[craigtone]

OK ... I have a 1984 Case 446 with a rebuilt Onan B48 long block from Clark Racing. I got everything back together and under load or past 3/4 throttle, the governor starts hunting. To make a long story short, I have re-wired the entire tractor, replaced the coil, put a NEW carb (selling my rebuilt now), split and re-sealed the intake manifold, replaced and set the points and still the EXACT same symptoms!

The only thing I can think of now is maybe the governor is wore? Does anyone have any ideas? I am at a total loss!

 

[Billygoat]

Look in the tech section and you will find the correct service manual for your engine. The procedure to adjust the governor in in the service manual. Not trying to give you the "short answer", but the manual says it best. Welcome to the site! If you look around you will find the tech section to be the best online for these tractors.

 

[Snotrocket]

Here's the service manual for your engine. It's a large file and may take a minute to load.

http://www.manuals.casecoltingersoll.co ... marked.pdf

The procedure for adjusting your governor is on page 13.

There is also a chart at the beginning of the manual that lists at least a dozen things that could cause a hunting governor that you might want to check.

 

[boomers_influence]

craig
as soon as i saw that you stated Clark Racing,
i saw a BIG red flag.
i have had two customers that were not happy with them.
the local customer bought the engine down with him.

the valves were ground, but had a ton of crud on the stem and inside face.
and the ports were loaded with crud.
the customer had me pull one cyl head.
the way the piston looked it had been run for 20 plus hours???
there were no copper washers on the front cover.
this being said they would not build a dog house for me.
thank you. boomer ( the used onan engine parts guy)

 

[robynrj]

Craig
Look up serv manual as suggested. Be sure length of throttle rod from gov arm to carb is correct length. With eng off...losen 3/8 nut holding ball joint at end of throttle rod from gov arm.....holding rod at idle and throttle lever on dash at wide open....start engine....slowly push throttle rod in hand to increase rpm WATCHING gov arm for smooth, jerkfree movement take rpm up to 3600 range.....watching gov arm for steady movement......then decrease rpm slowly to idle.... repeat 5/6 times up and back........if gov arm is steady, inside parts should be ok.....adjust sensetivty etc as needed per manual.......if question, feel free to ask. Was gearcase cover already mounted when you got block? Bob M