Es2 plunger

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May 10, 2020
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Ive a 48 ES2. It's always wet dumped but recently it's getting worse and has begun leaking from the crank oil seal quite badly as the sump fills. As I turn the crank by hand I can hear air coming from the seal. Should the seal be oil tight under these circumstances or should I consider replacing the seal? I've been informed that it would involve splitting the engine to replace the seal. I need to check the breather at the top of the crank. This requires removing the chaincase and drive gear. Unfortunately I am unable to lock the engine sufficiently to remove the nut. Any suggestions? I'm learning as I go.
 
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I have a '55 ES2 which wet sumps. When the oil gets above the centre of the crankshaft it starts to spill out onto the floor but it isn't from the crank seal, it's from the breather. Yours could be the same. I fitted a valve in the feed pipe between oil tank and engine. I have a big reminder on the handlebars to make sure I turn it on before I ride. So far I have only forgotten to turn if off and ended up with a puddle of oil a few days later.
 
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I have a '55 ES2 which wet sumps. When the oil gets above the centre of the crankshaft it starts to spill out onto the floor but it isn't from the crank seal, it's from the breather. Yours could be the same. I fitted a valve in the feed pipe between oil tank and engine. I have a big reminder on the handlebars to make sure I turn it on before I ride. So far I have only forgotten to turn if off and ended up with a puddle of oil a few days later.
Yes, I have considered that. I'm just scared of having a senior moment and forgetting. Any advice on locking the engine sufficiently to get the nut off the end of the crank. Paul.
 
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Yes, I have considered that. I'm just scared of having a senior moment and forgetting. Any advice on locking the engine sufficiently to get the nut off the end of the crank. Paul.
Put it in top gear and stand on the rear brake or block the back wheel with something, or both.
 
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Jan 18, 2020
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The mean way to remove the sprocket nut is to use an air impact wrench.
Some people have made a special tools locking the engine sprocket to the clutch sprocket.
 
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Recondition your oil pump to reduce the gear end float. There was an excellent article written on this subjectr by John Hudson the factory customer service manager.
 

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