Question about Cars & Trucks
There are two TDC's, TDC of the compression stroke, both cam lobes will be up, away from the valves. On TDC of the exhaust stroke, the exhaust lobe will be just past the exhaust valve, and the intake lobe will just be ready to open the intake valve. See, as the piston rises on the exhaust stroke, the exhaust valve is open. When piston reaches TDC, the exhaust will close, and the intake will be opening as the piston begins downward again. Coming up on the compression stroke, and on up to TDC, both valves remain closed-lobes are away from valves.
Posted on Nov 28, 2013
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Posted on Jan 02, 2017
I'd be careful as you know that is a zero clearance engine. Pull #1 spark plug after you get everything lined back up. Make sure it's all the way up and on the compression stroke. With #1 cam lobe up the valve should be closed and seated in the head. #1 piston should not be interfering with the valve lash. Mark the belt, cam gears, and crank clearly. This way when you pull the belt off, you can line the marks back up at any time and you won't lose any ground. What you can do is to pull the plugs and watch the cam lobes. If you have one going down, and a piston coming up...bingo that's your problem cylinder. Here's a tip from an old timer. Make sure the block timing isn't 180 degrees out. After you mark the belt and gears. Remove the belt and spin the crank 180. This will let you move the cam to close the valve on the problem cylinder while doing it. What you're experiencing is a timing issue. Figure out what that is and then line everything back up and you'll be back on the salt flats in no time. I'd be willing to bet that something is 180 degrees out no more tear down involved, just proper alignment.
Posted on Mar 07, 2010
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