56
EnGInE
Engine Suspension
In operation, check tightening of threaded joints of the front and rear
engine suspensions (see Appendix 2) and condition of the struts. no
delamination or breakage of the engine struts is allowed.
Engine Cylinder Head
Cylinder head bolts tightening is not required during operation.
Perform the tightening only when the engine is cold, if necessary. In
order to provide a tight and even contact of the cylinder head bolt with
the gasket, perform the tightening in a sequence shown in Fig. 9.1, in
two steps. Tighten the bolts evenly using the torque wrench (refer to
Appendix 2).
In case of increased oil consumption due to burn-out loss, pinking
and surface ignition, remove the cylinder head and clean surface of the
combustion chambers, valve discs and piston tops off soot deposition.
Fig. 9.1. Sequence of the cylinder head fastening
bolts tightening
Engine Gas-Distribution mechanism
The camshafts have a chain double-stage drive. The chains are pulled
by hydraulic tensioners.
ATTENTION!
Do not take the hydraulic tensioner out of the chain
cover to prevent disengagement of the piston with the casing caused by
the wrap spring. Otherwise assembly in a special fixture will be required.
The valves are driven from the camshafts directly via the hydraulic
pushers. Where the hydraulic pushers are being used, no clearance
adjustment is required.
Engine lubrication System
If there exist faults in the lubrication system, the engine operation
must be stopped immediately.
ATTENTION!
The Manufacturer installs onto the ZMZ-40911 engine
a smaller oil filter which must be replaced during the first maintenance
