77
The 2
nd
stage intake valve can be removed for maintenance purposes while those of the 1
st
, 2
nd
(only
discharge) and 3
rd
stages must be entirely replaced. The seats must be cleaned carefully using petrol
and soft brass or nylon brushes.
The torque wrench setting for the head bolts of the 3
rd
stage is initially 1 Kgm. Having moved the head
closer, tighten the bolts to 2.2 Kgm, making sure that the piston is at the bottom dead centre during the
operation.
Avoid using steel brushes or screwdrivers. The interval between maintenance operations is 400-600
working hours. If any parts are damaged or worn, they must be replaced. The discharge valves can be
removed from the outside while the intake valves can only be removed when the head of the cylinder has
been taken off.
NOTE: the valve replacement procedure must be carried out at the work bench by specialized technicians
who have specific equipment for the stripping operation.
In any case, it is preferable to contact AEROTECNICA COLTRI S.r.l. who will supply the necessary
technical assistance.
11.8
Intake and discharge valves
11.9
Heads
130
- The head of the 1
st
stage (A) is of the lamellar
type (Fig. 130). It must be fitted so that the
word “TOP” remains upwards and the flaps
correspond with the openings in the cover of
the head. Replace every 1000 hours.
Maintenance
Summary of Contents for MCH 13/DH
Page 93: ...93 13 2 Electricals diagrams Machine diagrams...
Page 94: ...94 Machine diagrams...
Page 106: ...106 153 152 156 155 154 158 097 157 159 160 198 188 187 189 Spare parts Filtering system...
Page 110: ...110 MCH 13 16 ETC Spare parts 006 007 008 009 005 012 013 010 011 002 001 003 004...
Page 112: ...112 MCH 13 16 ET Spare parts 006 007 008 009 005 012 013 010 011 002 001 003 004 015 014 016...
Page 114: ...114 MCH 8 EM Spare parts 006 007 008 009 017 012 013 010 011 002 001 003 004 015 014 016...
Page 116: ...116 MCH 13 16 SH Spare parts 006 007 008 009 018 012 013 019 020 002 001 003 004...
Page 118: ...118 MCH 13 16 DY Spare parts 015 014 003 004 002 001 022 023 009 016 007 008 021 006 012 013...
