LOCK 9M0909 - Caterpillar

EngineCG137-08 (S/N: WWF1-UP; FPL1-UP)CG137-12 (S/N: SC21-UP; FYR1-UP; WRX1-UP)G3406 (S/N: 4FD1-UP; R7E1-UP; 1RK1-UP; KAR1-UP)G3408 (S/N: 6NB1-UP; 6RJ1-UP)G3408C (S/N: BAZ1-UP)G3412 (S/N: R7A1-UP; 7DB1-UP; KAP1-UP)G3412C (S/N: 6ZM1-UP)Description Of Change: Unlike the previously used adjustable valve bridge, the floating valve bridge does not rest on a dowel. Also, the floating valve bridge does not require any adjustment.Adaptable To: The new cylinder head groups have longer valves to accommodate the floating valve bridge. The dowels have been removed from the cylinder heads.The 6I-2077 Valve Mechanism Gp has been updated to include the 100-6889 Valve Bridge.The new and former cylinder head groups are listed in Table 1.
Table 1
Sales Model New Part Number Part Description Former Part Number
G3406 364-3477 Cylinder Head Gp 327-6910
CG137-08, G3408 466-7755 Cylinder Head Gp 300-5525
CG137-12, G3412 467-7546 Cylinder Head Gp 206-7745
Illustration 1 g03064345
(1) 100-6889 Valve Bridge
(2) 101-1816 Valve Bridge As (INLET) or 101-1818 Exhaust Bridge AsThe differences in the cylinder head groups and valve mechanism group are listed in Tables 2 and 3.
Table 2
Differences in the Cylinder Head Groups
New Cylinder Heads Former Cylinder Heads
358-1229 Inlet Valve 212-0932 Inlet Valve
358-1230 Exhaust Valve 212-0933 Exhaust Valve
N/A 2N-5775 Dowel
Table 3
Differences in the 6I-2077 Valve Mechanism Gp
Latest Version Previous Version
100-6889 Valve Bridge 101-1816 Valve Bridge As (INLET)
101-1818 Exhaust Bridge As
Illustration 2 g03064936
6I-2077 Valve Mechanism Gp and 364-3477 Cylinder Head Gp
The 206-7745 Cylinder Head Gp, the 300-5525 Cylinder Head Gp, and the 327-6910 Cylinder Head Gp can be modified for the floating bridge or for servicing an existing valve mechanism. Refer to the engine Disassembly and Assembly manual for details on servicing the cylinder head.Remove the valve bridges and remove the 2N-5775 Dowels.Remove the 212-0932 Inlet Valves and the 212-0933 Exhaust Valves.Install the 358-1229 Inlet Valves and the 358-1230 Exhaust Valve.Install the 100-6889 Valve Bridges.
Illustration 3 g01097665
Typical example of the slotted pocket in the floating valve bridge
When viewing the bottom of the new valve bridges the valve bridge have a pocket on either end for each tip of the valve stem. One of the pockets is round and the other pocket is slotted. The bridge must be placed on the cylinder head so that the slotted pocket is toward the inside of the engine. Refer to Illustration 4.
Illustration 4 g06227142
Orientation of the slotted valve bridge pocket should face towards rocker shaft.
(1) Slotted pocket
(2) Inside of the engine