Case 445/M2, Service Manual

Page: 165 / 178

75753
Figure 72
This check shall be performed using the proper tools.
Use a pump to fill with water heated to approx. 90
°
C and 2
to 3 bar pressure.
Replace the cup plugs ( 1 ) if leaks are found, use the proper
beater for their removal/refitting.
Replace the 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 grind 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 TOTAL
C
0,01 / ¯ 50
A B
SECTION 4 − OVERHAUL AND TECHNICAL SPECIFICATIONS E NG I NE S
31
ED. FEBUARY 2003