Diesel engine bearing clearance measurement what method is there?

Diesel engine bearing clearance measurement what method is there? 2021 - 01 - 22 ( Source: the ship machine to help) Feeler gauge method with feeler since the bearing face directly inserted into the measured between shaft and bush. When measuring down the lubricating oil on the bearing cap into the tubing and the tubing inside the cover, insert measurement with feeler from end face. General every 3000 h operation examination. Feeler straight, and bearing clearance is curved, the measured values is less than the actual gap, so the bearing clearance for measuring value add 0. 05 mm revised. This method is simple, but the accuracy is not high and restricted by the bearing structure, can be used as a coarse bearing clearance inspection. Lead method used in bearing clearance of the lead wire after bearing bolt tightening flattened thickness to reflect the actual size of the bearing clearance measurement method. This method is high precision, but the operating trouble, specific steps are as follows: (measurement 1) Down on the main bearing cover and tile or under the big end bearing under cover and tile. ( 2) Choose (diameter 1. 5 ~ 2. 0) △( Delta for bearing assembly clearance) 。 Length of 120 & deg; ~150° 。 Journal of arc length of lead wire 3. First, middle and tail along the axis neck positioning of galvanized iron wire, and butter stick. Plastic and diameter of lead wire had a great influence on measurement accuracy. Lead wire diameter smaller than the bearing clearance, galvanized iron wire has not been crushed, bearing clearance cannot be measured. After the bolt tightening up lead wire diameter is too large, lead wire may be pressed to produce sclerosis pressure into the white metal layer, also can't accurate measurement. For example, the main bearing assembly clearance to 0. 2 to 0. 25 mm, can choose the diameter of 0. 3 to 0. 5 mm galvanized iron wire. ( 3) Installed on the main bearing cover and the tile, to tighten the bolts according to the requirement to specified position, do not turning at this time. ( 4) Open bearing, remove the lead wire is measured and recorded. Pay attention to the position of lead wire the corresponding measure, do not confused. ( 5) The thickness of the lead wire ends and the middle is measured with a micrometer. Middle thickness of bearing clearance value, on both sides on both ends of the thickness of the bearing clearance, should be less than the bearing clearance, and on both sides of the q gap difference less than 0. 05 mm。 Pressure lead method suitable for thick wall bushing bearing clearance inspection. In comparison, high-speed diesel engine main bearing and big end bearing with thin wall bearing shell. Usually adopt inside and outside micrometer, corresponding parts of the bearing diameter measured axis, the second is the difference between the diameter of bearing clearance. Shall generally be measured corresponding to the crank pin on the upper and lower dead point position of shaft, bearing diameter, and the axial first, middle and tail three measurements for comparing the average.