MK3 wet sump first start

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Jerry Doe

Jerry Doe

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I thought this was interesting. I have not ridden the 850 for at least 5 months. The oil tank completely empty. Did a movie of first start up after wet sumping. It amazed me how much the engine moves up and down when starting a wet sumped motor. Here it is and had a nice 60 mile ride in Colorado. Snow melted, nice to get out. Some pics after the movie:



Jerry's Norton Commando MK3

Jerry's Norton Commando MK3

  • Media owner Jerry Doe
  • Date added
Colorado - March 2021

Jerry's Norton Commando MK3

Jerry's Norton Commando MK3

  • Media owner Jerry Doe
  • Date added
Colorado - March 2021

I think I am going to take that rack off. Does anyone want to buy it state side?
 
Are you worried about blowing out the crank seal doing that? If you drain a little from the primary (assuming you're using ATF) and it comes out dark...

I don't recall why you took off the breather but a sump full of oil getting pressurized means the oil needs to go somewhere.
 
swooshdave said:
Are you worried about blowing out the crank seal doing that? If you drain a little from the primary (assuming you're using ATF) and it comes out dark...

I don't recall why you took off the breather but a sump full of oil getting pressurized means the oil needs to go somewhere.
Click to expand...
I am not too worried about blowing out the oil seal on mk3. I have a special oil seal in there and it’s held in with circlip. Would be more worried about doing it on 750. I was too lazy to take the oil out...

I know you are going to ask me about the seal. I bought a bunch of them in 2011. They have a ribbed outer edge to lock in. I can’t remember where I got these, other than it was UK. I still have some and will try and find them to take a pic...

I checked and oil level in chain case is normal.

Jerry
 
Jerry Doe said:
I am not too worried about blowing out the oil seal on mk3. I have a special oil seal in there and it’s held in with circlip. Would be more worried about doing it on 750. I was too lazy to take the oil out...

I know you are going to ask me about the seal. I bought a bunch of them in 2011. They have a ribbed outer edge to lock in. I can’t remember where I got these, other than it was UK. I still have some and will try and find them to take a pic...

I checked and oil level in chain case is normal.

Jerry
Click to expand...
And what happened to the breather?
 
I had a Mike xs breather fitted. I honestly don’t think it made much difference. The breather came out of the timing chest and it was connected between that and the oil tank. Ultimately I will get one from Kenny. That will work. I am riding the MK3 this summer or until BSA is done. Then it’s coming off the road to have some head work done. I finished that bike in 2013. I have about 15k miles on it. Pretty much trouble free. Lots of thrashing. I have a crack in the r/h side of the head, exhaust that leaks a little bit. Very annoying. It’s an RH4 head and they are weaker there I believe, plus it was heavily ported.

I must admit I am much happier on my 750. Far more fun and faster...
 
Jerry Doe said:
I had a Mike xs breather fitted. I honestly don’t think it made much difference. The breather came out of the timing chest and it was connected between that and the oil tank. Ultimately I will get one from Kenny. That will work. I am riding the MK3 this summer or until BSA is done. Then it’s coming off the road to have some head work done. I finished that bike in 2013. I have about 15k miles on it. Pretty much trouble free. Lots of thrashing. I have a crack in the r/h side of the head, exhaust that leaks a little bit. Very annoying. It’s an RH4 head and they are weaker there I believe, plus it was heavily ported.

I must admit I am much happier on my 750. Far more fun and faster...
Click to expand...
You will love the one from Kenny.
 
Jerry Doe said:
I thought this was interesting. I have not ridden the 850 for at least 5 months. The oil tank completely empty. Did a movie of first start up after wet sumping. It amazed me how much the engine moves up and down when starting a wet sumped motor. Here it is and had a nice 60 mile ride in Colorado. Snow melted, nice to get out. Some pics after the movie:



Jerry's Norton Commando MK3

Jerry's Norton Commando MK3

  • Media owner Jerry Doe
  • Date added
Colorado - March 2021

Jerry's Norton Commando MK3

Jerry's Norton Commando MK3

  • Media owner Jerry Doe
  • Date added
Colorado - March 2021

I think I am going to take that rack off. Does anyone want to buy it state side?
Click to expand...

Lovely bike Jerry. Really nice rack but I can see why it's going - it doesn't really suit the Roaster look does it ? (Neither do the mudflaps in my opinion).

