FOR MODELS: JGW, JGR AND JGJ SECTION 4 - LUBRICATION AND VENTING
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From the filter, oil travels to an oil gallery cast in the crankcase and running the length of the
crankcase.
Drilled holes from the gallery thru the bearing saddles deliver oil to the crankshaft bearings.
Passages drilled diagonally thru the crankshaft from the crank journals to the crank pins
deliver oil to the connecting rod bearings.
Holes drilled through the length of the connecting rods deliver oil to the connecting rod bush-
ing.
Oil travels from the bushings thru holes drilled in the middle of the crosshead pin to the hol-
low crosshead pins, and from there to the crosshead bushing.
Drilled passages from the oil gallery deliver oil at full system pressure thru the tubing to lubri-
cate the top and bottom of each crosshead. Run-off from the shoes, crosshead, and con-
necting rod bushings collects in the crosshead guide and drains back to the sump (see
Figure 4-10: Lube Oil System Schematic - Typical).
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