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Home >> Volvo >> 1997 >> 850 Base, 4D Wagon, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - Non-Turbo >> Preliminary Inspection & Adjustments >> Mechanical Inspection >> Compression
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Mechanical Inspection: Compression

Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer. See engine analyzer manual for specific instructions.

WARNING: DO NOT  use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate engine oiling system.
COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio 10.5:1
Compression Pressure (Minimum)
850 (B5254S Engine)
Motronic 4.3 170-199 psi (12-14 kg/cm2 )
Motronic 4.4 184-219 psi (13-15 kg/cm2 )
850 R (B5254FT Engine) (1)
(1) Information not available.