Page 269 of 1007
ENGINE - K SERIES KV6
12-3-92 OVERHAUL
10.Release clip and disconnect coolant bleed
hose from RH inlet manifold, position hose
aside.
11.Release injector harness clips from injector
protection cover - if fitted, or from bosses on
fuel rail.
12.Remove 2 bolts securing protection cover - if
fitted and RH fuel rail to RH inlet manifold,
remove cover.13.Remove 2 bolts securing fuel rail to LH inlet
manifold.
14.Release injectors from manifolds and carefully
lay fuel rail and injectors aside.
CAUTION: Always fit plugs to open
connections to prevent contamination.
15.Using sequence shown, progressively loosen
and remove 8 cylinder head bolts.
16.Remove cylinder head.
CAUTION: Support both ends of cylinder
head on blocks of wood.
17.Remove and discard cylinder head gasket.
CAUTION: Do not rotate crankshaft with LH
cylinder head fitted.
Page 270 of 1007

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.
Page 271 of 1007

ENGINE - K SERIES KV6
12-3-94 OVERHAUL
16.Position injector protection cover - if fitted to RH
fuel rail and secure injector harness to
protection cover or fuel rail with clips.
17.Fit bolts securing fuel rail to inlet manifolds and
tighten to 9 Nm (7 lbf.ft).
18.Connect coolant bleed hose to inlet manifold
and secure with clip.
19. Up to 03MY:Position ignition coils to LH inlet
manifold.
20. Up to 03MY:Position earth lead, fit nuts and
bolts securing ignition coils to LH inlet manifold
and tighten to 9 Nm (7 lbf.ft).
21.Clean camshaft timing belt cover backplate
bolts and apply sealant, Part No. STC 50552 to
the first 3 threads.
22.Position backplate, fit and tighten bolts to 9 Nm
(7 lbf.ft).
23.Fit new camshaft timing belt.
+ ENGINE - K SERIES KV6,
OVERHAUL, Camshaft timing belt.
24.Clean exhaust manifold and mating face on
cylinder head.
25.Fit new exhaust manifold gasket. Position
exhaust manifold, fit nuts and using sequence
shown, tighten to 45 Nm (33 lbf.ft).
26.Connect RH HO2S multiplug, secure multiplug
in coolant rail bracket.
Cylinder head - decarbonise
$% 12.29.19
Remove
1.Remove cylinder head gaskets.
+ ENGINE - K SERIES KV6,
OVERHAUL, Cylinder head gasket - LH.
+ ENGINE - K SERIES KV6,
OVERHAUL, Cylinder head gasket - RH.
Disassembly
1. LH Cylinder head: Remove 3 bolts securing
LH rear timing belt cover and remove cover.
2. RH Cylinder head: Remove 2 bolts securing
RH rear timing belt cover heat shield to cylinder
head.
3. RH Cylinder head:Remove 3 bolts securing
RH rear timing belt cover; remove cover.
M12 6880
M12 6694
Page 272 of 1007
ENGINE - K SERIES KV6
OVERHAUL 12-3-95
4.Position LRT-12-175 to rear camshaft gears as
illustrated, remove and discard bolts securing
gears to camshafts.
5.Remove rear camshaft gears, timing belt and
LRT-12-175 as an assembly.
6.Remove LRT-12-175 from camshaft gears and
remove timing belt from gears. Discard timing
belt.
7.Remove spark plugs.
8.Remove and discard exhaust camshaft cap
seal from cylinder head.
Note: RH cylinder head illustrated.9.Progressively loosen then remove 7 bolts
securing inlet manifold to cylinder head,
remove inlet manifold and discard gasket.
10.Remove 4 bolts securing camshaft front timing
belt cover backplate to cylinder head and
remove backplate.
Note: LH backplate illustrated.
11.Remove 2 bolts securing camshaft rear timing
belt cover backplate to cylinder head and
remove backplate.
Note: LH backplate illustrated.
M12 6882
M12 6883
Page 273 of 1007

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.
Page 274 of 1007

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
Page 275 of 1007
ENGINE - K SERIES KV6
12-3-98 OVERHAUL
13.Check cylinder head face for warping, across
centre and from corner to corner.
+ GENERAL DATA, Engine - KV6
Petrol.
14.Check cylinder head height.
+ GENERAL DATA, Engine - KV6
Petrol.
Note: Provided that cylinder head height is kept
within limits, cylinder heads may be refaced.
15.Check condition of valve springs and measure
free length of springs.
+ GENERAL DATA, Engine - KV6
Petrol.16.Remove carbon deposits from exhaust valve
guides using a 6 mm diameter reamer inserted
from combustion side of cylinder head.
17.Remove carbon from inlet valve guides, inlet
and exhaust valves and valve seat inserts.
Remove all loose carbon on completion.
18.Check and record existing valve stem
diameters 'A', replace any valve with stem
diameter less than specified.
+ GENERAL DATA, Engine - KV6
Petrol.
19.Check inlet and exhaust valve to guide
clearances 'B' using the following procedures.
Page 276 of 1007

ENGINE - K SERIES KV6
OVERHAUL 12-3-99
20.Insert each valve into its respective guide.
21.Extend valve head 15 mm (0.6 in) out of guide
and position DTI gauge to rear of valve head.
22.Move valve towards front of cylinder head and
zero gauge ensuring that stylus of gauge
remains in contact with valve head.
23.Move valve towards rear of cylinder head,
record gauge reading obtained to give valve
stem to guide clearance 'B'.
+ GENERAL DATA, Engine - KV6
Petrol.
24.Remove valves ensuring they are retained in
their fitted order.
25.Renew valves and/or guides as necessary.
26.To replace valve guides support cylinder head
face down on wooden blocks.
27.Position LRT-12-519-3 in tappet bore and drift
out valve guide using LRT-12-519-1.
CAUTION: Retain guides in their fitted
order.28.Identify type of valve guide fitted: 'A' - Standard
production 'B' - Service replacement.
CAUTION: Standard production valve
guides A must be replaced with service
replacement guides B.
29.Locate valve guide in valve guide bore with
identification groove towards valve seat and
position depth gauge LRT-12-519-2 onto valve
guide.
CAUTION: Cylinder head and valve guides
must be at room temperature when fitting
guides.
30.Position nylon guide LRT-12-519-3 in cylinder
head, press guide into bore using driver LRT-
12-519-1 until depth gauge contacts cylinder
head.
M12 6890
LRT-12-519-1
LRT-12-519-3
M12 6892
LRT-12-519-2
LRT-12-519-1
LRT-12-519-3