ENGINE
TRUCK SERVICE MANUAL
screwdriver. Either will damage belts and cause early
Spin-On Element
failure
1. Close shut-off valves on inlet and drain lines.
2. Replace belts in complete sets. Belt riding depth
2. Unscrew element and discard.
should not vary over 1/16 inch [1. mm] on matched belt
3. Install new element, tighten until seal touches filter
sets.
head.
3. Pulley misalignment must not exceed 1/16 inch
Tighten an additional one-half to three-fourths turn. Fig.
[1.6mm] for each foot [0. m] of distance between pulley
2-24. Open shut-off valves.
centers.
4.
Belts should not bottom on pulley grooves nor
Caution: Mechanical tightening will distort or crack
should they protrude over 3/32 inch 12. mm] above top
filter
edge of groove.
5. Do not allow belts to rub any adjacent parts.
Fig. 2-24, (N12015). Installing DCA spin-on water filter
Fig. 2-27, (Ni1977) Checking belt tension
Check Engine Coolant
Belt Tension
Periodic tests of engine coolant should be made to
1.
Using appropriate gauge, Fig . 2-27, check
insure that the frequency of water filter servicing or
and/or adjust belts to tension as indicated in Table 2-2.
Table 2-2: Belt Tension (Pounds)
concentration of DCA inhibitor is adequate to control
corrosion for any specific condition of operation. In
Belt
New Belt
Reset
Belt
cases where "make-up' water must be added frequently,
Tension
we suggest that a supply of water be treated and added
Width
Installation Running After
Tension
as necessary.
(Inches)
Tension
Tension Run-In
Gauge
3/8
110
70 to 90 70
ST-1274
The concentration of effective inhibitors dissolved in
3/8
110
80 to 95 80
ST-968
coolant can be measured by Fleetguard DCA Coolant
1/2
110
80to100 80
ST-1274or
Checking Kit Part No. 3300846S or Cummins 3375208
ST-968
which is available from Cummins Distributors.
11/16
110
80to100 80
ST-1138
The test kit indicates DCA concentration by measuring
3/4
110
70 to
80
ST-1138
the total nitrite of a coolant sample, which provides
100
7/8
120
90to 110 90
ST-1138
1
130
100to
ST-1138
When antifreeze is present, it may contribute to the total
120 100
nitrite, but most of the nitrite protection is obtained from
15/32
120 to 140 70 to 90 70
ST-1274
the DCA inhibitor. In general, a good nitrite reading
or
indicates that the combined inhibitor packages contained
(FFC
ST-968
in the antifreeze (if used) and in DCA are sufficient to
Idler
insure complete cooling system protection.
Pulley)
Check And Adjust Belt Tension
Inline Engine Water Pump Belts (With Idler)
All driven assemblies must be secured in operating
position before reading or judging belt tension.
securing idler pulley to bracket or water pump (3, Fig. 2-
29).
1. Always shorten distance between pulley centers so
belt can be Installed without force. Never roll belt over
2. Using a pry bar (NTA) or adjusting screw (FFC
the pulley and never pry it on with a tool such as a
Series)adjust idler pulley until proper belt tension is
indicated on gauge See Table 2-2.
295