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COMMERCIAL ENGI NE BUDetroit Diesel Allison

250-C20 CEB-1069LLET IN Overhaul

Indianapolis. Indiana 46 206PAGE 1 OF March 27, lm

CECO MC-40 FUEL CONTROL, SPEE D ROTOR ASSEMBLY -REWORKPLANNING INFORMATION:EFFECTIVITY: All CECO Parts List No. 10 4000 Series Fue l Controlsprior to Serial No. 4AAC2975.REASON: To provide a removable speed rotor screen which willfacilitate cleaning of the speed rotor assembly prior tofinal assembly.DESCRIPTION: The rotor and screen assembly is reworked or replacedand the speed rotor assembly reidentified.COMPLIANCE: Modification is recommended at first repair or overhau l(whichever occurs first) followmg parts availability.APPROVAL:MANPOWER:

FAA-DER Approved.It is estimated that approximately one additional manhouwill be required at time of overhaul.

PARTS AVAIALBILITY:New CECO P/N Nomenclature &tY101151 * Rotor and Screen Assy 196268 ** Screen, Spee d Rotor

z* May be reworked from P/N 96 445Required for rework of P/N 9644; to P/N 101151.INTERCHANGEABILITY: All changes in this bulletin must be accom plishedsimultaneously.TOOLING: NoneWEIGHT AND BALANCE: Not affected.REFERENCES: CW-1144CECO PC0 74-58

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250-C20 CEB-1069OverhaulPage 2COMMERCIAL ENGINE BULLETINCECO MC-40 FUEL CONTROL, SPEED ROTOR ASSEMBLY-REW ORK

ACCOMPLISHMENT INSTRUCTIONS:At first repair or overhaul following parts availability, rework P/N 96445Rotor and Screen Assembly.I. Disassemble fuel control, clean and inspect parts in accordance with250-C20 Overhaul Manual (Appendix Al).

II. Rework serviceable P/N 96445 Rotor and Screen Assemb ly as follows:A. Remove screen and machine rotor and shaft assem bly as follows:

1. Remove as much of the spot-welded-on P/N 96268 Screen (seeFigure 1) as possible by cutting. Use care not to damage rotor.2. Clean up rotor and shaft assembly diameter to remove anyscreen or spot weld remnants by machining 0.762-o. 758 inchdiameter as shown on Figure 2.3. Machine two crimping grooves in rotor and shaft assembly asshown on Figure 2.

B. Assemble and reidentify rotor and screen assembly as follows:1. Assemble and crimp new P/N 96268 Screen onto rotor andshaft assembly as shown on Figure 3.2. Mark the letter E on the end of the shaft (see Figure 3) bychemical or electrolytic etch, or by use of a hand-operatedvibrating scriber.3. Reidentify rotor and screen assemb ly as P/N 101151 by tag-ging or marking container.

C. If rotor and screen assembly cannot be reworked, replace w ithP/N 101151.HI. Reassemble speed rotor assembly in accordance with 250-C20 OverhaulManaul (Appendix Al) and reidentify assemb lies by tagging or markingcontainer was ollows:

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250-C20 CEB-1069OverhaulPage 3COMMERCIAL ENGINE BUL-LETINCECO MC-40 FUEL CONTROL, SPEED ROTOR ASSEMBLY-REWORK

f-ROTOR AND SCREENASSY P.N 464A5

SCREENP,N 96268

P/N 96445 ROTOR AND SCREENFIGURE 1

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250-C20 CEB-1069OverhaulPage 4 COMMERCIAL ENGINE BULLETIN

. vROTOR AND SHAFT p l

ASSEMBLY --7 Il--lJ!/F*

I/ \

L.O.010 MIN R

LA 0.015M I S M A TCH

0.005-0.015 TYPRE F M I S M A TCH

t0.7620.758

(OPTIONAL - STRAIG HTCUT TO DE P TH S HO W N)

M A CHI NE TO TH I SDIA TO CLEAN UPSPOT WELD ANDSCREEN REMNANTSBEFORE CUTTINGGROOVES

MACHINING OF ROTOR AND SHAFT ASSEMBLYFIGURE 2

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250-C20 CEB-1069OverhaulPage 5

COMMERCIAL ENGINE BULLETINCECO MC-40 FUEL CONTROL, SPEED ROTOR ASSEMBLY-REWORK

ASSEMBLE CHAMFE R THIS SIDE:NOGAPBETWEEN SCREEN ANDM AR K (AR KON EN D OF TOR PERMISSIBLESHAFT BY CHEMICALHAFT BY CHEMICAL

OR ELECTROLYTIC ETCHR ELECTROLYTIC ETCHOR BY HAND SCRIBINGR BY HAND SCRIBING

SCREENC R EEN

C R IM P SC R EEN IN T O 1SLOTS 2 PLACES APPROX180 DEGREES APART

P/N 101151 ROTOR AND SCREEN ASSEMBLYFIGURE 3

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250-C20 CEB-1069OverhaulPage6 COMMERCIAL ENGINE BULLETINCECO MC-40 FUEL CONTROL, SPEED ROTOR ASSEMBLY-REWORK

A. Reidentify speed rotor assembIy as P/N 101149.B. Reidentify complete speed rotor assembly as P/N 101152.

IV. Reassem ble fuel control in accordance with 250-C20 Overhau l Manua l(Appendix Al). Record compliance with 250-C20 CEB-1069 in EngineAssem bly (white pages) Mod ification Record, Part lIf of the Eng ineLog Book.

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Z!jO-C20 CEB-1069OverhaulPage 7COMMERCIAL ENGINE BULLETIN

CECO MC-40 FUEL CONTROL, SPEED ROTOR ASSEMBLY-RE WORK

MATERIAL INFORMATION:New P/N Qty Nomenclature Old P,N- Qty Disposition- -101152 1 Rotor Assy, Speed, Complete 96266 1 1101149 1 Rotor Assy, Speed 96267 1 1101151 1 Rotor and Screen Assy 9 6445 1 196268 1 Screen, Speed Rotor 96268 1 2

STOCK DISPOSITION NOTES:1 Rework and reidentify2 Scrap removed part

Li 0. DavidsonService ManagerAircraft EnginesMJK/bsc

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