Norton Anti Drain Check Valve (for engines that Wet Sump)

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

I use a big bolt stuck up the oil line, it pokes out where it can be seen, however there is still a danger of forgetting to refit the oil line before starting the engine. I bought an ugly tap for it, however have never used it - the big bang must be avoided at all costs. Commandos engines are really good - certainly beyond my expectations, but you have to tolerate some things. They are what they are.

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

When you got the kit did it come with instructions to prime with oil below the valve ?

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Yes, it was well primed. I ran with the valve for a couple of weeks, daily. I got sick of seeing zero oil pressure at idle with hot oil.

The pump is designed to be gravity fed. With a check valve in the input line the pump must provide enough suction to overcome the pressure of the spring to receive oil. In my case, there wasn't enough suction at idle to overcome the spring pressure.[/quote]


Do you still have the valve?
Can you measure the diameter of the spring?
Can you send photo of the (cut down ) spring?

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

Bernhard said:

When you got the kit did it come with instructions to prime with oil below the valve ?

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Yes, it was well primed. I ran with the valve for a couple of weeks, daily. I got sick of seeing zero oil pressure at idle with hot oil.

The pump is designed to be gravity fed. With a check valve in the input line the pump must provide enough suction to overcome the pressure of the spring to receive oil. In my case, there wasn't enough suction at idle to overcome the spring pressure.

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Do you still have the valve?
Can you measure the diameter of the spring?
Can you send photo of the (cut down ) spring?

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I think I pitched it a long time ago. I do remember throwing it under the bench out of frustration after I had modified the spring.

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

Bernhard said:

Anyone had any experience of using this?

http://www.ebay.co.uk/itm/290983989793? ... 1756wt_904

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I have one like that for the last 6 years, also have a oil pressure guage (most important). No issues and put on perhaps 9,000 miles with it. :|

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

travelerjerry said:

Bernhard said:

Anyone had any experience of using this?

http://www.ebay.co.uk/itm/290983989793? ... 1756wt_904

Click to expand...

I have one like that for the last 6 years, also have a oil pressure guage (most important). No issues and put on perhaps 9,000 miles with it. :|

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You don't say how much oil pressure you have at idle with hot oil.

No doubt the oil pump condition is a factor. In my case, the pump was new. Although new does not mean optimum.

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

"Although new does not mean optimum"

Yes, N E W means Never Ever Worked.

I run into that on an almost daily basis working on a boat during a few months every summer - new parts that don't work and it's commonly accepted - I could go on and on specifically re Deroit-Diesel type fuel injectors which seem to have a non-working percentage of at least 30%. If you need 8 you order 12 and return the ones you don't use.

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

xbacksideslider said:

Just kick it through a few times before you switch the key on. Better still put a reed valve on your crankcase breather.

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I have read this elsewhere, so I tried it with my mk3. It has been sitting for about four months now due to a charging issue, long enough for the oil tank to have lost all of its contents to the sump. The pump seems to be healthy, it certainly flows a lot of oil with the engine running, however kicking it thru about twenty times only produced a dribble of oil. To get enough oil back in the tank to cover the screen would take hours of kicking at the rate of flow seen. A few kicks doesnt return any significant oil to the tank, with either the MK 3 or the 650 SS (late model, 6 start pump)

The mk 3 oil tank level only drops an inch or so per month, so wet sumping is only a problem after a really prolonged period of sitting. Perhaps the MK3 factory antisump mechanism is helping with that, and also perhaps it is the reason why there is negligible flow at kickstart rollover. This may not be enough to overcome the antisump mechanism.
Don't know why the 650 doesnt flow moreat kickover, it has no antisump mechanism and produces a gusher of a flow at idle.

Glen

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

It is bad juju to turn a Norton engine at less that cam break in rpm, ie:2000ish to surf the liters on the lobes. Worse thing to do is kicker slow turn engine even when stored and not starting over a winter as sad tales exist of doing this including Jim Comstock learning curve balls. If not enough oil in tank to feed oil pump a few seconds after start then add some and start and run right up to 2000 ish which will empty sump in under a min. There's a few stories of crank seals leaking after wet sump starts but very rare compared to what is gained by crank sling wet sump onto cam lobes. The ZAPP protective layer is only nano thick and only laid down on surfaces over 200'F and is wiped off below 2000ish rpm so just idling full temp removes layer we hear so so much about on flat tappet engines, so best practice it after a run to shut right off - though that is so so hard to do for me as the idle is so so delicious to hear and feel.

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

worntorn said:

The pump seems to be healthy, it certainly flows a lot of oil with the engine running Glen

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I am afraid that doesn't say much about the condition of the pump. The only proper way to find out if your pump will produce enough pressure is to (temporary) put a gauge in the pressure line.

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

Try a the amr mod. Still sumps but at 5% of normal

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

rgrigutis said:

Try a the amr mod. Still sumps but at 5% of normal

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Exactly what I did. If you have the "O" ring mod on the pump and the timing cover mod, oil sumping is practically nil. I guess the pump itself leaks.

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

I have made a small observation that might have some bearing on these anti drain valves, on other bikes it is mounted vertically and not at an angle like on the Norton. This will enable the ball bearing to be pushed centrally into its seat, allowing for the use of the weakest spring possible.



.............velo 1..............................

Re: Norton Anti Drain Check Valve (for engines that Wet Sump

Bernhard,
FWIW I installed one of ironjohns valves on my bike and am very pleased with it.Very well put together and sealed on where the wires exit.My piece of
mind made the price of the unit justifiable.
YING