Volkswagen Type II Transporter 1200 Series Shop Manual page 21

Engine-15
5
3
7
Method and SequenCe for Tightening Cylinder Head Nuts. Second Tightening 23ft/lb.
NOTE: The fitting of valve guides is a specialist job
requzrmg special equipment and therefore is not
recommended.
(5) Check the valve spring against the specifications. If
a spring tester is not available, test by comparison with a
new spring.
TO REF
ACE VALVES AND VALVE SEATS
(I) The valve seats in the cylinder head should be
refaced with a 45° seat cutter when badly pitted or burnt.
NOTE: Only sufficient metal should be removed with the
seat cutter to obtain a concentric seating surface clear of
pits or other damage.
(2) Using a 75° cutter chamfer the lower edge of the
valve seat faces on l200cc engines.
NOTE:
On
1500cc engines the lowet" edge of the exhaust
valve seat insert only should be cut with the 75° cutter.
The lower edge of the inlet valve seat insert should be
chamfered with a 60° cutter.
(3) Using a 15° cutter chamfer the upper edge of both
inlet and exhaust seat inserts.
NOTE: It is essential that the correct seat width is
maintained during the ref acing procedure., The inlet seat
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width should be .051" -.063" and the exhaust seat width
should be .067" -.079".
The seat widths can be narrowed by operations (2) and
(3) and increased by operation (1). The outer edge of the
upper 15° chamfer should not exceed the outer diameter of
the seat insert.
(4) Pitted or burnt valves should be refaced with a
valve refacing machine provided the pitting or burning of
the seat face is not excessive.
NOTE: The valve seat angle for the exhaust valve should be
refaced at 45°, . whereas the inlet valve seat angle should be
44°.
(5) Correctly refaced valves and valve seats should
require very little lapping to obtain accurate seating. Ensure
that the .valve is frequently lifted clear of the seat and
rotated during the lapping operation to avoid grooving the
seat faces.
(6) With the grinding compound thoroughly cleaned
from the valves and seats, check the fit of the valves to the
valve seats.
(7) Smear the valve face with bearing blue and insert
the valve into position, using light hand pressure rotate the
valve a quarter turn only.
(8) Remove the valve and inspect the faces. A correctly
seated valve should have evenly transferred the bearing blue
to the valve seat.