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 MANUALSBMW2008M5 (E60) V10-5.0L (S85)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTUNE-UP AND ENGINE PERFORMANCE CHECKSCOMPRESSION CHECKTESTING AND INSPECTION
2008 BMW M5 (E60) V10-5.0L (S85)
Compression Check: Testing and Inspection
2008 BMW M5 (E60) V10-5.0L (S85)SECTION Testing and Inspection
11 00 039 - Checking compression of all cylinders (S85)
Special tools required:
- 11 0 224 11 0 220 Compression Test Kit
- 11 0 235 11 0 220 Compression Test Kit
Important!
High tension - mortal danger!
Disconnect all supply leads from ignition coils (interrupt power supply to ignition coils).
Check Schrader valve on special tool 11 0 235 11 0 220 Compression Test Kit for correct seating (engine damage).
The throttle valves cannot be opened by opening the throttle.
A compression check is carried out exclusively by means of the idle actuators.
A compression check is only possible with the diagnosis tester.
Necessary preliminary tasks:
- Remove microfilter housing Removing and Installing/Replacing Left or Right Microfilter Housing Lower Section.
- Release coolant tank and place to one side
- Remove all spark plugs Service and Repair.
- Connect diagnosis tester.
-
-1. - Service function.
2. - Drive.
3. - Engine electronics
4. - Switch off fuel injection.
Important!
Fuel injectors are switched off.
5. - Actuate starter motor for 8 seconds.
Screw special tool 11 0 235 11 0 220 Compression Test Kit into spark plug hole.
Check that sealing ring is in perfect condition on special tool 11 0 235 11 0 220 Compression Test Kit.
Connection (1) for diagnosis tester or special tool 11 0 224 11 0 220 Compression Test Kit.
Connect special tool 11 0 224 11 0 220 Compression Test Kit or 25 bar pressure adapter to diagnosis tester.
Compression pressure Engine in General S85.
Now clear the fault memory.
RENDER: 1.0x
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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.