BobCat 753 – RECONDITIONING THE ENGINE – Piston And Connecting Rod Removal And Installation

Remove the cylinder head. (See Cylinder Head Removal And Installation on Page 70-100-1.)

Remove the top edge from the cylinder bore with a ridge reamer.

Remove the oil pin.

Remove the oil pump strainer (Item 1) [Figure 70-100-53].

Turn the flywheel and put a pair of connecting rods at bottom dead center.

Remove the connecting rod bolts.

Installation: Tighten the connecting rod bolts to the following torque.

Remove the rod cap and bearing [Figure 70-100-54].

Use a hammer handle and push the piston/connecting rod assembly out of the cylinder bore [Figure 70-100-54].

NOTE: Make sure the pistons are marked so they will be returned to the same cylinder bore.

Installation: When inserting the piston into the cylinder, face the mark on the connecting rod to the injection pump [Figure 70-100-55].

Repeat the procedure to remove the other piston/connecting rod assemblies from the engine block.

Remove the piston rings [Figure 70-100-56].

Remove the snap ring (Item 3) and piston pin (Item 1) [Figure 70-100-56].

Separate the piston (Item 2) from the connecting rod (Item 4) [Figure 70-100-56].

Installation: When installing new rings, assemble the ring so the mark (Item 1) near the gap faces the top of the piston. When installing the oil ring, place the expander joint (Item 2) on the opposite side of the oil ring gap (Item 3) [Figure 70-100-57].

Installation: When reassembling, align the marks (Item 1) on the connecting rod and piston (Item 2). Heat the piston to 176-212°F (80-100°C.) and tap the piston pin into position. Place the piston rings so that there are gaps every 120 degrees (Items 3, 4 & 5) [Figure 70-100-58] with no gap facing the piston pin in the cylinder.



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