Isuzu Trooper (1998-2002 year). Manual - part 380

 

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Isuzu Trooper (1998-2002 year). Manual - part 380

 

 

6A–50

ENGINE MECHANICAL (6VE1 3.5L)

Disassembly

NOTE:

D

During disassembly, be sure that the valve train
components are kept together and identified so that
they can be reinstalled in their original locations.

D

Before removing the cylinder head from the engine
and before disassembling the valve mechanism,
perform a compression test and note the results.

1. Remove camshaft drive gear pulley fixing bolt (3),

then pulley (4).

2. Remove camshaft bearing cap fixing bolt (5),

camshaft bearing cap (6), then camshaft exhaust (7),
and intake side (8).

3. Remove tappet with shim (11).
4. Use the 5-8840-2446-0 valve spring compressor and

5-8840-2547-0 valve spring compressor adapter to
remove the split collar (12), valve spring with upper
seat (13) and valve (14).

014RW042

5. Remove spark plug (1).

CAUTION: Do not remove the spark plugs when the
head and plugs are hot. Clean dirt and debris from
spark plug recess areas before removal.

Clean

Cylinder head

Carefully remove all varnish, soot and carbon from the
bare metal. Do not use surface conditioning disc on any
gasket sealing surface.

Inspection and Repair

1. Inspect cylinder head gasket and mating surfaces for

leaks, corrosion and blow–by. If the gasket has failed,
determine the cause.
– Insufficient torque on head bolts
– Improper installation
– Loose or warped cylinder head
– Missing dowel pins
– Warped case surface

2. Inspect cylinder head for cracks, especially between

valve seats and in the exhaust ports.

3. Inspect cylinder head deck for corrosion, sand

particles in head and porosity.

CAUTION:

D

Do not attempt to weld the cylinder head. Replace
it.

D

Do not reuse cylinder head bolts.

4. Inspect cylinder head deck, common chamber and

exhaust manifold mating surfaces for flatness. These
surfaces may be reconditioned by milling. If the
surfaces are “out of flat” with “round” by more than
specification, the surface should be ground to within
specifications. Replace the head if it requires
machining beyond the repairable limit.

Head surface and manifold surface
Standard: 0.05 mm (0.002 in) or less
Warpage limit: 0.2 mm (0.0079 in)
Maximum Repairable limit: 0.2 mm (0.0079 in)

Head height
Standard height : 133.2 mm (5.2441 in)
Warpage limit : 0.2 mm (0.0079 in)
Maximum Repairable limit : 133.0 mm (5.2362 in)

011RW019

5. Water jacket sealing plugs seating surfaces.

6A–51

ENGINE MECHANICAL (6VE1 3.5L)

Reassembly

1. Install Spark plug and tighten all the spark plugs to

specified torque.

Torque: 18 N·m (1.8 kg·m/13 lb ft)

2. Tighten sub gear setting bolt.

1. Use 5-8840-2443-0 gear spring lever to turn sub

gear to right direction until the M5 bolt aligns with
the hole between camshaft driven gear and sub
gear.

2. Tighten the M5 bolt to a suitable torque to prevent

the sub gear from moving.

014RW041

3. Install camshaft drive gear assembly and tighten

three bolts to the specified torque.

Torque: 10 N·m (1.0 kg·m/87 lb in)

4. Install camshaft assembly and camshaft bearing cap,

tighten twenty bolts on one side bank to the specified
torque.
1. Apply engine oil to camshaft journal and bearing

surface of camshaft bearing cap.

2. Align timing mark on intake camshaft (one dot for

right bank, two dots for left bank) and exhaust
camshaft (one dot for right bank, two dots for left
bank) to timing mark on camshaft drive gear (one
dot).

014RW020

Legend

(1) Intake Camshaft Timing Gear for Right Bank
(2) Intake Camshaft Timing Gear for Left Bank
(3) Exhaust Camshaft Timing Gear
(4) Discrimination Mark

LI: Left Bank Intake

RI: Right Bank Intake

LE: Left Bank Exhaust

RE: Right Bank Exhaust

014RW023

Legend

(1) Right Bank Camshaft Drive Gear
(2) Left Bank Camshaft Drive Gear
(3) Timing Mark on Drive Gear
(4) Dowel Pin

6A–52

ENGINE MECHANICAL (6VE1 3.5L)

014RW024

Legend

(1) Right Bank
(2) Left Bank

(3) Alignment Mark on Camshaft Drive Gear
(4) Alignment Mark on Camshaft
(5) Alignment Mark on Retainer

3. Tighten twenty bolts in numerical order on each

bank as shown in the illustration.

Torque: 10 N·m (1.0 kg·m/87 lb in)

014RW031

5. Tighten bolt for camshaft drive gear assembly pulley

to the specified torque.

Torque: 98 N·m (10.0 kg·m/72 lb ft)

6A–53

ENGINE MECHANICAL (6VE1 3.5L)

Valve Spring, Oil Controller, Valve, Valve Guide

Valve Spring, Oil Controller, Valve, Valve Guide and Associated Parts

014RW039

Legend

(1) Camshaft Bearing Cap Fixing Bolts
(2) Camshaft Assembly Inlet
(3) Camshaft Assembly Exhaust
(4) Shim
(5) Tappet
(6) Split Collar

(7) Spring Upper Seat
(8) Valve Spring
(9) Oil Controller

(10) Spring Lower Seat

(11) Valve Guide

(12) Valve

Disassembly

1. Remove camshaft bearing cap fixing bolts (1).
2. Remove camshaft assembly (intake).

3. Remove camshaft assembly (Exhaust side).
4. Remove shim (4) and tappet (5).

 

 

 

 

 

 

 

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