PREVOST H3-41 Maintenance Manual page 56

SECTION 01 : ENGINE
7. Remove the retaining bolts, washers and
nuts securing the power plant cradle to the
vehicle rear subframe.
8. Disconnect the engine coolant hose near
the starter.
9. Disconnect air compressor suction and
discharge hoses.
With Vehicle Lowered
•
Lower the vehicle enough to access all
components.
 Engine Compartment R.H. side
1. If applicable, remove auxiliary sump tank to
ease access.
2. Purge the A/C system and disconnect the
A/C compressor hoses. Refer to Section 22,
HEATING AND AIR CONDITIONING under
"CENTRAL AIR CONDITIONING".
3. Disconnect cables from chassis grounds.
4. Inside engine compartment, disconnect
starter, alternators and heater cables. Also
disconnect AFSS cable if applicable.
Disconnect from engine, connector C397 and
vehicle interface harness connector located
above EECU connectors. Also disconnect DPF
cable.
5. Disconnect power steering pump hoses.
6. Close engine fuel supply shut-off valve on
primary fuel filter or Fuel Pro. Disconnect
the fuel line located above fuel filters and
connected to inlet
equipped with the optional water-separator-
fuel-filter, disconnect the connector and
remove cable ties from cradle.
7. Disconnect fuel return line from bulkhead
fixed on engine cylinder head end.
8. Locate the A/C compressor belt tensioner
pressure releasing valve (if so equipped).
Turn pressure
counterclockwise
pressure in belt-tensioner air bellows and
loosen belts (Figure 13). Remove the belts.
20
PA1621 Maintenance Manual All Series | Section 01 revised Feb 2019
port. On vehicles
releasing valve handle
in order to release
FIGURE 13: BELT TENSIONER VALVE ON REAR
CONTROL PANEL (OPTION)
9. At the back of the air cleaner, disconnect the
engine-air intake duct mounted between air
cleaner housing and turbocharger inlet.
CAUTION
To avoid damage to turbocharger, cover the
turbocharger inlet opening to prevent foreign
material from entering.
10. Disconnect and remove the exhaust pipe
mounted between the flexible coupling and
the pipe going to the Diesel Oxidation
Catalyst (DOC) and Diesel Particulate Filter
(DPF) assembly. If necessary, refer to
Section 4: EXHAUST
"EXHAUST AFTERTREATMENT SYSTEM
OVERVIEW".
11. Disconnect and remove the air intake duct
mounted between the charge air cooler outlet
and the engine intake.
 Engine Compartment L.H. side
1. At the turbocharger inlet, disconnect
and remove the engine-air intake duct
mounted between air cleaner housing and
turbocharger inlet.
2. Disconnect and remove section of
coolant pipe assembly mounted between the
radiator outlet and the water pump inlet.
3. Disconnect and remove a section of
coolant pipe assembly mounted between the
thermostat housing and the radiator inlet.
4. Disconnect and remove surge tank
hose connected to pump inlet pipe and hose
connected to engine.
5. Disconnect and remove the air intake
duct mounted between the turbocharger
outlet and the air cooler inlet.
SYSTEM under