Re: Don’s 1937 (120) 138CD Deluxe Touring Limo

Posted by TxGoat On 2024/5/8 7:41:42

I would want the engine in running order to check compression.

I'd start and run the engine for about 5 minutes, then shut it down and perform the test. That should give a fair idea of cylinder balance. If significant variation is observed, further testing can be done to determine is the issue is valve related or otherwise. I would obtain a good quality compression tester.
An engine that has not run much recently may have sticky valves or rings or carbon deposits which could lead to false indications of mechanical problems.

Otherwise good valves may leak due to sticky guides, carbon, or improper adjustment.

Piston rings can get sticky and oil rings can clog in engines that have not run regularly. Those issues, along with sticky valves, may clear up if the engine is run on the road with clean oil and fresh gasoline.

Stale gasoline can very quickly gum up rings and valves.