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 Post subject: Lesson learned
PostPosted: Wed Aug 04, 2021 1:27 pm 
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Joined: Wed Aug 03, 2016 6:57 am
Posts: 50
I haven't started my 29 DeSoto in 2 1/2 years it started ok
let it run for about 15 min started smelling varnish engine quit
pulled carb full of varnish and the engine is now stuck with varnish
engine only has 2000 miles now i have to figure out what to do about
freeing the stuck engine


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 Post subject: Re: Lesson learned
PostPosted: Mon Aug 09, 2021 10:00 pm 
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Joined: Thu Mar 05, 2020 1:56 pm
Posts: 84
And what did the Dr. say? Is it broke or just sick?


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 Post subject: Re: Lesson learned
PostPosted: Thu Aug 12, 2021 8:29 am 
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Joined: Wed May 27, 2020 4:56 am
Posts: 59
Location: maine
Rick;
That's a revolting development no matter what the cause but I don't see how varnish in the fuel could cause the engine to seize. Nasty fuel wouldn't have any effect on the bearings and the cylinders get sprayed with oil from below.
If a piston is stuck there should be a hint of back and forth rotation on the crankshaft. If a bearing is stuck the crank would be locked rock solid. If valves are stuck it would be possible to reverse turn the crank a bit.
Removing the head might be the simplest way to investigate. I would expect some visible scoring in any cylinder that's stuck. If the pistons are somewhere other than fully up or down, pounding on them with a hardwood block that fits the cylinder might break it free but there's a risk of breaking a piston with too hard a hit.
The valves in my 24' were so stuck when I got it that I couldn't turn the crank. a 50%/50% mix of acetone and Dextron ATF freed them up in about an hour. Penetrants are poor lubricants so be sure to wash that brew out with a real lubricant if you get as lucky as I did.
Nat


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