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Joined: Aug 2011
Posts: 64
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Aug 2011
Posts: 64 |
Gents, if a valve (intake or exhaust) is stuck open, will the piston hit it?
'30 2dr. Coupe Straight Six
Member #50432
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The valves are set quite deep into the combustion chamber on a 1929-1933 so the will not hit the piston.
Gene Schneider
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
If you have a stuck valve, lubricate the "stem" liberally with WD-40 or your own lube of choice and gently tap on the rocker arm when held down in contact with the valve stem. After a good soaking, and expiration of time, run the engine and continue to apply lubrication.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Sep 2007
Posts: 654 Likes: 3
Oil Can Mechanic
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Oil Can Mechanic
Joined: Sep 2007
Posts: 654 Likes: 3 |
I've used penetrating oil and a rubber hammer with moderate blows on the rockers to free up valves
J Franklin
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Joined: Aug 2011
Posts: 64
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Aug 2011
Posts: 64 |
All good information! Thanks!
Member #50432
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Joined: Dec 2010
Posts: 799
ChatMaster - 750
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ChatMaster - 750
Joined: Dec 2010
Posts: 799 |
Yup..strike the rockers, no order required..PB Blaster or wd40 both good. Loadem up with that stufff...Wait overnite do it again. they do free up
Old cars have always owned me.
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Joined: Apr 2010
Posts: 734 Likes: 14
Oil Can Mechanic
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Oil Can Mechanic
Joined: Apr 2010
Posts: 734 Likes: 14 |
Hello John Cunningham,
Sometimes a stuck valve might have it's valve spring fully compressed and therefore will not move much with mallet blows. If this is the case, both pushing on the valve from inside the cylinder and tapping on the rocker arm are needed. Lower the piston, remove spark plug, fill cylinder with clothes line rope leaving a length out for retrieval. Raise piston to push up valve from inside. Use steady pressure while tapping from above. Another suggestion is to use a tap and die set tap handle to attach to the valve stem and twist and pull up on the valve. This requires having the piston up to keep valve from falling into the cylinder and removing the rocker arm and spring from the valve. Soaking with penetrating oil is key.
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