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EFV-8 Club Forum / General Ford Discussion / Stuck Piston Rings

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Discussion Topic: Stuck Piston Rings

kb's-34

07-12-2016 @ 6:47 PM

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On my 1940 FORD (that smokes a little), I've been told that one cause could be some of the piston rings could be stuck from sitting for a while. Any thoughts out there on a possible quick fix I could try? It's the original motor that had been rebuilt and used very little before sitting for a while before I purchased it. Hoping to not have to pull it out and take it apart.
Ken

shogun1940

07-12-2016 @ 8:01 PM

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Well you could start by loading up thr cylinder with penetrating oil and letting sit for awhile. Before starting it up leave the plugs out and turn it over and force the oil out, well if you figure out which cylinder lets the most fluid leak by the rings.watch for contamination in your oil. As a last resort you can advance the timing and make it ping to shake the rings. I will tell you that most oil burning comes from worn bearings not rings and that you have to take the oil pan down and do a pressurized oil leakage test or plastigage all the bearings.

Drbrown

07-12-2016 @ 9:15 PM

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Similar to shotgun's recommendation, I recall some members here talking about soaking the cylinders with MMO or Seafoam for a while. Regardless, some patient trials/testing may save you a major tear-down.

07-12-2016 @ 9:31 PM

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That "the original motor that had been rebuilt and used very little before sitting for a while before I purchased it." - If I were you, I'd just drive it and and let it free up by itself - its been known to happen. Jumping the gun and tearing into it just because of "a little" smoke is not justified at this time. Get that puppy out on the road and enjoy it....

Is it 'blow-by' smoke out of the crankcase or smoke out of the exhaust? Either or, just drive it and be sure to get it up to good operating temperature - 160 to 180 degrees. If it's true that the engine was rebuilt and used very little, it might not be broken-in yet. Newly rebuilt engines tend to smoke until the rings are seated. Get it out on the highway....

This message was edited by MG on 7-15-16 @ 11:31 AM

kb's-34

07-14-2016 @ 7:12 AM

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Thanks for all the replies about my " Stuck Piston Rings " Will give them a try.
Ken

TomO

07-15-2016 @ 7:02 AM

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A dry / wet compression test will give you some additional knowledge about the rings. Check the compression on a warm engine with all of the plugs removed and then recheck any cylinders with low compression after adding oil to the cylinder. If the compression rises to the same as the average cylinder, the problem is the rings. Adding Marvel Mystery oil to the low cylinders may help free the rings.

If all cylinders are very low, it could be because the rings did not seat. If this is the case, they may still seat.

Tom

supereal

07-15-2016 @ 7:36 AM

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I Agree with TomO. If you don't have proof that the engine was, in fact, rebuilt, it is probable it either wasn't, or done poorly. At our shop we have seen too many of these. Some had rings upside down, or the gaps were not staggered. If the bores were not honed, it is likely the rings will never seat.

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