New-type ridgeless magneto-side crankshaft oil seal
Posted: Sun Jan 18, 2015 1:36 pm
It seems as if the 25-50-10 magneto-side crankshaft oil seal is no longer available in its original form; i.e. with a locating ridge which engages with the groove in the engine casing.
A set of crankshaft oil seals purchased recently, with the new-type ridgeless magneto-side seal nearest the camera.
Some research has revealed that the original seal (Kawasaki part no.92049-1302) is no longer available and I can't seem to find any reference to any correct pattern aftermarket seal (with the locating ridge) still being available either.
Since there is nothing (other than compression between the two crankcase halves) to keep the seal in position, I am wondering whether it may be displaced by vibration and/or pressure inside the left-hand crankcase. Whether this happens after a short time or a long time remains to be seen - if it is a problem at all .
Has anyone used one of these ridgeless seals? If so, for how long? Any problems?
The new-type ridgeless magneto-side seal installed.
I have devised a simple means for preventing the seal from being forced outwards, although it requires a small modification to the magneto flange. A retainer, made from (perhaps) 2mm aluminium plate would be installed between the engine casing and the magneto flange. To keep the magneto rotor and stator in the same position relative to each other, it would be necessary to machine 2mm from the inner face of the magneto flange.
Cardboard prototype of proposed seal retainer in position.
Before I modify anything, can anyone offer the benefit of their experience with the ridgeless seal?
Thanks & regards,
James
A set of crankshaft oil seals purchased recently, with the new-type ridgeless magneto-side seal nearest the camera.
Some research has revealed that the original seal (Kawasaki part no.92049-1302) is no longer available and I can't seem to find any reference to any correct pattern aftermarket seal (with the locating ridge) still being available either.
Since there is nothing (other than compression between the two crankcase halves) to keep the seal in position, I am wondering whether it may be displaced by vibration and/or pressure inside the left-hand crankcase. Whether this happens after a short time or a long time remains to be seen - if it is a problem at all .
Has anyone used one of these ridgeless seals? If so, for how long? Any problems?
The new-type ridgeless magneto-side seal installed.
I have devised a simple means for preventing the seal from being forced outwards, although it requires a small modification to the magneto flange. A retainer, made from (perhaps) 2mm aluminium plate would be installed between the engine casing and the magneto flange. To keep the magneto rotor and stator in the same position relative to each other, it would be necessary to machine 2mm from the inner face of the magneto flange.
Cardboard prototype of proposed seal retainer in position.
Before I modify anything, can anyone offer the benefit of their experience with the ridgeless seal?
Thanks & regards,
James