Engine Block: Pistons: Installation

Before installing the pistons, apply a coat of engine oil to the ring grooves and cylinder bores.

1. If the crankshaft is already installed:
   • Set the crankshaft to BDC for each cylinder.
   • Remove the connecting rod caps, and slip short sections of rubber hose over the threaded ends of the connecting rod bolts.
   • Install the ring compressor, check that the bearing is securely in place, then position the piston in the cylinder, and tap it in using the wooden handle of a hammer.
   • Stop after the ring compressor pops free, and check the connecting rod-to-crank journal alignment before pushing the piston into place.
   • Install the rod caps with bearings, and torque the nuts to:

     31 N.m (3.2 kgf.m, 23 lbf.ft) 

     Apply engine oil to the bolt threads.

2. If the crankshaft is not installed:
   • Remove the rod caps and bearings, install the ring compressor, then position the piston in the cylinder and tap it in using the wooden handle of a hammer.
   • Position all pistons at top dead center.
     Fig 1: Positioning Pistons Top Dead Center

     Courtesy of AMERICAN HONDA MOTOR CO., INC.
     NOTE: Maintain downward force on the ring compressor to prevent the rings from expanding before they enter the cylinder bore.
     Fig 2: Installing Piston

     Courtesy of AMERICAN HONDA MOTOR CO., INC.