Where should cam lobes be at TDC?
When cyl is @ TDC, intake & exhaust cam lobes will be leaning towards center (spark plug), and if you have the marks as the TSRM shows, your good to go.
Are any valves open at TDC?
Intake stroke. The piston is now at TDC, both the intake and exhaust valves are partially open. As the piston travels back down the cylinder, the exhaust valve goes fully shut and the intake valve goes fully open and starts to shut.
How do I know if my ignition timing is off?
Symptoms of incorrect ignition timing are poor fuel economy, sluggish acceleration, hard starting, backfiring, or “pinging” or “spark knock”. Too little spark advance will cause low power, bad gas mileage, backfiring, and poor performance. Too much advance will cause hard starting and pre-ignition.
What should the timing marks be on a camshaft?
After you have installed your crankshaft and camshaftand connected the two with your timing set, take a moment to make sure you have your cam installed “straight up,” which means the tick marks on the timing gears point toward each other. At this point, the camshaft should be installed as your cam manufacturer intended.
Is it possible to spot check cam timing?
If you’ve ever installed a set of cams, did your best to line up the marks, and then stood back and scratched your head wondering if they’re right, this article is written for you. Sometimes cam marks leave room for interpretation.
How can you tell the timing of a cam bow?
Here is a piece of orange D-loop material stretched between two timing holes in the cam of this single-cam bow, and then extended straight out from those holes. You can tell the cam’s timing is right because the orange rope is parallel to the bowstring.
Where do you put the timing mark on a car?
The pointer is worth making permanent as it makes a super-accurate ignition timing mark, so use a strip of metal or really stout wire. The pointer needs to be as close as possible to the pulley edge to avoid parallax viewing error, and where it can be seen with the engine in the car. With the timing gears fitted ‘dot-to-dot’.