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Checking compression - MB/1B/MC-2 engine
Checking compression pressures
- First test with spark plugs tight in all other cylinders
- Minimum oil temperature 30°C
- Throttle valve fixed open
- Disconnect 3-pin connector [1}
- Use non-return (ratcheting) compression gauge
- Double-check vehicle out of gear
- Operate starter with remote control until gauge stops rising
- Tolerance 9 bar to 13 bar, wear limit 8 bar, maximum delta 2.5 bar
- Repeat test with other plugs out - investigate discrepancies
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