Case Drott 40 Series E Excavator Service Manual

Table of Contents

1. Table of Content
2. General
3. Engine
4. Fuel System
5. Electrical System
6. Crawler Undercarriage
7. Power Train
8. Brake System
9. Hydraulic System
10. Chassis & Mounted Equipment

Manual Extract: Fuel Manifold

pipes connected to the fuel inlet manifold. Excess fuel oil is returned to the fuel tank from the fuel injectors through pipes connected to the fuel outlet manifold.

The fuel inlet- and outlet manifolds are an integral part of the current cylinder heads (Fig. I). Since there are inlet and outlet passages provided opposite each injector position in the side of the head as well as at each end, greater flexibility is permitted in the installation of the fuel lines to the fuel manifolds. The fuel passages are identified by the words “IN” (top manifold) and “OUT” (bottom manifold) cast in several places in the side of the cylinder head.

The fuel manifold connectors are assemblied to the integral fuel manifold cylinder head, using special steel sealing washers, and tightened to 40-45 lb-ft (5461 Nm) torque.

The former external fuel manifolds were attached to the side of the cylinder head and locked in position by fuel connectors which set in tapered seats in the fuel manifold tee connectors .
The fuel manifold connectors used with the former external fuel manifolds were assembled to the cylinder head with a copper sealing washer and a lock nut which incorporated a threaded fibre insert .

Later, an unthreaded fibre insert was used and the nut was installed with the fibre end down. Threads were cut into the insert when the nut was assembled to the connector and provided a more effective seal against leakage of lubricating oil to tlie outside of the cylinder head. In a later change, the staking operation, which secured the insert in place, was omitted from the nut.

This provided a smooth sealing surface on the nut and the copper washer was eliminated. However, a one-piece connector which incorporated a nylon insert replaced the former connector and nut. When the connector is installed, the nylon insert effects a complete seal between the threads of the connector and the cylinder head.

A special fitting with a restricted opening is used in the fuel outlet manifold to maintain the proper pressure within the fuel system. Refer to Section 13.2 for the size of restriction used.