Re: Overheating-1941 120

Posted by TxGoat On 2025/3/15 10:21:36

Timing is indeed important, as is the proper function of the spark advance mechanism in the distributor. A worn timing chain will affect valve timing as well as the accuracy of the flywheel timing marks relative to the actual distributor rotor position. The gear driving the distributor and oil pump off the camshaft can also wear. Both timing chain and distributor drive gear wear, if present, can be offset by setting the initial timing a few degrees more advanced than specified. That will correct initial timing, but it will not correct valve timing due to timing chain wear. When checking for excessive timing chain wear as suggested above, I would first check for distributor drive gear wear by checking for free play between the distributor shaft and the cam. Be sure you are checking the rotary play at the distributor shaft, and not normal movement in the distributor's advance mechanism. The vacuum advance device, if present, needs to be working properly. Ideally, you'd replace the timing chain, vacuum advance unit, and front crankshaft seal, and have the distributor checked and calibrated on a test machine.