Printed in Canada

Service Bulletin No.2902MODEL TYPE SECTION/GROUP DATE

SUBJECT

CONDITIONS

Mar. 30, 2005D / E / J Series Coaches Service Information 4--Air Systems

AIR DRYERS

Parts may be purchased from MCI Service Parts, Louisville, Kentucky or from MCIService Parts, Newcastle, Ontario.

Description:The following bulletin provides information on the two versions of the Bendix ADIP dryer installed on D / E / J modelcoaches and the Haldex dryer installed on E and J model coaches.Care should be taken not to confuse the Bendix dryers, as their internal functions are different. The Bendix ADIP dryer isdesigned to cut off the inlet air supply from the compressor to the dryer while the compressor is unloaded. This dryerwas only usedwith the Bendix Tu-Flow 750 compressor. The Bendix ADIP-DLU dryer utilizes the purge valve to bleed offexcess air instead of unloading the compressor. This dryer is only used with the Bendix BA-921 compressor.BothBendix dryers are identical in appearance; however, theADIP-DLUdryer requires amuffler,while theADIPdoesnot.The ADIP dryer utilizes a purge valve with three o-rings. The ADIP-DLU purge valve contains only two o-rings. If a twoo-ring purge valve is installed on a coach requiring an ADIP dryer, the air inlet to the dryer will not be cut off during theunloading cycle, but will be exhausted through the bottom of the dryer. If a three o-ring purge valve is installed on acoach requiring an ADIP-DLU dryer, the BA-921 compressor will continue to build pressure in the line between thecompressor and dryer after the coach pressure is obtained. One of the two pressure protection valves will blow. A loudrepeating popping noise will be heard emitting from the compressor or dryer. This set-up will eventually lead to heavycarbon deposits in both the line leading from the compressor to the dryer, as well as the dryer itself.If an ADIP dryer has been installed on any unit running a BA-921 compressor, the purge valve can simply be replacedwith a two o-ring purge valve. A muffler kit must also be added. If the BA-921 compressor pressure protection valve ordyer pressure protection valve has blown at any time, they must be replaced.The system must be inspected to ensure the carbon deposits are removed for proper air flow. Carburetor cleaner andcompressed air can be used to remove deposits from the air lines once the entire system has cooled to ambienttemperature. Pay particular attention to the 90degree fittings. If the ADIPdryer has been pluggedwith carbondeposits,replace it with a new ADIP-DLU dryer.The table below will assist customers by identifying factory installed air dryers, purge valves and compressor types bymodel and effective unit number cut-in.

Model Unit Number Range Air Dryer Purge Valve Compressor TypeE4500/J4500 60001-62097 Bendix ADIP (04-19-1001) 04-19-1024 Bendix 750 Tu-FlowE4500/J4500 62098-62717 Bendix ADIP-DLU (04-19-1046) 04-19-1118 Bendix BA-921E4500/J4500 62718-Current Haldex (04-01-1001) 04-10-1013 Bendix BA-921D4000/D4500 53394-55605, 55680-55689 Bendix ADIP (04-19-1001) 04-19-1024 Bendix 750 Tu-FlowD4000/D4500 55606-55679, 55690-Current Bendix ADIP-DLU (04-19-1046) 04-19-1118 Bendix BA-921

REFER TO MANUALPrior to returning the coach to service, refer to Section 4 in the MCI Maintenance Manual, for specificinformation relating to inspecting and testing the compressor, air dryer, and governor for correct

operation.

A Service Parts Chart is also provided in this bulletin, identifying service replacement parts for the air dryers usedon D, Eand J model coaches.

Printed in Canada

PAGEDATE 2MAR. 30, 2005Service Bulletin No. 2902

D / E / J Coach with Bendix 750 Tu-Flow Compressor and Non--EGR S60 and C12 EngineQty. New P/N Description1 04-19-1001 Dryer, Air, Bendix ADIPService Parts for Bendix ADIP Air DryerQty. New P/N Description1 04-19-1018 Del Check Valve Kit1 04-19-1019 Heater Kit, 24V1 04-19-1024 Purge Valve Kit ( 3 o-rings ) ( Figure 1 )1 04-19-1021 Bolt Kit1 04-19-1022 Mtg Bracket Kit1 04-19-1023 Desiccant Cartridge1 04-19-1026 Valve, Dryer Pressure Protection

E / J Coach with Bendix BA921 Compressor and EGR S60 and C12 / C13 EngineQty. New P/N Description1 04-19-1046 Dryer, Air, Bendix ADIP-DLUService Parts for Bendix ADIP-DLU Air DryerQty. New P/N Description1 04-19-1023 Desiccant Cartridge1 04-19-1019 Heater Kit, 24V1 7L-12-2473 Harness & Splice Kit1 04-19-1026 Valve, Dryer Pressure Protection1 04-19-1118 Purge Valve Kit ( 2 o-rings ) ( Figure 1 )1 4L-19-351 Muffler Kit1 4L-7-154 Valve, BA-921 Compressor Pressure Protection

D Coach with Bendix BA921 Compressor and EGR S60 and C12 / C13 EngineQty. New P/N Description1 04-19-1046 Dryer, Air, Bendix ADIP-DLUService Parts for Bendix ADIP-DLU Air DryerQty. New P/N Description1 4L-19-236 Bracket, Air Governor1 4L-8-1 Governor1 04-19-1118 Purge Valve Kit ( 2 o-rings ) ( Figure 1 )1 04-19-1023 Desiccant Cartridge1 04-19-1019 Heater Kit, 24V1 7L-12-2473 Harness & Splice Kit1 04-19-1026 Valve, Dryer Pressure Protection1 4L-19-351 Muffler Kit1 4L-7-154 Valve, BA-921 Compressor Pressure Protection

E / J Coach with Bendix BA921 Compressor and EGR S60 and C13 EngineQty. New P/N Description1 04-01-1001 Dryer, Air, Haldex with Intregrated GovernorService Parts for Haldex Air DryerQty. New P/N Description1 04-10-6021 Desiccant Cartridge Kit1 04-10-6022 Safety Valve Kit1 04-10-1011 Check Valve Kit1 04-10-1012 Valve Pack Kit1 04-10-1013 Regeneration Valve Kit1 04-10-1014 Turbo Protection Valve Kit

Printed in Canada

PAGEDATE 3MAR. 30, 2005Service Bulletin No. 2902

Service Information:1. New parts will be available for service replacement.

Figure 1. 04--19--1118 purge valve o-ring locations ( 2 ).

Figure 2. 04--19--1024 purge valve o-ring locations ( 3 ).Procedure complete.