PRODUCT INFORMATION
INDEX
DATE
Dep. 2
IT-G-E-10-001e G
August 2016
ADJUSTMENT OF GAS AND ETHANOL ENGINE VALVES.
VALVE CLEARANCE
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2. VALVE CLEARANCE
The valve clearance control allows assessment of wear on the contact points between valve and seat.
The operation is explained below.
Valve clearance:
use the caliper to measure the distance between the upper disk face and the mechanized
upper face of the cylinder head.
Evaluation:
the reference value is the initial measurement after 100 hours of operation of the cylinder head. If
this value increases over time by more than 1 mm, the wear should be carefully monitored. If this value
increases by more than 1.5 mm, it indicates excessive wear and the valve and seat should be replaced.
Measurement of valve clearance
The guiding reference values of initial valve clearance are:
Engine / cylinder head
type
Initial reference valve clearance
(+0.3/-0.2) (mm)
Diesel F/SF
Intake Exhaust
52.90 51.90
Gas FG/SFG/HGM240
52.1
Gas HGM420/HGM560
43.6
Valve clearance
Maximum: Initial value + 1.5 mm
5.2.4
4
O&M_2.002211.810_A_10_2016