2 cyl wisc engine on Model 66 baler

Va Gasman · Aug 29, 2012

I pull a NH 66 baler with SH. On saturday I pulled baler out and gassed and lubed it for this week. Started up fine and ran for 5 min. Yesterday I take it to field and try to start and it runs off one cylinder only. So I had it rolled iinstead. Today I start figuring what was wrong. still will start on #1 and run. Switched spark plugs no difference. Looked down into #2 with lite and exhaust valve is wide open and not closing.I had poured in marvel oil just in case last evening. I pushed vlv down with screwdriver and it snapped closed. Runs fine now. What would cause valve to stick open? never had this happen in the last 5 years I have used this machine.

glennster · Aug 29, 2012

Could be some carbon buildup on the valve stem

oldtanker · Aug 29, 2012

AS Glenn says some kind of build up on the stem. Pretty common occurance on all types of engines that may set for a while.

Rick

LMack · Aug 29, 2012

The oil could have drained down during the set up time and you did not run it long enough for the valve stem to get well oiled again. It was also probably open during the set up and had a build up of crud.

Jon Hagen · Aug 30, 2012

Stale gas will stick the exhaust valves. Had it happen to several air cooled engines.

El Toro · Aug 30, 2012

I would squirt some engine oil around those valves if you can get to them when it's not being used. Pour some oil down each cylinder then rotate the engine one revolution. Then pour a little more and reinstall the sparkplugs. Hal

JRSutton · Aug 30, 2012

There's a little valve cover plate on the side of the cylinder (behind the carb) - actually one plate for each cylinder.

Take the appropriate one off (peel off all the old cork gasket and blast it out with compressed air)

Use a light crow bar in the valve spring to gently move the valve. It'll just pop back into place.

rotate the engine a few times to make sure it doesn't stick again - it'll probably be fine after that.

Janicholson · Aug 30, 2012

It could also have had a bit of carbon get between the Tappet and the valve stem opening the valve .002" or so, farther than ever, sticking it in the un-worn goo. Jim

mkirsch · Aug 31, 2012

I think it's the nature of the air-cooled Wisconsin engines. They don't cool quite well enough, get a little hot, and the exhaust valves stick from time to time.

There was an Owatonna self-propelled swather on my grandfather's farm with a 4-cylinder Wisconsin engine. Dad tells stories about that thing constantly having problems with stuck exhaust valves on that thing.

Seems the engine would get a little hot and hang up an exhaust valve. They had fixing it down to a science. IIRC, pop the valve cover, squirt a little oil in, tap-tap-tap, and back to work.

TomA in CA · Sep 1, 2012

My first baler when I was a kid had a V4 wisconsin. It was
always sticking valves. I used to run CD 2 or something thru
the carb. In my old age I am thinking running a good HD oil
might help. I have stayed away from Wisconsins because of
this. I do have a Lincoln welder with one if I ever get it going.

2 cyl wisc engine on Model 66 baler

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Va Gasman

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glennster

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oldtanker

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LMack

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Jon Hagen

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El Toro

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JRSutton

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TomA in CA

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