Pair crankcase SEALS for the Vire 6 BVR engines (Vire 7/Vire 12 requires 3 seals per engine).
This is for 2 (pair) as you will always change a pair on a Vire 6.
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Common Faults & Additional Info
Will need replacing if they loose sealing ability (if the engine overheats or rusts, the lips weld/roughen and the springs rot inside) and if you are replacing crankshaft into crankcase generally (e.g. rebuild/replace bearings)
If you are replacing main bearings, then you should always replace these.
The Vire 6 in particular is subject to saltwater rolling in on port tack -from the expansion chamber and rotting the bearings and seal springs slowly when laid up. The Vire 7&12 removed this design weakness but still allow salt air into the crankcase like any marine 2-stroke, and condensation-pumping will do the rest if the engine is not run for weeks.
When the seals fail - you could get 2 problems:
1 petrol (the gear/aft end heats up more than the flywheel/fore end) seeps into the gearbox.
2 petrol seeps into the flywheel/points get dirty - also slight loss of compression/power.
Check to see if your Vire has deteriorated seals: remove points inspection cover/ flywheel: if there is any oil dribbling below the points/ignition plate, it is a sure sign.
If the front main bearing is rusted, it is quite likely it has a leaking seal too.
There is little point replacing seals onto a rough or pitted shaft.
Seal lips and springs have to point towards the pressure/piston.
On the Vire 7 the third seal faces the gear oil, but on the vire 6 there is no third seal - just a special seal cage which is a sod to remove even with the gearbox off.!
Easy to fit the front one with the crank out but the rear one is in a difficult to prize our cage - thats a bigger job.
For any further assistance please contact me.