Kohler KD440

13
12
13a
13b
8
- 23 -
DISASSEMBLY/REASSEMBLY
Alwayscheckthethespringandvalvetomakesuretheyarein
agoodconditions.
Rocker arm cover - Breather ricirculation
Crankcasevaporrecirculationoccursthroughduct4.
Iftheairlterclogs,theincreasedintakevacuumcouldsuckoilthrou-
ghduct4intothecombustionchamber,causingtheenginetooperate
atarunawayrate.Thisispreventedbyvalcuumvalve2which,when
the vacuum increases, overcomes the resistance of spring 3 and
shutstheduct4.
Makesurethatoilplug5iscorrectlyclosed.
Retcover1andtightenrockerarmcoverto10Nm.
Setvalve/rockerarmclearance when theengineiscold:bringpiston
to top dead center on the compression stroke and set clearance at
0.10-0.15mmusingathicknessgauge.Tightenlocknut.
N.B.: Since an automatic decompression device is available on the
exhaustlobe,manualyrotatetheengineuntilthetappetsareat
lowestpoint.
When replacing the rocket arms, position the piston at the bottom
dead centre and tighten the xing screw gradually to adjust the
hydraulictappets.
Whiletightening,makesurethatA tscorrectlyintoB(g.13a).
Theadjustingscrewpinshouldbetightenedto20Nm.
Do not start the engine for approximately 4 hours to allow the
hydraulic tappets to settle completely.
Oncethetappetshavesettled,tightentheboltto10Nm.
KD 225_315_350_400_440 Workshop Manual_cod. ED0053029330_1° ed_ rev.00
Valve/rocker arm clearance ( KD 225-315-350 )
The engines KD 400 and 440 have hydraulic tappets, therefore
no adjustment is required.