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Re: 235 first start up issues (stuck valve, weird vacuum oscillation) [Re: Tyler Watts] #1311433 Tue May 21 2019 07:58 PM
Joined: Aug 2003
Posts: 72
T
Tyler Watts Offline OP
Wrench Fetcher
Jerry,

I don't have the equipment on hand to do a leakdown test, but I do have a compression tester. Here are the results (dry test, no oil added):

#1: 0 (obviously, with the exhaust valve stuck open)
#2: 70
#3: 100
#4: 100-105
#5: 100
#6: 95-100

Those readings on 3 through 6 would acceptable for an old engine, right? Perhaps the aberration in #2 is a valve issue? I greatly appreciate your input on this!


1953 Chevrolet 3/4-Ton 3600 Pickup
1946 Fleetline Aerosedan
Re: 235 first start up issues (stuck valve, weird vacuum oscillation) [Re: Tyler Watts] #1311435 Tue May 21 2019 08:43 PM
Joined: Feb 2004
Posts: 18,992
H
Hotrod Lincoln Offline
Boltergeist
All you need to do a leakdown test is an old spark plug and an air compressor. File grind, or hacksaw away the crimp of the steel plug shell so you can knock the porcelain out, and either use a 1/4" pipe tap to to thread the shell for an air line quick-connect, or solder or braze a connector into the shell. Once that adapter is fabricated, just connect an air line to the cylinder with it and apply air pressure with the transmission in high gear and the wheels chocked. You'll need to have both valves closed at the time- - - -the simple way to do that is point the distributor rotor to the cap tower for whatever cylinder you're testing. Listen at the carburetor, the tailpipe, and the oil fill cap to find where the pressure is going. Also, check the radiator for bubbles- - - -indicating a leaky head gasket and/or a cracked head. That test is simple, and it tells you a lot more about the engine condition than a compression test, or even a teardown, sometimes.

Some compression testers have a quick-connect fitting that can be adapted to the air hose. In that case, just take the Schrader valve out of the end of the compression tester hose and you've got a leakdown adapter!
Jerry





The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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