Tools Required

J 7872  Dial Indicator Set

Fig 1: Measuring Camshaft End Play Using J 7872
Courtesy of GENERAL MOTORS CORP.
1. Measure the camshaft end play using J 7872  .
   • The production value is 0.050-0.114 mm (0.002-0.0045 in) and service limit is 0.20 mm (0.008 in).
   • Replace the camshaft or the camshaft thrust plate if the measured value exceeds the service limit.
Fig 2: Blocking Crankshaft From Turning Using Wooden Handle
Courtesy of GENERAL MOTORS CORP.
2. Block the crankshaft from turning with a wooden handle.
3. Loosen the camshaft gear bolt and leave the bolt finger tight.
Fig 3: View Of Camshaft Exciter Ring, Bolts & Thrust Plate Bolts
Courtesy of GENERAL MOTORS CORP.
4. Remove the camshaft exciter ring bolts.
IMPORTANT: The two piece cam gear must be bolted together to prevent the spring tension from unloading upon removal.
5. Remove the camshaft exciter ring.
Fig 4: Using Exciter Ring Bolt To Secure Spring Tension
Courtesy of GENERAL MOTORS CORP.
6. Align the threaded hole with a suitable tool and install an exciter ring bolt to secure the spring tension.
7. Remove the camshaft thrust plate bolts through the holes in the camshaft gear.
Fig 5: View Of Camshaft With Camshaft Gear Attached
Courtesy of GENERAL MOTORS CORP.
8. Remove the camshaft with the camshaft gear attached.
Fig 6: View Of Camshaft, Camshaft Gear & Camshaft Thrust Plate
Courtesy of GENERAL MOTORS CORP.
9. Remove the camshaft gear bolt and washer.
10. Remove the camshaft gear.
11. Remove the camshaft thrust plate.