GM Cutlass RWD 1970-1987 Repair Guide

Injection Nozzle



  1. Remove the fuel return line from the nozzle.
  3. Remove the nozzle hold-down clamp and spacer using tool J-26952.
  5. Cap the high pressure line and nozzle tip.

The nozzle tip is highly susceptible to damage and must be protected at all times.

  1. If an old nozzle is to be reinstalled, a new compression seal and carbon stop seal must be installed after removal of the used seals.
  3. Remove the caps and install the nozzle, spacer and clamp. Torque to 25 ft. lbs. (33 Nm)
  5. Replace the return line, start the engine and check for leaks.

Injection nozzle seat tightness check Diesel Equipment and CAV Lucas injectors require different inlet fitting torques

1980 & Later

The injection nozzles on these engines are simply unbolted from the cylinder head, after the fuel lines are removed, in similar fashion to a spark plug. Be careful not to damage the nozzle end and make sure you remove the copper nozzle gasket from the cylinder head if it does not come off the nozzle.

Clean the carbon off the tip of the nozzle with a soft brass wire brush and install the nozzles, with gaskets.

1981 and later models use two type of injectors, CAV Lucas and Diesel Equipment. When installing the inlet fittings, torque the Diesel Equipment injector fitting to 45 ft. lbs. (61 Nm) and the CAV Lucas to 25 ft. lbs. (33 Nm)