Engine Systems
DETROIT DIESEL
word "Secondary" is cast on the fuel filter cover for
identification.
No drain cocks are provided on the spin-on filters.
Where water is a problem, it is recommended that a
water separator be installed. Otherwise, residue may
be drained by removing and inverting the filter. Refill
the filter with clean fuel oil before reinstalling it.
A 1" diameter twelve-point nut on the bottom of the
filter is provided to facilitate removal and installation.
Replace the filter as follows:
1. Unscrew the filter (or strainer) and discard it.
2. Fill a new filter replacement cartridge about two-
thirds full with clean fuel oil. Coat the seal gasket
lightly with clean fuel oil.
3. Install the new filter assembly and tighten it to two-
thirds of a turn beyond gasket contact.
4. Start the engine and check for leaks.
Fuel Tank
Refill the fuel tank at the end of each day s operation
to prevent condensation from contaminating the fuel.
Fig. 5 - Typical Spin-On Type Fuel Strainer
CAUTION: A galvanized steel tank should never
and Fuel Filter Mounting
be used for fuel storage because the fuel oil
reacts chemically with the zinc coating to form
powdery flakes which quickly clog the fuel
The filter covers incorporate a threaded sleeve to
strainer and filter and damage the fuel pump
accept the spin-on filter cartridges. The word
and the fuel injectors.
"Primary" is cast on the fuel strainer cover and the
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