TRUCK SERVICE MANUAL
screwdriver. Either will damage belts and cause early
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
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.
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
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
Periodic tests of engine coolant should be made to
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
cases where "make-up' water must be added frequently,
we suggest that a supply of water be treated and added
Installation Running After
70 to 90 70
The concentration of effective inhibitors dissolved in
80 to 95 80
coolant can be measured by Fleetguard DCA Coolant
Checking Kit Part No. 3300846S or Cummins 3375208
which is available from Cummins Distributors.
The test kit indicates DCA concentration by measuring
the total nitrite of a coolant sample, which provides
90to 110 90
When antifreeze is present, it may contribute to the total
nitrite, but most of the nitrite protection is obtained from
120 to 140 70 to 90 70
the DCA inhibitor. In general, a good nitrite reading
indicates that the combined inhibitor packages contained
in the antifreeze (if used) and in DCA are sufficient to
insure complete cooling system protection.
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-
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.