A. M-Injection Pump With Pneumatic 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:

A. Engine 615, 616 M-injection pump with pneumatic governor

Checking

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




2 Move preglow starter switch on instrument panel to driving position. In this position, at least 2 mm clearance should be available between center axis of adjusting lever and oblong eye (distance "a"). Adjust cable control, if required (30-340).

3 Unscrew injection lines and clamping jaws from cylinder 1 and 2.




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

Attention! For testing beqin 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.

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 hand delivery pump so that fuel flows out of overflow pipe.




8 Rotate crankshaft in direction of rotation until fuel changes into drops at overflow pipe. Formation of drops: One drop per second.

9 In this position, read begin of delivery on graduated scale of 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) is freely running in pressure valve carrier (6).

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

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

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

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

For perfect seat of copper sealing ring tighten pipe connection as follows:

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

Then tighten to 35 Nm.

16 Mount injection lines and clamping jaws and bleed injection system. Service and Repair

17 Run engine and check all connections for leaks.