Where is the decompression of the four-cylinder tractor? No crank. How to adjust the valve? New diesel engine.

At present, multi-cylinder diesel engines generally have no crank port and decompression device. If you want to adjust the valve clearance, first open the cylinder head cover and turn the crankshaft pulley bolt under the fan with the corresponding tool in the random tool. There is a radiator at the front end, and the operating space is really tight. It can only be overcome a little, and it is still operable to find tools.