PAN AS-OIL 2Y3990 - Caterpillar

Remove Cylinder Head Assembly
Start By:a. remove rocker shaft assemblies and push rodsb. remove water temperature regulator (industrial engine)c. remove aftercooler housingd. remove fuel injection linese. remove exhaust manifold 1. Remove bolts (1) from the alternator bracket (if equipped).2. Remove the bolts that hold plate (3), and remove the plate.3. Disconnect water line (2) from the air compressor (if equipped). Turn the water line tee toward the lifting bracket in order to provide clearance to remove the head bolt. 4. Remove bolts (4) and (5) that hold the cylinder head assembly to the cylinder block.5. Fasten a hoist, and remove the cylinder head assembly. The weight is approximately 135 kg (300 lb).
Do not put the cylinder head assembly down on a flat surface. This can cause damage to the fuel injection valves.
6. Remove the gasket and seals from the spacer plate.Install Cylinder Head Assembly
Be sure a new gasket has been installed between the spacer plate and the cylinder block. See Remove & Install Spacer Plate. 1. Thoroughly clean the spacer plate and the bottom surface of the cylinder head assembly. Install a new head gasket, new seals (1) and two O-ring seals (2). 2. Fasten a hoist, and put cylinder head assembly (3) in position on the cylinder block.
(1) Large bolts (3/4in). Put 6V-4876 Molycoat Paste Lubricant on bolt threads and between washer and underside of bolt heads.(2) Small bolts (3/8in). See Step h.3. Put clean engine oil on the threads of the cylinder head bolts. Install the cylinder head bolts and washers. Tighten the bolts in sequence shown in illustration D11970.a. Tighten bolts 1 through 14 in number sequence to a torque of 270 25 N m (200 20 lb ft).b. Tighten bolts 1 through 14 in number sequence to a torque of 470 20 N m (345 15 lb ft)c. Tighten bolts 1 through 14 in number sequence to a torque of 470 20 N m (345 15 lb ft)by hand.d. Install the rocker shaft assemblies and push rods. See the topic "Install Rocker Shaft Assemblies & Push Rods".e. Tighten bolts 15 through 26 in number sequence to a torque of 270 25 N m (200 18 lb ft).f. Tighten bolts 15 through 26 in number sequence to a torque of 450 20 N m (330 15 lb ft).g. Tighten bolts 15 through 26 in number sequence to a torque of 450 20 N m (330 15 lb ft).by hand.h. Tighten the 3/8" bolts to a torque of 45 7 N m (33 5 lb ft). If the studs for the exhaust manifold were removed, install new studs, and tighten them to a torque of 25 4 N m (18 3 lb ft).4. Make an adjustment to the valves to have a clearance of 0.38 mm (.015 in)for intake and 0.76 mm (.030 in)for exhaust. Tighten the locknuts for the valve adjustment screws to a torque of 28 4 N