CHECKING VVT OIL PRESSURE
This test can be used to help diagnose VVT faults.
Disconnect and remove oil pressure sensor (1).
CAUTION:
Threads in block are 1/8”-28 British Standard Pipe (BSP). Do not install a National Pipe Thread (NPT) threaded adapter, this could crack the cylinder block.
Install an 1/8-28 BSP male to 1/8-27 female threaded adapter (2).
Install oil pressure gauge (1).
Start engine and record oil pressure.
CAUTION:
If oil pressure is 0 at idle, do not perform the 3000 RPM test
If oil pressure is 0 at idle, shut off engine. Check for pressure relief valve stuck open or a clogged oil pick-up screen.
Remove oil pan and inspect for debris (Refer to 09 - Engine/Lubrication/PAN, Oil - Removal) .
Remove oil pressure relief valve (Refer to 09 - Engine/Lubrication/VALVE, Oil Pressure Relief - Removal) and inspect, if damaged replace pressure relief valve.
If pressure relief valve is ok, replace balance shaft module assembly (Refer to 09 - Engine/Lubrication/PUMP, Engine Oil - Removal) .
After test is complete, remove test gauge (1) and fitting (2).
Install oil pressure sensor and electrical connector.
Remove oil pan (Refer to 09 - Engine/Lubrication/PAN, Oil - Removal)
Remove pressure regulating valve cap (2).
Remove pressure regulating valve spring (3) and valve (4).
When removing and installing the Balance Shaft/Oil Pump assembly in the vehicle, it is not necessary to align the plated links on the drive chain as long as the reference marks are created during the procedure.
Remove the oil pan (Refer to 09 - Engine/Lubrication/PAN, Oil/Removal)
Rotate the engine clockwise until the balance shaft/oil pump drive gear and the housing indicator are aligned.
NOTE: IT IS VERY IMPORTANT THAT THE CRANKSHAFT STAYS STATIONARY DURING THE FOLLOWING STEPS. DO NOT MOVE THE CRANKSHAFT UNTIL THE INSTALLATION PROCEDURE IS COMPLETED.
Clean the balance shaft/oil pump assembly drive gear with Mopar® brake cleaner or similar.
NOTE: Make sure the gear is clear of any oil to allow for marking.
If the balance shaft/oil pump assembly is being reused, mark the oil pump chain and the sprocket (1) to the module body (2) for reassembly.
Install one air-conditioning compressor bracket bolt into the left forward corner thread boss.
NOTE:
The bolt will provide a sturdy point to secure a tie strap to hold the tensioner in the compressed position.
Position a plastic tie strap (3) around the chain, tensioner (4) and bolt (2) that was previously installed.
Push the chain, guide and tensioner (1) to the compressed position.
Tighten the tie strap to hold the components together.
NOTE:
The tighter the strap, the more room for removal and installation.
Remove the balance shaft/oil pump assembly mounting bolts.
Remove assembly from the engine by tilting the rear of the balance shaft/oil pump assembly downward while lifting the drive gear out of the chain links.
INSTALLATION
CAUTION:
There are two different Balance Shaft Module (BSM) to engine block bolts used. 180 mm bolts with a lock-patch on the threads or 185 mm bolts without lock-patch. Do not reuse the 180 mm bolts. Always discard 180 mm bolts after removing. Failure to replace these bolts can result in engine damage. The 185 mm bolts are reusable. Install the same length bolts that were removed and use either four new 180 mm bolts or four 185 mm bolts.
The 185 mm (7.283 in.) length bolts must be checked for stretching. Check the bolts with a straight edge for necking (2). If the bolts are necked down, they must be replaced.
Clean the balance shaft/oil pump assembly mounting holes with Mopar® brake parts cleaner.
Align the marks on the balance shaft/oil pump assembly and drive sprocket.
With the rear of the balance shaft/oil pump assembly on a slight downward angle, position the gear into the chain links. Make sure the paint marks are aligned.
Pivot balance shaft/oil pump assembly assembly upwards and position on ladder frame.
Start balance shaft/oil pump assembly mounting bolts by hand.
NOTE:
Use a three step procedure when tightening balance shaft/oil pump assembly mounting bolts. For new 180 mm bolts, go to step 7. For 185 mm bolts, go to step 8.
Tighten new 180 mm balance shaft/oil pump assembly mounting bolts as follows:
Tighten to 15 N·m (11 ft. lbs.) in the sequence shown.
Tighten to 33 N·m (24 ft. lbs.) in the sequence shown.
Rotate bolts an additional 90° in the sequence shown.
Tighten 185 mm balance shaft/oil pump assembly mounting bolts as follows:
Tighten to 15 N·m (11 ft. lbs.) in the sequence shown.
Tighten to 29 N·m (22 ft. lbs.) in the sequence shown.
Rotate bolts an additional 90° in the sequence shown.
Double check the alignment marks to ensure the gear (1) and balance shaft/oil pump assembly indicator (2) is aligned.
Remove the tie strap (3).
Remove the bracket bolt (2).
Inspect that the tensioner (1) has fully extended and applied pressure to the guide and chain (4).
Install the oil pan (Refer to 09 - Engine/Lubrication/PAN, Oil/Installation) .
Fill engine with oil.
Start engine and check for leaks.