I followed the book and turned an additional 3/4 turn after the "play" was removed.
My problem is I am getting a backfire now.
Did I turn in too much? not enough?
Thanks.
cold valve adjustment
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- Posts: 2019
- Joined: Wed Oct 13, 2010 12:51 pm
- Location: Northlake, TX
Re: cold valve adjustment
Probably too tight. Common mistake.
Even if done right some lifters don't like that much preload.
Even if done right some lifters don't like that much preload.
157 Corvairs, 5 Ultravans and counting
Northlake, TX
Northlake, TX
- bbodie52
- Corvair of the Month
- Posts: 11909
- Joined: Mon Aug 06, 2012 12:33 pm
- Location: Lake Chatuge Hayesville, NC
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Re: cold valve adjustment
Is the "backfire" firing through the carburetor intakes or through the tailpipes? if an intake valve is adjusted too tight, the intake valve may not be closing completely for the compression stroke. When the spark plug ignites the fuel/air mixture in the combustion chamber, some of the ignition pressure may be leaking back into the intake manifold. If an exhaust valve is adjusted too tight, the ignition that drives the piston down on the power stroke may also be leaking into the exhaust manifold via a leaking valve that cannot fully close.
You may want to readjust them all — using only ½ turn for pre-load to center the piston in each hydraulic lifter. Or you may opt to adjust the valves of a running engine, tightening each rocker just until the tapping sound stops — then slowly adding another ½ turn.
At 18:00 minutes he gets to the initial cold adjustment of the valves...
You may want to readjust them all — using only ½ turn for pre-load to center the piston in each hydraulic lifter. Or you may opt to adjust the valves of a running engine, tightening each rocker just until the tapping sound stops — then slowly adding another ½ turn.
At 18:00 minutes he gets to the initial cold adjustment of the valves...
Brad Bodie
Lake Chatuge, North Carolina
1966 Corvair Corsa Convertible
Lake Chatuge, North Carolina
1966 Corvair Corsa Convertible