Q) An aux. Engine tends to hunt to such an extent that the engine speed variation prohibits the connection of the machine to the switchboard.
a) Possible causes of hunting b)& how to rectify
Ans:)
Possible Causes Rectification
Leakage or Breakage of Tighten or Replace
Fuel High Pressure Piping
Defective function of nozzle Leaky Nozzle - Clean or Replace
Uneven injection pressure through
nozzle - Adjust
Damaged Spring of Nozzle Holder - Replace
Defective function of injection pump Infiltration of air inside pump - Bleed air
Periodical hitch of plunger - Clean
or Recondition
Damage to Plunger Spring Replace
Wear to hitch of Tappet Roller Replace or Recondition
Improper positioning of Rack Adjust
Defective function of Delivery Valve
a)Damage to delivery valve spring Replace
b)Damage or Leakage of Delivery Valve Replace or Clean
c)Hitch of Delivery Valve Recondition or Replace
Defective Function of booster pump Recondition
Clogging due to dirty fuel filter Clean
Defective tachometer cable Replace
Governor malfunction
Dirty oil(sludge) in governor Drain Oil, clean governor and refill
Lost motion in engine linkage
or fuel pumps Repair governor; linkages and/or pumps
Spring on yield linkage to fuel
racks too weak Return governor to Factory for Repair
Power Piston is sticking Check for side play or bending of
output shaft
Faulty Linkages Check yield links, shutdown arrgts. etc.
Load Limit Shaft bent Replace
Governor Worn Return governor
Compensation Adjustment incorrect Adjust the needle valve &
Compensation adjusting pointer
Friday, March 26, 2010
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