SAFARI

ENGINE2.2LDICOR

Valve Seat Inserts

For removing valve seat inserts from cylinder head

use suitable boring machine. Bore old insert thin

(about 0.5 mm thickness) and then pry it out.

Alternatively use a suitable turning tool to cut an

annular groove into valve seat insert and then pull

it out with a suitable puller. In order to avoid

damaging machined cylinder head mating surface

with crank case, place any soft protective sheet

metal under supports of puller.

Measure valve seat insert bore diameter in cylinder

head.

If boring and prying is done carefully without

damaging valve seat insert bore in cylinder head,

fitment of an over size valve seat insert will not be

necessary.

Re-machined valve seat insert bore in cylinder

head must be exactly at right angle to cylinder

head mating surface with crank case.

All specified dimensions should be strictly

maintained to ensure proper interference of valve

seat insert in its bore.

Clean valve seat insert and its bore in cylinder head

thoroughly.

JUSTBEFOREINSTALLATION

Place valve seat insert in mixture of Methanol and

dry ice for about 20-30 minutes to bring

temperature down to -150 deg. C.

Heat cylinder head to approximately 80 deg. in

hot water bath.

Install valve seat insert in cylinder head bore

quickly by light hammering

Machine valve seat in cylinder head.

Fig. 67

CamShaft Inspection

Check cam shaft run out at 2nd journal by

supporting it on V-block at 1st and 3rd

journal.(Fig.67)

Check cam shaft journal dimensions. Record the

readings.

Carry out visual inspection of cam shaft for:

Overheating of journals, which is indicated by

bluish/ brown colour.

Deep scoring marks on journals and cam lobes

Cracks, which should be checked on a magnetic

crack detector.

Check hardness of cam shaft journals and cam

lobes, it should be 47 HRC