Engine System: Assembly: Engine: Assembly

All engines 

1. Record the main bearing code found on the front of the engine block.
Fig 1: Identifying Main Bearing Code Found On Front Of Engine Block
Courtesy of FORD MOTOR CO.
2. Record the main bearing code found on the back of the crankshaft.
Fig 2: Identifying Main Bearing Code - Found On Back Of Crankshaft
Courtesy of FORD MOTOR CO.
3. Using the data recorded earlier and the Bearing Select Fit Chart, Standard Bearings Chart determine the required bearing grade for each main bearing.
   • Read the first letter of the engine block main bearing code and the first letter of the crankshaft main bearing code.
   • Read down the column below the engine main bearing code letter, and across the row next to the crankshaft main bearing code letter, until the 2 intersect. This is the required bearing grade for the No. 1 crankshaft main bearing.
   • As an example, if the engine block code letter is "F" and the crankshaft code letter is "D," the correct bearing grade for this main bearing is "2."
   • Repeat this process for the remaining 4 main bearings.
Fig 3: Bearing Select Fit Chart (Standard Bearings)
Courtesy of FORD MOTOR CO.
4. If oversize bearings are being used, use the procedure in the previous step and the Bearing Select Fit Chart, Oversize Bearing Chart to determine the required grade for each main bearing.
Fig 4: Bearing Select Fit Chart (Oversize Bearings)
Courtesy of FORD MOTOR CO.