Inspection Of Hoses And Fittings For Fuel Leaks - Detroit Diesel DD15 EuroIV Operator's Manual

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Routine Preventive Maintenance

NOTICE: Never use galvanized steel fuel tanks, fittings, pipes, or supply

lines. The fuel reacts chemically with the zinc coating to form powdery

flakes that can quickly clog the fuel filters and damage the fuel pumps and

injectors.

6. Every 120,000 miles (200,000 kilometers) or 12 months, tighten all fuel tank

mountings and brackets. At the same time, check the seal in the fuel tank cap,

the breather hole in the cap, and the condition of the flexible fuel lines.

Repair or replace the parts, as necessary.

Inspection of Hoses and Fittings for Fuel Leaks

A pre-start inspection of hoses and fuel lines is recommended. Make a visual check

for fuel leaks at all engine-mounted fuel lines and connections, and at the fuel tank

suction and return lines. Since fuel tanks are susceptible to road hazards, leaks in

this area may best be detected by checking for an accumulation of fuel under the

tank.

WARNING: HOT OIL

To avoid injury from hot oil, do not operate the engine with the

rocker cover(s) removed.

NOTE: Leaks are not only detrimental to machine operation, but they can

also result in added expense caused by the need to replace lost fluids

Inspection of Hoses and Fittings

Check hoses daily as part of the pre-start inspection.

• Examine hoses for leaks, and check all fittings, clamps and ties carefully.

• Make sure hoses are not resting on or touching shafts, couplings, heated surfaces

including exhaust manifolds, sharp edges, or other obvious hazardous areas.

• Since all machinery vibrates and moves to a certain extent, clamps and ties can

fatigue with age. To ensure continued proper support, inspect fasteners

frequently and tighten or replace them as necessary.

• If fittings have loosened or cracked, or if hoses have ruptured or worn through,

take corrective action immediately.

Inspection of Hoses with Extended Service Life

A hose has a finite service life. With this in mind, inspect hoses as follows:

NOTE: Fire-resistant fuel and lubricating oil hose assemblies do not require

automatic replacement after five years of service or at major overhaul, but

should be inspected carefully before being put back into service.

All information subject to change without notice.

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