Do not bend the fuel pipes and do not exceed the specified torque. Excessive tightening will twist or fracture
the flared end of the fuel line and result in leaks. Lubricating oil diluted by fuel oil can cause serious damage to
the engine bearings (refer to Pressurize Fuel System - Check for Leaks).
An indication of fuel leakage at the fittings of the fuel injector supply lines and connector nut
seals could be either low lubricating oil pressure (dilution) or fuel odor coming from the
crankcase breathers or an open oil filler cap. When any of the above are detected, remove the
valve rocker cover. A close inspection of the rocker cover, cylinder head, fuel lines, and
connectors will usually show if there is a fuel leakage problem. Under normal conditions, there
should be a coating of lubricating oil throughout the cylinder head area and puddles of oil where
the fuel pipes contact the connectors and where the fuel connectors contact the cylinder head. If
these areas do not have the normal coating of lubricating oil, it is likely that fuel oil is leaking and
washing off the lubricating oil. Remove and replace the leaking fuel pipes and/or connectors.
Reinstall the rocker cover. Then drain the lubricating oil and change the oil filter elements.
Refer to Fuel and Oil Specifications and refill the crankcase to the proper level with the
recommended grade of oil.
6. Perform a complete engine tuneup as outlined in Engine Tuneup. However, if only one injector has been
removed and replaced and the other injectors and the governor adjustment have not been disturbed, it will only
be necessary to adjust the valve clearance and time the injector for the one cylinder, and to position the injector
rack control lever.