Cylinder Head - Volvo 850 Accessories Manual

pipe-to-manifold nuts to end of threads. Do not tighten to more than
84 INCH lbs. (10 N.m).

CYLINDER HEAD

Removal
1) Disconnect negative battery cable. Remove expansion tank
cap. Remove splash guard under engine. Open drain cocks on cylinder
block and radiator and drain coolant. Remove exhaust manifold-to-front
exhaust pipe nuts. Remove exhaust manifold. See EXHAUST MANIFOLD under
REMOVAL & INSTALLATION. Remove timing belt. See TIMING BELT under
REMOVAL & INSTALLATION.
2) Lift and place fuel distribution manifold and injectors
aside. Install Holders (5465) to injectors. Disconnect 2 braided
ground leads from engine. Remove 4 fan shroud retaining screws. Remove
control module box cooling air ducts. Bend shroud aside slightly, lift
relay holder, and disconnect electric cooling fan connectors. Remove
control module box and air cleaner intakes. Lift out electric cooling
fan assembly.
NOTE: Avoid damage to injector nozzles and needles.
3) Disconnect Idle Air Control (IAC) valve and Throttle
Position (TP) potentiometer connectors. Disconnect crankcase
ventilation and EVAP canister hoses. Disconnect servo (vacuum)
reservoir and intake manifold vacuum servo hoses. Remove intake hose.
4) Remove 3 intake manifold upper mounting bolts. Remove oil
dip-stick and bracket from intake manifold. Loosen manifold lower
mounting bolts a few turns. Remove manifold bracket bolt. Remove
intake manifold.
5) Disconnect upper radiator hose from thermostat housing.
Mark camshaft pulleys for reassembly reference and remove camshaft
pulleys. Remove timing belt cover inner bolt. Remove air cleaner
housing and hoses. Remove Camshaft Position (CMP) sensor and shutter.
Remove distributor cover, rotor and ignition lead clip. Remove torque
arm and brackets. Starting at outer edge and working inward, remove
bolts in upper half of cylinder head. Remove upper cylinder head by
very carefully tapping upward with a copper mallet at parting lugs and
camshaft pulley end. Mark camshafts for reassembly reference and
remove camshafts.
6) Remove 2 coolant pipe bolts. Starting at outer edge and
working inward, remove cylinder head bolts. Remove cylinder head. See
Fig. 3. Remove cylinder head gasket.