Diesel engine bearing don't know how to choose a known watching this at 3 o 'clock

Today to share repair diesel generating set, the selection and collocation of work before. Bearing selection and collocation: one, the old bearings if the examination and approval of the bearing quality is good, the size is appropriate, repair the scraping method to correct, apply is in good condition, can use a few long period, but in the diesel engine overhaul, required a change in the bearing. Found in diesel engine repairs or repair, such as bearing is one of the following conditions, will not continue to use. 一个。 Shaft and bearing fit clearance is too large, and unable to adjust. b。 Bearings are crack surface, alloy is shattered or severe scar, and tile burning. c。 Bearing alloy thin at 0. 2mm。 d。 Elastic significant failure, loss of roundness beyond the normal range ( < 0 diesel engine. 07mm） 。 Second, a new bearing quality request. Both ends of bearing should be higher than that of bearing 0. 05mm（ As shown in figure 3 - 83) b。 Bearing no sand holes, muted, crack and negative rough. c。 Anchor point positioning is good. d。 Bearing oil hole for as far as possible, the error must not exceed 0. 5mm。 e. The same pair of bearing the two pieces of thickness of the poor shall not exceed 0. 05mm。 Three matching tests, the new bearing size must change a new bearing, shall, first of all, the main journal and the appearance of connecting rod journal, such as loss of roundness and conical degree back to normal, and then press the crankshaft journal and the journal of actual size to choose and comply with the new bearing. Ordinary crankshaft main journal and the size of the repair of connecting rod journal: and reduce the size of the specification. Diesel engine has 6:0. 25, 0. 50, 0. 75, 1. 00, 1. 25, 1. 50, reduce 0 each. 25 mm for level 1. So, when change to new bearing bush, according to the main journal and existing dimension of connecting rod journal to matching the corresponding bearing shell, specification is the size of the journal, be about to choose standard size bearing, axis neck is reduced, it should be according to the journal of repair with peer bearing shell size. Visible in the bearing when the choice needs pay attention to a lot of ways, must according to oneself the status of the bearing to take a different plan.