1987 Ford Cab & Chassis 5.8 H, 4WD, AutomaticFACTORY OEM SERVICE PROCEDURE

Compression Specifications (6.9L)

COMPRESSION SPECIFICATIONS (6.9L)

Application Specification
Compression Ratio 20.7:1
Maximum Pressure Variation (1)
260 psi (18.3 kg/cm2 ) 195 psi (13.7 kg/cm2 )
280 psi (19.7 kg/cm2 ) 210 psi (14.8 kg/cm2 )
300 psi (21.0 kg/cm2 ) 225 psi (15.8 kg/cm2 )
320 psi (22.5 kg/cm2 ) 240 psi (16.9 kg/cm2 )
340 psi (23.9 kg/cm2 ) 255 psi (17.9 kg/cm2 )
360 psi (25.3 kg/cm2 ) 270 psi (18.9 kg/cm2 )
380 psi (26.7 kg/cm2 ) 285 psi (20.0 kg/cm2 )
400 psi (28.1 kg/cm2 ) 300 psi (21.0 kg/cm2 )
420 psi (29.5 kg/cm2 ) 315 psi (22.1 kg/cm2 )
440 psi (30.9 kg/cm2 ) 330 psi (23.2 kg/cm2 )
(1) Left column represents highest cylinder reading. Right column represents lowest cylinder reading.
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  • • 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.

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