Maintenance Tips of Cummins NT Diesel Engines
B-Check
At each “B” Maintenance Check, perform all “A”
Checks in addition to the following.
Maintaining a proper “B” maintenance check
interval is a very important factor in preserving the integrity of an engine.
Lubricating oil contamination is the direct result of engine operation, the
load factor involved and the amount of fuel the engine consumes.
Note: If the lubricating oil is drained from the oil pan to make an
engine repair, new oil must be used. Do not use oil after it has been drained
from the oil pan.
Lubricating Oil Change Intervals
1. The recommended oil change interval is
determined by the “Chart Method” based on fuel oil consumed and lubricating oil
added. See “Chart Method” following.
2. An alternate to the “Chart Method” is 250
hours or 6 months.
3. A second alternate method of determing oil
change interval may be established through the use of oil analysis. Refer to
“Lubricating Oil Analysis.”
Chart Method
Advancement in lubrication technology has made
it possible for users of Chong Qing-Cummins engines to
successfully extend oil change intervals, thus reducing maintenance costs.
Note: At oil change,
change full-flow filter, bypass filter or comfo filter and fuel oil filter.
Lubricating oil change intervals depend on the
following variables.
1. Fuel consumption per hour
2. Oil consumption per hour
3. Filtration systems.
4. Lubricating system capacity.
The following graphs are to be used to
determine the proper oil change interval for engines.
Total lubricating system capacity (in gallons)
can be determined by adding the oil pan (high level). full-flow filter(s) and
by-pass filter(s) capacities. Total lubricating capacities must be rounded to
the nearest gallon. See example following.
Lubricating Oil Filter and
Oil Pan Standard Capacity |
|
Combo filter(LF9009) |
0.7gal. |
Full-flow filter(LF670) |
0.7gal. |
By-pass filter(LF777) |
0.6gal. |
Oil pan capacity(H) (all oil pan except 193631) |
9.5gal. |
Oil pan capacity(H) (193631) |
9.5gal. |
Note: Cummins Engine Company , Inc. does not recommended exceeding 600
hour oil change intervals. Therefore, curves are limited to 600 hours and
should not be extended.
Example:
Marine Engine With 750 By-Pass Filter
Lubricating System Capacity – 16 Gallons
Fuel Consumption: 17.5 Gallons/Hour
Oil Consumption: 8 Hours Per Quart
Recommended Oil Change Interval: 310 Hours
Lubricating Oil Analysis
An alternate method for determinating when to
change lubricating oil is by oil analysis, using laboratory tests. A new series
of test should be run if filters, oil brands or grades are changed.
In the beginning, tests should be made each
100 gallons of fuel consumed (after the first 400 gallons), or 20 hours (after
the first 100 hours) until the analysis indicates the first oil change is
necessary.
Analysis Test for Lubricating Oil
Check oil properties in the following list
during analysis. These methods are fully described in the American
Society for Testing Materials Handbook.
Oil Property
|
Test Number |
Viscosity at 100°F and 210°F [38°C to 9°C] |
ASTM-D445 |
Sediment
|
ASTM-D893 |
Water |
ASTM-D95 |
Acid and Base Number |
ASTM-D664 |
General Limits for Oil Change
1. Minimum Viscosity (dilution limit): Minus
one SAE grade from oil being tested or point equal to a minimum containing five
percent by volume of fuel oil.
2. Maximum Viscosity: Plus one SAE grade from
oil being tested, or ten percent increase at 210°F [99°C] or 25 percent
increase at 100°F [38°C].
3. Sediment Content: Normal pentane insolube
1.0 to 1.5 percent. Benzine insoluble 0.75 to 1.0 percent.
4. Acid Number: Total number 3.5 maximum.
5. Water Content: 0.2 percent maximum.
6. Additive Reduction: 24 percent maximum.
Caution: If the above tests indicate
presence of any metal particles, or if found in filters, the source should be
determined and corrective action taken before a failure results.
Change Engine Oil
Oil change at “B” Check, as shown in the
maintenance chart, is for average conditions.
1. Bring engine to operating temperature, shut
down engine, remove drain plug from bottom oil pan, and drain oil.
2. Install drain plug in oil pan, and torque
to 60 to 70 ft-lbs ]81 to 95 N*m]
3. Fill the crankcase to “H” (high level) mark
on the dipstick.
4. Start engine and visually check for oil
leaks.
5. Shut down the engine; allow 15 minutes for
oil to drain back into the pan; recheck the oil level with the dipstick. Add
oil, as required.
Note: Use lubricating oil meeting
specifications listed in Section 3, and genuine Cummins filters on equipment.
Change Spin-On Lubricating Oil Filter
Elements
1. Unscrew combination case and elements, Fig. 2-10, discard elements.
Note: At each filter changes check torque on adapter or insert; it
should be 25 to 35 ft.lbs ]34 to 47 N*m]. If they are not within torque range,
they may rotate when the spin-on filter is removed. Replace the adapter or
insert to the filter head gasket at each “C” maintenance check.
2. Fill the filter with lubricating oil. Apply
a light even coat of lubricating oil to the gasket sealing surface prior to
installing the filter.
3. Position element to the filter head,
fig.2-16. Tighten by hand until the seal touches the filter head, tighten an
additional one-half to three-fourth turn.
4. Run the engine, check for leaks, reacheck
engine oil level; add oil as necessary to bring the oil level to “H” mark on
the dipstick.
Note: Always allow oil to drain back to the oil pan before
checking the level. This may require 15 minutes.
Change Fuel Filter Element
Spin-on Type Filter
1. Unscrew and discard the spin-on type fuel
filter, fig.2-19 and 2-20.
2. Fill the new filter with clean fuel and apply a light even coat of lubricating oil to the gasket sealing surface prior to installing the filter.
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