Lombardini CHD series - Injection Pump Delivery Adjustment; How to reassemble injection pump feeding tubes; Instrument for equalizing injection pump delivery; Injection pump delivery equalization

- 69 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
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How to reassemble injection pump feeding tubes
1 Pliers for 6 mm diam. tubes (intake) - Part No. 7104-1460-
022
2 Pliers for 8 mm diam. tubes (discharge) - Part No. 7104-
1460-023
Feedinganddischargetubesaremadeofnylon;theytintothe
injection pump unions by exerting pressure and using special
pliers and a plastic hammer.
The nylon tubes can no longer be used after disassembly.
Replace them every time they are removed.
Instrument for equalizing injection pump delivery
Part No. 7104-1460-090
Components: 1 Tank 2 Test tube
3 Support 4 Switching lever
5 Injection pump discharge tube cut-off valve
6 Injection pump intake tube-off valve
A Tube for connection to injection pump intake union
B Tube for connection to injection pump discharge union
Removefeedtubesfromallinjectionpumpsandttheinstrument
tubes making sure that each pump has its own intake and
discharge tubes. Connect the instrument A with the engine A and
the instrument B with the engine B. Proceed in a similar manner
with the other pumps.
Injection pump delivery equalization.
After checking the injection advance go ahead with the delivery
balancing of the pumps.
Before connecting the tool serial number 7104-1460-090 to the
pumpsandrellingtank1 with fuel, set it to a higher level of at
least 200 mm than that of the pumps themselves.
Open taps 5 and 6 and start the engine, set the engine to an idling
speed of 2000 rpm. Switch the engine feed from tank 1 to the tubes
2 using the switching lever 4g.163.
Aftertherstminute(minimumtestingtime),verifythatthelevel
between the highest and lowest levels in the tubes is not more
than 2 cm³.
At this point, it is possible to either reduce the delivery of the
pump that consumes most (tube with the lowest level) or increase
the delivery of the pump that consumes the least (tube with the
highest level).
To vary the delivery of the pumps, rotate slightly in one direction or the other at the injection pumps.
Unscrew the fastening screws of the pump to be adjusted by a quarter of a turn.
Rotating clockwise the delivery is increased, anti-clockwise the delivery is reduced.
 Onceadjustmentisnished,tightenthefasteningscrewsto25Nm.
Important
Whenever an injection pump is disassembled or replaced, delivery balancing must be carried out.
Note: A reference notch is located between the pump ange and its mounting on the crankcase. If one or more pumps are
disassembled and reassembled do as follows:
- Makeareferencemarkingonthefasteningangesoftheinjectionpumpsandonthebaseplanesofthecrankcase.
- Leave the shims for injection timing setting under each pump unchanged.
- Each pump should be reassembled in its own housing.
 Alignthedeliveryreferencenotcheslocatedonthepumpangewiththoseonthecrankcase.
Fuel system