Camshaft, Lifters, Timing Components Inspection

SPROCKET INSPECTION





1. Inspect the gears for warping, abnormal wear, or missing teeth.
1) Replace as necessary.

CAMSHAFT INSPECTION
Camshaft Inspection





1. Inspect camshaft lobes for pitting or damage in the active area. Minor pitting is acceptable outside the active area.





2. Measure diameter (A) and diameter (B) with a vernier caliper. The difference in measurements is the lobe lift.





3. Measure each side of the lobe for even wear.





4. Use the Dial Indicator With bracketry to measure the camshaft runout.
1) Rotate the camshaft and subtract the lowest dial indicator reading from the highest dial indicator reading.

NOTE: Camshaft journals must be within specifications before checking runout.

Oil Clearance Inspection





1. Measure each camshaft journal diameter in two directions. Verify journal diameter is within specifications. Refer to Specifications.
1) If out of specification, replace as necessary.





2. Measure the camshaft bearings in two directions.
1) Subtract the camshaft journal diameter from the camshaft bearing diameter.

NOTE: The camshaft journals must meet specification before checking camshaft journal clearance.

Camshaft End Play Inspection
1. Remove the valve tappets; refer to Engine Disassembly/Assembly.
2. Use a suitable Dial Indicator With bracketry to measure the camshaft end play.
3. Position the camshaft to the rear of the cylinder block.
4. Zero the Dial Indicator With bracketry.





5. Move the camshaft to the front of the cylinder block. Note and record the camshaft end play.
1) Refer to the specification chart. Refer to Specifications.
2) If the camshaft end play exceeds specification, replace the camshaft thrust plate; refer to Engine Disassembly/Assembly.


TAPPET INSPECTION
Tappet Inspection





1. Inspect the valve tappet for damage. If any damage is found, inspect the camshaft lobes and valves for damage.
2. Replace parts as necessary.

Tappet Leakdown Test
1. Compress the hydraulic valve tappet to remove the engine oil, if necessary.

NOTE: The Hydraulic Valve Tappet Leakdown Test will not be accurate if it is done with engine oil in the hydraulic valve tappet. Use testing fluid. New hydraulic valve tappets are already filled with testing fluid.





2. Place the (A) hydraulic valve tappet in a (B) commercially available Hydraulic Tappet Leakdown Tester. Position the (C) steel ball provided in the plunger cap. Add testing fluid to cover the hydraulic tappet and compress Hydraulic Tappet Leakdown Tester until the hydraulic valve tappet is filled with testing fluid.





3. Adjust the length of the (A) ram so that the (B) pointer is just below the (C) Start Timing mark when the ram contacts the hydraulic valve tappet. Start timing as the pointer passes the (C) Start Timing mark and end timing as the pointer reaches the (D) center mark.