Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP1986CHEROKEE LAREDO, 2D UTILITY, 2.5 H, RWD, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - DIESELADJUSTMENTSINJECTION PUMP TIMINGSTATIC TIMING
1986 Jeep Cherokee Laredo, 2D Utility, 2.5 H, RWD, Automatic
Static Timing
1986 Jeep Cherokee Laredo, 2D Utility, 2.5 H, RWD, AutomaticSECTION Static Timing
- Remove screw plug and copper washer from center of 4 high pressure outlets on rear of injection pump. Install Dial Indicator Support (Mot. 856) in place of screw plug. Insert stem of dial indicator into support. See Figure.
- Loosen cold start throttle cable set screw, move levers back slightly, and rotate clevis pin 1/4 turn to disengage cold start system. See Figure.
- Rotate crankshaft clockwise (viewed from front of engine) 1-1/2 turns. Dial indicator will stop moving when injection pump piston is at BDC position. With pump piston at BDC, zero dial indicator.NOTE: With injection pump piston at BDC position, the pump shaft keyway should be positioned just before centerline of No. 1 fuel outlet fitting.
- Remove screw plug from TDC access hole in cylinder block, and install TDC Rod (Mot. 861). See Figure. Slowly rotate crankshaft clockwise, until TDC rod can be inserted into TDC hole in crankshaft counterweight.
- With TDC rod in hole, dial indicator should read .031-.033 in. (.79-.84 mm). This reading represents amount of piston lift. If reading is correct, go to step 8. If reading is incorrect, go to next step.
- To increase piston lift, rotate pump toward engine, and then slowly rotate pump away from engine until correct reading is obtained. To decrease piston lift, slowly rotate pump away from engine until correct reading is obtained.
- Remove TDC rod. Slowly rotate crankshaft clockwise 2 complete revolutions, until TDC rod can be reinserted into TDC hole in crankshaft counterweight. With TDC rod in hole, dial indicator should read .031-.033 in. (.79-.84 mm). If reading is correct, go to next step. If reading is incorrect, repeat steps 6 and 7.
- Remove TDC rod from hole, and install screw plug. Remove dial indicator and support. Install copper washer and screw plug. Compress timing control lever and install clevis pin. Hold lever against clevis, and tighten set screw.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.