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ENGINE - K SERIES KV6
12-3-6 REPAIRS
7.Using sequence shown, progressively loosen
22 bolts securing camshaft carrier to cylinder
head until valve spring pressure is released
and remove bolts.
8.Release camshaft carrier from dowels and
remove carrier.
9.Remove both camshafts and discard oil seals.
10.Using a stick magnet, remove 12 hydraulic
tappets from cylinder head.
CAUTION: Store hydraulic tappets in their
fitted order and store upright. Maintain
absolute cleanliness when handling
hydraulic tappets. Failure to observe these
precautions can result in engine failure.
11.Clean camshafts and bearing running surfaces
in camshaft carrier and cylinder head.
12.Inspect camshafts and replace camshafts if
scored, pitted or excessively worn.
Note: Camshafts are colour coded - Inlet -
ORANGE; Exhaust - BLUE.Refit
1.Thoroughly clean and lubricate hydraulic
tappets with clean engine oil. Fit hydraulic
tappets to original bores in cylinder head.
2.Ensure that mating faces of camshaft carrier
and cylinder head are clean and dry.
3.Lubricate camshafts and bearing journals with
clean engine oil.
4.Position camshafts in cylinder head with rear
timing gear drive slots in each camshaft facing
towards the centre as shown.
CAUTION: Ensure camshafts are in their
correct fitted locations, camshafts are
colour coded - Inlet - ORANGE, Exhaust -
BLUE.
5.Apply continuous thin beads of sealant, Part
No. STC 4600, to paths on camshaft carrier as
shown. Spread sealant to an even film using a
roller.
Ensure sealant does not enter oil feed holes
or grooves and that assembly is completed
within 20 minutes.

ENGINE - K SERIES KV6
12-3-78 OVERHAUL
2.Cylinder liners have their bore/grade and step
height determined at manufacture. The bore/
grade, red, blue (A) or (B), and step heights V
or Z together with the cylinder liner part number
and colour code are marked on the external
diameter of the cylinder liners. If cylinder(s) are
to be replaced, the replacement liner(s) must
have the same step height as the original
liner(s). Both step heights are available in red
(A) and blue (B) grades of cylinder liners.

+ GENERAL DATA, Engine - KV6
Petrol.
3.Check pistons for distortion and cracks.
NOTE: Piston grades A or B are stamped on
the crown of the piston.
4. Piston diameter check: Measure piston
diameter at right angles to gudgeon pin and 8
mm (0.3 in) from bottom of skirt.

+ GENERAL DATA, Engine - KV6
Petrol.
NOTE: Piston and connecting rods are only
supplied as an assembly.
CAUTION: Ensure pistons are retained with
their respective cylinder liners.
5.Position piston in cylinder liner and measure
clearance 20 mm (0.75 in) from bottom of
cylinder liner.

+ GENERAL DATA, Engine - KV6
Petrol.6. Piston ring gap: Position new top and second
compression piston rings 20 mm (0.75 in) from
top of cylinder bore and measure ring gaps.

+ GENERAL DATA, Engine - KV6
Petrol.
CAUTION: Ensure piston rings are kept
square to liner bore. Retain rings with the
piston fitted to the liner in which they were
checked.
7. Piston rings - refit:Using a suitable expander,
fit oil control spring.
8.With 'TOP' or identification markings to top of
piston, use an expander to fit piston rings in
sequence; oil control, 2nd and top
compression.
NOTE: The second compression ring is
stepped.
M12 6838

ENGINE - K SERIES KV6
OVERHAUL 12-3-97
21.Remove valve stem oil seal using LRT-12-071.
Discard stem seal.
22.Repeat procedure for remaining valves,
keeping components in their fitted order.
Inspect
1.Clean camshafts, bearing running surfaces in
carrier and cylinder head, carrier and cylinder
head mating faces.
2.Inspect camshafts and replace camshafts if
scored, pitted or excessively worn.
3.Position camshafts in cylinder head and place
Plastigauge across each journal.
CAUTION: Ensure camshafts are in their
correct fitted locations. Camshafts are
colour coded - Inlet - Orange; Exhaust -
Blue.
4.Refit camshaft carrier, fit bolts and using
sequence shown, tighten to 10 Nm (7.5 lbf.ft).
Do not rotate camshafts.5.Using the sequence shown, progressively
loosen and remove camshaft carrier bolts.
Release and remove camshaft carrier from
cylinder head.
6.Measure widest part of Plastigauge on each
journal.

