International 1000B Engine >> REVISED PISTON ASSEMBLY FOR 7.3L DIESEL ENGINES

International 1000B Engine >> REVISED PISTON ASSEMBLY FOR 7.3L DIESEL ENGINES

Revised Piston and Ring Assembly On
Navistar 7.3L Diesel Engines

Navistar International has revised the piston and ring assembly for their 7.3L engines used in Ford light and medium duty trucks among others. The new pistons and rings are used in all engines manufactured as of serial number 598754. Prior engines use the former designs. The new assembly may be used in sets to update older engines when they are being remanufactured.

The revised piston features a taller top ring and oil control ring groove to accommodate the new plasma ring set. Since the former design rings will fit into the new piston, a mix-up is possible. However, loss of oil control and poor engine performance may result.

Revised Design

Bore Piston & Ring Ring Set Stamped No. on
Size Assembly Part # Part # Piston

STD 1 813 167 C91 1 813 171 C91 1 813 154 C1
.010 1 813 168 C91 1 813 172 C91 1 813 155 C1
.020 1 813 169 C91 1 813 173 C91 1 813 156 C1
.030 1 813 170 C91 1 813 174 C91 1 813 157 C1

Former Design

Bore Piston & Ring Ring Set Stamped No. on
Size Assembly Part # Part # Piston

STD 1 809 140 C91 1 809 146 C91 1 809 107 C2
.010 1 809 141 C91 1 809 147 C91 1 809 108 C2
.020 1 809 142 C91 1 809 148 C91 1 809 109 C1
.030 1 809 143 C91 1 809 149 C91 1 809 110 C1

At present there are no aftermarket sources available for either the former and revised piston or ring set. Furthermore, pistons are only available as an assembly that includes the wrist pin, lock rings and piston rings. Piston ring sets are serviced separately.

The AERA Technical Committee

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