Wet Sumping Instead
- Thread starter pierodn
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The oil is supposed to be in the tank as it is returned there by the pump after being circulated around the engine.
The return side of the oil pump is larger and may more powerful than the pressure feed side so it can always remove more oil than the feed can deliver. This is why you should see air bubbles coming back to the tank after engine has been running for minute or two and any oil collected in bottom of engine that has run down from head and timing side gears is removed.
Once the engine is has been running for few minutes and you can see the air bubbles coming from the return pipe inside the oil tank then the level of oil in the tank should not change noticeable.
If the level of oil drops when engine is not running but left for sometime this is called wet sumping.
I hope that is clear for you to understand an you can explain in more detail what your problem is. I think we are having problems with the language barrier. But as you can write in English but we can't use your language then you are doing better than us .
The return side of the oil pump is larger and may more powerful than the pressure feed side so it can always remove more oil than the feed can deliver. This is why you should see air bubbles coming back to the tank after engine has been running for minute or two and any oil collected in bottom of engine that has run down from head and timing side gears is removed.
Once the engine is has been running for few minutes and you can see the air bubbles coming from the return pipe inside the oil tank then the level of oil in the tank should not change noticeable.
If the level of oil drops when engine is not running but left for sometime this is called wet sumping.
I hope that is clear for you to understand an you can explain in more detail what your problem is. I think we are having problems with the language barrier. But as you can write in English but we can't use your language then you are doing better than us .
DogT
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After days or weeks of sitting some of the oil in the tank will drain into the engine. Starting the engine will pump nearly all the oil back into the oil tank. This is normal. Always measure your oil level in the tank after a ride or 3 minutes after starting. I keep mine near the 'L' mark.
How fast the oil drains from the oil tank to the engine depends on how good your oil pump is. See the workshop manual on how to tighten the clearances in the oil pump.
Do not fill the oil tank after the engine has not been started for a time you will overfill and it will come out the breather.
How fast the oil drains from the oil tank to the engine depends on how good your oil pump is. See the workshop manual on how to tighten the clearances in the oil pump.
Do not fill the oil tank after the engine has not been started for a time you will overfill and it will come out the breather.
Re: Not Wet Sumping
Hi.
May be there is a misunderstanting.
The bike has no problems, the oil system and pump work very fine.
I just wanted to say that this 1969 S is the only commando of mine who does not wet sumping as the oil remains in the tank even the bike stops a week!.
Ciao
Piero
Hi.
May be there is a misunderstanting.
The bike has no problems, the oil system and pump work very fine.
I just wanted to say that this 1969 S is the only commando of mine who does not wet sumping as the oil remains in the tank even the bike stops a week!.
Ciao
Piero
ashman
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Not all Nortons wet sump, my 850 never wet sumped in the 37 years of riding but has now started to wet sump in the last 3 years but only if it sits for more than 6 weeks or more as im not riding it as much these days since buying my new Thruxton 3 years ago and doing some more improvements on the Norton.
Ashley
Ashley
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pierodn said:
I had my 1970 Commando timing cover removed for a while and could
see the oil drip through the oil pump despite it was reconditioned.
I guess it is a matter of the condition of the pump.
Or something is blocked...
I have the new Andover oil sump plug installed with the small oil outlet screw so
I don´t have to break out my 40mm wrench to open up the plug an refill the oil in the tank!
pierodn said:
I have sometimes found that the cast iron plate that holds the screws of the pump together sometimes is sticking proud of the pump body, this will prevent the pump face sitting flush with the crankcase when bolted down, all you need to do is file the plate at that point to relieve the high point of the metal.
If you have one that doesn’t wet sump at all-you have a good un :!:
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Another source of wet sumping on the Norton Commando engine which is often overlooked is the oil back draining through and around the oil pressure relief valve when the engine is not running. It's a luck of the draw as to how well your oil pressure relief valve will seal in the timing cover. Apparently Norton addressed this problem with the 850 Mark III by replumbing the oil pressure valve outlet so that it would drain into the timing cavity area instead of being redirected to the inlet side of the oil pump.
On my Norton 850 Commando I modified my timing cover so that the oil pressure relief valve's outlet drains into the timing cavity similar to the 850 Mark III. I found that it made a big difference in helping the wet sumping problem.
Peter Joe
On my Norton 850 Commando I modified my timing cover so that the oil pressure relief valve's outlet drains into the timing cavity similar to the 850 Mark III. I found that it made a big difference in helping the wet sumping problem.
Peter Joe
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