Camshaft and Camshaft Gears - Remove and Install


Camshaft - Remove and Install

Removal Procedure

Remove the rockershaft and pushrods. Remove the front housing. The engine should be mounted on a suitable stand and placed in the inverted position.


Remove the thrust washer (1) from the cylinder block. Do not remove the dowel (2) from the cylinder block unless the dowel is damaged. The thrust washer can have one or two slots (X).


Do not damage the lobes or the bearings when the camshaft is removed or installed. Carefully remove the camshaft (3) from the cylinder block. If necessary, remove the key (4) from the camshaft (3).

Installation Procedure

Clean the camshaft and the thrust washer. Inspect the camshaft and the thrust washer for wear and for damage. Replace any worn components or any damaged components. Clean the camshaft bearing in the cylinder block. Inspect the camshaft bearing for wear and for damage. If necessary, replace the camshaft bearing. Inspect the lifters for wear and for damage. Replace any worn lifters or any damaged lifters. If necessary, install a new key (4) into the camshaft (3). Lubricate the bearing surfaces of the camshaft (3) and lubricate the lobes of the camshaft with clean engine oil.
Carefully install the camshaft (3) into the cylinder block.


Lubricate the thrust washer with clean engine oil. Align the slot (X) in the thrust washer (1) with the dowel (2) in the cylinder block. Install the thrust washer (1) into the recess in the cylinder block. The thrust washer can have one or two slots (X). Install the front housing. Install the rockershaft and pushrods.


Camshaft Gear

Removal Procedure

Remove the valve mechanism cover. Remove the front cover.
Use Tooling in order to rotate the crankshaft so that number one piston is at top dead center on the compression stroke.


Install Tooling through the hole (X) in the camshaft gear (1) into the front housing. Use Tooling in order to lock the camshaft in the correct position.


Remove the plug (4) from the cylinder block. Install Tooling into the hole (Y) in the cylinder block. Use Tooling in order to lock the crankshaft in the correct position.


Loosen the nuts (6) on all rocker arms (7). Unscrew the adjusters (5) on all rocker arms (7) until all valves are fully closed. Failure to ensure that all adjusters are fully unscrewed can result in contact between the valves
and pistons.

Alignment of timing marks

Mark the gears (1) and (8) in order to show alignment.


Remove Tooling. Remove the setscrew (3) and the washer (2) from camshaft gear (1). Remove the camshaft gear (1) from the camshaft. If the camshaft gear is a tight fit on the nose of the camshaft, use a prybar in order to remove the camshaft gear. If necessary, remove the key (not shown) from the nose of the camshaft.

Installation Procedure

Ensure that number one piston is at top dead center on the compression stroke.


Ensure that Tooling is installed in hole (Y) in the cylinder block. Use Tooling in order to lock the crankshaft in the correct position. Ensure that the camshaft gear and the key are clean and free from wear or damage. If necessary, install the key into the nose of the camshaft. Ensure that the key is squarely seated.


Align the keyway in the camshaft gear (1) with the key in the camshaft. Install camshaft gear onto the camshaft. Ensure that the timing marks on gears (1) and (8) are in alignment and that the mesh of the gears is correct. Refer to Illustration.


Install Tooling through the hole (X) in the camshaft gear into the front housing. Install the washer (2) and the setscrew (3) to the camshaft gear (1).
Remove Tooling. Install the plug (4) into hole (Y) in the cylinder block. Refer to Illustration. Tighten the setscrew (3) to a torque of 95 N·m (70 lb ft).

Checking backlash

Ensure that the backlash for the gears (1) and (8) is within specified values.
Ensure that the end play for the camshaft gear (1) is within specified values.
Lubricate the teeth of the gears with clean engine oil. Adjust the valve lash.
Install the front cover. Install the valve mechanism cover.

Lifter Group

Removal Procedure

Remove the engine oil pump. Remove the camshaft. If the crankshaft is installed, use Tooling to rotate the crankshaft in order to gain access to the appropriate lifters (1).


Use Tooling in order to remove the lifters (1). Place a temporary identification mark on each lifter in order to identify the correct location. Repeat Steps to remove the remaining lifters.

Installation Procedure

Clean the lifters. Follow Steps to inspect the lifters. Replace any worn lifters or damaged lifters. Inspect the seat of the pushrod in the lifter for visual wear or damage. Inspect the shank of the lifter for wear or damage. Inspect the face of the lifter that runs on the camshaft for visual wear or damage.
If the crankshaft is installed, use Tooling to rotate the crankshaft to access to the cylinder block in order to install the appropriate lifters (1). Lubricate the lifters (1) with clean engine oil. Use Tooling to install the lifters (1) to the cylinder block. Ensure that used lifters are installed in the correct location. The lifters should be free to rotate. Repeat Steps to install the remaining lifters. Install the camshaft. Install the engine oil pump.


Camshaft Bearings

Removal Procedure

Remove the engine oil pump. Remove the camshaft.


Inspect the camshaft bearing (1). If the camshaft bearing (1) is worn or damaged use Tooling in order to remove the camshaft bearing from the cylinder block. Remove the camshaft bearing from the front of the cylinder block.

Installation Procedure

Clean the bearing housing in the cylinder block. Ensure that the oil hole in the bearing housing is free from debris.


Lubricate the bearing housing in the cylinder block with clean engine oil.
Accurately align the large oil hole (X) in camshaft bearing (1) with the oil hole in the cylinder block. The groove (Y) in the camshaft bearing must be to the top of the cylinder block. Use Tooling in order to install the camshaft bearing (1) into the cylinder block. Install the camshaft bearing so that the front edge of the bearing is flush with the face of the recess in the cylinder block. Ensure that the oil holes are correctly aligned. If the oil is not correctly aligned, the camshaft bearing should be removed. Install the camshaft.