CARBURETOR GP 2W1433 - Caterpillar

Installation Procedure
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g00563997
Put lube oil on the bridge dowels and the bore of each bridge (3). Install the bridges in the original locations. Loosen the adjusting screws.
Use the following procedure in order to adjust the bridges:
Put clean oil in the lubrication passage of the bridge.
Back out the adjusting screw. Press straight down on the top contact surface of bridge (3) with a force of 50 10 N (11 2 lb).
Turn the adjusting screw clockwise until the oil film in the lubrication passage of the bridge moves inward. This indicates that the adjusting screw has made contact with the valve stem.
Equalize the side clearance with the dowel by turning the adjusting screw clockwise.
Hold the adjusting screw in this position. Tighten the locknut to a torque of 100 15 N m (74 11 lb ft).
Do this procedure for both bridges. Put lube oil on the top contact of both bridges.
Illustration 2 g03890150
Put clean engine oil on each end of pushrods (4). Install the pushrods in the cam followers. Ensure that the pushrods are installed in the original locations.
Illustration 3 g03890159Note: Do not tighten the rocker arm shaft bolts until the rocker arm adjustment screws are loosened. Bent valves can result if the valves contact the pistons.
Place rocker arm assembly (2) on the rocker arm support.
Ensure that the sockets for the pushrods are engaged with the ball screws on the rocker arms.
Loosen the adjusting screws on the rocker arms.
Tighten bolts (5) that hold the rocker arm shaft to the rocker arm support.
Adjust the valve clearance. Refer to the Specifications Manual, SENR4257, "Valve Rocker Arms, Valve Lifters & Valve Bridges" for additional information. End By:
Install the valve covers. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Install".