Camshaft Bearings; Camshaft End Play; Rocker Arm Shaft Assembly - Isuzu Trooper II 1986 Manual

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Table Of Contents

Table of Contents

Removal

1) On 1.9L models, remove valve cover. Remove mechanical

fuel pump (if equipped). Rotate camshaft until No. 4 cylinder is on

TDC of compression stroke. Remove distributor cap and mark rotor

position on housing. Lock timing chain tensioner by depressing and

turning slide pin 90 degrees clockwise. See Fig. 1.

2) Check chain for slack after locking tensioner. Remove

fuel pump drive cam (if equipped) and camshaft sprocket with timing

chain attached. DO NOT separate chain and sprocket.

3) On 2.0L turbo and 2.3L models, remove valve cover and

cylinder head as previously outlined. Rotate crankshaft until No. 4

piston is at TDC of compression stroke. Remove timing belt cover and

timing belt. Remove camshaft timing sprocket and guide plate.

4) On all models, remove rocker arm shaft and bracket

assembly. Remove camshaft.

Inspection

1) Inspect camshaft lobes and journals for wear or damage.

Measure height of camshaft lobes. Replace camshaft if measurement is

less than 1.432" (36.37 mm).

2) Measure camshaft journals. If journal diameter is less

than 1.331" (33.83 mm) or if difference between largest and smallest

journal is more than .002" (.05 mm), replace camshaft.

3) Place camshaft on "V" blocks and check runout at center

journal. If runout exceeds .004" (.10 mm), replace camshaft. A slight

amount of runout can be corrected with a press. DO NOT apply heat.

Installation

1) Apply heavy coat of engine oil to camshaft journals and

bearing surfaces. Install camshaft and rocker arm shaft brackets so

that mark on camshaft thrust flange is aligned with mark on No. 1

rocker arm shaft bracket. Ensure that crankshaft sprocket mark is

aligned with TDC mark on front cover.

2) Reverse removal procedure to complete installation.

Ensure that rotor and mark on distributor housing are aligned when

No. 4 cylinder is in firing position. Check that crankshaft sprocket

mark is aligned with TDC mark on front cover.