GASKET 8N3248 - Caterpillar

Caterpillar Products: Machine Engines
All 3500 SeriesService Magazine SEPD1730, 31 January 2014, "Procedure for Installing the Camshaft Drive Gear". Disregard this previous article, the article below has been updated to correct the installation procedure.A new installation procedure for the camshaft gear includes a process for cleaning the taper of the camshaft and the bore of the camshaft gear. There is also a revised procedure for tightening the bolt for the camshaft gear.Installation Procedure for the Camshaft Drive Gear
Clean the taper of the camshaft and the tapered bore of the camshaft gear with a lint free cloth. Saturate the cloth with a solvent in order to remove any excess oil. Clean the parts again with a lint free alcohol wipe in order to remove any residue. If the alcohol wipe is dirty after cleaning the parts, clean the parts again with a lint free alcohol wipe. Repeat this process until no residue is left on the alcohol wipe.Note: The taper of the camshaft and the tapered bore of the camshaft gear have to be clean, dry, and free of residue before assembly.
Repeat step 1 for the remaining camshaft and camshaft gear.
Ensure that both camshafts have the pins in place.
Ensure that the flywheel has the pin in place.
Install the camshaft gears onto the camshafts and remove any backlash by rotating the gears in the opposite direction of camshaft rotation.For "Standard Rotation" engines, turn the camshaft gears counterclockwise.For "Reverse Rotation" engines, turn the camshaft gears clockwise.
Install the timing ring, the accessory drive gear, or the plate according to the assembly.Note: Ensure that the hole in the timing ring is properly seated on the locating pin.Torque Procedure
Tighten the retaining bolts for the camshaft gears.Torque ... 360 N m (265 lb ft)
Mark a vertical line on the head of the bolt for the camshaft gear. Refer to Illustration 1.
Illustration 1 g01226674
Vertical line
Place a driver against the retaining plate of the camshaft gear. Strike the driver solidly with a hammer 3 to 4 times.
Tighten the retaining bolts for the camshaft gears again.Torque ... 360 N m (265 lb ft)
Repeat steps 3 and 4 until the mark on the bolt turns a minimum of 90 degrees. Refer to Illustration 2.
Illustration 2 g01226685