BOSS GP-LIFT ARM 3844169 - Caterpillar

Start By:a. remove cylinder head assembliesb. remove fuel injection nozzles and adapters. 1. Put springs (1) in compression with Tool (A).2. Remove locks from valves3. Remove Tool (A) the rotocoil spring and valve. If valves can be used again, put identification marks on the valves for correct location at installation. 4. Check the spring force with Tool (B). The spring force must be 344 34 N (77.5 7.6 lb) when the length of spring under force is 54.99 mm (2.165 in).5. Do Steps 1 through 4 again for the remainder of the valves.Install valves
1. Put clean engine oil on the valve stem. Install spring (2), rotocoil (1) and the valve. 2. Put the springs in compression with Tool (A).3. Install locks (3) with the thick end up.
Locks can be thrown from the valve when the spring compressor is released if the locks are not in their correct position.
4. Remove the compressor, and hit the valve with a soft hammer to be sure the locks are in their correct position.5. Do Steps 1 through 4 again for the remainder of the valves.End By:a. install fuel injection nozzles and adaptersb. install cylinder head assemblies