ENGINE - K SERIES KV6
REPAIRS 12-3-75
Refit
NOTE: Following front or rear timing belt
refitment, it is possible that after rotating the
engine and positioning the crankshaft pulley to
the 'SAFE' position, the timing marks on the
rear timing gears may be misaligned. This
misalignment is acceptable provided that the
timing belt refitting procedure was carried out
correctly.
1.Clean camshaft gears and mating faces on
camshafts.
CAUTION: If the sintered gears have been
subjected to prolonged oil contamination,
they must be soaked in a solvent bath and
then thoroughly washed in clean solvent
before refitting. Because of the porous
construction of sintered material, oil
impregnated in the gears will emerge and
contaminate the belt.
2.Place gears inverted on a flat surface, with the
locating lugs on the gears positioned as
illustrated.3.Keeping the timing marks aligned, position
timing belt onto gears.
4.Position LRT-12-195 between the gears, turn
centre nut sufficiently to spread drive belt.
5.Invert gears and timing belt and position LRT-
12-175 to camshaft gears.
6.Check that the locating lugs are correctly
aligned and remove LRT-12-195 from between
camshaft gears.
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 12-3-79
9.Ensure rings are free to rotate, position
compression ring gaps A and B at 120° to each
other and away from thrust side. Position oil
control ring gap C and spring gap D at 30° on
opposite side of gudgeon pin axis.
10.Check clearance of each piston ring to its
respective groove.
+ GENERAL DATA, Engine - KV6
Petrol.Reassembly
1.Clean cylinder liners and liner recess in cylinder
block.
2.Lubricate cylinder liner bores, pistons and rings
with clean engine oil, ensure ring gaps are
correctly spaced.
3.Clean bearing shell recesses in connecting
rods and bearing caps.
4.Fit piston ring clamp, LRT-12-204 to each
piston in turn and fit piston to its respective
cylinder liner ensuring that when fitted, arrow
on piston crown will be towards front of engine.
CAUTION: Do not push pistons fully down
bores at this stage.
5.Remove piston ring clamp.
6.Apply a 2.00 mm (0.1 in) thick continuous bead
of sealant, Part No. RTC 3347, around
shoulder of each cylinder liner as shown.
7.Keeping cylinder liner 'square' to cylinder block,
push each liner fully down until shoulder of liner
seats against cylinder block ensuring that the
arrow on the piston is towards front of engine.
8.To prevent cylinder liners from being displaced,
position LRT-12-144 cylinder liner clamps and
secure to cylinder block with cylinder head
bolts. Ensure that feet of clamps do not
protrude over liner bores.
9.Fit crankshaft.
+ ENGINE - K SERIES KV6,
OVERHAUL, Crankshaft.
M12 6839
D
BA
C
M12 6842
ENGINE - K SERIES KV6
OVERHAUL 12-3-85
9. Big-end bearings selection: Select the
required bearing shells from general data.
+ GENERAL DATA, Engine - KV6
Petrol.
10.Ensure all bolt holes are clean and dry.
Remove all traces of thread locking material
from oil pick-up strainer bolt hole and threads of
retaining bolt.
CAUTION: Do not use a tap.
11.Ensure bearing ladder locating dowels are
fitted and dowel holes in bearing ladder are
clean and dry.
12.Check coolant stub pipe in cylinder block for
signs of leakage and corrosion, replace as
necessary. Apply sealant, Part No. STC 50554
to seal replacement pipe to cylinder block.
13.Clean main bearing shell recesses in cylinder
block.
14.Clean crankshaft main bearing and big end
bearing journals. Clean bearing shell locations
in connecting rods and caps.
15.Fit selected main bearing shells, grooved into
cylinder block and plain into bearing ladder.
16.Fit new thrust washers to cylinder block.
17.Position DTI gauge stylus on end of crankshaft
as illustrated, push crankshaft away from DTI,
zero DTI gauge, push crankshaft in the
opposite direction and note reading on gauge.
+ GENERAL DATA, Engine - KV6
Petrol.
CAUTION: If end-float exceeds limits given,
crankshaft must be replaced.Reassembly
1.Fit selected big-end bearing shells to
connecting rods and caps.
2.Lubricate crankshaft journals with clean engine
oil. Hold crankshaft with big end journals
horizontal, lower crankshaft into main bearings.
3.Carefully pull connecting rods into place, fit
connecting rod caps noting that featherways
are on opposite sides; fit and lightly tighten
dowel bolts.
4.Tighten dowel bolts to:
lStage 1 - 20 Nm (15 lbf.ft)
lStage 2 - Further 45°
5.Using a lint free cloth and a suitable cleaning
solvent, clean bearing ladder and mating face
on cylinder block.
6.Apply clean engine oil to crankshaft thrust
washers and fit to bearing ladder with oil
grooves facing outwards.
