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JerrySun Jun-25-06 12:48 AM

  
"wetsumping"


  

          

What is really wrong with wet sumping? I'm new to Norton and never in 27 years had a problem with my Triumph.

  

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Steve FordWed Nov-13-02 01:55 AM
Member since Mar 18th 2009
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#1. "RE: wetsumping"
In response to Reply # 0


  

          

All of the oil ends up in the sump so it's a bit harder to kick it over and then it tends to shoot the excess out the breather, can cause you to foolishly add more oil to what looks like a dry tank which just makes matters worse and is just kind of aggravating.
For what it's worth, even with a drained oil tank, drained sump and removed and replaced timing cover, there's still quite a bit of oil hiding in the engine. My Atlas now makes semi-erotic noises from the vent line when it's kicked over due to being overfilled.

Steve Ford

  

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MichaelBWed Nov-13-02 01:49 PM
Member since Mar 18th 2009
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#2. "RE: wetsumping"
In response to Reply # 1


  

          

On the later Commandos with the 'Better' Breather, it doesn't allow it to blow out the breather as much as it does pumping up through the rings on inital start up and blowing oily smoke. To the new Norton owner, this gives faulty symptoms as to engine condiiton. Alot of Nortons have been torn down due to this faulty sympton.
Besides the smoke, it can also cause blown base gaskets, crank seals etc.


Mike

  

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txnortonThu Nov-14-02 10:16 AM
Member since Mar 18th 2009
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#3. "RE: wetsumping"
In response to Reply # 0


  

          

My biggest problem with wetsumping was due to having the wetsumped oil in the crankcase blown through the crankshaft mainseal into the primary case when kick-starting the engine. The overfilled primary would then leak the oil out the inner primary case mainshaft felt seal.

There seems to a bias by some people against using the anti-drain spring check valves that mount in the feed line (hose) from the oil tank to the engine. However, I have installed one of these (along with an oil pressure gauge) on each of my five Commandos and have eliminated the wetsumping problems. I have not experienced any problems with the anti-drain valves.

Regards,

Craig D.
Katy, Texas

  

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Riverrat MikeSun Jun-25-06 12:47 AM
Member since Mar 18th 2009
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#4. "RE: wetsumping"
In response to Reply # 3


  

          

About 15 years back, when I got my Norton, which was also my first Brit bike, I was unaware of the wetsumping thing. I just got on the bike and kicked it alive and went on my way. Then, one time, I checked the oil after it had been sitting a few months and went into a panic. Fortunately I had friends that had other old super twins and clued me in. But after that I started doing things like pouring a little oil in and starting it up for about 20 seconds to get the oil circulating, etc. Bad idea, I was better off not knowing about the situation.

But now the bike has been sitting for a few years. Now what? Should I squirt a little oil in the cylinders or take any other precautions?

Any help would be greatly appreciated. TIA, Mike

  

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johnandnzWed Jun-28-06 05:16 PM
Member since Mar 18th 2009
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#5. "RE: wetsumping"
In response to Reply # 4


  

          

Change the oil (and filter if it has one), change the gearbox and primary case oil. Take off both exhasut and inlet rocker covers and pour in about 150 mm in each. This is mostly to get oil around the camshaft before starting. Check for oil return in the tank. - and you should change the fork oil and check swinging arm as well.

  

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zeeroSun Jul-09-06 03:38 AM
Member since Mar 18th 2009
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#6. "RE: wetsumping"
In response to Reply # 5
Sun Jul-09-06 03:40 AM by zeero

  

          

>Change the oil (and filter if it has one), change the gearbox
>and primary case oil. Take off both exhasut and inlet rocker
>covers and pour in about 150 mm in each. This is mostly to get
>oil around the camshaft before starting. Check for oil return
>in the tank. - and you should change the fork oil and check
>swinging arm as well.

Howdi,at what sort of intervals would you suggest doing the above oil "top up" shall we say through the rocker covers?Circumstances sometimes dictate that i only get to ride about every 2-3 mths.I always drain the oil & put it back in the tank which doesn't really bother me but i have been thinking about the times its just been sitting.Should i kick it over every now & then & before startup pinch some of the oil from drainage process & put it in the "tops"?

  

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Norton Commando Oil Change