User Manual

HOW-TO SECTION
Coolant Maintenance
Intervals — Check the nitrite
concentration at the regular intervals
listed in Table 26 with a Power Trac
3–Way Test Str ip. Nitrite levels must
be within the ranges listed in Table
22. Additional SCA must be added to
the coolant when it becomes depleted,
as indicated by a nitrite concentration
of 900 PPM or less. If th e nitrite
concentration is greater than 900
PPM, do not add additional SCA.If
the nitrite concentration is above 3200
PPM, the system is over-inhibited and
should be partially drained and filled
with a 50/50 mix of water and EG or
PG.
In this case the EG or PG should
contain no inhibito rs and should
conform to ASTM D4985. This
will dilute the over-concentrated
inhibitors.
NOTE:
In non-OAT systems, nitrite
concentration of 5000 PPM or
higher on a Series 50 engine
suggests problem atic additive
over-concentration. This condition
must be corrected by immediate
draining and flushing of the cooling
system. Refill the system with new fully
formulated or pre-charged coolant.
Check the nitrite concentration level at
the next maintenance interval with a
Power Trac 3–Way Test Strip.
106 All information subject to change without notice. (Rev. 01/04)
DDC-SVC-MAN-0058 Copyright © 2004 DETROIT DIESEL CORPORATION