HYDRAULIC AR-PROPEL 2127101 - Caterpillar

Fuel Line And Rocker Arm Removal
1. Remove the fuel lines using the special Caterpillar fuel line wrench.
THE FUEL LINES AND NOZZLE ASSEMBLIES MUST BE PROTECTED FROM CONTAMINATION. FUEL LINE REMOVAL TAKES PLACE DOWN-STREAM FROM FINAL FILTRATION.
2. After removing the fuel lines, place them in the plastic bag found in the fuel line protective group. Install the protective caps on the nozzle assemblies. Push the plastic plugs into the open fuel lines.
COMPLETE ONE ENGINE BRAKE HOUSING INSTALLATION BEFORE STARTING THE INSTALLATION OF THE SECOND HOUSING. THE PRACTICE OF REMOVING SIX ROCKER ARM HEAD BOLTS AT ONE TIME CAN INTERFERE WITH THE PROPER SEATING OF THE ENGINE HEAD.
3. Loosen the rocker arm adjusting screw locknuts. Remove the rocker arm bolts. Save the washers for use later. 4. Remove the entire rocker arm group. (3 cyl.) 5. Remove the exhaust valve bridges from the engine. 6. Remove the exhaust valve bridge leveling screws and jam nuts from the Caterpillar exhaust valve bridges. 7. Loosely install the Caterpillar exhaust valve bridge leveling screws and nuts into the Jacobs bridges.Bridge Adjustment
1. Put some clean engine lube oil into the bridge bore. Install the Jacobs Exhaust Valve Bridges on the engine and level them as follows: a. Back off adjusting screw several turns making sure it is not in contact with the valve stem.b. Press firmly and straight down on the top of the bridge.c. Turn the adjusting screw clockwise until contact is made with the valve stem, then turn the adjusting screw an additional 20 to 30 degrees (1/2 flat of locknut).d. Hold the adjusting screw in this position and tighten the locknut to 24 lbft (32N m).e. Put some clean engine lube oil on the area where the rocker arm contacts the bridge. THE INTAKE VALVE BRIDGES MUST ALSO BE ADJUSTED AT THIS TIME USING SAME PROCEDURE.Exhaust Rocker Adjusting Screw Exchange
1. Remove the slotted head Caterpillar exhaust rocker adjusting screws. Note the difference between the Caterpillar and Jacobs Rocker Adjusting Screws.
THE LARGE HEADED C-346B SCREWS CAN BE USED WITH C-346A AND C-346 HOUSINGS. IF C-346B SCREWS ARE USED ON C-346A AND C-346 HOUSINGS, MODEL C-346B MASTER PISTON RETURN SPRINGS MUST ALSO BE USED. SEE PARTS MANUAL FOR PART NUMBERS.
2. Install the Jacobs rocker adjusting screws in the exhaust rocker levers. Reuse the Caterpillar lock nuts. Discard Caterpillar adjusting screws after substitution.Extraction Of Dowel Pin
1. Identify the front (fan end) of the rocker arm groups. Tightly clamp the Jacobs special Dowel Pin Extractor or similar tool on the front locating pin of the rocker group. Pin must be extracted at cylinder No. 1 location. Be sure to do the same at the No. 4 location later on. Carefully extract the dowel pin by tightening the two cap-screws in small equal increments (1/4 turn each). 2. Lubricate the end of the Jacobs oil supply adapter with clean engine oil and install in place of the Caterpillar dowel pin. The pin holes in the pedestal and the rocker arm shaft must align. Do not install