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Old 02-06-2018, 09:43 PM   #1
jhljr44@yahoo.com
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Default stuck 30

For the 110th time. What is the best stuff ti free cylinders?
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Old 02-06-2018, 09:46 PM   #2
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Default Re: stuck 30

money
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Old 02-06-2018, 09:51 PM   #3
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Default Re: stuck 30

The new hot setup seems to be 50/50 mix of ATF and acetone
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Old 02-06-2018, 10:00 PM   #4
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Default Re: stuck 30

Kroil , preferably silikroil ! A thin penetrant works best for me .
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Old 02-06-2018, 10:25 PM   #5
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Default Re: stuck 30

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Originally Posted by Purdy Swoft View Post
Kroil , preferably silikroil ! A thin penetrant works best for me .
Yep. Kroil is purpose-made to free stuck parts due to rust, like a stuck piston & rings. It's a very high quality product and you will find it in shops of professionals that know.

I suggest the non-aerosol version since the Kroil slowly (more than one year) attacks the aerosol can seals and bleeds out the propellants.
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Old 02-07-2018, 12:55 AM   #6
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Default Re: stuck 30

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Originally Posted by 1930-Pickup View Post
Yep. Kroil is purpose-made to free stuck parts due to rust, like a stuck piston & rings. It's a very high quality product and you will find it in shops of professionals that know.

I suggest the non-aerosol version since the Kroil slowly (more than one year) attacks the aerosol can seals and bleeds out the propellants.
I have cans over 10 years old that aren't leaking.
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Old 02-06-2018, 10:07 PM   #7
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Default Re: stuck 30

back with you. Agree with Carl. MMO may be a liquid to start with. Either way let it sit a few days. Take your time. towing may work at some point. At some point you probably will want to remove the head for inspection since you don't know how good the engine was to begin with. Then you could tap the 3 pistons that are not on top dead center with a wooden hammer.

A great story at Hershey during one of the many Rainmaker chili cook-offs came from Karl. Karl had the great plan: find a piston part way down. Replace the start plug with a plug altered to hold a grease fitting. Pump the cylinder full of grease till the engine breaks free. worked. Karl's mistake was that he replaced the spark plugs and fired up the engine in a closed garage!! Black grease was deposited everywhere.
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Old 02-06-2018, 10:25 PM   #8
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Default Re: stuck 30

kroil atf acetone liquid wrench pbblaster all mixed together ought to do something.

Mind you the pistons may not be the stuck culprets as it could be the valve train.
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Old 02-07-2018, 01:04 PM   #9
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Default Re: stuck 30

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Originally Posted by SeaSlugs View Post
kroil atf acetone liquid wrench pbblaster all mixed together ought to do something.

Mind you the pistons may not be the stuck culprets as it could be the valve train.
I agree , more times than not it will be a stuck closed valve. If you can turn the engine backwards even a little it is probably a stuck valve . A good way to make this test is to remove the starter and use a cheater bar on the teeth of the flywheel. remember , the engine turns clockwise when it runs . you want to see if the engine will turn just a little in the counter clockwise direction . I wouldn't remove the head unless it was the VERY last resort . Seeing the tops of the pistons really doesn't tell you much of anything . If it turns out to be a stuck valve , I would remove the manifolds and valve cover. Its pretty easy to spray aerosol sili kroil through the ports to the valve stems . In worse cases I have used vice grips on the lower mushroom end of the valve stem and work it back and fourth while oiling.

Last edited by Purdy Swoft; 02-07-2018 at 01:08 PM. Reason: added info
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Old 02-07-2018, 01:23 PM   #10
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Default Re: stuck 30

Brought home a little 29 Sport coupe that had been sitting since 1964 in an old garage. Motor would not turn in either direction. patiently lubed and waited ! Studied and waited turns out the distributor was locked up. Gently removed distributor dismantled it and rebuilt it engine was fine!
Think "Patience is Mandatory" when tying to solve these issues
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Old 02-08-2018, 04:41 PM   #11
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Default Re: stuck 30

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Originally Posted by SeaSlugs View Post
kroil atf acetone liquid wrench pbblaster all mixed together ought to do something.

Mind you the pistons may not be the stuck culprets as it could be the valve train.
I have not seen if this has been checked yet. I would do as Purdy suggests and there is always the possibility of a jammed bendix, with one stone - 2 birds checked

John

Last edited by aermotor; 02-08-2018 at 05:14 PM.
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Old 02-09-2018, 07:59 AM   #12
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Default Re: stuck 30

I'd pull the starter and use the tool that Tom W posted in a previous thread. I have made two of these and they have been used to easily free up many motors. If the valves are really stuck hard, it can wreck the timing gear, but for what soaking can do, this unit works immediately. Parts vendors now sell a version of this tool, but one can be made from an old starter easily.
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Old 02-06-2018, 10:53 PM   #13
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Default Re: stuck 30

Kerosene also works good and is less expensive .
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Old 02-06-2018, 11:17 PM   #14
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Default Re: stuck 30

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Originally Posted by Purdy Swoft View Post
Kerosene also works good and is less expensive .
Vinegar

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Old 02-07-2018, 11:14 AM   #15
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Default Re: stuck 30

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Vinegar

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Vinegar in the cylinders?
No, no and heck no
Vinegar is way to acidic, will be a pain in the arse to get out, and although it works to remove rust from radiators it would set the stage for flash rusting of the cylinder walls and pistons and any other components it comes in contact with.
Let's stick with the petroleum products for this area
But it's your salad, put on it what you wish.
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Old 02-07-2018, 11:31 AM   #16
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Default Re: stuck 30

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Originally Posted by burner31 View Post
Vinegar in the cylinders?
No, no and heck no
Vinegar is way to acidic, will be a pain in the arse to get out, and although it works to remove rust from radiators it would set the stage for flash rusting of the cylinder walls and pistons and any other components it comes in contact with.
Let's stick with the petroleum products for this area
But it's your salad, put on it what you wish.
You're right it's my salad

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Old 02-07-2018, 11:41 AM   #17
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Default Re: stuck 30

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Originally Posted by Purdy Swoft View Post
Kerosene also works good and is less expensive .
I agree, Kerosene.

Pour it in and let it sit.

Make sure you change the oil after your done freeing it up.
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Old 02-07-2018, 09:56 AM   #18
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Default Re: stuck 30

I've used diesel fuel w/good results.
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Old 02-07-2018, 11:37 AM   #19
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Default Re: stuck 30

I put MMO in the cylinders and let it sit for 2 weeks, then put the car in 2nd gear and gently started to pushed the car back and forth until it broke free.
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Old 02-07-2018, 12:45 PM   #20
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Default Re: stuck 30

I agree . Kerosene seems to be oilier and has very little odor compared to deisel fuel .
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