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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 27 / 64

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3000

Average Monthly Miles/Bus

2500

2000

1500

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0 Mar-03

Jun-03

Sep-03

Dec-03 Mar-04 Jun-04 Sep-04

Dec-04

Mar-05

Jackie Gleason

West Farms

Figure 8. CNG Bus Fleet Cumulative Average Monthly Mileage per Bus

Figure 9 shows MBRC for CNG buses at both CNG bus depots. The figure shows that for all RCs, the Gleason Depot CNG buses were at or above 4,000 MBRC (as expected/required by NYCT) by April 2004; West Farms achieved this in December 2004. The propulsion-related MBRC for both depots settled around 7,000 MBRC. The most common RCs for the propulsion system were related to the engine, no start, electrical shutdown, or problem indicator lights.

General problems at start-up or within the first year or so of operation were mostly related to the Orion VII bus, rather than the propulsion system, such as axle bolts coming loose and cooling pump failures. Items specific to the CNG bus fleet included:

  • CNG engines were burning excessive amounts of oil—determined to be an engineering and design issue; cylinder kits and sleeves in the process of being changed out

  • Spark plugs were initially a reliability issue (5,000 miles between changes)—changed to a different spark plug; now getting the required 24,000 miles between changes

  • Fuel door switches; being changed out

  • Hydraulic cooling fan motor; changing configuration and motors

  • Had regulator problems; now resolved

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