Rocker Arm Cover - Breather Ricirculation; Valve/Rocker Arm Clearance (Kd 225-315-350); The Engines Kd 400 And 440 Have Hydraulic Tappets, Therefore No Adjustment Is Required; Do Not Start The Engine For Approximately 4 Hours To Allow The Hydraulic Tappets To Settle Completely - Kohler KD225 Workshop Manual

12
13
13a
13b
KD 225_315_350_400_440 Workshop Manual_cod. ED0053029330_1° ed_ rev. 00
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 filter 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.
Refit cover 1 and tighten rocker arm cover to 10 Nm.
Valve/rocker arm clearance ( KD 225-315-350 )
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.
The engines KD 400 and 440 have hydraulic tappets, therefore
no adjustment is required.
When replacing the rocket arms, position the piston at the bottom
dead centre and tighten the fixing screw gradually to adjust the
hydraulic tappets.
While tightening, make sure that A fits correctly into B (fig. 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.
DISASSEMBLY/REASSEMBLY
8
- 23 -