Isuzu Trooper (1998-2002 year). Service manual - part 247

6A–62

ENGINE MECHANICAL

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.

014RW082

014RW083

014RW084

6A–63

ENGINE MECHANICAL

Camshaft

Camshaft and Associated Parts

014RW040

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

Disassembly

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

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

6A–64

ENGINE MECHANICAL

014RW060

2. Remove twenty fixing bolts from inlet and exhaust

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

014RW027

3. Remove camshaft assembly (3), (4).
4. Remove three fixing bolts (7) from camshaft drive

gear retainer (8), then camshaft drive gear 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)

014RW043

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)

014RS023

3. Place the camshaft on V–blocks.

Slowly rotate the camshaft and measure the runout
with a dial indicator.
Replace the camshaft if the runout exceeds the
specified limit.

6A–65

ENGINE MECHANICAL

Runout
Limit : 0.1 mm (0.0039 in)

014RW044

4. Measure the camshaft journal oil clearance.

1. Measure the camshaft bracket housing inside

diameter.

NOTE: Tighten camshaft bracket (2) to specified torque
before measuring the camshaft bracket inside diameter.

Torque : 10 N·m (1.0 Kg·m/89 lb in)

014RW031

2. Subtract the camshaft outside diameter from the

camshaft bracket housing inside diameter.

Oil Clearance
Standard : 0.027 mm–0.078 mm

(0.0011 in–0.0031 in)

Limit : 0.11 mm (0.0043 in)

014RW037

5. Replace the cylinder head and/or camshaft if the

measured oil clearance exceeds the specified limit.
1. Carefully clean the camshaft journal, the

camshaft bracket, and the cylinder head.

2. Install camshaft assembly and camshaft brackets

(2), tighten twenty bolts (1) on one side bank to
the specified torque.

Torque: 10 N·m (1.0 Kg·m/89 lb in)

014RW031

3. Measure the camshaft thrust clearance with a dial

indicator. Replace the camshaft and/or the
cylinder head if the camshaft thrust clearance
exceeds the specified limit.

Camshaft thrust Clearance
Standard : 0.03 mm–0.08 mm

(0.0012 in.–0.0031 in.)