© Scania Industrial & Marine Engines
47
21. Every 1,200 hours:
CHECKING/ADJUSTING
VALVE CLEARANCE
Checking/adjusting valve clearance should be done after the
first 400 hours of operation.
Valves should be adjusted when the engine is cold, at least 30 minutes after
running.
Rocker cover gaskets should be changed as necessary. Tightening torque:
25 Nm.
Alternative 1
- Turn the crankshaft in its direction of rotation until the piston in cylinder
No. 1 is 30°after TDC on the combustion stroke. There is a mark,
⊥
, at
this position.
- Adjust the following valves:
Right side
Cyl 1
Intake and exhaust
2
Ex
4
Ex
Left side
Cyl 5
In and ex
7
In
8
In
- Turn the crankshaft one revolution in its direction of rotation to the
⊥
mark. The piston in cylinder No. 1 will then be 30°after TDC on the
induction stroke.
- Adjust the following valves:
Right side
Cyl 2
In
3
In and ex
4
In
Left side
Cyl 6
In and ex
7
Ex
8
Ex
Covers for reading
on flywheel casing
Important.
On silumin housings, reading is possible
only from underneath.
On ductile cast iron housings, reading is
possible from underneath or from the
side (60°), depending on accessibility.
FLYWHEEL
No. 1 cylinder piston 30
°
after
TDC in
Intake valve
Exhaust valve
5
4
3
2
1
6
Cylinder numbering
FLYWHEEL
7
8
induction
stroke
combustion
stroke
WARNING
Immobilise the starting device
when working on the engine.
If the engine starts out of
control, there is a
SERIOUS RISK
OF INJURY.