RAM 3500 Truck 4WD V10-8.0L VIN W (1997)
Hydraulic Tappet: Testing and Inspection
Pre-Checks
CHECKING OIL PRESSURE
Before disassembling any part of the engine to correct tappet noise, check the oil pressure. If vehicle has no oil pressure gauge, install a reliable
gauge at the pressure sending unit. The pressure should be between 207 - 552 kPa (30 - 80 psi) at 3,000 RPM.
CHECKING OIL LEVEL
Check the oil level after the engine reaches normal operating temperature. Allow 5 minutes to stabilize oil level, check dipstick. The oil level in
the pan should never be above the FULL mark or below the ADD OIL mark on dipstick. Either of these two conditions could be responsible for
noisy tappets.
High Oil Level
If oil level is above the FULL mark, it is possible for the connecting rods to dip into the oil. With the engine running, this condition could create
foam in the oil pan. Foam in oil pan would be fed to the hydraulic tappets by the oil pump causing them to lose length and allow valves to seat
noisily.
Low Oil Level
Low oil level may allow oil pump to take in air. When air is fed to the tappets, they lose length, which allows valves to seat noisily. Any leaks on
intake side of oil pump through which air can be drawn will create the same tappet action. Check the lubrication system from the intake strainer to
the pump cover, including the relief valve retainer cap. When tappet noise is due to aeration, it may be intermittent or constant, and usually more
than one tappet will be noisy. When oil level and leaks have been corrected, operate the engine at fast idle. Run engine for a sufficient time to
allow all of the air inside the tappets to be bled out.
