SAFARI

ENGINE

Fig. 8

Fig. 9

Fig. 10

Fig. 11

PRESSURE TESTING OF CYLINDER HEAD

1 Thoroughly de-grease, descale and clean cylinder

head.

2 Firmly screw on steel plate with rubber pads on

cylinder head. Block one outlet of upper cooling line

and connect water hose to other outlet.

3 Connect other end of water hose to a hand operated

water pump dipped in a container of hot water

preferably at 70 deg C to 80 deg C.

4 Test cylinder head for cracks/leakages with water

under a pressure of 5 bar. Fig. 8.

5 Alternatively, dip cylinder head along with sealing

plates in a tank containing water at 70 deg C to

80 deg C and connect hose to a compressed air

line. Pass compressed air at 5 bar and check

cylinder head for leakage/cracks.

6 Replace cylinder head having any cracks.

NOTE :

Do not remove the lower protective sleeve. If it is

removed for any other purpose install it back with new

sealing washer and apply recommended thread locker

and specified torque.

INSPECTION AND REPAIR

1 Check cylinder head surface with a straight edge

and feeler gauge, for unevenness (lengthwise and

crosswise). Fig 9 and 10.

2 If necessary, grind this surface just to clear the

unevenness. Ensure that specified machining

tolerance is not exceeded.

3 In addition to total cylinder head thickness

observe that the water jacket thickness at parting

surfaces must not be less than 6 mm.

4 After reconditioning of parting surfaces by

grinding, measure distance between valve head

and parting surface Fig. 11. Refinish valve seats, if

required.