Rotate the crankshaft until the pistons are below the carbon deposits that are found above the ring travel area. Use a fine fibrous abrasive pad, Part Number 3823258 or equivalent, and solvent to remove the carbon. Mark each piston according to the cylinder location. NOTE: On pistons with anodized coatings, do not stamp on the… Read More »
NOTE: Align the vibration damper/crankshaft speed indicator ring assembly with the index pin located on the nose of the crankshaft. Lubricate the capscrews with clean engine oil. Install the vibration damper/crankshaft speed indicator ring assembly. For front gear train engines, tighten the four damper capscrews in a criss-cross pattern. For rear gear train engines, tighten… Read More »
Use soapy water to clean any oil from the vibration damper/crankshaft speed indicator ring assembly. Dry the vibration damper/crankshaft speed indicator ring assembly with compressed air. Inspect the crankshaft speed indicator ring for missing teeth, cracks, or damaged surfaces. If any damage is found, the entire vibration damper/crankshaft speed indicator ring assembly must be replaced.… Read More »
For front gear train engines, remove the four capscrews. For rear gear train engines, remove the six capscrews. NOTE: The crankshaft speed indicator ring is part of the vibration damper assembly and must not be removed from the vibration damper. Remove the vibration damper/crankshaft speed indicator ring assembly.
Inspect the piston rings for the following: • Abrasive wear. NOTE: Abrasive wear of the intermediate ring can be indicated by a rapid reduction of the finish coating on the front face of the ring (A). This is commonly referred to as full face ring wear. This rapid reduction will typically leave a sharp edge… Read More »
J-Jet Piston Cooling Nozzle Install the piston cooling nozzle one cylinder at a time rotating the crankshaft as necessary for access. Use a long extension to guide the capscrew and/or piston cooling nozzle into place. NOTE: The locator pin on the J-jet piston cooling nozzle must engage the locating hole in the block for proper… Read More »
Clean the J-jet piston cooling nozzle and oil passage in the block using solvent. Dry with compressed air. Inspect the capscrew and J-jet piston cooling nozzle for damage.
J-Jet Piston Cooling Nozzle Rotate the crankshaft to various positions to access each piston cooling nozzle. Remove the piston cooling nozzles.
J-jet piston cooling nozzles are located between the main bearing saddles on the exhaust side of the engine. Oil is supplied from an oil gallery in the block on the exhaust side of the engine.
NOTE: To ensure accuracy, the following measurements must be completed with the components at room temperature, 20°C [68°F] Measure the piston skirt diameter 21.4 mm [0.84 in] (A) from the bottom of the piston. Measure the piston ring clearance. Use a new piston ring to measure the clearance in the ring groove. NOTE: The top… Read More »