REMOVAL & INSTALLATION
See Figures 1, 2, 3 and 4
The 3.3L engine uses a conventional camshaft arrangement with a nodular iron camshaft mounted in four steel-backed babbitt bearings in the engine block. A thrust plate located in front of the first bearing and bolted to block, controls end-play. A regular timing chain drives the camshaft. The chain is enclosed by a cast aluminum cover which also carries a front crankshaft seal, oil pump, provides front oil pan closure and water pump mounting.
To remove and replace the camshaft on this engine and in this vehicle, the engine assembly must be removed from the vehicle.
- Disconnect the battery negative cable.
- Raise and safely support the vehicle. Drain the engine oil and remove the oil filter.
- Relieve the fuel system pressure using the recommended procedure.
- Remove the radiator and cooling fan assemblies.
- Remove the engine from the vehicle using the recommended procedure.
- With the engine removed from the vehicle, remove the cylinder head covers, rocker arm and rocker arm shaft assemblies.
- Remove the intake manifold assembly and cylinder heads from the engine.
- Remove the harmonic balancer. Remove the timing chain case cover and timing chain from the engine.
- Remove the pushrods and tappets. If any valvetrain components are to be reused, identify each part and its location so each can be installed in its original location.
If the camshaft is being removed to replace with a new one, new valve lifters MUST be installed. Installing used lifters on a new camshaft will quickly fail the camshaft.
- Remove the camshaft thrust plate. Install a long bolt into the front of the camshaft to act as a handle and aid in removal. Remove the camshaft being careful not to damage the cam bearings with the cam lobes.
- Inspect the bearing journals and the lobes on the shaft for damage and replace the camshaft is required. New lifters must be installed on a new camshaft.
- Lubricate the camshaft lobes and the camshaft bearing journals. Inspect the bearing journals on the camshaft and install the shaft within 2 inches of its final position in the cylinder block.
Chrysler recommends the addition of 1 pint of Chrysler Crankcase Conditioner or equivalent, be added to the crankcase when the camshaft has been replaced. This will aid in break-in. Leave the oil mixture in the engine for a minimum of 500 miles (804 km) and drain at the next normal oil change.
- Install the camshaft thrust plate with the 2 screws and tighten to 105 inch lbs. (12 Nm).
- Rotate the crankshaft so the timing arrow is in the 12 o'clock position.
- Position the camshaft sprocket so the timing arrow is at the 6 o'clock position. Place the timing chain around the camshaft sprocket aligning the dark colored link of the chain with the dot on the camshaft sprocket.
- Place the timing chain around the crankshaft sprocket aligning the dot on the crankshaft sprocket with the dark colored link on the chain. Install the camshaft sprocket in position on the shaft.
- Using a straightedge, check the alignment of the timing arrows. Install the camshaft bolt and washer and tighten to 40 ft. lbs. (54 Nm).
Rotate the crankshaft 2 revolutions in the direction of engine rotation. Check the alignment of the timing arrows, which should line up with each other.
- If they do not align, remove the camshaft sprocket and re-time the engine.
- Again, rotate the crankshaft 2 revolutions in the direction of rotation, and confirm alignment of the timing marks.
- Check the camshaft end-play. With new thrust plate the specification is 0.005-0.012 inch (0.0127-0.3040 mm) or 0.012 inch (0.3040 mm) for old thrust plate. If not within specifications, replace thrust plate.
- Lubricate and install the valve lifters (tappets) in their original position. If the camshaft was replaced, all lifters must be replaced with new parts.
- Install the timing chain front cover using new seals and O-rings.
- Install the cylinder heads and intake manifold assemblies onto the engine using the recommended procedures.
- Lubricate and install the pushrods in their original position.
- Install the rocker arm and rocker arm shaft assemblies. Install the cylinder head covers.
- Tighten the oil pan drain plug and install a new oil filter.
- Install the engine into the vehicle using the recommended procedure.
- Install the radiator and cooling fan assemblies.
- Be sure that all fluid lines, cables, hoses, and electrical connectors are attached and secured.
- Refill the engine with the correct amount of clean SAE 5W-30 OR SAE 10W-30 engine oil only. Do not mix the 2 grades of oil.
