- Warm up the engine to normal operating temperature, then shut the engine off.
- Check the condition of the engine oil. Change the oil and filter, if necessary.
- Connect an oil pressure gauge, as shown in Fig. 2. Start the engine and check the oil pressure. It should be 21-36 psi at 1000 rpm.
- Stop the engine and remove the rocker arm cover. Refer to .
- Push down on the hydraulic lash adjuster side of the rocker arm to make sure the hydraulic lash adjuster cannot be compressed. Use a shop rag as the rocker arm will be hot.
- If the hydraulic lash adjuster can be compressed, it must be replaced.
This clearance check is usually only needed when the valves, valve seats and/or cylinder head gasket surface have been machined or new parts have been installed. Clearance must be checked when the lifter is completely collapsed.
- Disconnect the negative battery cable.
- Remove the rocker arm covers. Refer to .
- Rotate the engine until the No. 1 cylinder is at TDC of its compression stroke and check the clearance between the rocker arm and the following valves: No. 1 intake and exhaust, No. 2 exhaust, No. 3 intake, No. 4 exhaust and No. 6 intake.
- To check the clearance, use lifter bleed down wrench T71P-6513-B or equivalent, to push down on the rocker arm and bleed the oil from the lifter.
- Insert the appropriate thickness feeler gauge between the rocker arm and valve stem to check the clearance.
- Rotate the crankshaft 360 degrees and check the clearance between the rocker arm and the following valves: No. 2 intake, No. 3 exhaust, No. 4 intake, No. 5 intake and exhaust and No. 6 exhaust.
- The clearance should be 0.09-0.19 in. (2.3-4.8mm).
- If the clearance is less than specified, shorter pushrods are available to correct the problem. If the clearance is greater than specified, longer pushrods are available.