300Tdi Engine: Renewing Valve Seat Inserts for Improved Performance
ENGINE
OVERHAUL
25
9. Cut valve seat insert using light hand pressure.
CAUTION: Remove the minimum amount
of material necessary to obtain correct
valve seat face.
10. Smear Prussian Blue to seating face of a
correctly ground valve.
11. Insert valve into guide and press it firmly,
without rotating on to seat insert, remove valve.
12. Check that an even line of Prussian Blue has
been transferred to centre of valve seat insert,
continue cutting operation as necessary until
this has been achieved.
13. Upon completion, remove all traces of swarf.
Valve seat inserts - renew
1. Remove original valve seat insert taking care
not to damage cylinder head.
2. Thoroughly clean valve seat insert recess.
3. Heat cylinder head to 65
°
C.
WARNING: Take care when handling hot
cylinder head.
4. Place cylinder head on bed of hand press and
using a suitable mandrel, press replacement
seat insert into recess.
5. Allow cylinder head to air cool.
6. Check that seat insert is seated squarely in
recess.