|
In the above picture I am measuring the ring grove with a Vermeer caliper to confirm size for ordering new rings. A Vermeer caliper is not as accurate as a micrometer, but will give a quick and reasonably accurate measurement. The compression ring groves measures .186 and the oil ring grove measured .310 which is approximately equal to 3/16" and 5/16" respectively.
A little on shop on math. You can convert decimal to fractions by multiply, for example, .310 by 16 to arrive at the numerator. In this case .310 times 16 rounded is equal to 5 or 5/16". Conversely you can arrive at decimals from fractions by dividing the numerator by the denominator. In the case of 5/16", five divided by sixteen equals .3125. 5/16" could be called the nominal measurement.
I used a borrowed ring grove cleaner to remove built up carbon in the ring groves. Over the years carbon built up in the ring groves under the rings. This build up is the worst on the top ring grove.
I used a putty knife to clean the carbon off the top of the piston. At the edge, I found the part number "B2383-R" and "045 oversized" stamped in the piston. This confirmed what I had found from measuring the piston skirt. T the piston was oversized.
|
|
