Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSISUZU2004ASCENDER 2WD L6-4.2LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINESERVICE AND REPAIROVERHAULCAMSHAFTS CLEANING AND INSPECTION
2004 Isuzu Ascender 2WD L6-4.2L
Camshafts Cleaning and Inspection
2004 Isuzu Ascender 2WD L6-4.2LSECTION Camshafts Cleaning and Inspection
Camshafts Cleaning and inspection
Tools Required
^ J 7872 Magnetic Base Dial indicator Set
1. Clean the camshafts with cleaning solvent.
2. Inspect the camshafts for the following conditions:
^ Scored camshaft journals
^ Damaged camshaft lobes
^ Damaged camshaft sprocket locator pin slots
^ Damaged threads
3. Measure the camshaft lobes using a micrometer. The intake camshaft lobes should be a minimum of 41.5 mm (1.635 inch). The exhaust camshaft lobes should be a minimum of 41 mm (1.615 inch).
4. Use J 7872 to measure the camshaft runout.
4.1. Set the camshaft in V-blocks between the centers.
4.2. Measure the intermediate camshaft journal.
5. Use J 7872 to measure the camshaft lobe lift.
5.1. Lubricate the camshaft to V-block contact areas with engine oil.
5.2. Set the camshaft on V-blocks.
5.3. Measure the camshaft lobe lift.
6. If the runout or camshaft lobe lift is not within specifications, replace the camshaft.
Tools Required
^ J 7872 Magnetic Base Dial indicator Set
1. Clean the camshafts with cleaning solvent.
2. Inspect the camshafts for the following conditions:
^ Scored camshaft journals
^ Damaged camshaft lobes
^ Damaged camshaft sprocket locator pin slots
^ Damaged threads
3. Measure the camshaft lobes using a micrometer. The intake camshaft lobes should be a minimum of 41.5 mm (1.635 inch). The exhaust camshaft lobes should be a minimum of 41 mm (1.615 inch).
4. Use J 7872 to measure the camshaft runout.
4.1. Set the camshaft in V-blocks between the centers.
4.2. Measure the intermediate camshaft journal.
5. Use J 7872 to measure the camshaft lobe lift.
5.1. Lubricate the camshaft to V-block contact areas with engine oil.
5.2. Set the camshaft on V-blocks.
5.3. Measure the camshaft lobe lift.
6. If the runout or camshaft lobe lift is not within specifications, replace the camshaft.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.