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Tractor Talk Discussion Forum

How to or not ?

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Ohio Mike

03-07-2006 18:58:46




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Ok here's the deal. Myself and four of my friends was just sitting around talking, ( beleave it or not, about tractors ) LOL ! Anyway somehow the subject about adjusting overhead valves on gas engines came up and to my surprise each had there own way of adjusting valves. So I got to thinking and wanted to see just how many ways people used to do there valves. So how do you say the correct way is ? Kinda makes you think, is my way right or wrong????? ???

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Doc 2

03-07-2006 22:08:03




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 Re: How to or not ? in reply to Ohio Mike, 03-07-2006 18:58:46  
I have used a method for 25+ years that will work on everything from high performance racing engines to antique tractors.

Find the 2 valves for a cylinder, turn the engine over and watch the intake valve. When the intake begins to close, set the exhaust, or ICE. Keep turning the engine watching the exhaust valve and when the exhaust begins to open, set the intake, or EOI.

This method places each lifter at the base circle of the cam and is extremely accurate. It does the same thing as using a degree wheel and dial indicator, but it is all visual and simple. Wtih planning and pracitce you can go down the firing order and get all valves in 2 revolutions of the crank. Also, this method was devised with a dial indicator and degree wheel.

Remember:
I-intake
C-closing
E-exhaust (set exhaust)

E-exhaust
O-opening
I-intake (set intake)

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jdemaris

03-07-2006 19:53:51




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 Re: How to or not ? in reply to Ohio Mike, 03-07-2006 18:58:46  
Methods of, and reasons for, valve lash adjustment used to be a prominent topic of argument back in 20s and 30s. For an engine to run at its best performance, setting by valve lash is NOT the best way - regardless of what your method of doing it is. The valve-lash clearance specs. provided by manufacturers are general specs., general enough to work on all of a particular engine series - regardless of age and/or wear, or variations from engine to engine, etc. When set to the required lash clearance, valve timing will be "close enough", there will be ample clearance for the valves to close, and not so much that they clatter too much. But, the clearance on each valve determines the valve timing. To get optimum performance, valves are usually set with a degree wheel and dial indicator - not a feeler gauge. On a tractor - yeah - who the heck cares - unless maybe you're pulling and every horsepower counts. It was very common with older cars being tuned for performance, and there were books written in argument of optimal valve adjusting. Keep in mind, that generally speaking, excessive clearance makes a valve open late and close early, and too little clearance does the opposite. Setting the lash exactly to specs. will get you within an acceptible range, and that's about it.

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Bob

03-07-2006 19:15:41




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 Re: How to or not ? in reply to Ohio Mike, 03-07-2006 18:58:46  
Well, the main thing is that that cam follower has to be on the "base circle" of the cam, and completely off of the raised part of the cam.

For most common engines, you can use a two-postion method of setting the valves, using two specific camshaft positions, and a chart of which valves to set at each position.

Or, you can set the valves on each cylinder as it comes to TDC, in firing order, which requires nearly 2 turns of the crankshaft to complete all valves of a multi-cylinder engine.

Or, with practice, you can set the valves with the engine running. (If you like spattering oil and making a mess!)

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Chris Jones

03-07-2006 19:05:17




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 Re: How to or not ? in reply to Ohio Mike, 03-07-2006 18:58:46  
Right, wrong, or just different? My neighbor introduced me to sticking the feeler guage between the valve stem and the rocker while the engine is running. Seems to work.



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the tractor vet

03-07-2006 19:30:42




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 Re: How to or not ? in reply to Chris Jones, 03-07-2006 19:05:17  
That will work on SOME ENGINES BUT NOT ALL as on some engines the valve to piston clearance is just what the valve clearance is and you can by doing a engine run set put the valve into the piston so one must know what can and what can not be set running and you never get a good set this way now if ya want to get kinki and get a true set then use a dial indacator and also your valve set and mine will not be the same as to the feel . Like tuning a hemi or a solid lifter on a race engine it can make the differance between being the one thru the lites first or second or that extra two inches at the dead weigth pull . This is something that comes with experince .

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Chris Jones

03-08-2006 06:40:41




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 Re: How to or not ? in reply to the tractor vet, 03-07-2006 19:30:42  
So is my neighbor right, wrong or just different? I humbly suggest that my neighbors way like most ways of doing things is just different. Speaking only for me I trust him. He's been retired several years now and spent the vast majority of his life as a road tractor mechanic for a trucking company.

To the person that mention it was messy. It sure can be! But on my old Allis B at an idle it doesn't throw too much oil.

Would I do this on my car? No, hydraulic lifters--no gap. Thank goodness cause finding the engine under all those wires and hoses could be a problem. :)

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