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 MANUALSCHEVROLET1983SUBURBAN C20, 5.7 M, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - DIESELTESTINGINJECTION NOZZLECHATTER TEST
1983 Chevrolet Suburban C20, 5.7 M, Standard
Chatter Test
1983 Chevrolet Suburban C20, 5.7 M, StandardSECTION Chatter Test
NOTE:
The sound (chatter) for new and used nozzles may vary. With some used nozzles, the chatter is difficult to detect during slow actuation of the hand test stand lever. Some nozzles may chatter louder than others. As long as there is chatter, the nozzle is acceptable.
- Close tester shut off lever at pressure gauge. Slowly depress lever of manual test stand noting whether chatter noises can be heard.
- If no chatter is heard, increase speed of lever movement until it reaches a point where the nozzle chatters. At fast lever movement, the nozzle may emit a "hissing" or "squealing" sound rather than the normal chatter. This is acceptable.
- These sounds indicate that the nozzle needle moves freely and that the nozzle seat, guide and pintle have no mechanical defects.
- Replace any nozzle assembly which does not chatter. Release tester pressure.
RENDER: 1.0x
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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.