LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2021 >> Explorer ST >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine - 3.0L ECOBOOST >> Specifications >> Piston and Connecting Rod
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Piston and Connecting Rod

Item Specification
Piston diameter - single grade 3.3601 -3.3606 in (85.346 -85.36 mm)
Piston-to-cylinder bore clearance 0.0016 -0.0028 in (.04 -.072 mm)
Piston ring end gap - compression (top, gauge diameter) 0.0091 -0.0130 in (.23 -.33 mm)
Piston ring end gap - compression (bottom, gauge diameter) 0.0157 -0.0236 in (.4 -.6 mm)
Piston ring end gap -- oil ring (steel rail, gauge diameter) 0.0079 -0.0197 in (.2 -.5 mm)
Piston ring groove width - compression (top) 0.0484 -0.0492 in (1.23 -1.25 mm)
Piston ring groove width -- compression (bottom) 0.0402 -0.0409 in (1.02 -1.04 mm)
Piston ring groove width - oil ring 0.0799 -0.0807 in (2.03 -2.05 mm)
Piston ring width - upper compression ring 0.0461 -0.0469 in (1.17 -1.19 mm)
Piston ring width - lower compression ring 0.0382 -0.0390 in (.97 -.99 mm)
Piston ring-to-groove clearance (upper and lower compression rings) 0.0016 -0.0031 in (.04 -.08 mm)
Piston pin bore diameter 0.8663 -0.8665 in (22.004 -22.009 mm)
Piston pin diameter 0.8660 -0.8661 in (21.997 -22 mm)
Piston pin length 2.0177 -2.0295 in (51.25 -51.55 mm)
Piston pin-to-piston fit 0.0002 -0.0005 in (.004 -.012 mm)
Piston-to-connecting rod clearance 0.1181 in (3 mm)
Connecting rod-to-pin clearance - standard 0.0007 -0.0012 in (.017 -.03 mm)
Connecting rod pin bore diameter 0.8668 -0.8668 in (22.017 -22.017 mm)
Connecting rod length (center-to-center) 5.6677 -5.6709 in (143.96 -144.04 mm)
Connecting rod maximum allowed bend 0.0008 in (.02 mm)
Connecting rod maximum allowed twist 0.0016 in (.04 mm)
Connecting rod bearing bore diameter 2.3397 -2.3402 in (59.428 -59.442 mm)
Connecting rod bearing-to-crankshaft clearance 0.0017 -0.0035 in (.042 -.088 mm)
Connecting rod side clearance (assembled to crank) - standard 0.0049 -0.0148 in (.125 -.375 mm)
Connecting rod side clearance (assembled to crank) - service limit 0.0049 -0.0148 in (.125 -.375 mm)