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Discussion Forum
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Stuck valves

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Dave

03-29-2002 01:14:41




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Finally got around to working on my F-20 yesterday.When I got it home last week I noticed engine turned hard so I divided up a qt. of ATF down the sparkplug holes.Turns over real easy now!Too easy it seems. Pulled valve cover to confirm what I expected.All the ex. valves were stuck open.Slathered up everything with Blaster to soak,and every thing else on tractor too.I'm going to keep soaking the valve stems for a couple of days.Think I'll pull off rocker shaft assy.s and with my rubber mallet maybe they might come free.My big plan is to see it run with out tearing it down first.Maybe I'll get really lucky and it will have good oil pressure,compression and won't smoke or leak excessive amounts of oil.Would sure save time&$$$.But I'll go through motor if I have to.Anybody else have same experience?

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Dave

03-29-2002 17:42:08




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 Re: Stuck valves in reply to Dave, 03-29-2002 01:14:41  
Thanks for all the input guys! I just came in from shop,and the valves are un-stuck now. I pulled the rocker shafts and with a bit of conservitave tapping they snapped right shut.So I dosed em up with more PB Blaster {great stuff} to soak some more.I see a problem right away though. One broken spring and two more that look stacked or out of shape somehow.Valves did seat so next move is to inject air into each cylinder and see if they leak.I know about tapping on end of stem to dislodge a piece of crud or carbon that got on the seat.So if I get really lucky again and there is no great amounts of air whistling through this thing I will need some new springs.Probably ought to borrow a spring tester and check even the good looking ones.Could just put a whole new set and not worry about it.Have ordered a service man. but its not here yet.Haven't done any research yet-where would be a good place to get new or even good-used springs? IHC dealer,local NAPA,or get in touch with one of the parts suppliers listed on this site? The bad springs explain why my Uncle told me that the last time he had it running,it was limping and down on power.

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Salvage Man

03-29-2002 07:08:52




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 Re: Stuck valves in reply to Dave, 03-29-2002 01:14:41  
I have been working with my F20 for 3 months spraying and tapping trying to get my exhaust valves unstuck. I finally pulled the head and the guides are junk. The is an old boy here who has run F20 since they were new and he looked at it and told me " You just as well pull the head as your guides are bad".



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F-Dean

03-29-2002 06:05:23




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 Re: Stuck valves in reply to Dave, 03-29-2002 01:14:41  
Dave, I would suggest removing the plugs and turn the engine with another tractor and a "Twisted Belt" while lubricating the exhaust valves. Tapping on the stuck valves should allow you to get them working. I would also suggest taking the lids off the block handholes to verify that each splash trough is getting oil - you can burn out a rod if the distributer in the pan is clogged.



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Larry W.

03-29-2002 06:05:12




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 Re: Stuck valves in reply to Dave, 03-29-2002 01:14:41  
Dave, If you are lucky, and sounds like you are, the valves just got stuck when you turned the engine over by hand. If so, they should loosen up like the engine did. If however, they stopped using the tractor because the engine got hot, and the exhaust valves stuck, then you know the game. I agree, you are on the right track, and it may just be fine. These old engines can take a lot of abuse, and neglect, and keep on ticking. Good luck.

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Michael Soldan

03-29-2002 04:45:51




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 Re: Stuck valves in reply to Dave, 03-29-2002 01:14:41  
Dave, I would agree with what you are doing, ATF has been widely used for valve sticking. "RISOLONE" is a product I have used on a sticking valve but that was on a running engine...an oil additive that is to lube valves, even have put some oil in the gas (Sucking out of a gallon can) to give everything some lube. A rubber hammer might just jar them loose. Are the intakes moving OK? If you do have to pull the head it won't be that bad a job but you will have the expense of a gasket set. It is amazing what lubricants and penetrating oils can do..I hope it works out easiest for you and good luck from Mike in Exeter Ontario

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steve c

03-29-2002 04:37:25




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 Re: Stuck valves in reply to Dave, 03-29-2002 01:14:41  
yes sir, The best is to let it soak and use tranny fluid too. I had a 37 with the same problem. I pulled the tractor around in gear to work up oil pressure in motor before I started it. this one is a hand start. I timed the magneto and it came to live. SteveC



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