465 engine timing adjustment steps:
1) Install the timing toothed belt,
2) Check whether the "assembly mark" position of the driving and driven synchronous gears is correct. If the timing is incorrect or suspected to be inaccurate, it shall be adjusted or reassembled and calibrated according to the following rules:
A. When assembling, you can refer to the "flywheel scale" in the observation hole on the transmission housing without installing the spark plug temporarily, and then rotate the flywheel according to the rotation direction of the gasoline engine during normal operation, so that the keyway at the front end of the crankshaft is aligned with the arrow on the inner cover of the toothed belt.
B check whether the piston (near the radiator end) of the first cylinder of the gasoline engine is at the top dead center of the compression stroke, that is, there is a gap between the intake and exhaust valves and the rocker arm. Otherwise, turn the crankshaft for another 360 degrees. At this time, the circular pit on the edge of the driven synchronous gear is marked (with the key).
Opposite) and the arrow on the inner cover of the toothed belt. If it is correct, yes.
C, if found that the position is very different, should be readjusted. And check the tension of the toothed belt, as shown in the figure. Rotate 360 degrees so that the first cylinder is at the top dead center of the exhaust stroke and the fourth cylinder is at the compression stroke.
At the top dead center, one of the two marks on the edge of the driven synchronous gear opposite to the key should be aligned with the "triangle" (or V-shaped) mark on the toothed belt cover. If it is correct, the timing adjustment or assembly is completed.