Valves are stuck open! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 08-09-2001, 10:41 AM
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Valves are stuck open!

My 1989 4.2 has been sitting for a while.......as you know I have not been able to start it.....Well found what the problem is.......a couple valves are stuck open.....And iam am looking for some advice on what to do.....Has anyone heard of these valves getting stuck open......they dont seem to be bent....will know more today .....but for now interested in your advice on a solution. If your on AOL please instant message me at [email protected]
thanks
Bern

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post #2 of (permalink) Old 08-09-2001, 11:18 AM
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Re: Valves are stuck open!

How did you determine valves are stuck open? If you tried turning the engine over then they are now bent.

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post #3 of (permalink) Old 08-09-2001, 10:16 PM
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Re: Valves are stuck open!

I heard somewhere that ATF has good cleaning properties. Someone wrote that their lifters were sticking and someone said to try using the ATF. I think the other solution was to use Marvel Mystery Oil.
If the valves are sticking open, perhaps you could remove the valve cover and pour either the ATF or the Marvel Oil over the valve springs and stems where they go into the valve guides. Let it set for awhile to soak in and see if they close. Maybe things are alittle gummed up.
I have never used either of these products for this purpose so I cannot recommend you do this. I am only telling you what I have heard from other people.
If you go this route, especially with the ATF, I would definetly drain the oilpan and change the oil before starting the engine.
I think the Marvel Mystery oil is an oil additive so read the instructions.

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post #4 of (permalink) Old 08-10-2001, 04:53 AM
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Re: Valves are stuck open!

We always took a small hammer and tapped on the valves to get them to seat up..Not a hard smack, just a steady tap..It'll sound hollow if it's closing...If you get them unstuck, and get it running, then take a dribble atf down the carb. ..That should lube them up for you..

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post #5 of (permalink) Old 08-11-2001, 12:26 AM
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Re: Valves are stuck open!

Hi....Well i pulled the valve cover off and 2 valves are stuck open....I would think that is was from the jeep sitting for 8 mnths and the gas went bad. I will try the ATF tommarow morning, sure hope it frees them up, i would hate to pull the head. Thanks for the input guys....Open to any other tricks
Thanks again
Bern

post #6 of (permalink) Old 08-11-2001, 02:22 AM
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Re: Valves are stuck open!

well i couldnt wait till the morning.......The ATF worked ,alll the valves are closed.........Now do you think i should drain all the gas out of the tank....(theres less than 1/4 of a tank) or you think i could get away with filling it with fresh gas, and adding a fuel additive. Since the YJ sat for 8 months i would think that is the culprit(bad Fuel)Hey thanks for the great advice!!!!!!!!!The $$$$$$$$$ i saved for a head job will go towards some new tires.
thanks again
Bern

post #7 of (permalink) Old 08-11-2001, 02:39 AM
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Re: Valves are stuck open!

Drain the gas? Nope, but I would fill the tank and add "Seafoam" additive to it to clean out the varnish ....

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post #8 of (permalink) Old 08-11-2001, 02:43 AM
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Re: Valves are stuck open!

Hey LEVE you have a plethora(sp.) of information dont you?

I make Half doors, for pics click here http://communities.msn.com/Grimjeepe...halfdoors.msnw
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post #9 of (permalink) Old 08-11-2001, 02:50 AM
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Re: Valves are stuck open!

1. Defination of Plethora to follow:

Pleth"o*ra (?), n. [NL., fr. Gr. , fr. to be or become full. Cf. Pleonasm.]

1. Overfullness; especially, excessive fullness of the blood vessels; repletion; that state of the blood vessels or of the system when the blood exceeds a healthy standard in quantity; hyperæmia; -- opposed to anæmia.

2. State of being overfull; excess; superabundance.

Yes....but it's not what my wife describes me as being "full of."

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post #10 of (permalink) Old 08-11-2001, 03:11 AM
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Re: Valves are stuck open!

you`re too much

I make Half doors, for pics click here http://communities.msn.com/Grimjeepe...halfdoors.msnw
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