879716 Mercruiser BRACKET-ALTERNATOR

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.
(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.
Table 2
DAYCO Supplied Belts Only
Size of Belt Belt Tension
“Initial” Belt Tension
“Used”(1)
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)
(1) If a belt falls below the “Used” belt tension, the belt should be tightened again to the “Init