Keyword: SpiracleThe position

Crankshaftwhen gearWith camshaft when gear is being repaired when assembling, if two when gear all has markers is written down, because the position of gear and crankshaft affects to already was decided by keyway, because this needs only two gear markers writes down alignment to load can. Should discover two when of gear when earmark punch-drunk or when having earmark, if know those who receive exhaust valve to deserve to enrage phasic angle, can use undermentioned method to assemble (this method reachs derv car to volume model all applicable, just measure place and installation method to differ somewhat) .

A magnetic force prepares to express before measure with a dial gauge, will whole photograph distributing gas each join relation and spiracle clearance had been adjusted, crankshaft when gear come away, when assembling, can press list 4 paces to undertake.

1, will the first crockPistonPosition of top dead centre of park exhaust journey. Prize crankshaft flywheel, make on flywheel and flywheel carapace markers writes down a dot to be opposite neat, the fluctuant condition that can observe through arranging hour hand and anticlockwise prize flywheel the first crock takes exhaust valve rocking arm at this moment will decide the first crock of piston is to be in compress top dead centre of journey top dead centre or exhaust journey. Should take exhaust valve rocking arm all when equability, be in namely compress journey top dead centre. Should be in when compressing journey top dead centre, change flying cycle 360 ° , make flywheel and flywheel shine markers writes down a dot to be opposite afresh neat, position of the first crock of piston is exhaust journey top dead centre namely.

2, decide position of the first crock of exhaust valve closes a point. Rotational camshaft when gear, should see the first crock of exhaust valve arrives by open roll stops namely after shutting, express magnetic force lean around exhaust valve, mount dial gauge, touch dial gauge the needle to touch lean on spiracle rocker, turn according to the opposite way when shutting next camshaft when gear, what begin roll when dial gauge is flashy stop roll namely, this is the closed position dot of exhaust valve.

3, when certain exhaust valve is in closed position, the position with corresponding located piston. Because the drive of crankshaft and camshaft is compared,be 2:1, the arc length that so exhaust valve shuts horny place correspondence behindhand is Mm of θ of 720/2 π R (among them R is crankshaft radius, θ horn shuts part behindhand for exhaust valve) , arrange flywheel of hour hand roll right now, make flywheel by exhaust markers writes down a dot to had turned the arc length of Mm of θ of 720/2 π R, at this moment the position when the position with located piston and exhaust valve are shut is relative should.

4, rotational camshaft, make the first crock inlet valve lever and tappet conterminous touch, mount crankshaft when gear, can assure at this moment two when assemble the position correctly of gear.
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