Jeep Engines - Oljeep

T -7-754 MOPAR PERFORMANCE PARTS1Cleaning and InspectionFigure 2 - 51CYLINDER HEADCYLINDERJ8909-lo9Stuff clean lint free shop towels into the cylinder boreswhile the head is removed.Thoroughly clean the cylinder head and cylinder blockmating surfaces. Clean the intake and exhaust manifold andcylinder head mating surfaces. Remove all gasket materialand carbon.Check to ensure that no coolant or foreign material hasfallen into the tappet bore area.Remove carbon deposits from the combustion chambers.InstallationThe cylinder head gasket is a composition gasket. Thegasket is to be installed DRY. DO NOT use a gasket sealingcompound on the gasket.If the cylinder head is to be replaced and the original valvesused, measure the valve stem diameter. Only standard sizevalves can be used with a service replacement cylinder headunless the replacement head valve stem guide bores arereamed to accommodate oversize valve stems. Remove allcarbon buildup and reface the valves.1. Fabricate two engine cylinder head alignment dowelsfrom used head bolts (Figure 2-52). Use the longesthead bolt. Cut the head of the bolt off below the hexhead. Then cut a slot in the top of the dowel to alloweasier removal with a screwdriver.2. Install one dowel in bolt hole No. 10 and the otherdowel in bolt hole No. 8 (Figure 2-53).3. Remove the shop towels from the cylinder bores. Coatthe bores with clean engine oil.4.Place the engine cylinder head gasket (with thenumbers facing up) over the dowels.5. Place the engine cylinder head over the dowels.Caution: Engine cylinder head bolts should be reused onlyonce. Replace the head bolts if they were used before or ifthe:y have a paint dab on the top of the bolt.6. Coat the threads of bolt No. 7, only, with Loctite PSTsealant (or equivalent).7. Install all head bolts, except No. 8 and No. 10.8. Remove the dowels.9. Install No. 8 and No. 10 head bolts.Caution: During the final tightening sequence, bolt No. 7will be tightened to a lower torque than the rest of the bolts.DO NOT over tighten bolt No. 7.10. Tighten the engine cylinder head bolts in sequenceaccording to the following procedure (Figure 2-54):a. Tighten all bolts in sequence (1 through 10) to 30Nom (22 ft-lbs) torque.b. Tighten all bolts in sequence (1 through 10) to 61Nom (45 ft-lbs) torque.c. Check all bolts to verify they are set to 61 Nom(45 ft-lbs) torque.d. Tighten bolts (in sequence):Bolts 1 through 6 to 149 Nom (110 ft-lbs) torque.Bolt 7 to 136 Nom (100 ft-lbs) torque.Bolts 8 through 10 to 149 Nom (110 ft-lbs)torque.e. Check all bolts in sequence to verify thecorrect torque.f. If not already done, clean and mark each bolt witha dab of paint after tightening. Should youencounter bolts which were painted in an earlierservice operation, replace them.11. Connect the coolant temperature sending unitconnector.12. Install the spark plugs and tighten to 37 Nom (27 ft-lbs)torque. Connect the ignition wires.13. Install the intake and exhaust manifolds (refer to ‘FuelDelivery and Fuel Injection Systems’ and ‘ExhaustSystem’ sections of this chapter for properprocedures).