1982 Plymouth Sapporo Automatic TransFACTORY OEM SERVICE PROCEDURE

Engine Compression

Check compression pressure with engine at normal operating temperature, choke and throttle valves wide open and engine at cranking speed (250 RPM). Crank engine at least 6 "puffs" per cylinder to determine engine compression.

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio
1400 cc 8.81
1600 cc & 2000 cc 8.5:1
2600 cc 8.2:1
Compression Pressure 149 psi (10.5 kg/cm2 )
Maximum Variation Between Cylinders 10%
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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