New Valve block Problems identified:
about 12m ago invested in a new valve block (from AirBag Man) because the solenoids in the original were shot...
New Symptoms:
1.
the dreaded front end traffic light dance and constant compressor operation began in ernest recently.
Relay #20 OK etc etc, had already removed offending thrust washer from compressor motor several months ago (Ref Falconworks fix)
2. Losing height (50-70mm) over night...
3. Pulled delay timer and totally isolated valveblock with ballcock valves in the bypass system. Result: vehicle maintained height within 3mm for a week!
4. No sign of external air leak from valve block (ballcocks open, delay timer reinserted etc)
TOTALLY FRUSTRATED...
Thanks to all for hints in other posts re. the three non-return valves... so,, on a hunch:
5. Removed valve block yesterday afternoon and opened up non-return valve section only.
6. Examined valve seats and o-rings minutely with high power mag glass in Swiss Army knife (Magiver eat your heart out :lol: )
RESULT: seating contact surface of o-rings appeared coated/=contaminated? with a silvery substance. Non contact surface very clean..
Didn't have heart to open my brand new set of o-rings from Dennis, so removed existing rings and refitted them upside down... cleaned mating surface with cotton bud dipped in disc brake cleaner...
7. Reassembled valve block and went on 40km drive...
8. compressor filled totally depleted tank in 7 mins 22 secs, minimal compressor operation during drive.
9. Measured heights last night, again midday today and tonight... less that 1 mm difference :shock:
Lessons Learned: Beware the dreaded non-return valves :!: :clap: