Tune-up Kit Instructions For N14 Plus Engines

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ByTMTune-up KitInstructions ForN14 Plus Engines

Tune-up Kit ContentsIll. 836QuantityControl valve retain. ringControl valve coverOuter cont. valve springInner cont. valve springControl valve collarControl valve spool assy.Solenoid harnessUpper seal ringCenter seal ringLower seal ringFlat springPlain washerHex head cap screwGasket, brake housingTune-up Kit Instructions666666333366631InstructionsFor additional information on CBrake by Jacobs Models 455B and 455C engine brakes, refer to CumminsInstallation Manual, Bulletin 3698823. Previous Model 455Ahas been discontinued. Model 455A can be upgraded toModel 455B by using current Robo-Lash , P/N 3871699.Use OSHA-approved cleaning solvent for cleaning parts.Original parts to be reused should be inspected for wearand replaced as required. Wear safety glasses whereindicated.Access Engine BrakeNEVER REMOVE ANY ENGINE BRAKECOMPONENT WHILE THE ENGINE ISRUNNING. PERSONAL INJURY MAYRESULT.Not Illustrated1.Thoroughly clean the engine and brake housings.2.Disconnect the wire harnesses at the engine brakehousings (3 places).3.Remove parts in this order: rocker lever covers, covergaskets, housing mounting screws, engine brakehousings.4.Remove and discard the engine brake housinggaskets (24).Disassemble Housings1.Remove the solenoid harness (7) and valve (8);discard the harness and three seal rings (9, 10, 11).CONTROL VALVE COVERS (2) ARE UNDERTENSION FROM THE CONTROL VALVESPRINGS (3, 4). REMOVE THE COVERSCAREFULLY AND WEAR SAFETY GLASSES.22.Press down on the control valve cover to relieve springpressure. Remove the retaining ring (1) using retainingring pliers. Remove and discard the cover (2), springs(3, 4), collar (5), control valve (6) and retaining ring (1).3.Remove the master piston (20) using needle-nosepliers; discard the flat spring (21), washer (22) andcapscrew (23). Save the master piston.CBRAKE BY JACOBS TUNE-UP KIT INSTRUCTIONS FOR CUMMINS N14 PLUS ENGINES

3.WEAR SAFETY GLASSES. THE SLAVEPISTON (14) IS RETAINED BY SPRINGS (15,16) THAT ARE UNDER HEAVY COMPRESSION. IF THESE INSTRUCTIONS ARE NOTFOLLOWED AND PROPER TOOLS NOTUSED, THE SPRING COULD BE DISCHARGED WITH ENOUGH FORCE TOCAUSE PERSONAL INJURY.4.Remove the locknut (13) from the slave pistonadjusting screw (Robo-Lash ) (12) and back outthe screw until the slave piston is fully retracted(screw is loose).5.Install the slave piston tool, Cummins P/N 3871654,(Fig. 2), with the adjusting screw fitted into the hole inthe tool.Install the original slave piston, reversing the removalprocedure. Use the slave piston tool. Be sure theretaining ring is placed on the retainer before screwingthe tool down over the slave piston.BEFORE REMOVING THE SLAVE PISTONTOOL, ROTATE THE RETAINING RING 90 FROM THE SLOT IN THE HOUSING. DONOT LEAVE THE OPEN PORTION OF THERETAINING RING ALIGNED WITH THEOPENING IN THE HOUSING AS THIS WILLPERMIT THE SPRING RETAINER TOBECOME LOOSE DURING ENGINE BRAKEOPERATION. SERIOUS ENGINE DAMAGEWILL RESULT.4.Remove the slave piston tool and install the adjustingscrew locknut (do not compress the slave piston andsprings).5.Install new control valves, collars (note “UP” position),springs, covers and retaining rings. Rotate theretaining ring at least 90 from the slot in the housing.FIG. 2UP6.Turn the handle slowly until the retainer is depressedabout 0.040” (1 mm), relieving the pressure againstthe retaining ring (18).7.Back out the tool until the springs are loose. Removethe slave piston tool and then remove the retainer (17),springs (15, 16), slave piston (14) and adjusting screw(12).Assemble Housings1.Clean the housing and all parts in cleaning solvent. Drywith compressed air.2.Coat all parts to be installed into the housings withclean lube oil.FIG. 36.Install the original master pistons with new flat springs,washers and capscrews.NOTE:WHEN TIGHTENING THE SCREW, BE SURETHAT THE SPRING LEGS ARE CENTEREDAROUND THE MASTER PISTON BOSS.7.Install the lower (smallest) solenoid seal ring (11) in thebottom of the solenoid valve bore and the upper (9)and center (10) seal rings on the solenoid valve. Besure the seals are seated properly and carefully screwthe solenoid into the housing without unseating theseals. Torque the valve to 15 lb.-ft. (20 N m). Becareful not to twist the seals while installing.8.Connect the new solenoid harness from the solenoidvalve to the electrical connector.CBRAKE BY JACOBS TUNE-UP KIT INSTRUCTIONS FOR CUMMINS N14 PLUS ENGINES3

