3126B Petroleum Engine Caterpillar

Belt Tension Chart

Usage:

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Use of standard belts on this engine may cause an explosion which may result in personal injury or death. Only non-static belts should be used on this engine.

Note: Do not use the belt tension charts for belts with tensioners that are spring loaded.

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Table 1
Belt Tension Chart
Size of Belt	Width of Belt	Gauge Reading		Kent-Moore Gauge Numbers
		Belt Tension "Initial" ⁽¹⁾	Belt Tension "Used" ⁽²⁾ ⁽³⁾	Number of the Old Gauge	Number of the New Gauge
3/8	10.72 mm (0.422 inch)	534 ± 111 N (120 ± 25 lb)	400 ± 22 N (90 ± 5 lb)	BT-33-97	BT 3397
1/2	13.89 mm (0.547 Inch)	578 ± 111 N (130 ± 25 lb)	445 ± 44 N (100 ± 10 lb)	BT-33-97	BT 3397
5V	15.88 mm (0.626 Inch)	712 ± 111 N (160 ± 25 lb)	445 ± 44 N (100 ± 10 lb)	BT-33-72C	BT 3372C
11/16	17.48 mm (0.688 Inch)	712 ± 111 N (160 ± 25 lb)	445 ± 44 N (100 ± 10 lb)	BT-33-72C	BT 3372C
3/4	19.05 mm (0.750 Inch)	712 ± 111 N (160 ± 25 lb)	445 ± 44 N (100 ± 10 lb)	BT-33-72C	BT 3372C
15/16	23.83 mm (0.938 Inch)	712 ± 111 N (160 ± 25 lb)	445 ± 44 N (100 ± 10 lb)	BT-33-77	BT 3372C
8PK	27.82 mm (1.095 inch)	1068 ± 111 N (240 ± 25 lb)	890 ± 44 N (200 ± 10 lb)	BT-33-109	BT 33109
6PK	20.94 mm (0.824 Inch)	801 ± 111 N (180 ± 25 lb)	667 ± 44 N (150 ± 10 lb)	BT-33-109	BT 33109
Measure the tension of the belt that is farthest from the engine.

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^( 1 )	Belt tension "Initial" is for a new belt.
^( 2 )	Belt tension "Used" is for a belt that has operated for 30 minutes or more of operation at the rated speed.
^( 3 )	If a belt falls below the "Used" belt tension, the belt should be tightened again to the high side of the "Used" belt tension.

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Table 2
DAYCO Supplied Belts Only
Size of Belt	Belt Tension "Initial"	Belt Tension "Used" ⁽⁴⁾
0.380 (V-Belt)	623 ± 22 N (140 ± 5 lb)	245 - 534 N (100 ± 5 lb)
0.440 (V-Belt)	667 ± 22 N (150 ± 5 lb)	245 - 534 N (100 ± 5 lb)
0.500 (V-Belt)	712 ± 22 N (160 ± 5 lb)	245 - 534 N (100 ± 5 lb)
0.600 (V-Belt)	779 ± 22 N (175 ± 5 lb)	245 - 534 N (100 ± 5 lb)
0.660 (V-Belt)	890 ± 22 N (200 ± 5 lb)	245 - 534 N (100 ± 5 lb)
0.790 (V-Belt)	890 ± 22 N (200 ± 5 lb)	245 - 534 N (100 ± 5 lb)
4 - RIB PVK	623 ± 22 N (140 ± 5 lb)	267 - 445 N (90 ± 5 lb)
5 - RIB PVK	779 ± 22 N (175 ± 5 lb)	334 - 556 N (100 ± 5 lb)
6 - RIB PVK	934 ± 22 N (210 ± 5 lb)	400 - 667 N (130 ± 5 lb)
8 - RIB PVK	1157 ± 22 N (260 ± 5 lb)	534 - 890 N (180 ± 5 lb)
10 - RIB PVK	1557 ± 22 N (350 ± 5 lb)	667 - 1112 N (230 ± 5 lb)
12 - RIB PVK	1869 ± 22 N (420 ± 5 lb)	800 - 1335 N (270 ± 5 lb)
15 - RIB PVK	2336 ± 22 N (525 ± 5 lb)	1000 - 1669 N (350 ± 5 lb)