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CYLINDER HEAD COVER

REMOVE

(1)Remove air cleaner assembly.

(2)Disconnect battery and relocate spark plug wires.

(3)Remove vacuum connections.

(4)Remove rocker cover screws and remove cover (Fig. 2).

INSTALL

(1)Clean cylinder head and cover mating surfaces. Install new gasket.

(2)See (Fig. 2) and apply sealant such as Mopar Silicone Rubber Adhesive Sealant to cover ends.

(3)Install cover and tighten cover bolt washer and gasket assembly to 10 Nzm (88 in. lbs.).

AUTO LASH ADJUSTER

The automatic lash adjusters are precision units installed in machined openings in the valve actuating ends of the rocker arms. Do not disassemble the auto lash adjuster.

Fig. 2 Rocker Cover

FUNCTION CHECK

Check auto adjusters for free play by inserting a small wire through the air bleed hole in the rocker arm and VERY LIGHTLY pushing the auto adjuster ball check down (Fig. 3). While lightly holding the check ball down move the rocker up and down to check for free play. If there is no play replace the adjuster.

Fig. 3 Auto Lash Adjuster Check

Fig. 4 Auto Lash Adjuster Retainers

CAMSHAFT SERVICE

SEE AUTO LASH ADJUSTER FUNCTION CHECK BEFORE DISASSEMBLY

REMOVAL

(1)Install auto lash adjuster retainers. (Fig. 4).

(2)Remove distributor extension (Fig. 1).

(3)When removing camshaft bearing caps do not remove the bolts from the bearing caps. Remove the rocker arm, rocker shafts and bearing cap as an assembly.

CAMSHAFT INSPECTION

(1) Inspect camshaft bearing journals for damage and binding (Fig. 5). If journals are binding, also check the cylinder head for damage (Fig. 1). Also check cylinder head oil holes for clogging.

Fig. 5 Check Camshafts

(2)Front cylinder head camshaft check the tooth surface of the distributor drive gear teeth of the camshaft and replace if abnormal wear is evident (Fig. 5).

(3)Check the cam surface for abnormal wear and damage and replace if defective. Also measure the cam height (Fig. 5) and replace if out of limit, standard value is 41.25 mm (1.624 inch), wear limit is 40.75 mm (1.604 inch).

CAMSHAFT INSTALL

Lubricate camshaft journals and cams with engine oil and istall camshaft on cylinder head.

Fig. 6 Inspect Rocker Arms

ROCKER ARMS

(1) Check rocker arms for wear or damage (Fig. 6). Replace as necessary. Also see Auto Lash Adjuster.

ROCKER ARM SHAFTS

The rocker arm shaft is hollow and is used as a lubrication oil duct. The rocker arm shaft on the inlet

Fig. 7 Rocker Arm Shaft Identification

side has a 3mm diameter oil passage hole from the cylinder head. The exhaust side does not have this oil passage (Fig. 7).

(1)Check the rocker arm mounting portion of the shafts for wear or damage. Replace if heavily damaged or worn.

(2)Check oil holes for clogging with small wire, clean as required (Fig. 7).

REASSEMBLE

Fig. 8 Camshaft Bearing Caps Position

(1)Align the camshaft bearing caps with arrows (depending on cylinder bank) directed as shown in (Fig. 8) and in numerical order.

Identify number one bearing cap number one and number four caps are similar (Fig. 9).

(2)Install rocker shafts so that bearing cap number one with end notches positioned as shown in Figure 9 that the machined portion of the rocker shaft is facing down.

(3)Insert attaching bolts to retain assembly.

Fig. 9 Number One Camshaft Bearing Cap

ASSEMBLE ROCKER ASSEMBLY

Install the rocker arms, bearing caps and springs.

Springs are the same and can be used at all locations on the rocker arm shafts (Figs. 8 and 10). Insert bolts in number four bearing cap to retain assembly.

INSTALL ROCKER ARM SHAFT ASSEMBLY

(1)Apply Mopar Silicone Rubber Adhesive Sealant at bearing cap ends as shown in (Fig. 8).

(2)Install the rocker arm shaft assembly making sure that the arrow mark on the bearing cap and the arrow mark on the cylinder head are in the same direction. (Fig. 8).

The direction of arrow marks on the front and rear assemblies are opposite to each other.

