EDGE-CUTTING 6Y0476 - Caterpillar

Engine: G3520B (S/N: BGW1-UP; GET1-UP; GLF1-UP; TPC1-UP)Generator Set: G3520B (S/N: CWD1-UP; GZP1-UP) G3520C (S/N: GZA1-UP; GZB1-UP; MAD1-UP; GZJ1-UP; GZK1-UP; GZL1-UP; GZM1-UP; GZN1-UP; B9P1-UP; RLP1-UP; LGS1-UP; HAT1-UP; CWW1-UP; CWY1-UP) G3520E (S/N: GZG1-UP; GZH1-UP; HAL1-UP; SXY1-UP)Introduction
Do not perform any procedure in this Special Instruction until you read this information and you understand this information.This Special Instruction provides information for plugging the oil supply hole and the oil return hole on the 315-1391 Crankshaft .
The 315-1391 Crankshaft may require additional plugs for preventing an oil leak. Failure to ensure that the additional plugs are installed could result in an oil leak that can lead to severe damage to the engine. Before you install the crankshaft and the crankshaft vibration damper, verify the need for additional plugs.
Plug the Oil Supply Hole and the Oil Return Hole
The 315-1391 Crankshaft includes a hole for the engine oil supply and a hole for the oil return. The holes are drilled into the front of the crankshaft in order to supply engine oil to the damper only when the 319-8494 Damper Gp is used.Do not install the plugs when the 319-8494 Damper Gp is used.For the dampers that are listed in Table 1, the oil supply hole and the oil return hole must be plugged or a significant oil leak will occur.The oil supply hole and the oil return hole must be plugged with two 323-3617 O-Ring Plugs and two 3J-7354 O-Ring Seals .Make sure that you install the plugs when a damper that is listed in Table 1 is used.
Table 1
The 315-1391 Crankshaft Must be Plugged if the Dampers in this Table are Used.    
Damper Gp Part Number     Damper Part Number    
125-9749     171-4571    
8N-7182     193-3288    
227-9523     171-4571    
162-7460     171-4571    
4W-0278     7W-3193
193-3288    
8N-0339     146-3740    
240-7762     244-4508    
305-3760     244-4508    
309-6850     171-4571    
Illustration 1 g01640423
(1) Oil return hole (2) Oil supply hole (3) 323-3617 O-Ring Plug (4) 3J-7354 O-Ring Seal Torque for the plug ... 12 2 N m (105 17 lb in)