Engine BrakeOperational CheckThe CBrake by Jacobs tune-up kit installation is nowcomplete. Reconnect and test the retarder using theprocedures listed below.1.Connect the wire harnesses to the electrical connectoron the engine brake housings.WEAR SAFETY GLASSES. DO NOT EXPOSEYOUR FACE OVER THE ENGINE AREA.TAKE PRECAUTIONS TO PREVENT OILLEAKAGE ONTO THE ENGINE. WHEN THEENGINE IS RUNNING AND THE VALVECOVERS ARE REMOVED, OIL SPLASHINGIN THE ENGINE BRAKE AREA COULDCAUSE PERSONAL INJURY.2.To bleed the brake units and check their operation,start the engine and allow to run for 5 to 10 minutes.3.With the engine brake switch off, accelerate theengine to approximately 1800 RPM.4.Release the throttle and manually depress eachsolenoid disk at the top of the solenoid.5.Repeat this procedure five or six times to permitengine oil to fill the brake housings.6.To check the electrical system on CELECT engines,leave the engine running. Put the selector switch inposition 1 and turn the ON/OFF switch to ON. TheCELECT low-speed shut off prevents the enginebrake from coming on at idle. Accelerate the engineto approximately 1800 RPM and release the throttle.In position 1, the center solenoid should operate.Repeat this procedure for positions 2 and 3. Inposition 2, the front and rear solenoids shouldoperation; in position 3, all three solenoids shouldoperate. Shut down the engine.7.Reinstall the Cummins rocker lever cover gaskets. Besure the word “TOP” is facing up. Replace the rockercovers and all previously removed parts. Torque thecapscrews to 9 lb.-ft. (12 N m).5CBRAKE BY JACOBS TUNE-UP KIT INSTRUCTIONS FOR CUMMINS N14 PLUS ENGINES

Install Housings2.1.Before installing the housings, make sure the slavepiston adjusting screws (Robo-Lash ) is backed out,allowing the slave piston to bottom in the housing bore(screw is loose).2.Position the three gaskets on the rocker leverhousings.3.Install the three engine brake housings on the rockerlever housings. Install the six mounting screws intoeach housing. Tighten the screws in steps, followingthe pattern illustrated in Fig. 3. First tighten to 35 lb.-ft.(48 N m), then to 70 lb.-ft. (95 N m).3The feeler gage (Cummins P/N 3871534) has 0.023”feeler stock on both ends. One end can be used oncylinders 1, 3 and 5; the other end can be used forcylinders 2, 4 and 6 (see Figs. 5 and 6).26FIG. 5ROCKER ARM41EXHAUSTCROSSHEAD5SLAVE PISTONFEETFIG. 4FEELER GAGESlave PistonAdjustmentCYLINDERS 2, 4 & 6CYLINDERS 1, 3 & 5FIG. 63.On cylinders with the exhaust valves closed (crossheads loose), install one end of the feeler gage underboth feet of the slave piston. Turn the slave pistonadjusting screw (Robo-Lash ) clockwise until a slightdrag is felt on the feeler gage. Hold the adjustingscrew and tighten the locknut to 25 lb.-ft. (34 N m).4.Continue to adjust the remaining slave pistons wherethe exhaust valves are closed. Rotate the enginecrankshaft about 180 to adjust the remaining slavepistons.SLAVE PISTON ADJUSTMENT MUST BEMADE WITH THE FEELER GAGE POSITIONED UNDER BOTH FEET OF THE SLAVEPISTON. INCORRECT ADJUSTMENT CANCAUSE ENGINE DAMAGE.1.Adjust the slave piston clearance with the enginestopped and cold. Stabilized water temperature of140 F. (60 C.) or below. Exhaust valves, on thecylinder to be adjusted, must be in the closed position.CBRAKE BY JACOBS TUNE-UP KIT INSTRUCTIONS FOR CUMMINS N14 PLUS ENGINES4

Cummins Engine Company, Inc.Box 3005Columbus, IN 47202-3005U.S.A.CELECT is a trademark ofCummins Engine Company, Inc.Bulletin 3698836Printed in U.S.A. 12/97 1997 Cummins Engine Company, Inc.CBrake by Jacobs is a trademark ofCummins Engine Company, Inc. andJacobs Vehicle Systems, Inc.Jacobs P/N 020844C

cbrake by jacobs tune-up kit instructions for cummins n14 plus engines 3 wear safety glasses. the slave piston (14) is retained by springs (15, 16) that are under heavy compres-sion. if these instructions are not followed and proper tools not used, the spring could be d

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