rivet. I cleaned up all the stud locations on the flanges, drilled and tapped the 6 spots for 6/32 X 3/8" S.S. panhead machine screws; Reassembled all with Hi-temp Locktite at the screws and Hi-temp silicone along the manifold seams. I let it sit for a day or so waiting for the intake and exhaust tube gaskets to arrive and bolted the carb onto the manifold. It was interesting seeing how much additional "stuff" had to come off to get at the intake manifold itself. The intake Manifold is overlaid with the exhaust system. To get at the bolts for the intake manifold, the exaust piping AND muffler HAS to be removed. to remove the muffler, two bolts behind the front PTO clutch need to be removed. So, the PTO has to be removed. WOW!!!!
Once these are clear, all is wide open to do the repair. Typical destroyed items that were replaced on reassembly were 2 intake manifold gaskets; 2 exh. tube gaskets; and two smallish (1-1/2") U-bolts for the 2 muffler clamps.
She runs like a charm now. Thanks all for your help ! !

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