Oil Pressure

[mark.scott]

Ah - I've had the pump off recently but can't remember seeing anything resembling a valve.

[alan.moore]

Mark..If you have a read through this post :
http://forum.arielownersmcc.com/viewt ... lve#p24338
it should explain what you have / should have

The image below shows the case you have and the valve in question is circled. As discussed earlier my understanding is that its purpose is to provide pressure in the oil gallery which feeds to the gauge (and the rockers when they are fed from the pressure side of the pump).

1941 and on Singles case

Post 1941 single case.JPG (19.67 KiB) Viewed 3908 times

[simon.holyfield]

As an aside, your 6T website looks great. I plan to read it all later!

[alan.moore]

Simon: I thank you. I intend to do one for the RH along the same lines. But as the restoration is under just getting underway it may be some time.

Mark: If you have a look at this page on the Draganfly website, under 'Timing case' it sets out whats what with the various valves and gives the part numbers:

https://www.draganfly.co.uk/index.php/a ... bottom-end

[mark.scott]

Hi I've taken the pump off (photo's attached - oil is still draining)there seems to be a threaded hole where the regulator valve should be but no spring, ball bearing or threaded cap.
Also, the stud coming out of the timing case (that Is supposed to feed the oil gauge) has a hole down the centre not along the thread so I don't understand how the oil can enter the banjo fitting and get to the gauge.
On my bike the rockers are fed (photo's attached) from the oil return with little a tap installed in the line.
Is this a later timing case or an early one that should have the external regulator? I'm a little confused about what to do. Many thanks for all the responses they're very much appreciated.Mark

[mark.scott]

Further to my last post the hole where the valve might go behind the pump doesn't seem the be threaded? Thanks again.

[alan.moore]

Mark, does this make it any clearer?

This is the earlier case:

Timing case up to 1941

This is the case you have, 1941 onwards

Timing case 1941 onwards

The pressure valve is a press fit in the hole in the case, there are no threads. It consists of a spring, a ball bearing and the seat which presses into the hole. The parts required are on the Draganfly page quoted in my previous post.

Your gauge supply stud should have a hole down the centre of the stud and two holes across the stud at the point where it is relieved. Drags can supply this, it is listed on the linked page

I am a bit confused as to your rocker feed pipe, the one with the tap / valve on it. I thought you previously said the rockers had grease nipples ?

Hopefully someone more knowledgeable will chime in but I think this pipe may be a feed for the valve guides as your photo shows it leading into a union on the top of the head.
Cheers
Alan

[alan.moore]

Re the pipe which leads to the cylinder head I found this link to previous posts:

http://forum.arielownersmcc.com/viewtopic.php?t=2477 .

http://forum.arielownersmcc.com/viewtopic.php?t=778

To me it looks like your setup is a previous owners modification to improve oiling of the valve guides, i.e turning the tap on gives them a good splash of oil. I am sure a real expert will be able to give you a better heads up on whether this setup is a good idea.

[mark.scott]

Hi Alan - Now it's becoming clearer.
I think I need to replace the gauge supply stud as it has the hole down the centre but not across the stud (as far as I can tell) so I can't work out how the oil could ever get to the gauge. I'll also order the pressure valve set up from Drags.
The guides are supplied with a pipe from the crankcase (misting ?). The rockers do have grease nipples.
The pipe I mentioned with the tap splits and enters the top of the head, as you say maybe the previous owner made his own mods to ensure plenty of lubrication?
As a thought, are pre 41 timing cases readily available? as one day I might want to revert back.
Alan: By the way your website on your 6T restoration is a real treat.
Thank you all for your time and patience. Mark

[alan.moore]

Mark
Glad to be of some help. I have had a lot of help from members of this forum and it is good when you can pass something on to others. Thanks for the kind words on the website.
Regarding timing cases I think they are out there, just a case of keeping your eyes open on Ebay and at autojumbles and snapping one up when you see it.