number one piston

red theo · Dec 29, 2014

I am adjusting valves on a 140 farmall.It says to start with no 1 piston top dead center.Are pistons numbered 1 thru 4 starting at front of tractor?

vscummins · Dec 29, 2014

Yes one at the font closest to radiator 4 at the back

rustred · Dec 29, 2014

yes applies to most engines #1 is at front, but you can start setting valves anyplace you want, as long as you know that its running mate has the valves on the rock.this makes sure the valves you want to adjust are on compression.

David G · Dec 29, 2014

I think you can do half the valves at TDC on #1, then the other half on TDC of #4, others can comment.

red theo · Dec 29, 2014

what do you mean as long as you know its running mate has its valves on the rock?

Steve@Advance · Dec 29, 2014

I've seen a lot of formulas for setting valves with the crank in various positions. Some swear by this method, but I've never trusted myself to get it right.

I always just pull the plugs (to make turning the engine easier), put the feeler gauge in the first rocker and hand turn the engine slowly through until I find the loosest position, lock it down, recheck it just to be sure, then move to the next one.

I also prefer to start it up before putting the cover back on just to give them a listen. If the rockers or head have been disassembled, or it's a fresh start up, I'll let it run a bit, then recheck them again.

vscummins · Dec 29, 2014

Just set at top dead center one do the loose ones roll It over to top dead center number 4 do the loose ones your done . On a little engine like that you could roll each piston up to tdc and do em one at a time to.

rustred · Dec 29, 2014

that means that if you rock the crank back and forth at tdc on compression, the valves will do the same on the running mate. you dont have to pull spark plugs to know where your at.

Bob · Dec 29, 2014

Red Ted, this link to official IH information on valve setting may be of some help. You will have to cut and past.

http://www.cleancomputes.com/Cub/Blue%20Ribbon%20Service%20Manuals/Valve%20Lash%20Adjusting%20Procedure.jpg

60 acre hillside · Dec 30, 2014

On 6 cyl Chevy engines and IHC tractors I adjusted while running. I have a special wrench with a screwdriver in the middle for this job. Wore out several feeler gauges.

ASEguy · Dec 30, 2014

Usually number one is farthest forward. You set that valve at TDC compression then go to the next one in the firing order. Before you set the next one rotate the crankshaft 180 degrees.

john *.?-!.* cub owner · Dec 30, 2014

AS to the location of the #1 cylinder, it is normally on the front, but not always, however, it does appear to always be on the radiator end, such as a rear engine.

Cas · Dec 30, 2014

I have found Steve's method the easiest and best way to do it. Tried the book method and seems to take longer and more cumbersome.

number one piston

red theo

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vscummins

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rustred

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David G

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red theo

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Steve@Advance

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vscummins

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rustred

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Bob

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60 acre hillside

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ASEguy

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john .?-!. cub owner

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Cas

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