43
Cleaning
Disassemble the cylinder head. Clean all the parts and
the cylinder block contact surface.
Rust and carbon deposits, etc., must be removed from
the bolt holes and threads in the cylinder block and cyl-
inder head.
Paint and dirt must be removed from cylinder head sur-
faces in contact with bolt heads otherwise there is risk
of leakage and damage to seals and gaskets.
Threads and under bolt heads must be free from nicks,
etc. Renew damaged bolts.
Cylinder heads, pressure-testing
Special tools:
(999) 6579 Lever (or corresponding)
6662 Pressure gauge
6686 Clamp
8077 Cover washer
1.
Connect up the equipment. Lower the cylinder
head into water with temperature approx. 70
°
C.
2.
Connect up pressurized air to the pressure tester.
Open the shut-off tap.
3.
Pull out the reducer valve tap lock ring. Screw in
the tap until pressure reaches 50 kPa (0.5 kp/cm
2
).
Hold this pressure for one minute.
Increase pressure to 150 kPa (1.5 kp/cm
2
). Push in
the lock ring to lock the tap. Close the tap.
After 1–2 minutes check to see if the pressure has
dropped or if air bubbles have formed in the water.
Replace the cylinder head if leaking or damaged.
Pressure-testing
6662
8077
Reducer valve
The tap can be locked
by pushing it in the
direction of the arrow.
6662
5468
Before pressure-testing
A. Connect up pressure tester 6662 to the work-
shop air supply. Adjust pressure to 100 kPa
(1.0 kp/cm
2
) with the reducer valve tap.
B. Close the shut-off tap. No pressure is allowed
to drop during two minutes while reading-off
the pressure gauge.
C. Screw out the reducer valve tap.
