Idler Gear Hub Failures on 3054C, 3054E, and 3056E Engines [TIBU4161]

BASIC ENGINE

GEAR GP

Idler Gear Hub Failures on 3054C, 3054E, and 3056E Engines

CONFIDENTIAL TIBU4161-02

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TECHNICAL INFORMATION BULLETIN	July 14, 2004
AVSpare Products	3054C (3341-Up) 3054E (3041-Up) 3056E (3561-Up) 315C (ANF1-Up) 924G (DDA1-Up),(DFZ1-Up), (RBB1-Up),(RTA1-Up), (WGX1-Up),(WMB1-Up) 928G (DJD1-Up),(WAC1-Up), (WLG1-Up) AP-655C (CDG1-Up) CB-434D (CNH1-Up) CB-534D (EAA1-Up),(FGH1-Up) CP-433E (ASN1-Up) CP-563E (BWE1-Up),(CNT1-Up) CP-573E (ASY1-Up),(ASZ1-Up) CP-663E (ASF1-Up),(DAF1-Up) CS-423E (AST1-Up) CS-433E (ASR1-Up) CS-533E (DAK1-Up) CS-563E (ASA1-Up),(CNG1-Up) CS-573E (CEB1-Up),(CNN1-Up) CS-583E (CNX1-Up),(DAJ1-Up) CS-663E (ASB1-Up),(DAG1-Up) CS-683E (ASG1-Up),(DAD1-Up) IT28G (DBT1-Up),(EWF1-Up) M313C (BDR1-Up) M315C (BDM1-Up) M316C (BDX1-Up) M318C (BCZ1-Up),(BEB1-Up) M322C (BDK1-Up),(BDY1-Up) TH220B (SLA1-Up) TH330B (SLB1-Up) TH340B (SLC1-Up) TH460B (SLF1-Up) TH560B (SLG1-Up)
	Component Code 1206

SUBJECT: Idler Gear Hub Failures on 3054C, 3054E, and 3056E Engines

PROBLEM:

Excessive wear on the idler gear hub and on the idler gear bushing has been reported.

SOLUTION:

An interim containment for this problem is available. If the bushing in the 232-3668 or the 216-8633 Idler Gear Assembly (1) and the 067-6897 Idler Gear Hub (2) exhibit excessive wear , replace the worn parts with the following newly introduced parts:

1 of the 251-4336 Idler Gear Assembly
1 of the 254-6029 Idler Gear Hub
1 of the 255-1209 Retaining Plate
3 of the 6I-0650 Bolts

The new 251-4336 Idler Gear Assembly contains a new solid brush and the 254-6029 hub material has also changed. A new retaining plate that has longer screws is also included.

Early identification of wear of the idler hub and bushing is possible through Scheduled Oil Sampling (S× O× S). If the level of copper (Cu) exceeds 100 ppm in any 250-hour period, further investigation should be carried out. Other symptoms of the wear problem may include hard starting and white smoke.

Note: The following table lists the commercial and machine engine serial numbers that are affected by this change.

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Engine Sales Model	Engine Type	Affected S/N
3054C	Commercial	33400382-01603
3054C	Machine	CRS00322-02033
3054E	Commercial	3041-Up
3054E	Machine	CRX00330-01741
3056E	Commercial	35600199-00634
3056E	Machine	CPT02266-06884