The engine block is combustible gas compression, combustion and expansion of the space. The process of combustion, gas maximum temperature up to 2 ( XK )℃~ 3000~ ℃its inner wall is directly affected by the high temperature and high pressure gas, and the outer wall and the air ( or water ) cooling, the cylinder bear large mechanical stress and thermal stress, so the requirements of cylinder sleeve must have enough strength and rigidity degree, and worked with little distortion. In addition, the cylinder body of the piston movement plays a guiding role in the inner wall of the cylinder piston, except by the side pressure of piston, thought of high-speed movement, so that the cylinder wall are strongly affected by the friction, engine wear the most serious one surface, therefore, require cylinder body must have a certain degree of wear resistance.

One, product performance

This is company production of cylinder body adopts boron cast iron cylinder, double metal casting, with high hardness, good wear resistance, save oil, heat dissipation capability advantages, size precision and shape tolerance has reached more than 7, and honing texture distribution rules, can make the oil film distribution, reciprocating parts lubrication well, oil consumption.

In two, the disassembly of cylinder body

Note: some models may have vehicle dismantling, others need to be unloaded and engine. For the four; mid-range engine, the need to remove the cylinder head assembly, unloading the timing chain guide roller ( type 70, type 100 ) or when the chain guide plate ( 125 ), open the cylinder and body connecting bolt can be pulled out, the cylinder.

For two stroke engine, need to put the exhaust muffler removed ( if the cylinder is provided with an air inlet, the air inlet device simultaneously removed ), and remove the cylinder cover, remove the gas cylinder and the crankcase of the connecting bolt can be pulled out, the cylinder body.

Cylinder mounting in the opposite order, pay attention to:

1 O-rings, seals, the positioning pin must be replaced with new parts.

2 gas tank I coated with oil.

3 the opening of the piston ring position to correct.

4 when the chain do not fall into the crankcase.

Three, cylinder body inspection

1 check the inside diameter of cylinder

Inner diameter dial indicator ( gauge ) measurement in piston pin, direction and the vertical direction, elected in three,, 6 point determination of cylinder bore, in which the maximum value as the cylinder bore of value. If the value has exceeded the limit, should increase or change new boring mill cylinder.

2 check the cylinder face deformation

With straightedge and a thickness gauge to check the cylinder end ( Note: the pad and adhesive traces clean ), if the deformation rate is greater than the limit should grind or replace.