Isuzu Trooper (1998-2002 year). Service manual - part 382

6A–58

ENGINE MECHANICAL (6VE1 3.5L)

3. Install valve to valve guide. Before installing valve

guide apply engine oil to the outside of the valve stem.

4. Install valve spring to cylinder head. Attach the valve

spring to the lower spring seat. The painted area of
the valve spring should be facing downward.

014RS020

5. Install lower valve spring seat, valve spring and upper

valve spring seat then put split collars on the upper
spring seat, using the 5-8840-2446-0 valve spring
compressor and 5-8840-2547-0 valve spring
compressor adapter to install the split collars.

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6. Install tappet with shim.
7. Install camshaft assembly.

D

Refer to installation procedure for Camshaft in this
manual.

Valve Clearance Adjustments

NOTE: To adjust valve clearance, apply engine oil to the
cam as well as to the adjusting shim (2) with the cylinder
head built on the cylinder block, give a few turns to the
camshaft by means of timing pulley tightening bolt, and
measure valve clearance when the nose of cam is just
opposite of maximum cam lift (1) as shown in illustration
below.

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Legend

(1) Cam
(2) Shim
(3) Tappet

Valve Clearance Standard Value (cold)

Intake: 0.23 mm–0.33 mm

(0.0091 in–0.0130 in)

Exhaust: 0.25 mm–0.35 mm

(0.0098 in–0.0138 in)

Selection of Adjusting Shim

Shim to be selected = (Thickness of removed shim) +
(Valve clearance measurement – Standard value)
Based on the above formula, the best suited shim should
be selected from 41 types of shim (differently thick at
0.02mm (0.0008 in) intervals from 2.40mm (0.0945 in)
through 3.2mm (0.1260 in) thick). Install the shim and
check valve clearance.

6A–59

ENGINE MECHANICAL (6VE1 3.5L)

Replacement of Shim

Let the cam push down the edge of tappet by using
5-8840-2444-0 valve clearance adjusting tool and push
out the shim with a flat blade screw driver as shown in
illustrations below.

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6A–60

ENGINE MECHANICAL (6VE1 3.5L)

Camshaft

Camshaft and Associated Parts

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Legend

(1) Camshaft Bracket Fixing Bolt
(2) Camshaft Bracket
(3) Camshaft Assembly Intake
(4) Camshaft Assembly Exhaust
(5) Pulley Fixing Bolt

(6) Camshaft Drive Gear Pulley
(7) Retainer Fixing Bolt
(8) Retainer
(9) Camshaft Drive Gear

(10) Oil Seal

(11) O–ring

Disassembly

1. Remove fixing bolt (5) for camshaft drive gear pulley

using the 5-8840-2447-0 universal holder.

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6A–61

ENGINE MECHANICAL (6VE1 3.5L)

2. Remove twenty fixing bolts from intake and exhaust

camshaft bracket on one side bank, then camshaft
brackets (2).

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3. Remove camshaft assembly (3), (4) with camshaft

end plug.

4. Remove three fixing bolts (7) from camshaft drive

gear retainer (8), then camshaft drive gear assembly.

5. Use the snap ring pliers to remove the snap ring(1).
6. Remove the wave washer(2), sub gear(3) and spring

camshaft gear(4) from the camshaft assembly(5).

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Legend

(1) Snap Ring
(2) Wave Washer
(3) Sub Gear
(4) Spring; Camshaft Gear
(5) Camshaft Assembly

Inspection and Repair

1. Use a micrometer to measure the cam lobe height

and uneven wear. Replace the camshaft if either the
lobe height or the uneven wear exceeds the specified
limit.

Lobe height : 44.709 mm (1.7602 in)
Uneven wear : 0.05 mm (0.0020 in)

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2. Use a micrometer to measure the diameter and the

uneven wear of the camshaft journals.
Replace the camshaft if the diameter or the uneven
wear exceeds the specified limit.

Journal Diameter
Standard : 25.972 mm–25.993 mm

(1.0225 in–1.0233 in)

Limit : 25.8 mm (1.0157 in)
Uneven wear : 0.05 mm (0.0020 in)

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