A New Integral Seal is Now Available for Certain 3524B Engines {1151, 1157, 1162, 1166, 1206, 3279, 7555} Caterpillar

A New Integral Seal is Now Available for Certain 3524B Engines {1151, 1157, 1162, 1166, 1206, 3279, 7555}

Usage:

Engine: 3524B (S/N: CND1-449; NPM1-569)

A new integral seal is now available for certain 3524B Engines. A new gasket design using a metal carrier with edge bonded rubber sealing has been introduced for 3524B Engines for the front engine to rear housing, and the rear engine to front housing joints.

This gasket eliminates the need to retorque these housings after an initial run in period. The new 503-0090 Integral Seal (gasket) is thicker than the current 309-4550 Gasket, the existing 345-0592 Flywheel Housing, and 345-0594 Front Drive Housing can be reworked to install the new gasket.

The new integral seal is adaptable to the products within the listed serial numbers.

The new and former part numbers are listed in Table 1.

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Table 1
Qty	New Part number	Part Name	Former Part Number⁽¹⁾
2	503-0090	Integral Seal	309-4550
1	511-9065	Flywheel Housing	345-0592
1	512-5750	Front Housing	345-0594

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⁽¹⁾	The former part number listed is for reference only and may differ.

Note: Special Instruction, REHS4838 , "Replacing the Gaskets on the Flywheel Housing and Coupling Housing on 797 and 797B Off-Highway Truck Engines" does not have to be performed on the engine serial numbers given in Table 2before first fit in chassis, the extended dyno, and retorque is performed at the factory.

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Table 2
Effective Engine serial Numbers for the above note
(S/N: NPM00547-00569)
(S/N: CND00448-00449)

Field Housing Rework

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Illustration 1	g06246759
345-0594 Front Drive Housing rework (A) 488.60 mm (19.236 inch) (B) 487.00 ± 0.25 mm (19.170 ± 0.010 inch) (C) 22.00 mm (0.866 inch)

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Illustration 2	g06246751
345-0592 Flywheel Housing (rear housing) rework (D) 217.70 ± 0.25 mm (8.571 ± 0.010 inch)

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Illustration 3	g06247978
Additional information for where to stop the cut on 345-0594 Front Drive Housing (E) 232.00 mm (9.130 inch) (F) 50.8 ± 0.50 mm (2.00 ± 0.019 inch) (G) 63.70 mm (2.507 inch) (H) 124.10 mm (4.886 inch) (J) 515.90 mm (20.311 inch) (K) 576.29 mm (22.688 inch)

Current housings may be reused by removing 1.60 mm (0.063 inch) from the surface which engages the engine block profile, deburr the bolt holes after machining.

Apply Loctite 243 to all bolts, and install using appropriate torque values. Refer to Disassembly and Assembly , RENR2276 , "3524B Engine for Caterpillar Built Machines" for correct torque values.

Note: Flatness must be 0.10 mm (0.004 inch) with a surface finish of 3.2 μm (125 micro inch). Mark any reworked housing with the appropriate new part number.