2011/01/24 Caterpillar

Engine:

G3606 (S/N: 3XF1-UP; 4ZS1-UP)

G3608 (S/N: 4WF1-UP; BEN1-UP)

G3612 (S/N: BKE1-UP; 1YG1-UP)

G3616 (S/N: BLB1-UP; 4CG1-UP)

Engine News, SEBD9365, 29 August 2005, "Specifications For Turbocharger Bearing Clearances". The article has been revised for a conversion specification. Refer to the information below.

ReferenceDisassembly and Assembly, SENR4259, "G3606 and G3608 Engines"Disassembly and Assembly, SENR5535, "G3612 and G3616 Engines"

In order to check the turbocharger bearing clearances, the turbocharger must first be removed from the engine. Then, the turbocharger compressor housing and the turbocharger exhaust housing must be removed. Use the applicable Disassembly and Assembly Module as a reference for performing those procedures.

Illustrations 1 and 2 show the measurement locations for the turbocharger bearing clearances for 3600 Engines. Table 1 identifies the turbochargers. Table 2 provides the specification for the turbocharger bearing clearances.

Illustration 1	g00912348
Measurement of axial clearance (end play) (A) of turbocharger bearings (1) Compressor (2) Turbine (3) Dial Indicator (A) Measurement of axial clearance

Illustration 2	g00912347
Measurement of radial clearance (R) of turbocharger bearings (1) Compressor (2) Turbine (3) Dial Indicator (R) Measurement of axial clearance

Table 1

Turbochargers
TPS57	VTC254
172-6405	106-9709
197-0667	107-0878
228-7328	7C-0428
	7C-0429
	4P-6746
	4P-6747

Table 2

Turbocharger Bearing Clearances
TPS57 Turbochargers
	New Minimum Clearance mm (inch)	New Maximum Clearance mm (inch)	Minimum Clearance for Reusability mm (inch)	Maximum Clearance for Reusability mm (inch)
Axial Clearance (A)	0.12 (0.005)	0.16 (0.006)	0.12 (0.005)	0.21 (0.008)
Radial Clearance (R)	0.72 (0.028)	1.22 (0.048)	0.72 (0.028)	1.31 (0.052)
VTC254 Turbochargers
	New Minimum Clearance mm (inch)	New Maximum Clearance mm (inch)	Minimum Clearance for Reusability mm (inch)	Maximum Clearance for Reusability mm (inch)
Axial Clearance (A)	0.10 (0.004)	0.20 (0.008)	0.10 (0.004)	0.30 (0.012)
Radial Clearance (R)	0.44 (0.017)	0.60 (0.024)	0.44 (0.017)	0.87 (0.034)