GMC T Series 1994 Repair Manual page 499

Important
• If a new camshaft or hydraulic lifters were
installed, add Engine Oil Supplement (GM P/N
1051396) or equivalent to the engine oil.
2. Fill the coolant system with the proper coolant (GM
6038-M).
3. With the ignition " OFF," or disconnected, crank the
engine several times. Listen for any unusual noises
or evidence that any parts are binding.
4. Start the engine and listen for unusual noses.
30. BOLT
32. ROCKER ARM COVER
Figure 99— Rocker Arm Cover Installation (7.4L Engines)
1. Exhaust Manifold
2. Washer
3. Lock
4. Bolt/Stud
6. Spark Plug Wire Heat Shield
5. Run the engine speed at about 1000 until the
engine is at operating temperature.
6. Listen for improperly adjusted valves or sticking lift­
ers, and other unusual noises.
7. Check for oil and coolant leaks while the engine is
running.
8. Using the proper Truck Service Manual or Emis­
sion Control Label for specifications, adjust the
ignition timing.
F9326
F9367