TRUCK SERVICE MANUAL
Engine Oil Level
"B" MAINTENANCE CHECKS
1. Check oil level with dipstick oil gauge located on
the engine. For accurate readings, oil level should not
At each "B" Maintenance Check, perform all "A" Checks
be checked until oil has settled into pan after engine
in addition to the following.
shutdown. Keep dipstick with the engine and oil pan with
which it was originally furnished. Keep oil level as near
Change Engine Oil
"H" (high) mark as possible.
General Limits For Oil Change
Caution: Never operate the engine with oil level
below "L" (low) mark or above the "H" (high) mark.
1. Minimum Viscosity (Dilution limit): Minus one
SAE grade from oil being tested or point equal to a
2. Add oil as necessary of the same quality and
minimum containing five percent by fuel oil volume.
brand as already in the engine. See Section 3.
2. Maximum Viscosity: Plus one SAE grade from
oil being tested, or ten percent increase at 210 deg. F
Check Oil Bath Cleaner Oil Level
[99 deg. C] or 25 percent increase at 100 deg. F [38
Daily check oil level in oil bath air cleaner to be sure oil
level in oil cup is at indicated mark. To remove oil cup,
3. Sediment Content: Normal penetane insoluble
loosen wing nuts. During wet weather and in winter
1.0 to 1.5 percent. Benzine insoluble 0.75 to 1.0 percent.
months, excessive moisture in air cleaner oil sometimes
4. Acid Number: Total number 3.5 maximum.
causes cleaner to become flooded and results in oil
5. Water Content: 0.2 percent maximum.
pullover or plugging of the bottom air cleaner screen.
6. Additive Reduction: 25 percent maximum.
Add or change oil as necessary.
Caution: If the above tests indicate presence of any
Check Completely For Damage
bearing metal particles, or if found in filters, the
Visually check fuel system, aneroid, if used, etc. for
source should be determined before a failure results.
misadjustment or tampering, check all systems and
connections for leaks or damage.