GASKET 7E4342 - Caterpillar

Remove Jacobs Engine Brake
Start By:a. remove valve covers 1. Disconnect solenoid lead wires (1) and (3) from the terminal in the Jacobs spacer.2. Remove eight Jacobs nuts (2) and four Jacobs bolts that hold the Jacobs spacers to the valve cover bases. Remove Jacobs spacers (4). Do Steps 3 through 10 for each end of the engine. The front half of the engine is shown.3. Remove four Jacobs studs (5) and Jacobs washers. Remove three bolts (6) and remove valve cover base (7). 4. Remove Jacobs nuts (8), Jacobs washers, Jacobs bolts (9), and the Jacobs washers that hold the Jacobs brake housing assembly in place.5. Remove Jacobs brake housing assembly (10). The Jacobs brake for the 3406B Truck Engine has only one support bracket (11).6. Remove Jacobs head bolts (12), and remove Jacobs support brackets (11) from the cylinder head. 7. Remove inner fuel lines (13). 8. Remove Jacobs washers (14) and Jacobs shims (15) from the Jacobs stud assemblies. 9. Remove bolt (17) and two Jacob stud assemblies (16) that hold the rocker shaft assembly to the head. Remove rocker shaft assembly (18). 10. Remove Jacobs exhaust valve bridges (20) from the exhaust valves only. The intake valves have the Caterpillar intake valve bridges. Remove the Caterpillar intake valve bridges (19).Install Jacobs Engine Brake
Do each step for each end of the engine. The front half is shown.1. Put clean engine oil on the bridges and dowels.2. Install Jacobs exhaust valve bridges (20) and the Caterpillar intake valve bridges (19) on the dowels.3. Keep hand pressure on the bridges, and turn the adjustment screw clockwise until contact is made with the valve stem. Turn the screw an extra 20° to 30°. This will make the dowel straight in the guide and compensate for gap (slack) in the threads. Hold the adjustment screw in this position, and tighten the locknut to