Ingersoll-Rand 3IRH2N, Руководство по ремонту

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2.2.7 Inspection every 200 0 hours or 2 years
Be sure to check the following points every 2,000 hours or two years operation, whichever comes first.
No. Inspection Item
(1) Cleaning of cooling water system, inspection of parts and maintenance
(2) Inspection and replacement of fuel pipe and cooling water pipe
(3) Lapping the intake and exhaust valves
(4) Fuel injection timing inspection and adjustment
(1) Cleaning of cooling water system, inspection of parts and maintenance
Rust and water scale will accumulate in the cooling system through many hours of operation. This lowers the
engine cooling effect. Oil coolers (attached to turbocharged engines and some of naturally aspirated engines)
guickly deteriorate the engine oil. The cleaning and maintenance of the following parts are necessary in
accordance with the cooling water replacement.
Cooling system parts: radiator, cooling water pump, thermostat, cylinder block, cylinder head, oil cooler.
(2) Inspection and replacement of fuel pipe and cooling water pipe
Regularly check the rubber hoses of the fuel system and cooling water system for prevention of fuel or water
leak. If cracked or degraded, replace them with new one. Replace the rubber hoses at least every 2 years.
(3) Lapping the intake and exhaust valves
The adjustment is necessary to maintain proper contact of the valves and seats.
(4) Fuel injection timing inspection and adjustment
The fuel injection timing is adjusted so that engine performance may become the best condition.
As for the engine which adopts a MP type fuel injection pump, the fuel injection angle (Note1) is adjusted for the
fuel injection timing adjustment, because the adjusting method of fuel injection timing like an inline fuel pump
can’t be applied.
Note1) A fuel injection angle
L
θ
(cam angle) is defined as the
difference in position of a flange angle fixation from
the position of FIR when dynamic injection timing FIR
is measured with an actual fuel pump, and it is the
value, which depends on pump specifications.
Fuel injection angle
2 / ) FIR ) 5 . 2 ( FIT (
L
− = θ
FIT(2.5) is the crank angle when the plunger lift of the
fuel pump is 2.5mm, and is the specified crank angle
to install a fuel pump.
And, as for the actual fuel injection angle
L
θ
, the
measured value is recorded in the pump by each
every fuel pump.
The adjustment of fuel injection angle
L
θ
In case that a gear case cover and a fuel pump are
removed, and reassembled, the procedure of fuel
injection angle adjustment is as follows.
[NOTICE]
1) Never loosen four flange bolts, which fasten a pump flange and a fuel pump drive gear at the time of the
removal of the fuel pump. When it is loosened, the adjustment of the fuel injection timing becomes very
difficult.
2) Record the position relations of the mark-off lines of the fuel pump and the gear case precisely at the time
of the removal of the fuel pump.