3-30
D4 - JEU DES SOUPAPES
CONTRÔLE/RÉGLAGE
Operation to be performed the first time on reaching 500 hours of service, periodically
every 1500 hours of service.
Adjust the valve clearance with the engine cold.
Disassembling/assembling the cover of the head end “1” (Fig. D4).
If the head covers are excessively smeared, wipe and then remove them.
Disassembly:
Remove the engine vent tube “6” (fig. D4/1) from the cover of the cylinders head
“2” (Fig. D4/1).
Unscrew and remove the hollow, hex head screw “3” (fig. D4/1) from the cover of the
cylinders head together with sealing ring “4” (Fig. D4/1).
Remove the head cover “2” (Fig. D4/1).
Assembly:
Clean the sealing surfaces of the cylinder heads and relative cover “2” (Fig. D4/1).
Always replace gasket “5” (fig. D4/1) between the cover of the cylinder head and the head.
Fit the cylinders head cover “2” (Fig. D4/1).
Insert the hollow, hex head screw “3” (Fig. D4/1) with new sealing rings “4” (Fig. D8/1) and
tighten: tightening torque: 30 Nm.
Layout of cylinders and valves (Fig. D4/2)
= suction valve
= discharge valve
= handwheel side
Checking/adjusting the clearance of the valves
Measure the valve clearance between the rocker arm and the valve stem (discharge valve)
or the valves bridge (suction valve) using a thickness gauge (arrow).
The thickness gauge must be able to pass through with slight resistance.
Valve clearance:
suction valve = 0.40 mm
discharge valve = 0.60 mm
To adjust the valve clearance, slacken lock nut “1” (fig. D4/3).
Adjust the valve clearance by turning adjuster screw “2” (Fig. D4/3).
Retighten the lock nut. Tightening torque: 25 Nm.
Check the valve clearance again and correct it if necessary.
D4
D4/1
5
6
2
4
3
D4/2
D4/3
2
1
X
4
3
2
1
To Next Page
Loading...
Need help?
General
