当发动机分解检修、正时齿轮记号模糊不清或更换新正时齿轮时,应对配气定时机构进行准确的检查和调整。由于丰收-27、丰收-35和上海-50型拖拉机的配气相位,在气门开启重叠的时间里,都具有进气提前角和排气延迟角相等的特点,而且凸轮轴齿轮均有微调孔装置。因此上述机型的配气定时,可用厚薄规按如下方法进行检查和调整: 1.按规定在机体上安装好气缸盖、摇臂、凸轮轴、挺杆和推杆等零件后,转动凸轮轴,找到一缸进、排气门全关闭的凸轮位置(即凸轮下八字位置)。用厚薄规(0.8～1.0)将一缸进、排气门同时调整到相等 When the engine is decomposed and serviced, the timing gear mark is unclear or a new timing gear is replaced, the timing valve should be checked and adjusted accurately. As the harvest-27, harvest -35 and Shanghai -50 tractor with gas phase, the valve opens overlap in the time, have the intake advance angle and exhaust delay angle equal characteristics, and the camshaft gear has fine-tuning holes Device. Therefore, with the timing of the above models with gas can be used thickness and thickness of the rules as follows: 1. According to the provisions of the body installed cylinder head, rocker arm, camshaft, tappet and putter and other parts, the rotation of the camshaft , To find a cylinder into the exhaust valve fully closed cam position (ie cam eight character position). Thickness gauge (0.8 ~ 1.0) will be a cylinder into the exhaust valve at the same time adjusted to the same