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Harry Ferguson Tractors Discussion Forum
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Valve Adjustment

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albert betts

09-30-2005 14:19:57




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My operation and mainbtenance and dealer shop manual doesn't give me a good bit of Instruction on adjusting the valves on my TO-20. I guess I'm just missing something some where, does any one have a good web site or just good instruction on valve adjust from the #1 cilinder on to the last in the firing order, Thanks Albert




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Jerry/MT

09-30-2005 14:36:29




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 Re: Valve Adjustment in reply to albert betts, 09-30-2005 14:19:57  
What part are you having a hard time with? My Ferguson Shop Manual has pretty good instructions on page 23. I always set mine hot and running. that what my shop manual says. The trick is to get the idle RPM low enough so that the oil splash doesn't drown you!
I use a plastic pop bottle and a fuel hose hooked directly to the fuel line as an auxillary fuel tank to run the engine. I let it get hot and the loosen the the valve adjuster lock nut and move the feeler gauge back and forth between the valve stem and the adjuster making sure there is a slight drag on the feeler when I tighten it down. It takes some practice, but you'll get the hang of it.

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phil(WA)

10-02-2005 23:03:06




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 Re: Valve Adjustment in reply to Jerry/MT, 09-30-2005 14:36:29  
I can adjust mine when hot using only the gas in the carb. just don't drop a wrench or you are hosed.


Phil(WA)



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albert betts

09-30-2005 19:38:16




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  Valve Adjustment (Jerry/MT) in reply to Jerry/MT, 09-30-2005 14:36:29  
After I get the push rods in place, I take it that I set the #1 cylender at TDC and then set the intake valve clearence at .015,,,what do I have to do next to set the exaust valve clearence and after that the other 3 cylenders,,,I guess I'm lost for instruction after setting the #1 cylender intake valve,,,,Thanks for reading this jiberish,,,Albert



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Jerry/MT

10-01-2005 15:32:09




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 Re: Valve Adjustment (Jerry/MT) in reply to albert betts, 09-30-2005 19:38:16  
Since the 4 cycle engine fires once every two revolutions (720 crankshaft degrees), the cylinder has to be at TDC on the compression stroke when both valves are closed. Since the firing order is 1-3-4-2, crank the engine over 180 crank shaft degrees (or take the distributor cap off and watch the rotor move counter clockwise to the next firing position at 90 degrees of rotation)and set the the #3 cylinder valves. repeat the rotation and set the #4 cylinder valves, etc . When you're done, put the valve cover on, hook up an auxillary fuel supply and get it started and let it warm up. Set the idle speed down as low as you can and then do the hot settings with the engine running.

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gerard

10-01-2005 13:04:53




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 Re: Valve Adjustment (Jerry/MT) in reply to albert betts, 09-30-2005 19:38:16  
There's a system that works for most engines:
Work from both ends - when front valve is down, adjust rearmost (#8 on two valve / cylinder four cylinder engines). You'll probably find no 3 valve (from front) is also down, so adjust third from back (#6). Turn engine by hand until all done.
Failing that, and on older engines without quieting ramps on the camshaft, it's possible to use the 'rocking' principle - when both valves are 'rocking' on #1 cyl, adjust both valves on #4. When #2 cyl's valves are rocking, adjust valves on #3 cyl - (working inwards from both ends again).
It's always preferable to do this after a valve job or if pushrods have been swapped about rather than adjusting whilst running, in case you have some valves held open due to lack of clearance.

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