SUPPORT AS 2417905 - Caterpillar

start by:a) remove cylinder headb) remove precombustion chambers 1. Put compression on valve spring (2) with tool (A) and remove locks (1).2. Remove tool (A), spring, rotocoil and valve. Put identification on valves with respect to their locations in the cylinder head. 3. Check the spring force with tool (B). The spring force is 45.0 2.3 lb. (20.40 1.04 kg). The length of spring under test force is 1.738 in. (44.15 mm). The free length after test is 1.96 in. (49.8 mm).4. Do Steps 1 through 3 again for remainder of the valves.Install Valves
1. Put clean engine oil on valve stems. Install valve, rotocoil, spring in the cylinder head.2. Put compression on valve spring with tool (A). Use tool (B) to hold keepers in position until tool (A) is released.3. Remove tool (A) and hit the top of valve with a plastic hammer to be sure the locks are in their correct positions on valve stem.
Locks can be thrown from valve when compressor is released or when hit with a plastic hammer, if they are not in their correct positions on valve stem.
4. Do Steps 1 through 3 again for remainder of valves.end by:a) install precombustion chambersb) install cylinder head