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 MANUALSCHEVROLET1985ASTRO VAN M L4-151 2.5LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - 700R4 DIAGNOSING INTERNAL PRESSURE LEAKS
1985 Chevrolet Astro Van M L4-151 2.5L
A/T - 700R4 Diagnosing Internal Pressure Leaks
1985 Chevrolet Astro Van M L4-151 2.5LSECTION A/T - 700R4 Diagnosing Internal Pressure Leaks
TSB 86-61 (Dec)
SUBJECT: 700 R4
SUBJECT: Diagnosing Internal Pressure Leaks
SOLUTION:
To help determine the cause of friction material failure on the 700 R4, you need two pressure gauges that are calibrated the same.
1. Connect Gauge # 1 to main line pressure. Leave it connected for the entire test.
2. Connect Gauge # 2 to the oil circuit that you feel is causing the problem. See illustration for the location of the pressure taps.
3. Gauge # 2 should read within 10 lbs of gauge # 1 when the gauge # 2 circuit is applied. If the variation exceeds 10 lbs, it is an indication of a hydraulic leak in that circuit.
SUBJECT: 700 R4
SUBJECT: Diagnosing Internal Pressure Leaks
SOLUTION:
To help determine the cause of friction material failure on the 700 R4, you need two pressure gauges that are calibrated the same.
1. Connect Gauge # 1 to main line pressure. Leave it connected for the entire test.
2. Connect Gauge # 2 to the oil circuit that you feel is causing the problem. See illustration for the location of the pressure taps.
3. Gauge # 2 should read within 10 lbs of gauge # 1 when the gauge # 2 circuit is applied. If the variation exceeds 10 lbs, it is an indication of a hydraulic leak in that circuit.
RENDER: 1.0x
NO RELATED
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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.