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(3)Apply light coating of engine oil to the entire circumference of oil seal lip.

(4)Install seal assembly on cylinder block and tighten bolts to 12 Nzm (104 in. lbs.)

FRONT CRANKSHAFT OIL PUMP AND OIL SEAL

(1) Install oil pump gasket and oil pump case (Figs. 1 and 14).

CAUTION: Install bolts, depending on length in locations shown in (Fig. 14).

(2) Using front crankshaft oil seal installer Special Tool MB998306 install oil seal in oil pump (Fig. 15).

CYLINDER BLOCK

Inspect cylinder block for scratches, cracks and rust or corrosion, and repair or replace as required.

Fig. 13 Apply Sealant to Oil Seal Housing

Fig. 14 Oil Pump

Fig. 15 Crankshaft Front Oil Seal

(2)Clean cylinder block and check top surface for distortion with a straight edge and thickness gauge (Fig. 16).

(3)Top surface must be flat within:

Fig. 16 Distortion Check

BORING CYLINDER

Examine cylinder wall for scuffs, scoring and measure cylinder bore for out-of-round or taper. If defective, bore cylinder to oversize. Measure at points shown in (Fig. 17).

Four oversize pistons are available 0.25mm (.010 inch) 0.50mm (.020 inch) 0.75mm (.030 inch) and 1.0mm (.039 inch). Determine oversize piston on basis of largest cylinder bore.

Fig. 17 Measure Cylinder Bore

(1)Bore to specified clearance between the piston O.D. and cylinder. The measuring point of the piston O.D. is shown in (Fig. 18).

(2)Based on measured piston O.D., calculate boring finish dimension. Boring finish dimension equals piston O.D. plus 0.03 to 0.05 mm (.0012 to .002 inch)

The lubrication system is a full flow filtration pressure feed type. Oil, stored in the oil pan, is taken in and discharged by a internal gear type oil pump directly coupled to the crankshaft and its pressure is regulated by a relief valve. The oil is fed through an oil filter and to the crankshaft journals from the oil

gallery in the cylinder block. This gallery also feeds oil under pressure to the cylinder heads. It then flows from a camshaft bearing cap on each cylinder head through passages in the rocker shafts to the rocker arm pivots, auto lash adjusters, and camshaft journals. (Fig. 1).

Fig. 2 Oil Pan

OIL PAN

The oil pan is made of sheet metal and is provided with a baffle-plate to prevent fluctuations in the oil level while the vehicle is running (Fig. 2).

Fig. 3 Oil Pan Sealing

OIL PAN SEALING AND INSTALLATION

Oil pan to crankcase sealing is provided with Mopar Silicone Rubber Adhesive Sealant or equivalent gasket material. See Form-In-Place Gaskets in Standard Service Procedures.

(1)Apply sealant as shown in (Fig. 3).

(2)Install pan and tighten screws to 6 Nzm (50 in. lbs.) in sequence shown in (Fig. 4).

Fig. 4 Oil Pan Screw Tightening Sequence

Fig. 5 Oil Pump-Installed

REMOVAL

Remove accessory drive system. Refer to Accessory Drive Service in this group.

Remove 5 bolts that attach oil pump to block (Fig. 6).

Fig. 6 Oil Pump Assembly

INSPECTION OIL PUMP

(1)Check oil pump case for damage and remove rear cover.

(2)Remove pump rotors and inspect case for excessive wear.

(3)Measure clearance between case and inner rotor (Fig. 8).

(4)Insert the rotor into the oil pump case (Figs. 9 and 10) and measure clearance with a feeler gauge as indicated.

Fig. 7 Oil Pump Components

Fig. 8 Inner Rotor to Case

(5) Replace if out of limits.

Fig. 9 Checking Clearance-Between Outer Rotor and

Case

OIL RELIEF PLUNGER

(1) Check that the oil relief plunger slides smoothly.

Fig. 10 Checking Rotor End Clearance

(2) Check for broken relief spring.

INSTALLATION

(1)Clean block and pump surfaces.

(2)Install new gasket (Fig. 7) make sure correct length bolts are used (Fig. 6).

(3)Torque bolts to 13 Nzm (120 in. lbs.).

CHECKING ENGINE OIL PRESSURE

Check oil pressure using gauge at oil pressure switch location. Oil pressure should be 41 kPa (6 psi.) at idle or 241 to 517 kPa (35 to 75 psi.) at 3000 RPM.

(1) Remove pressure sending unit and install oil pressure gauge. (Fig. 11)

CAUTION: If oil pressure is 0 at idle, Do Not Run engine at 3000 RPM.

(2) Warm engine at high idle until thermostat opens.

Fig. 11 Checking Oil Pump Pressure

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Fig. 12 Oil Filter and Bracket

OIL FILTER AND BRACKET

BRACKET

INSPECTION

(1)Check the oil filter mounting surface. The surface must be smooth, flat and free of debris or old pieces of rubber (Fig. 12).

(2)Check bracket for cracks and oil leaks.

OIL FILTER

(1)Turn counter clockwise to remove.

(2)To install, lubricate new filter gasket. Screw filter on until gasket contacts base. Tighten 1 turn.

3.0L ENGINE 9 - 95