75753
Figure 72
This check shall be performed using the proper tools.
Use a pump to fill with water heated to approx. 90°Cand2
to 3 bar pressure.
Replace t he cup plugs (1) if leaks are foun d, use t he proper
beater for their removal/refitting.
Replace t he cylinder head if leaks are found.
Checking cylinder head wet seal
!
Before refitting, smear the plug surfaces with
water−repellent sealant.
Checking cylinder head supporting surface
Distortion found along the whole cylinder head shall not
exceed 0.20 mm.
If higher values are found gr ind the cylinder head according
to values and indications shown in the following figure.
75756
Figure 73
The rated thickness A for the cylinder head is 95 ± 0.25 mm,
max. metal removal shall not exceed thickness B by 1 mm.
!
After grinding, check valve sinking. Regrind the valve
seats, if required, to obtain the specified value.
1
0,4
C
D
0,025 / ¯ 25,4
0,4
TOT AL
C
0,01 / ¯ 50
AB
SECTION 4 − OVERHAUL AND TECHNICAL SPECIFICATIONS E NG I NE S
31
ED. FEBUARY 2003
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