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B 1-1-1
Checking and setting inlet and outlet valve clearance
General
Inlet and outlet valves can definitely only close tightly when a certain clear-
ance is set in the valve drive between the camshaft and the valve shaft.
Valves which do not close tight can lead to burning of the valve seat and the
valve head. On the other hand too much clearance causes considerable
wear. Exact setting and observation of the valve clearance therefore prolongs
the life and increases the operational reliability of the engine.
Check valve clear-
ance
●
Disconnect the injection lines, see work card
●
Remove cylinder head hood.
Example: Engine V16
●
Turn the engine in the direction of rotation until the valves are overlapping
on cylinder A8. Cylinder A 1 is in the upper dead point (OT).
●
Check the valve clearance of cylinder A1 with a feeler gauge. The feeler
gauge must slip between the valve bridge and the toggle lever 8 with low
resistance.
The valve clearance must be reset in case of deviations.
If a large valve clearance was determined, this is due to wear in the valve
drive. Depending on the difference between the actual value and the nominal
value, the valve clearance curve of the cylinder concerned must be monitored
and the cause examined immediately. The actual values must be noted in the
table ”Valve clearance actual values table”. A copy of the table is enclosed.
Tools
-
Normal tools
-
Turning bar
-
2 feeler gauges
References
-
B 7-3-1, Removing and installing injection lines
Only check and set the valve clearance on a cold engine.
Observe the test and setting order.
The engine may only be turned in the direction of rotation. Turning
against the direction of rotation will damage components. Direction of
rotation: Looking onto the drive side – in counterclockwise direction
”left hand rotation”.
Valve
clearance:
Inlet valve
0.3 mm
Outlet valve
0.5 mm
Содержание TBD 616 OEM
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