MK3 timing cover

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baz

baz

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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
 
baz said:
When the anti wetsumping valve on a MK3 timing cover dosent work what are the usual problems to look for?
Click to expand...

What do you mean by "doesn't work"? Do you mean the oil is still draining to the sump? If so at approximately what rate as the valve won't always stop the draining completely but slows it down as there are other ways for the oil to drain to the sump (along the pump shaft etc.).

baz said:
Not had it apart yet but the piston moves freely
Click to expand...

How do you know without removing the timing cover?
 
Sorry I should have said the bike still wet sumps
The piston was free to move when I fitted timing cover 6months ago
Of course it could now be stuck
The oil tank drains enough to expose the filter after about a month of no use
 
The MK3 cover does not change the leak route within the oil pump, it can leak between the feed side of the pump to the return side via the gear shafts and then into the sump. So your MK3 cover may not be the source of the wet sumping, the cure for the pump is O or X rings on the gear shafts.

When I copied the AMR pump mod I substituted the equivalent X ring for the O ring they use. That doubles the sealing lips.

MK3 timing cover
 
Hmmmmm ok
Maybe I'll just leave it as is
I had an Rgm inline anti wet sump valve fitted for over 20 years with no issues at all
But I got panicked into removing it just incase
I had thought the MK3 cover would stop it from sumping completely
But as pointed out above,if it's the oil pump it'll still let by
 
We have a MKIII and a Combat engine fitted with the a MKIII timing cover.
We also have two Dominator 650SS’s.

All four engines were fitted with brand new oil pumps within the last three years.

The Commando engines wet sump in three weeks
The Dommie engines wet sump in two weeks.

So you could conclude that the MKIII timing cover improves the speed of wet sumping by 50%.
 
I've looked into this situation several times. In the majority of times I find a little grit caught between the steel piston and the soft aluminum cover. Of course the oil pressure can hydraulically push the piston back to open the passage but either the grit or now scored aluminum prevents the piston's return . wet sump occurs.
I would expect the larger clearance of the ball bearing in the AMR would prevent this as long as it seals against a properly prepared oil pump nipple and using a ORING to seal against the cover.
Internal oil pump leakage is reduce with cross cavity sealing shown by Kommando.
 
baz said:
I had an Rgm inline anti wet sump valve fitted for over 20 years with no issues at all
Click to expand...

I am at 30 years with no issues, there are a couple of wrinkles to minimise the risk.

On first startup every day remove the seat and oil cap, make sure that the oil is returning by waiting for the sump to clear and then enough additional time for fresh oil to be returning to the tank.

When ever you disturb the oil line or change the oil etc prime the feed pipe so the pump sucks on oil not air.
 
baz said:
Hmmmmm ok
Maybe I'll just leave it as is
I had an Rgm inline anti wet sump valve fitted for over 20 years with no issues at all
But I got panicked into removing it just incase
I had thought the MK3 cover would stop it from sumping completely
But as pointed out above,if it's the oil pump it'll still let by
Click to expand...

I recently replaced the RGM wet sump valve fitted for 12 years for the same reason, "in case".
This is what I replaced it with from Feked in GB. Ignition interlink valve. No original herringbone
oil lines were injured:eek:
IMG_2472.JPG
 
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