+ GENERAL DATA, Engine - KV6
Petrol.
7.If clearance is excessive, fit new camshafts and
repeat check. If clearance is still excessive
renew cylinder head.
8.Remove all traces of Plastigauge using an oily
rag.
9.Clean sealing surfaces of cylinder heads.
Clean inlet and exhaust manifold mating faces.
CAUTION: Do not use a metal scraper.
10.Decarbonise combustion areas of cylinder
heads
11.Blow out all oilways and coolant passages.
12.Check cylinder head for damage, pay particular
attention to sealing faces.
M12 6889
LRT-12-071
mm.025.038.051.076
M12 6887

ENGINE - K SERIES KV6
12-3-100 OVERHAUL
31.Check that fitted height of valve guide, 'A', is
6.00 mm (0.24 in).
32.Check condition of valve seats and existing
valves that are to be re-used.
33.Renew valve seat inserts as necessary.
CAUTION: Do not damage counterbore
when removing insert.
34.Cool replacement valve seat inserts using
liquid nitrogen and press into cylinder head in
one continuous operation.
CAUTION: Do not heat cylinder head.
Inserts must not stand proud of combustion
face on completion of cutting operation.
35.Cut valve seats using a suitable pilot and the
following cutters:
l15° - To cut first angle
l45° - Make final cut and remove any burrs
l60° - To narrow seat and obtain correct
valve seat width
36.Check valve seat width and face angle:
lSeat width - 'A' - Inlet = 1.2 mm (0.05 in);
Exhaust = 1.6 mm (0.06 in)
lValve face angle - 'B' - Inlet and exhaust =
45°
37.Lap each valve to its seat using grinding paste.38.Apply Prussian Blue to valve seat, insert valve
and press it into position several times without
rotating. Remove and check valve for even and
central seating: seating position shown by
Prussian Blue should be in the centre of valve
face: a: High towards stem, increase 60° cut
and restore seat width. b: Low towards edge,
increase 45° cut and restore seat width. Lap
and recheck valve seating.
39.Check valve stem fitted height - 'A'.

+ GENERAL DATA, Engine - KV6
Petrol.
CAUTION: If valve stem fitted height is
above service limit, fit new valve and re-
check. If still over limit, renew valve seat
insert.
40.Clean valve springs and lubricate valves.
Reassembly
1.Lubricate new valve stem oil seals with clean
engine oil.
2.Using tool LRT-12-071 fit new valve stem oil
seals.
3.Fit valves.
M12 7894
A

ENGINE - K SERIES KV6
OVERHAUL 12-3-101
4.Fit spring and spring cap.
5.Position LRT-12-034 and adapter LRT-12-
034/1to spring cap and compress valve spring.
6.Fit collets.
7.Release valve spring and remove tool LRT-12-
034.
8.Using a wooden dowel and mallet, lightly tap
top of each valve two or three times to seat
valves and collets.
9.Thoroughly clean and lubricate hydraulic
tappets with clean engine oil. Fit hydraulic
tappets to original bores in cylinder head.
10.Ensure that mating faces of camshaft carrier
and cylinder head are clean and dry.
11.Lubricate camshafts and bearing journals with
clean engine oil.
12.Position camshafts in cylinder head with rear
timing gear drive slots in each camshaft facing
towards the centre as shown.
CAUTION: Ensure camshafts are in their
correct fitted locations. Camshafts are
colour coded - Inlet - Orange; Exhaust -
Blue.13.Apply continuous thin beads of sealant, Part
No. STC 4600, to paths on camshaft carrier as
shown. Spread sealant to an even film using a
roller.
CAUTION: To avoid contamination,
assembly should be completed immediately
after application of sealant.
14.Position camshaft carrier, fit and progressively
tighten bolts in the sequence shown to 10 Nm
(7.5 lbf.ft).