General Information
Some engines are built with a camshaft bushing installed in the first camshaft bore only, on the same end of the
engine that the camshaft is removed and installed (front gear train engines, at the front of the engine and rear gear
trains, at the rear of the engine). Some engines also have a second camshaft bushing at the opposite end of the
engine from which the camshaft is removed and installed.
From production, there are no camshaft bushings installed in the inner block camshaft journal bores. If the
inner block camshaft journal bores are damaged, the journal bores can be machined for camshaft bushings.
Initial Check
Inspect the camshaft bushing at the end of the engine in which the camshaft was removed for scoring, scuffing, or
excessive wear.
If damage to the camshaft bushing is found, remove and replace the camshaft bushing.
From below the engine, determine if a camshaft bushing is installed at the opposite end of the engine from which
the camshaft was removed.
If a camshaft bushing is present, inspect the camshaft bushing for scoring, scuffing, or excessive wear.
If damage to the camshaft bushing is found, remove and replace the camshaft bushing.
To replace the camshaft bushing, you must first:
For Rear Gear Train Engines:
Remove the front gear cover. Refer to Procedure 001-031 in Section 1.
For Front Gear Train Engines:
Remove the flywheel housing. Refer to Procedure 016-006 in Section 16.
Remove
Use the camshaft bushing replacer kit, Part Number 3165045, to remove the camshaft bushings. The tool will
drive the camshaft bushing to the inside of the block. The camshaft bushing can be retrieved from the bottom of the
engine.
NOTE: Once removed, camshaft bushings can not be reused.
Inspect for Reuse
Measure the camshaft bores without the camshaft bushing installed.
If a camshaft bushing was previously installed and the camshaft bore is out of specification, the block must be
replaced. Refer to Procedure 001-026 in Section 1. No oversize cam bushings are available.
If a camshaft bore in which a camshaft bushing was not previously installed is damaged or out of specification, the
camshaft bore can be machined oversize to install a standard camshaft bushing.
Machine the damaged bore to a maximum of 59.248 mm (2.3326 in) to accept a standard bushing.
Install
Mark the camshaft bushing and cylinder block so for aid in alignment of the lubricating oil hole in the cylinder block
with the large lubricating oil hole in the bushing.
Slide the camshaft bushing on the replacer tool. Align the marks on the camshaft bushing and the cylinder block.
Drive the camshaft bushing to the correct installed depth.
The correct installed depth is when the camshaft bushing end is flush with the machined face of the block and the
oil hole aligns with the cylinder block oil hole.
Be sure the large lubricating oil hole is aligned.
A 3.2 mm [0.128 in] diameter rod must be able to pass through the lubricating oil hole.
Measure
Measure the installed camshaft bushing.
