Home » Public Forums » GMCnet » Roof A/C out at 104F (of course)
| Re: [GMCnet] Roof A/C out at 104F (of course) [message #318006 is a reply to message #318005] |
Thu, 25 May 2017 11:51   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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The mechanical governor on the Onan N series engine is driven by 10 ball
bearings on inclined ramps located inside the engine on the camshaft gear.
As centrifugal force slings them outward, they travel up the ramps, forcing
a swash plate forward on a shaft. That shaft has a yoke attached to a right
angle shaft that emerges from the camshaft cover, veritcally. It has a
spring loaded belcrank arm swedged onto the yoke shaft. Over the years,
that swedging can become loose, allowing the belcrank arm to move
independently of the shaft. If that is what is happening in your ONAN, it
will cause the governor to "hunt", or cycle slightly faster and slower,
hunting for the spot where spring tension matches governor torque output.
NO AMOUNT OF CARB ADJUSTMENTS, DIFFERENT HOLE PLACEMENT OF THE GOVERNOR
SPRING ON THE BELCRANK ARM, OR ANY OTHER ADJUSTMENTS WILL FIX HUNTING. The
only fix is to re-swedge the end of the yoke shaft, or, if you are feeling
really lucky, sting it with a wire feed welder. But know this. This method
(welding) has been known to cause more problems than it fixes. EZ check
for this is to wiggle the belcrank arm slightly back and forth while
looking at the swedged joint. This should be done with the engine not
running.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On May 25, 2017 9:17 AM, "A." wrote:
> Luvn737s wrote on Thu, 25 May 2017 00:07
>> Yep A/C working, but Onan surging.
>
> There are several causes of Onan surging, in addition to governor linkage
> and spring anomalies there are assorted fuel system possibilities. Do you
> have the Onan 6k manual?
> --
> 73 23' Sequoia 4 Sale
> 73 23' CanyonLands Parts Unit 4 Sale
> Upper Alabama
> "Every day I become more convinced that I am the only person left on the
> planet that recognizes nonsense for what it is."
>
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