Parts Manual For ISL and ISL03 Engines

2 CBRAKE BY JACOBS™ PARTS MANUAL FOR CUMMINS ISL AND ISL03 ENGINES

Model 490 and 490A Aftermarket Kits

Model 490 and 490A Housing Assemblies P/N Description 3948274 490 front, 12 VDC, S/L 3948275 490 rear, 12 VDC, S/L 3963794 490A front, 12 VDC, S/L 3963795 490A rear, 12 VDC, S/L Ill. No. P/N Description Quantity/Group 1 4024748 Slave piston 7/8 3 2 4024749 Slave piston spring 3 3 3871410 Spring retainer 3 4 3871373 Retaining ring 3 5 4024750 Master piston, 5/8 dia. 3 6 4024751 Flat spring 3 7 4024752 Plain washer 6 8 4024753 Hex head screw 3 9 3871372 Control valve 3 10 3871364 Control valve collar 3 11 3871345 Cont. valve spring (orange) 3 12 4024754 Outer control valve spring 3 13 4024755 Retaining ring 3 14 4024756 Piston, Accumulator 1 15 4024757 Spring, Accumulator 1 16 3871379 Hex jam nut 3 17 4024758 D-Lash screw assembly 3 18 4024759 Solenoid valve (12 V, S/L) 1 19 3871638 Upper seal ring 1 20 4026537 Center seal ring 1* 21 3871218 Lower seal ring (490 only) 1 22 3871367 Spring, check valve 1 23 3871370 Ball, check valve 1 24 3871368 Retainer, check valve 1 25 3871369 Retaining ring, check valve 1 26 4024761 Sleeve, Housing adjusting 3 NI 3948278 Harness,solenoid (490 only) 1

* Not used in 490A housings

S/L = Single LeadD/L = Dual LeadNI = Not Illustrated

Application NotesThe Model 490 and 490A CBrake by Jacobs™ engine brake is designed and approved for use on Cummins ISL and ISL03 engines. Information in this manual was current at the time of printing and is subject to change without notice or liability. Model 490 CBrake by Jacobs™ engine brake has been superceded by Model 490A.

Refer to Cummins service information and instructional literature for specific application information.

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P/N Brake Model Engine Desc.4089653 490 ISL 12VDC Kit4089626 490A ISL03 12VDC Kit

Brake Housing Compatibility

ISL ISL03

490 Yes No 490A Yes Yes

CBRAKE BY JACOBS™ PARTS MANUAL FOR CUMMINS ISL AND ISL03 ENGINES 3

ISL98 Specific Attaching PartsISL98 12V Spacer Group 4 3948280 Spacer, 12V 15 3073972 Electrical Connector 1 6 3936996 Stud, Spacer mounting 5N/I 3965548 Gasket, Valve Cover 1

ISL98 Control Group N/I 3948169 Wire Harness 1 N/I 3948371 Bracket 1N/I 3913638 Cap Screw 1N/I 3871501 Cab Control Group 1 7 3948278 Rear Housing Wire Narness 10-1/2" long 2

ISL98 12V Valve Cover Some valve covers are not engine brake compatible and will need to be replaced during installation. Please verify your valve cover is compatible.

Engine BrakePart Number Description Compatible 3945615 Front Oil Fill, Valve Cover No 3945436 Front Oil Fill, Valve Cover Yes 3945834 Rear Oil Fill, Valve Cover Yes 3945833 Rear Oil Fill, Valve Cover No 3945970 Rear Oil Fill, Valve Cover Yes 3945971 Front Oil Fill, Valve Cover Yes

ISL98/ISL03 Engine Attaching Parts Group Ill. Quantity perNo. Part Number Description Group

1 3945236 Crosshead 6 2 3945239 Spherical Cap 6 3 3945240 Brake spacer 6 N/I 3945241 Washer, 8mm 6 N/I 3945232 Oil Supply Screw (intake rocker stud) 2N/I 3945326 O-ring,Oil Supply 2 N/I 3945228 Nut, Exhaust rocker arm adjusting 6N/I 3945231 Studs, Exhaust rocker lever 6N/I 3927064 Screws, Engine brake mounting 12

Common Attaching Parts

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Enlarged View

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7 P/N 3964781: Flat Terminal colored light blue

P/N 3948278: Flat Terminal colored black

Jacobs Vehicle Systems22 East Dudley Town RoadBloomfield, CT 06002U.S.A.

Cummins Inc.Box 3005Columbus, IN 47202-3005U.S.A.

CELECT™ is a trademark of Cummins Inc.Bulletin 3401838Printed in U.S.A. 7/05© 2005 Cummins Inc. and Jacobs Vehicle Systems

Service Parts Ill. No. P/N Description

N/I 3800917 Tune Up Kit 8 3871551 Oil Pressure Test Kit N/I 3163681 Feeler Gage (0.090") 9 3871654 Slave piston removal tool N/I 3824591 Engine Barring tool N/I 3376392 6 in lb Torque Wrench

For additional information please visit: www.jacobsvehiclesystems.comP/N 026301 Rev. C

ISL03 Specific Attaching PartsISL03 12V Valve Cover (Valve Cover is not in aftermarket kit, needs to be ordered separately)Ill. Quantity perNo. Part Number Description Group N/I 3967777 Front Oil Fill, Valve CoverN/I 3967773 Rear Oil Fill, Valve CoverN/I 3967776 No Oil Fill, Valve CoverN/I 3959799 Isolator 1N/I 3959798 Valve Cover Gasket 1N/I 3942135 Filler Cap 1N/I 3900632 Valve Cover Bolts 8

ISL03 Rocker Housing Group N/I 3969493 Rocker Housing 1N/I 3966708 Gasket 1N/I 3073972 Electrical Connector 2N/I 3901447 Rocker Box Mounting Bolts 7

ISL03 Control Group N/I Wire HarnessN/I 3969631 Wire Harness 1 N/I 3948371 Bracket 1 N/I 3913638 Cap Screw 1

Solenoid Harness7 3964781 Front Housing 12-1/2" long 17 3948278 Rear Housing 10-1/2" long 1

N/I Dash SwitchesN/I 3871501 On Off Group 1N/I 3871244 Switch Plate 1N/I 3871459 Switch 1N/I 3871500 Hi Low Group 1N/I 3871499 Switch Plate 1

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