B. MW and M/RSF-Injection Pump With Mechanical Governor

.Checking injection pump for begin of delivery (according to low pressure overflow method)

Test Values:

Attention! On MW and M/RSF-injection pumps with mechanical governor, push regulating lever of injection pump to full load while measuring and remove vacuum hose from vacuum box

Tightening Torques:

Special Tools:

B. Engine 615, 616, 617 MW and M/RSF-injection pump with mechanical governor

Testing

1 Clean injection pump on coupling nuts of injection lines and on pipe connections.

2 Pull off vacuum hose on vacuum box.

3 Unscrew injection line from cylinder 1.










4 Unscrew pipe connection (1) of first injection pump element, remove compression spring (3) and pressure valve (4).

Attention! For testing begin of delivery, the copper sealing ring (5) and the pressure valve carrier (6) must remain installed, since otherwise the fuel will continue to flow in spite of begin of delivery position.

Attention! On MW-injection pumps, do not unscrew element connection (2), since otherwise a basic adjustment of injection pump on injection pump test bench will be required.




5 Screw back pipe connection and screw on overflow pipe.

6 Rotate crankshaft in direction of rotation close to begin of delivery in compression stroke of first cylinder.

7 Open vent screw or hollow screw (2) on fuel filter and fill fuel filter with manual delivery pump so that fuel flows out of overflow pipe.


Attention! Push regulating lever of injector pump to full load while measuring and pull vacuum hose from vacuum box.














8 Rotate crankshaft in direction of rotation until fuel on overflow pipe turns to drops. Formation of drops:
One drop per second.







Note: For pipe connections with relief choke (2), on M/RSF-injection pump identified by a ring groove on pipe connection (arrow), no full fuel jet will come out of overflow pipe. However, accuracy of measuring is not impaired.

9 In this position, read begin of delivery at graduated scale on balancing disc and adjust begin of delivery, if required. Adjusting Injection Pump For Begin of Delivery

10 Unscrew overflow pipe and pipe connection.







11 Remove pressure valve carrier (6). Check whether pressure valve (4) runs freely in pressure valve carrier (6).

12 Insert pressure valve carrier (6) with annular groove in downward direction.

13 Mount pipe connection:

a) Engine 615,616, 617 with M/RSF-injection pump

Insert pressure valve (4), new copper sealing ring (5) and compression spring (3).

Check rubber sealing ring (2) for wear and replace, if required.

14 Slightly lubricate pipe connection (1) on threads and screw in.

To obtain a perfect seat of copper sealing ring (5), tighten pipe connection as follows:

Tighten pipe connection to 30 Nm, release again. Tighten once more to 30 Nm and also release again.

Then tighten to 35 Nm.
15 Mount injection lines and locking plate and bleed injection system (07.1-140).

16 Run engine and check all connections fo~ leaks.

b) Engine 616,617 with MW-injection pump

17 Slightlv lubricate pipe connection (1) on threads, screw in and tighten from 40 to 50 Nm in one step.

Attention! The copper sealing ring (5) is installed under pressure valve carrier (6) and need not be replaced.

18 Mount injection line and bleed injection systemService and Repair

19 Run engine and check all connections for leaks. If a pipe connection is leaking, install new pipe connection with annular groove. When installing a new pipe connection, replace copper sealing ring under pressure valve carrier.