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 the 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: Crank Main Journal Diameter Chart

   Courtesy of SUZUKI OF AMERICA CORP.
   Fig 2: Locating Crank Web Stamped 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 the 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 Chart

   Courtesy of SUZUKI OF AMERICA CORP.
   Fig 4: Locating Main Bearing Cap Bore Stamping

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

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

   Standard size main bearing thickness 

   Fig 5: Standard Size Main Bearing Thickness Chart

   Courtesy of SUZUKI OF AMERICA CORP.
   Fig 6: Locating Main Bearing Paint Mark

   Courtesy of SUZUKI OF AMERICA CORP.
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 referring to the table shown below.

   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.

   Fig 7: New Standard Size Main Bearing Specifications Table

   Courtesy of SUZUKI OF AMERICA CORP.
5. Using gauging 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.