Engine Overhaul Specifications

Torque figures, clearances and bore diameters for the engine families we supply parts for — the numbers you need before you open the engine. Compiled from our supplier’s service data.

Komatsu engines — 95 / 102 / 107 / 114 / 125 PC60 → PC400

Specification	95PC60 / PC100 / PC130	102PC200-6 / PC200-7	107PC200-8 / PC210-8 / PC240-8	114PC300-7 / PC360-7	125PC400-5 / -6 / -7 / -8
Application
Applicable machines	PC60/100/130	PC200-6/-7	PC200/210/240-8	PC300/360-7	PC400-5/6/7/8
Torque
Cylinder head bolts Nm + °	78 + 117 + 90°	90 + 120 + 90°	90 + 90 + 90°	70 + 145 + 90°	98 + 127 + 90°
Connecting rod bolts Nm + °	39.2 + 90°	30 + 60 + 60°	60 + 60°	40 + 80 + 120°	100 + 90°
Main bearing cap bolts Nm + °	60 + 90 + 90°	60 + 90 + 90°	60 + 80 + 90°	50 + 120 + 176 + 90°	100 + 200 + 90°
Valve clearance
Intake valve clearance mm	0.35 ± 0.08	0.25	0.25	0.30	0.33
Exhaust valve clearance mm	0.50 ± 0.08	0.51	0.51	0.61	0.71
Piston ring end gap
Top ring end gap mm	0.30–0.45	0.35–0.45	0.33–0.43	0.35–0.60	0.37–0.57
Second ring end gap mm	0.30–0.45	0.25–0.55	0.55–0.85	0.35–0.65	0.50–0.70
Oil ring end gap mm	0.25–0.45	0.25–0.55	0.25–0.50	0.30–0.60	0.28–0.48
Bearing clearance
Connecting rod bearing clearance mm	0.029–0.089	0.05–0.114	0.04–0.120	0.033–0.117	0.046–0.090
Main bearing clearance mm	0.029–0.089	0.05–0.119	0.04–0.120	0.050–0.128	0.062–0.106
Dimensions
Connecting rod journal OD mm	57.00	68.962–69.013	68.962–69.013	75.962 *	79.990–80.020
Main journal OD mm	70.00	82.962–83.013	82.962–83.013	97.962–98.031	109.990–110.010
Block bearing bore mm	74.000–74.019	87.982–88.018	87.982–88.008	104.982–105.018	115.990–116.010
Connecting rod big-end bore mm	61.00–61.025	72.987–73.013	72.99–73.01	80.987–81.013	84.996–85.022
Piston diameter mm	94.940–94.955	101.823–101.887	106.87–106.92	113.814–113.886	124.895–124.910
Cylinder liner bore mm	95.00	102.000–102.116	106.990–107.010	114.000–114.040	125.00–125.02

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Caterpillar engines — 3066 / C6.4 320B → 323D

Specification	3066320B / 320C / 320D	C6.4320D / 323D
Application
Applicable machines	320B/320C/320D	320D/323D
Torque
Cylinder head bolts N·m + °	118 ±5 + 90°	137 ±5 + 90°
Connecting rod bolts N·m + °	103 ±5 + 90°	103 ±5 + 90°
Main bearing cap bolts N·m + °	137 ±5 + 90°	137 ±5 + 90°
Valve clearance
Intake valve clearance mm	0.25	0.25
Exhaust valve clearance mm	0.25	0.40
Piston ring end gap
Top ring end gap mm	0.30–0.45	0.30–0.45
Second ring end gap mm	0.30–0.45	0.30–0.45
Oil ring end gap mm	0.30–0.50	0.30–0.50
Bearing clearance
Connecting rod bearing clearance mm	0.035–0.100 (limit 0.20)	0.035–0.100 (limit 0.20)
Main bearing clearance mm	0.035–0.100 (limit 0.20)	0.050–0.118
Dimensions
Connecting rod journal OD mm	64.945–64.965	64.945–64.965
Main journal OD mm	89.95–89.97	89.95–89.97
Block bearing bore mm	95.000–95.022	to confirm
Connecting rod big-end bore mm	to confirm	69.000–69.019
Piston diameter mm	101.915–101.945	101.915–101.945
Cylinder liner bore mm	102.010–102.045 (limit 102.200)	102.010–102.045

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Caterpillar engines — C7 / C9 / C13 324D → 349D

The source catalogue prints this table without row labels. Row order follows the same layout as the 3066 / C6.4 table opposite it.

Specification	C7324D / 325D / 329D	C9330D / 336D / 340D	C13345C / 345D / 349D
Application
Applicable machines	324D/325D/329D	330D/336D/340D	345C/345D/349D
Torque
Cylinder head bolts N·m + °	130 ±15 + 90°	130 ±15 + 90°	170 ±10 + 120°
Connecting rod bolts N·m + °	70 ±5 + 90°	50 ±5 + 90°	130 ±7 + 60°
Main bearing cap bolts N·m + °	54 ±7 + 90°	95 ±5 + 90°	95 ±5 + 90°
Valve clearance
Intake valve clearance mm	0.38 ± 0.08	0.38 ± 0.08	0.38 ± 0.08
Exhaust valve clearance mm	0.64 ± 0.08	0.64 ± 0.08	0.64 ± 0.08
Piston ring end gap
Top ring end gap mm	0.40 ± 0.10	0.40 ± 0.10	0.40 ± 0.10
Second ring end gap mm	1.20 ± 0.125	1.50 ± 0.125	1.00 ± 0.125
Oil ring end gap mm	0.45 ± 0.15	0.45 ± 0.15	0.45 ± 0.15
Bearing clearance
Connecting rod bearing clearance mm	0.053–0.155	0.053–0.155	0.062–0.132
Main bearing clearance mm	0.071–0.173	0.071–0.173	0.081–0.181
Dimensions
Connecting rod journal OD mm	70.000 ± 0.020	80.000 ± 0.020	89.000 ± 0.020
Main journal OD mm	90.000 ± 0.020	104.000 ± 0.020	108.000 ± 0.020
Block bearing bore mm	95.000 ± 0.013	112.000 ± 0.013	116.000 ± 0.013
Connecting rod big-end bore mm	75.000 ± 0.013	85.000 ± 0.013	93.800 ± 0.013
Piston diameter mm	not printed	not printed	not printed
Cylinder liner bore mm	110.025 ± 0.025	112.025 ± 0.025	130.025 ± 0.025

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Torque figures are for original bolts — check whether your bolts are torque-to-yield before reuse. Values marked “to confirm” come from a source page where the figure is inconsistent; we check with the supplier before you machine anything. Always confirm critical dimensions with us before cutting.

We supply complete overhaul kits (pistons, liners, rings, bearings, gaskets) and individual parts by OEM number for every engine listed here. Send your engine code or a nameplate photo for a 24-hour quote.

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