By the way have you noticed there is a strange kink in your lower chain run in one of the pictures. Maybe a seized link?

Cheers,

cliffa.
 
Thanks I will check the chain. I think it’s the joining link.

I thought I needed a rack in CO to carry leggings etc. changed my mind on that. Will take Harley if it comes to that. The mud flaps are needed here. Stops the motor getting covered in crap. I don’t like the look of them, but they work very well.
 
That is a question I have pondered for a little bit, how long does it take for the oil to drain into the engine from the tank? a week? a fortnight? a month? overnight?

guess I will find out as the one I filled and ran about 2 weeks ago, I will check out in the weekend and see if the tank is empty hehe
 
MacNZ750 said:
That is a question I have pondered for a little bit, how long does it take for the oil to drain into the engine from the tank? a week? a fortnight? a month? overnight?

guess I will find out as the one I filled and ran about 2 weeks ago, I will check out in the weekend and see if the tank is empty hehe
Click to expand...
It varies depending on the bike. Some bikes it will be a few days, other months. Others... never.
 
MacNZ750 said:
That is a question I have pondered for a little bit, how long does it take for the oil to drain into the engine from the tank? a week? a fortnight? a month? overnight?

guess I will find out as the one I filled and ran about 2 weeks ago, I will check out in the weekend and see if the tank is empty hehe
Click to expand...
I thought the MK 111 model would be exempt from wet sumping issues due to the integral piston valve in the timing cover.
 
Torontonian said:
I thought the MK 111 model would be exempt from wet sumping issues due to the integral piston valve in the timing cover.
Click to expand...
I wish, it does not seem to make much difference. Bear in mind it was sitting for 5 months though
 
Torontonian said:
I thought the MK 111 model would be exempt from wet sumping issues due to the integral piston valve in the timing cover.
Click to expand...

It does help to reduce the rate of drainage but doesn't necessarily stop it completely as oil can still drain from the feed side of the pump to the scavenge and then to the sump unless the pump seal modification has been done.

www.accessnorton.com

MK3 timing cover

When the anti wetsumping valve on a MK3 timing cover dosent work what are the usual problems to look for? Not had it apart yet but the piston moves freely The spring and seal are new
www.accessnorton.com www.accessnorton.com
 
Thanks for the Vid Jerry. And there you have it folks, in less than 2mins everything was back to normal. Wet sumping is not really an issue to worry about yet we have countless threads on it. If you are worried take the time to see if your oil is returning and move on .
 
speirmoor said:
Thanks for the Vid Jerry. And there you have it folks, in less than 2mins everything was back to normal. Wet sumping is not really an issue to worry about yet we have countless threads on it. If you are worried take the time to see if your oil is returning and move on .
Click to expand...
Let's see him kick the engine over with that full sump...
 
Jerry Doe said:
He wont be doing that
Click to expand...
If it's like my bike I have a hard time even with a breather moving the oil out. I can kick for a while and about the time I'm exhausted I sometimes have it cleared enough it will spin and start. But just relying on the pump to clear I don't know if I'm young enough to pull that off.
 
swooshdave said:
If it's like my bike I have a hard time even with a breather moving the oil out. I can kick for a while and about the time I'm exhausted I sometimes have it cleared enough it will spin and start. But just relying on the pump to clear I don't know if I'm young enough to pull that off.
Click to expand...

On the Mk3 I have serious starting power thanks to cNw.

Upgraded starter motor
Larger starter wires and ground
The new sprag setup


I have lots of battery power too. Never misses a beat. Even after 5 months without charging the batteries
 
Jerry Doe said:
I had a Mike xs breather fitted. I honestly don’t think it made much difference. The breather came out of the timing chest and it was connected between that and the oil tank. Ultimately I will get one from Kenny. That will work. I am riding the MK3 this summer or until BSA is done. Then it’s coming off the road to have some head work done. I finished that bike in 2013. I have about 15k miles on it. Pretty much trouble free. Lots of thrashing. I have a crack in the r/h side of the head, exhaust that leaks a little bit. Very annoying. It’s an RH4 head and they are weaker there I believe, plus it was heavily ported.

I must admit I am much happier on my 750. Far more fun and faster...
Click to expand...
I weld Norton stuff!
 
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