OEM Mercury Grand Marquis Crankshaft

Mercury Grand Marquis Crankshaft Parts and Q&A

• Crankshaft
  2C5Z-6303-BA
  Q: How to service and repair the crankshaft on Mercury Grand Marquis?

  A:

  Service and repair of the crankshaft requires measuring crankshaft main bearing journal diameters from minimum two directions. During examination you must take measurements of journal diameters in two directions at both ends of the main bearing journal to determine its taper and out-of-round condition. The next step requires examining journal clearance only after confirming that crankshaft main bearing journals meet design specifications. Install Plastigage(R) pieces across the crankshaft main bearing surfaces without moving the crankshaft before installing the main bearing cap. The crankshaft journal clearance should be checked by following the process of installing and removing the crankshaft main bearing cap. Use a Dial Indicator Gauge to check the end play of the crankshaft by first setting the crankshaft behind the cylinder block with the indicator read to zero and finally moving it in front to measure and write down the end play results. You can check crankshaft runout through main bearing journal examination followed by Dial Indicator Gauge usage which requires crankshaft rotation then a subtraction between maximum and minimum readings. The measuring process for connecting rod bearing journal taper and out-of-round requires checking connecting rod journal diameters at both ends in perpendicular directions while maintaining measurements inside the wear limits. Complete the inspection by measuring connecting rod Piston clearance to validate whether it meets specifications.