1970 Johnson 115 HP Outboard Motor Service manual, Page 59Get this manual
STRIPES SIZE)
SELECTING THE CORRECT RINGCrankshaft replacements do not require ring fitting since each new service crankshaft is already fitted with six seal ringsInstances in which seal ring has been broken accidentally during repairs are easily remedied by measuring the thickness of the original ring with 0- inch micrometerAlways measure the ring near its outer edgeUpon determining the thi ckness of the ld ring, install ne ring that matches this thi cknessThree different thickness seal ings are available(See SEAL RING IDENTIFlCATlON CHART SEA RING IDENTIFICATION CHART SE RVICE PART NOWIDTH IN INCHES IDENTIFICATION MARKINGS 310044 310045 310046 .1565 to 1570 .1575 to .1580 .1585 to .1590 ONE white stripe TWO white stripes THREE white stripes