Valve seat inserts - renew

NOTE: Cylinder head and valve guides must be at room temperature when fitting guides.

4. Locate valve guide in valve guide bore with identification groove(s) towards valve seat; position depth gauge:- K8 - Use depth gauge 18G 1576-4. K16 - Use depth gauge 18G 1576-2.
5. Position nylon guide 18G 1576-3 in cylinder head, press guide into bore using driver 18G 1576-1 until depth gauge contacts top of valve guide bore.

6. Check fitted height A of valve guide:- K8 = 10.3 mm K16 = 6.0 mm

Valve seat inserts - renew

CAUTION: Triple angle valve seat inserts have been introduced on later K16 engines; these inserts are not interchangeable with those fitted to early engines. Commencing engine numbers for engines fitted with the new inserts are listed in Information.

1. Renew valve seat inserts as necessary.

CAUTION: Do not damage counterbore when removing insert.

2. Cool replacement valve seat inserts using liquid nitrogen and press into cylinder head in one continuous operation.

CAUTION: Do not heat cylinder head.