Case 1150B Crawler Dozer Service Manual

Table of Contents

1. General
2. Engines
3. Fuel System
4. Electrical System
5. Track System
6. Power Train
7. Brakes
8. Hydraulic System
9. Mounted Equipment

Manual Extract

The fuel injector is a closed end (injector valve does not project through an opening in the injector tip) differential pressure, hydraulically operated hole type injector.
The fuel injectors are located in the cylinder head – one for each cylinder. It is the function of the fuel injector to direct a metered quantity of fuel received from the injection pump to the combustion chamber. Each charge of fuel must be delivered into the combustion chamber with a definite spray pattern to insure complete combustion and efficient engine performance.
IMPORTANT: The injector body and valve is a mated assembly, accurately lapped to a very close fit for precise metering of fuel to each cylinder. The body or valve cannot be installed individually for service. If it is necessary to replace either the valve or body, replace the complete assembly.

IMPORTANT: Do not mix valves and bodies while disassembling the injector.

INJECTOR BODY – Houses the injector parts in their correct position in the cylinder head.
The part of the injector body which projects into the Cylinder head is Teflon coated to prevent sticking.
INJECTOR VALVE – Controls the flow of fuel from the injector.
VALVE GUIDE – Supports and guides the movement of the valve in the body.
OPENING PRESSURE CONTROL SPRING –
Controls fuel pressure necessary to lift the valve from its seat.
PRESSURE ADJUSTING SCREW –
Compresses the opening pressure control spring to maintain a predetermined spring pressure on the valve.
LIFT ADJUSTING SCREW –
Controls the valve travel distance.
INJECTOR TIP –
Contains the valve seat and four spray orifices which direct the fuel spray in the combustion chamber.
CARBON SEAL –
Prevents carbon accumulation in the cylinder head openings.
COMPRESSION SEAL –
A nylon seal under the inlet fitting that prevents engine compression leakage.