Tools Required

J 7872  Dial Indicator Set

Fig 1: View Of Camshaft, Camshaft Gear & Camshaft Thrust Plate
Courtesy of GENERAL MOTORS CORP.
1. Install the camshaft thrust plate to the camshaft.
2. Install the camshaft driven gear.
3. Install a new camshaft driven gear bolt.

   Leave the bolt finger tight.

Fig 2: View Of Camshaft Gear Aligned With Crankshaft Gear
Courtesy of GENERAL MOTORS CORP.
4. Install the camshaft and gear assembly into the cylinder block, aligning the camshaft gear to the crankshaft gear as shown.
NOTE: Refer to Fastener Notice .
5. Install the camshaft thrust plate bolts.

   Tighten:  Tighten the camshaft thrust plate bolts to 22 N.m (16 lb ft).

Fig 3: Using Tool To Relieve The Spring Tension While Removing The Locking Bolt
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Use a suitable tool to relieve the spring tension while removing the locking bolt.
6. Remove the exciter ring bolt that was installed to hold the spring tension of the two piece cam gear.
Fig 4: View Of Camshaft Exciter Ring, Bolts & Thrust Plate Bolts
Courtesy of GENERAL MOTORS CORP.
7. Install the camshaft position sensor exciter ring to the camshaft gear.
8. Install the camshaft position sensor exciter ring bolts.

   Tighten:  Tighten the camshaft position sensor exciter ring bolts to 9 N.m (80 lb in).

Fig 5: Blocking Crankshaft From Turning Using Wooden Handle
Courtesy of GENERAL MOTORS CORP.
9. Block the crankshaft from turning using a wooden handle.
10. Install the new camshaft gear bolt.

    Tighten:  Tighten the new camshaft gear bolt to 234 N.m (173 lb ft).

Fig 6: Measuring Camshaft End Play Using J 7872
Courtesy of GENERAL MOTORS CORP.
11. Measure the camshaft end play with J 7872  .
    • The production value is 0.050-0.114 mm (0.0020-0.0045 in) and service limit is 0.2 mm (0.0079 in).
    • Replace the camshaft gear or the camshaft thrust plate if measured value exceeds the service limit.