TM 5-3895-383-24
BELT TENSION CHART
GAUGE READING
BORROUGHS GAUGE NUMBERS
WIDTH
BELT TOP
BELT TENSION “INITIAL”
*
BELT TENSION “USED” **
BELT
SIZE
MM
IN
N
LB
N
LB
OLD
GAUGE
NUMBER
NEW
GAUGE
NUMBER
3/8
10.72
0.422
445 ± 22
100 ± 5
400 ± 22
90 ± 5
BT-33-95
BT-33-97
1/2
13.89
0.547
534 ± 22
120 ± 5
400 ± 44
90 ± 10
BT-33-95
BT-33-97
5V
15.88
0.626
534 ± 22
120 ± 5
400 ± 44
90 ± 10
BT-33-72
BT-33-72C
11/16
17.48
0.688
534 ± 22
120 ± 5
400 ± 44
90 ± 10
BT-33-72
BT-33-72C
3/4
19.05
0.750
534 ± 22
120 ± 5
400 ± 44
90 ± 10
BT-33-72
BT-33-72C
15/16
23.83
0.983
534 ± 22
120 ± 5
400 ± 44
90 ± 10
BT-33-72
BT-33-77
8K
27.92
1.099
800 ± 22
180 ± 5
489 ± 44
110 ± 10
- - - - - - - -
BT-33-109
6PK
20.94
0.824
667 ± 22
150 ± 5
467 ± 44
105 ± 10
- - - - - - - -
BT-33-109
MEASURE TENSION OF BELT FARTHEST FROM ENGINE
*
BELT TENSION "INITIAL" is for a new belt.
**
BELT TENSION "USED" is for a belt with over
30 minutes of operation at rated speed.
D01599
Basic Block
Connecting Rod Bearings
The connection rod bearings fit tightly in the bore in the rod. If
bearing joints or backs are worn (fretted), check bore size.
This can be an indication of wear because of a loose fit.
Connecting rod bearings are available with 0.25 mm (.010 in)
and 0.50 mm (.020 in) smaller inside diameter than the original
size bearings. These bearings are for crankshafts that have
been ground (made smaller than original size).
Main Bearings
Main bearings are available with a larger outside diameter than
the original size bearings. These bearings are for cylinder
blocks that have had the bore for the main bearings "bored"
(made larger than the original size). The size available is 0.50
mm (.020 in) larger outside diameter than the original size
bearings.
Main bearings are available with a smaller inside diameter than
the original size bearings. These bearings are for cylinder
blocks that have a crankshaft that has been ground (made
smaller than original size). Main bearings are available with
0.25 mm (.010 in) and 0.50 mm (.020 in) smaller inside
diameter than the original size bearings.
Cylinder Block
The bore in the block for main bearings can be checked with
the main bearing caps installed without bearings. Tighten the
nuts that hold the caps to the torque shown in the
Specifications section. Alignment error in the bores must not
be more than 0.08 mm (.003 in).
The 1P3537 Dial Bore Gauge Group can be used to check the
size of the bore. Special Instruction, GMG00981 is with the
group.
1P3537 Dial Bore Gauge Group
6-88