- Refill and bleed the cooling system.
- Reconnect the negative battery cable. Start the engine and inspect for leaks. Test drive the vehicle.
- Check engine fluid levels and top off if necessary.
See Figure 5
This is an Overhead Camshaft design engine. Two belt-driven overhead camshafts provide valve actuation. The left camshaft is provided with a DIS pick-up wheel and is longer. Both camshafts are supported by four bearing journals. Thrust for the camshafts is taken at the thrust plate attached to the rear of the cylinder head. Right and left camshaft driving sprockets are NOT interchangeable. The sprockets and the engine water pump are driven by a single notched timing belt.
Camshafts are serviced from the rear of the cylinder head. Although the engine does not need to be removed for camshaft service, the cylinder head must be removed from the vehicle. Note too, that the camshaft sprockets have a D-shaped hole that allows it to rotate several degrees in each direction on its shaft. When cam sprockets are loosened or removed, the camshafts must be timed to the engine to ensure proper performance of the engine.
- Disconnect the negative battery cable.
- Release the fuel system pressure. Drain the cooling system.
- Remove the radiator/cooling fan assemblies and the accessory drive belts.
- Remove the crankshaft damper and the timing belt covers.
- Mark the timing belt rotation direction for installation. Align the timing belt sprockets with marks on the rear timing belt covers before removing the timing belt.
- Remove the timing belt tensioner and timing belt.
- Remove the timing belt sprockets at each camshaft.
- Remove the intake manifold assembly using the recommended procedure.
- Separate the exhaust manifold from the cylinder head assembly. Be sure to clean the gasket mating surfaces between the exhaust manifold and the cylinder head.
- The rear timing belt cover must be removed to remove the cylinder heads. Remove the rear timing belt cover-to-cylinder head bolts. Remove the rear timing belt covers. The right-hand side timing belt cover has O-rings located behind it for the water pump passages.
- Remove the cylinder head bolts and remove the cylinder head from the engine.
- Mark the rocker arm assembly to note component locations prior to disassembly. Remove the rocker arm and shaft assemblies from the cylinder head.
- Remove the rear camshaft cover and O-ring from the head.
- Carefully remove the camshaft from the rear of the head taking care not to nick or scratch the journals when removing.
- Inspect camshaft journals for wear or damage. If wear is present, inspect the cylinder head for damage. Inspect the head oil holes for clogging. Replace the camshaft as required.
- Measure the height of the cam using a micrometer. Measure in two places; the unworn area and in the wear zone. Subtract the figures to get cam wear. The standard specification is 0.001 inch (0.0254 mm) with the wear limit being 0.010 inch (0.254 mm). Replace the camshaft if it is worn beyond this specification
- Lubricate the camshaft journals and cam with clean engine oil. Install camshaft into cylinder head.
- Install the camshaft cover and O-ring to the head and tighten to 21 ft. lbs. (28 Nm).
- Install the rocker arm assemblies in their original location.
- Install the cylinder head assembly to the engine block. New head bolts are recommended.
- Install the rear timing belt covers and tighten the rear cover-to-cylinder head bolts.
- Install the timing belt sprocket, timing belt and timing belt tensioner using the recommended procedure. Be sure that once they are all installed, the timing of the camshaft(s) is accurate. See the Timing Belt procedure in this section.
- Install the exhaust manifold, with a new manifold gasket, to the cylinder head.
- Install the intake manifold assembly using the recommended procedure.
- Install the timing belt covers and crankshaft damper. Install the accessory drive belts and set them to the proper tension.
- Install the radiator and cooling fan assembly.
- Refill and bleed the cooling system. An oil and filter change is recommended.
- Reconnect the negative battery cable.
This procedure is a general procedure and can be used for the camshafts in both engines covered by this guide.
- Inspect the camshaft bearing journals for damage and binding. If the journals are binding, also check the cylinder head for damage. Check the cylinder head oil holes for clogging.
- Check the camshaft surface for abnormal wear and damage. Replace the camshaft with a new one if defective. Measure the camshaft lobe height and replace if the different lobes vary by more than 0.020 inch (0.5mm).