Cummins 4BT – Piston and Connecting Rod – Assembly

Be sure “ fro nt” marking on piston and the numbers on the connecting rod and cap are oriented as illustrated.

Install the retaining ring in the pin groove on the ‘front” side of the piston.

Lubricate the pin and pin bores with engine lubricating oil.

Install the pin.
Pistons do not require heating to install the pin, how­ever, the pistons do need to be at room temperature or above.

Install the second retaining ring.