valve lash

DavidLA · Sep 7, 2014

when i adjusted the valve lash on the 3600 they were very loose, .050 plus gaps on them.

i was wondering, it was apparently running this way for a while, none of the valves looked bent, etc.

could running it this way for a long period of time cause something else to wear causing a small knock in the engine?

i cracked each line for the injectors to cause each cylinder to stop firing, and the knock was present at all times. i"m guessing piston slap, or perhaps "all" of the injectors are bad.

old · Sep 7, 2014

Learned decades ago it is better to have to much tappet gap then not enough. Not likely to cause a problem other then maybe running lean due to the valves not opening a wide as they should have

Bern · Sep 7, 2014

Too much lash is not good. It's really hard on valvetrain parts and camshafts. If you let it go long enough, it will destroy the camshaft and lifters.

If I were you, I'd pull the rockershaft off and inspect the underside of the rocker arms. Too much lash has a way of eating away a nice groove in the rocker arms, making a feeler gauge pretty much useless for adjustment.

If you don't want to remove the rockershaft, set a dial indicator on top of your rockerarms and confirm your lash setting that way. If your feeler gauge and dial indicator are way off, you have worn rocker arms that should be replaced.

gford286 · Sep 23, 2014

(quoted from post at 19:57:52 09/07/14) Too much lash is not good. It's really hard on valvetrain parts and camshafts. If you let it go long enough, it will destroy the camshaft and lifters.

If I were you, I'd pull the rockershaft off and inspect the underside of the rocker arms. Too much lash has a way of eating away a nice groove in the rocker arms, making a feeler gauge pretty much useless for adjustment.

If you don't want to remove the rockershaft, set a dial indicator on top of your rockerarms and confirm your lash setting that way. If your feeler gauge and dial indicator are way off, you have worn rocker arms that should be replaced.

What should the valve lash be set at and what is the proper way to do it? can it be done without taking the sheet metal and fuel tank off?

I don't have a shop manual but I think it might be time to get one.

Sean in PA · Sep 23, 2014

(quoted from post at 07:12:11 09/23/14)

What should the valve lash be set at and what is the proper way to do it? can it be done without taking the sheet metal and fuel tank off?

I don't have a shop manual but I think it might be time to get one.

I'm not sure what model tractor you're asking about, but for the 3600 model that was the original subject of this thread, you need to remove the hood panels to remove the rocker cover to adjust the valve lash. On the 65+ tractors the fuel tank is not over top of the engine like it was on the earlier models.

I have never had to do it on an earlier model with the tank over the engine, but from what I've read from others it can be done without removing anything but the rocker cover, although it is a tight squeeze to get it off.

gford286 · Sep 23, 2014

yeah I got a little carried away looking. I have an 56' 860. I forgot this was for a 3600.

thanks for the info though. I think I can do it I was just checking before I tried it.

valve lash

DavidLA

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old

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Bern

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gford286

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Sean in PA

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gford286

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