You can assemble the caps and measure the bores first to disclose the size of the largest bore in order to determine how much it must be reduced. Bore size of Bearing. Like in the case of the fan, there might be imbalance loads.
First you have to determine if your crankshaft has been turned or is stock size. For example, if the maximum journa l diameter is 2.1250” and the minimum specified bearing clearance is .0005″, then the inside di ameter of the bearing is 2.1255″. This will tell you if a bearing size will provide acceptable performance in your engine. If the bearing caps were lost, and replacement caps were procured, then it has to be line bored to restore original bore size. If your crankshaft has been used or reground it is a good idea to measure it or ask your machinist to measure the journals. We can calculate whether they both are load bearing solutions. If they are out-of-round more than .002″, main bearing life will be reduced. It is a good plan to check main bearing caps for flatness whenever they are removed, Fig. The third and fourth digit of bearing patter number indicates the bore size of bearing.
Bearing part numbers help you to identify the type, size and general uses for a bearing. Standard size bearing shells are m ade so that their inside diameter equals the maximum journal diameter plus the minimum specified bearing clearance. Using the Yamaha R6 bearing color code chart (pictured below), you can determine the bearing size for each connector rod.
Crankshaft main bearing clearance: 0.0008-0.0023" (0.020-0.058 mm) Connecting rod bearing clearance: 0.0008-0.0022" (0.020-0.055 mm) Here are all of the bearing classifications from the Chilton.
If we know the distances, we can use stats to determine the load on the bearing.
The remedy is to install semi-finished main bearings and line bore them to size.
WARPED MAIN BEARING CAPS.
Check bores with in side micrometer. In general, the bore size is equal to five times the third and forth digit of bearing’s patter number. You can calculate the load on a main or rod bearing. Crankshaft main bearing bores may go out-of round in use. However, from ‘0’ to ‘3’, this formula does not imply.
Repeat this for all four con rods. There are three different types of bearings. If you have a new VW Type 1 crankshaft, whether it's a stroker crank or stock crankshaft, it will be machined to the standard size of 2.164". Bearing Calculator This program will help you determine if your crankshaft bearings are suitable.
It is the inner diameter of the bearing and measured in millimeters. Size the Yamaha R6 connector rod bearings by taking the first connector rod bearing number and subtracting the first crankshaft/connector rod bearing number from it.
This program assumes that all bearings are made from 932 (SAE 660) bearing bronze.
There’s also loads that don’t necessarily think to consider. Ball bearings are loose spheres that separate the races in a bearing.
44. The part number is usually stamped or printed on the bearing.
EXAMPLE: 5H - 1 = 4.
I've searched on "my internet" and "The Google" for a guide on how to select bearings, but I'm still pretty lost. Roller bearings are circular shaped and function the same way as ball bearings. Typical procedure is to shave 0.010" of all bearing caps to reduce the bore.