23
DATE
22.12.2003
COMPILER TECO/ATI
REG. CODE
1-5302-467
MODEL N°
50707
DATE OF ISSUE
06-95
REVISION 05
ENDORSED
12
13
VIII
13a
13b
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
through 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 ( 15 LD 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 15 LD 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
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