Usage:
The following leveling (shimming) procedure is required on 3406B engines with serial numbers lower than 7FB39279 and all 92U prefix engines.
1. Install Jacobs mounting washers marked "A" on studs.
2. Before placing brake units on engine, loosen and backout the slave piston adjusting screw until slave piston is seated in its bore.
3. Carefully install the brake housing. Pay particular attention to the oil supply adapter to ensure proper alignment.
4. Install the Jacobs 3/8" capscrew and the washer through the housing and into the support bracket. Adjust bracket location as needed. Do NOT install large Jacobs nut on Jacobs stud at this time. Jacobs 3/8" capscrew should be tightened to only 10 lbft (13N·m).
Torque the support bracket bolt to 200 lbft (270N·m). Retorque to 330 lbft (450N·m). Always repeat torquing of bolts and studs as a check.
5. With the front and rear housings now on the engine, a gap should exist between the bottom of the brake housing and the top of the Jacobs washer at the four stud locations. Measure the gap with a feeler gauge at all four locations and record the measurements.
6. Remove the 3/8" capscrew and remove the engine brake housings from the engine.
7. Measure the thickness of the Jacobs shim packs. These are laminated shims; each shim measures 0.003 in. (0.08mm).
8. Using a knife and micrometer, separate and remeasure the shim packs. These shim packs must be within 0.003 in. (0.08mm) of the gap under the housing previously measured. Repeat this procedure for all stud locations.
| NOTICE |
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STACK WASHERS AND SHIM PACKS AS INSTRUCTED. CORRECT STACK-UP IS IMPORTANT. IF IMPROPERLY STACKED, THE SHIM PACK COULD BE DAMAGED BY RECESS CUT IN THE HOUSING BOTTOM. |
9. Remove the Jacobs washers and place the measured shim packs on the Jacobs studs. Place the Jacobs washers previously removed on top of the shim packs. Note that the washer is larger in diameter than the shim pack, and that a recess is cut in bottom of housing.
Now install the fuel lines as shown on page 13.
10. Install "O" ring on oil supply adapter. Place a small amount of grease on the adapter.
11. Reinstall the housing again being careful about the oil supply adapter and its "O" ring. Make sure that fuel lines clear housing by 0.125 in. min. (3.175mm).
12. Place Jacobs washers, marked "A" and holddown nuts on the Jacobs studs.
13. Reinstall the Jacobs 3/8" cap screws and washers.
Torque the Jacobs holddown nuts to 60 lbft (81.6N·m).
Retorque 3/8" cap screws to 47 lbft (64N·m) and the Jacobs holddown nuts to 100 lbft (135N·m). Repeat the last procedure to secure the brake housing.
Reinspect each fuel line location to ensure that there is no contact between brake components and the fuel lines.
Reset fuel lines if necessary.
NOW REPEAT THE ALTERNATE HOUSING LEVELING PROCEDURES AND INSTALL THE ENGINE BRAKE ON THE OTHER 3 CYLINDERS AND PROCEED WITH VALVE AND SLAVE PISTON ADJUSTMENTS SHOWN ON PAGE 14.