7.Fit bearing ladder and ensure that all bearing
shells are seated correctly.
8.Noting that longest bolts must be fitted in inner
holes in bearing ladder, fit new bolts and tighten
to:
lStage 1 - 20 Nm (15 lbf.ft)
lStage 2 - Further 90°
9.Using a lint free cloth and a suitable cleaning
solvent, clean mating surfaces on cylinder
block and lower crankcase.
ENGINE - K SERIES KV6
OVERHAUL 12-3-89
13.Using sequence shown, progressively loosen
and remove 8 cylinder head bolts.
14.Remove cylinder head.
CAUTION: Support both ends of cylinder
head on blocks of wood.
15.Remove and discard cylinder head gasket.
CAUTION: Do not rotate crankshaft with RH
cylinder head fitted.
16.Fit cylinder liner clamps LRT-12-144 and
secure with cylinder head bolts.
CAUTION: Ensure that feet of clamps do not
protrude over bores.Refit
1.Clean cylinder head face.
CAUTION: Use suitable gasket removal
spray and a plastic scraper.
2.Remove bolts securing cylinder liner clamps
LRT-12-144 to cylinder block and remove
clamps.
CAUTION: Do not rotate crankshaft.
3.Clean cylinder block face and dowel holes.
4.Clean cylinder head bolts and wipe dry.
5.Lightly lubricate threads and beneath heads of
cylinder head bolts with clean engine oil.
6.Check that fitted height of dowels is between 10
to 11 mm (0.40 to 0.43 in) above cylinder block
top face. Replace dowels if fitted height is
incorrect.
7.Fit new cylinder head gasket onto cylinder
block with the word 'TOP' uppermost.
8.With assistance, fit cylinder head and carefully
position LH inlet to RH inlet manifold.
9.Carefully enter cylinder head bolts, DO NOT
DROP. Screw bolts into place by hand.
ENGINE - K SERIES KV6
OVERHAUL 12-3-93
18.Fit cylinder liner clamps LRT-12-144 and
secure with cylinder head bolts.
CAUTION: Ensure that feet of clamps do not
protrude over bores.
Refit
1.Clean cylinder head face.
CAUTION: Use suitable gasket removal
spray and a plastic scraper.
2.Remove bolts securing cylinder liner clamps
LRT-12-144 to cylinder block and remove
clamps.
CAUTION: Do not rotate crankshaft.
3.Clean cylinder block face, dowels and dowel
holes.
4.Clean cylinder head bolts and wipe dry.
5.Lightly lubricate threads and beneath heads of
cylinder head bolts with clean engine oil.6.Check that fitted height of dowels is between 10
to 11 mm (0.40 to 0.43 in) above cylinder block
top face. Replace dowels if fitted height is
incorrect.
7.Fit new cylinder head gasket onto cylinder
block with the word 'TOP' uppermost.
8.With assistance, fit cylinder head and carefully
position RH inlet to LH inlet manifold.
9.Carefully enter cylinder head bolts, DO NOT
DROP. Screw bolts into place by hand.
10.Using sequence shown, tighten cylinder head
bolts progressively to:
lStage 1 - 25 Nm (18 lbf.ft)
lStage 2 - 25 Nm (18 lbf.ft)
lStage 3 - 25 Nm (18 lbf.ft)
lStage 4 - Further 180°
11.Fit RH camshaft cover gasket.
+ ENGINE - K SERIES KV6, REPAIRS,
Camshaft cover gasket - RH.
12.Remove and discard lower 'O' rings from
injectors.
13.Clean injectors and injector locations in fuel rail.
14.Lubricate new 'O' rings with castor oil and fit to
injectors.
15.Position fuel rail assembly and secure injectors
to inlet manifolds.
ENGINE - K SERIES KV6
12-3-96 OVERHAUL
12.Check end-float of camshafts using a DTI.
+ GENERAL DATA, Engine - KV6
Petrol.
CAUTION: If camshaft end-float exceeds
limits given, repeat check with new
camshaft(s). If end-float is still excessive,
replace cylinder head and camshaft carrier
as an assembly.
13.Using sequence shown, progressively loosen
22 bolts securing camshaft carrier to cylinder
head until valve spring pressure is released
and remove bolts.
14.Remove camshaft carrier.15.Remove camshafts and discard oil seals.
Note: Inlet camshafts are colour coded orange,
exhaust camshafts
16.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.
17.Measure the outside diameter of hydraulic
tappets.
+ GENERAL DATA, Engine - KV6
Petrol.
Note: Measurement must be taken half-way
along tappet body.
18.Using LRT-12-034, and adapter LRT-12-034/1,
compress valve spring, remove 2 collets,
release valve spring and remove LRT-12-034.
19.Remove valve spring cap and valve spring.
20.Remove valve from cylinder head.
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