Standard bearing

If bearing is in malcondition, or bearing clearance is out of specification, select a new standard bearing according to the following procedure and install it.

1. First check journal diameter. As shown in figure, crank web has stamped numbers and alphabet at the center. Three kinds of numbers ("1", "2" and "3") represent the following journal diameters.

   Journal diameter

   Fig 1: Journal Diameter Specifications Chart

   Courtesy of SUZUKI OF AMERICA CORP.
   Fig 2: Identifying Crankshaft & Crank Web Identification Numbers

   Courtesy of SUZUKI OF AMERICA CORP.
2. Next, check crankcase (bearing cap) bore diameter without bearing.

   On lower surface of lower crankcase, 4 alphabets are stamped as shown in figure. Three kinds of alphabets (A, B and C) represent the following cap bore diameters.

   Main bearing cap bore diameter

   Fig 3: Main Bearing Cap Bore Diameter Specifications Chart

   Courtesy of SUZUKI OF AMERICA CORP.
   Fig 4: Identifying Main Bearing Cap Bore Diameter

   Courtesy of SUZUKI OF AMERICA CORP.
3. There are 5 kinds of standard bearings differing in thickness. To distinguish them, they are painted in following colors at the position as indicated in figure.

   Each color indicates the following thickness at the center of bearing.

   Standard size main bearing thickness

   Fig 5: Main Bearing Thickness Specifications Chart

   Courtesy of SUZUKI OF AMERICA CORP.
   Fig 6: Identifying Color Mark

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4. From number stamped on crank webs at its center and alphabets stamped on crankcase lower side, determine new standard bearing to be installed to journal, by referring to table in the following.

   For example, if number stamped on crank webs is "1" and alphabet stamped on crankcase is "A", install a new standard bearing painted in "Black" to its journal.

   New standard size bearing specification

   Fig 7: Identifying Number Stamped On Crank Web (Journal Diameter) Specifications Chart

   Courtesy of SUZUKI OF AMERICA CORP.
5. Using gaging plastic, check bearing clearance with newly selected standard bearing.

   If clearance still exceeds its limit, use next thicker bearing and recheck clearance.

6. When replacing crankshaft or cylinder block and crankcase due to any reason, select new standard bearings to be installed by referring to number stamped on new crankshaft or alphabets stamped on new crankcase lower side.