BMW Coupes and Sedans 1970-1988 Repair Guide

Injection Valve

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REMOVAL & INSTALLATION



  1. Disconnect the feed line to the injector with fitting wrenches to avoid damage to the threaded areas.
  2.  
  3. Unscrew the injector valve from the induction sleeve.
  4.  

To install:
  1. Insert injector valve into sleeve and screw into place using a new sealing ring.
  2.  
  3. Connect the fuel feed line to the valve using a new sealing ring. Tighten fitting using a flare-end or fitting wrench.
  4.  

SYNCHRONIZING THE VALVE AND INJECTION PUMP



  1. Make sure that the connecting rod (linkage) between the pump and the throttle valve is adjusted to 3.3 inches (85mm). The length of the connecting rod is measured from the centers of the ball sockets of the connecting rod.
  2.  
  3. Remove the 2 screws for the throttle valve cover and lift off the cover. Rotate the idling speed screw until it is no linger in contact with the eccentric. Loosen the 2 clamping screws.
  4.  
  5. Using a 4 inch (100mm) long piece of metal rod (approximately 0.15 inches (4mm) thick in diameter), bent at a 90° angle at the end. Insert the rod through the upper slotted hole of the regulating lever so that the rod seats in the bore of the injection pump housing.
  6.  
  7. Insert a 0.15 inch (4mm) diameter drift pin into the bore of the throttle valve section Then, with the regulating lever set in position with the metal rod and the throttle valve eccentric pressed against the drift pin, tighten the 2 clamping screws.
  8.  
  9. Remove the drift pin and metal rod and check the synchronization. The synchronization is correct when the eccentric partially overlaps the bore in the throttle valve section.
  10.  
  11. Finally, adjust the idle speed using the screw to approximately 900 rpm.
  12.  
  13. Check the synchronization at full load setting. Disconnect the induction pipe from the No. 1 cylinder. Using the metal rod, insert the rod through the lowest slotted hole of the regulator lever so that the rod seats in the bore of the injection pump housing. Then, adjust the stop screw so that the pump lever is barely contacted.
  14.  

 
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