(3)Tighten bearing cap bolts in the following order to 10 Nzm (85 in. lbs.). First #3, then #2, #1 and #4.

(4)Repeat step 3 increasing the torque to 20 Nzm (180 in. lbs.).

(5)Install distributor drive adaptor assembly (Fig.

11).

CAMSHAFT OIL SEAL SERVICEÐENGINE OUT OF VEHICLE

(1)Apply light coat of engine oil to the camshaft oil seal lip.

(2)Install the oil seal using camshaft oil seal installer tool MD998713 (Fig. 12).

CAMSHAFT END SEAL (PLUG) SERVICEÐIN VEHICLE SERVICE

(1)Remove air cleaner assembly from engine.

(2)Use a small punch and a hammer, carefully remove cam plug from cylinder head.

(3)Clean the area of the cylinder head where the new cam plug will be installed.

(4)Apply a light coating of Mopar Silicone Rubber Adhesive Sealant to the outer diameter of the NEW cam plug.

(5)Using a suitable installing tool and a hammer,

Fig. 11 Distributor Drive

install the new cam plug to a depth of 0.5mm (0.020 inch) below the surface of the cylinder head.

(6) Replace air cleaner assembly.

CAMSHAFT END SEAL (PLUG) SERVICEÐOUT OF VEHICLE SERVICE

Install end seal plug with Special Tool MD998306. (Fig. 13).

Fig. 12 Install Camshaft Oil Seal

CYLINDER HEAD

REMOVAL

(1) See Timing System this group for disassembly and remove camshaft sprockets.

Fig. 13 Install Camshaft End SealÐPlug

(2)See Camshaft Rocker Arms Removal.

(3)Remove upper intake manifold assembly. Refer to Intake and Exhaust Manifolds, Group 11.

(4)Remove distributor.

(5)Remove exhaust manifolds and cross over Refer to Intake and Exhaust Manifolds, Group 11.

Fig. 14 Cylinder Head Bolt Removal Sequence

(6) Remove cylinder head bolts in sequence shown in (Fig. 14) and remove cylinder head.

Fig. 15 Check Cylinder Head

INSPECTION

(1)Before cleaning, check for leaks, damage and cracks.

(2)Clean cylinder head and oil passages.

(3)Check cylinder head for flatness (Fig. 15).

(4)Cylinder head must be flat within;

²Standard dimension = less than 0.05mm (.002 inch)

²Service Limit = 0.2mm (.008 inch)

²Grinding Limit = Maximum of 0.2 mm (.008 inch) is permitted.

CAUTION: This is a combined total dimension of stock removal from cylinder head if any and block top surface.

Fig. 16 Cylinder Head Bolt Tightening Sequence

INSTALLATION

(1) Clean surfaces of head and block, install head gasket over locating dowels.

Fig. 17 Remove Valves

Fig. 18 Remove Valve Stem Seals

(1)With suitable valve spring compressor, remove spring retainer locks, retainer, valve spring, spring seat and valve (Fig. 17).

(2)Remove valve stem seals with suitable tool (Fig. 18). Do not reuse valve stem seals.

VALVES

(1)Check valve stem tip for pitting or depression at point A (Fig. 19).

(2)Check for wear and ridge wear at Point B.

Fig. 20 Valve Specification

VALVE SEAT INSPECTION

Inspect the valve seat with Prussian blue to determine where the valve contacts the seat. To do this, coat valve seat LIGHTLY with Prussian blue then set valve in place. Rotate the valve with light pressure. If the blue is transferred to the center of valve face, contact is satisfactory. If the blue is transferred to top edge of the valve face, lower valve seat with a

Fig. 21 Valve Spring

Fig. 22 Valve Seat Reconditioning

15 degrees stone. If the blue is transferred to the bottom edge of valve face raise valve seat with a 65 degree stone.

(1)Install valve spring seat.

(2)Using suitable tool install seal by tapping lightly until seal is in place. (Fig. 23).

(3)Install valve spring with the enamelled ends facing the rocker arms (Fig. 24).

CAUTION: During reassembly, compressing the valve spring more than necessary to install valve

Fig. 23 Install Valve Stem Seals

Fig. 24 Installed Valve Spring Position

spring retainer locks can cause the retainer to be forced against the stem seal and damaging it.