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Engine Compression

  1. Warm engine to normal operating temperature. Remove all spark plugs. On Navajo, use remote starter switch to crank engine (DO NOT crank engine with ignition switch). On B4000, disconnect ignition coil primary wire connector.
  2. On all models, hold throttle plate fully open. Crank engine, and note compression pressure.
COMPRESSION RATIO

Application Specification
B4000 9.0:1
Navajo 9.0:1
COMPRESSION SPECIFICATIONS

Application Minimum psi (kg/cm2 ) @ RPM Standard psi (kg/cm2 ) @ RPM
B4000 134 (9.3) @ 300 250 (17.3) @ 300
Navajo N/A (1)
(1) Lowest compression reading should not be less than 75 percent of highest compression reading.