How To Check The Clearance Between Camshaft And Camshaft Journal

The camshaft is a critical component in the engine, responsible for opening and closing the valves at the correct time. The camshaft needs to be timed and aligned correctly to ensure that the engine runs smoothly and efficiently. One crucial aspect of the camshaft is the clearance between the camshaft and the camshaft journal. This clearance is essential as it affects the performance of the engine. In this article, we will discuss how to check the clearance between the camshaft and camshaft journal.

Step 1: Preparation
Before checking the clearance, you need to prepare the necessary tools and equipment. You will need a micrometer, a set of feeler gauges, and a torque wrench.

Step 2: Remove the rocker arm assembly
Remove the rocker arm assembly and any other components that may hinder access to the camshaft journal.

Step 3: Position the camshaft
Rotate the engine crankshaft to the correct position, which is when the camshaft lobe of the cylinder you are working on is in the up position.

Step 4: Measure the camshaft journal
Use a micrometer to measure the diameter of the camshaft journal. The camshaft journal needs to be measured at several points to get an average reading.

Step 5: Measure the camshaft lobe
Measure the base circle of the camshaft lobe using a micrometer.

Step 6: Calculate the clearance
To calculate the clearance, subtract the camshaft lobe diameter from the camshaft journal diameter. The clearance should be within the manufacturer's recommended specifications. If the clearance is out of specification, you need to replace the camshaft or the camshaft journal.

Step 7: Check the oil clearance
To check the oil clearance, use a set of feeler gauges to measure the gap between the camshaft journal and the corresponding bearing cap. The clearance should be within the manufacturer's recommended specifications. If the clearance is out of specification, you need to replace the bearing cap or adjust the clearance.

Step 8: Reassemble the rocker arm assembly
After checking the clearance and oil clearance, reassemble the rocker arm assembly and any other components that were removed.

Step 9: Torque the bolts
Use a torque wrench to tighten the rocker arm assembly bolts to the manufacturer's recommended specification.

In conclusion, checking the clearance between the camshaft and the camshaft journal is essential for the performance of the engine. By following the steps outlined above, you can check the clearance and oil clearance and ensure that the engine runs smoothly and efficiently. Remember to always follow the manufacturer's recommended specifications and replace any components that are out of specification.