Author Topic: Oil tap recommendations?  (Read 957 times)

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Phil C

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Oil tap recommendations?
« on: 16 August, 2021, 18:36:28 »
I have an oil tap below my oil tank (1965 B40F) to stop wet sumping. But it seeps oil at the joints. I've tried to sort it, smeared sealant on the olives, even renewed the tap ( with an identical type.) Can anyone recommend a leak-proof one please?   Phil

JOHNSTONE

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Re: Oil tap recommendations?
« Reply #1 on: 16 August, 2021, 20:18:07 »
Have you tried PTFE tape.

Regards Rich.

Phil C

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Re: Oil tap recommendations?
« Reply #2 on: 16 August, 2021, 20:34:03 »
Yes

Phil C

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Re: Oil tap recommendations?
« Reply #3 on: 16 August, 2021, 21:33:10 »
Or did I? Maybe I was thinking of it but then thought it might be a bit risky in that the PTFE tape might get into the oilways and cause a blockage somewhere.  Phil

chaz

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Re: Oil tap recommendations?
« Reply #4 on: 17 August, 2021, 07:27:29 »
our B40 has a leak from the tapered joint at the bottom of the oil tank connector, just one of those annoying things, poor design.
best type would be a plain threaded connector no olives, no tapered fittings. same as fuel tap design, 1/4BSP to 1/4BSP.

Phil C

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Re: Oil tap recommendations?
« Reply #5 on: 17 August, 2021, 08:51:48 »
Should I wind some PTFE tape round the olives?

Mike Farmer

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Re: Oil tap recommendations?
« Reply #6 on: 17 August, 2021, 09:15:14 »
 :) :) :)
I believe you can get a PTFE spray. Block the pipes, spray the whole joint, take out the pipe blocks, do it up agen. Should work

Mike 8) 8) 8) 8)

Phil C

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Re: Oil tap recommendations?
« Reply #7 on: 17 August, 2021, 09:29:35 »
Thanks Mike. Just had a look online at the wd40 version, which is available at Screwfix. The blurb talks about lubrication and protection but doesn't mention sealing joints. Any thoughts on that, Mike or anyone, please?  (I just don't want to buy it and find it doesn't work!).

And is it better than the tape (which I already have)?

 Phil
« Last Edit: 17 August, 2021, 09:31:13 by Phil C »

DAVE BRADY

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Re: Oil tap recommendations?
« Reply #8 on: 17 August, 2021, 09:33:11 »
Hi Phil,

If you must have a tap then make sure it has the same ID as the specified oil pipe.  I think  the B40 has 5/16 ID rather than 1/4.  Olives do not need PTFE and using it may prevent the olives from doing their job.  Some are brass and take quite bit of compressing, copper olives are easier to compress.  If you use PTFE as a 'belt and braces' back up wrap some on the thread and a bit around the pipe so that as you tighten the nut it seals the thread and where the pipe comes through the nut.
With the PTFE tape you know you have got some where you want it.

Dave.

Mike Farmer

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Re: Oil tap recommendations?
« Reply #9 on: 17 August, 2021, 13:19:43 »
 :) :) :) :)

Sorry no idea. I only know of its use in water applications and I've never used it

Mike 8) 8) 8)

Phil C

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Re: Oil tap recommendations?
« Reply #10 on: 18 August, 2021, 09:36:34 »
Mine have been copper olives, but I notice that when I've -  out of desperation - tightened too hard, they have been damaged. But anyway before then the weep of oil was there. I'm not sure I understand how PTFE would work in places other than the olive? I guess if the oil gets past the olive then tape on the thread might prevent it migrating along the thread. But tape on the pipe, unless it was pushed up against the olive? I don't quite get that. If there is enough clearance for the nut to slide along the pipe up to the thread then surely there's enough clearance for oil to get through. If it's a kind of interference fit whereby the nut deforms the tape as it slides up to the thread then is it not going to push against the olive, potentially compromising the olive seal? Overall it's annoying that this (ball-valve) tap just doesn't seem to be oiltight.   Phil

JulianS

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Re: Oil tap recommendations?
« Reply #11 on: 18 August, 2021, 11:44:46 »
If it leaks from new maybe you have a faulty tap so why not speak to the supplier about it.

You could consider lapping the olive to its mating surface.

Or, if you have space, you could consider one of these anti wet sumping valves. Some owners like them others do not. I used a similar valve on my A10 for a while until I sorted the root cause of the wet sumping.

 https://www.ebay.co.uk/itm/393486675614?hash=item5b9da22e9e:g:~eMAAMXQU6tQ~u0Y

Phil C

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Re: Oil tap recommendations?
« Reply #12 on: 18 August, 2021, 12:06:03 »
Thanks Julian. I think I'll try my existing tap once more (I've ordered some new copper olives) and then if it doesn't work I'll get one of the ones you suggest.

Two further questions:
1. How do I do the lapping you advise? A bit of fine grinding paste and just rotate by hand for a minute or two before cleaning well?
2. Regarding the one you kindly sent me a link for, if the ball and spring were to fail at some stage in the future, would that mean it would wet sump, or would the oil system be blocked (which of course would be disastrous)? I assume it would just wet sump?
Thanks again and everyone. Any further thoughts obviously appreciated.

Phil

JulianS

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Re: Oil tap recommendations?
« Reply #13 on: 18 August, 2021, 13:09:23 »
With a petrol pipe joint with an olive type connection I just rotate and press the mating parts together to ease off any posible small irreguarities on the surfaces. It does not take much to stop such a joint sealing.

I used the anti wet sumping valve for a year or so and had no issues with it.

Phil C

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Re: Oil tap recommendations?
« Reply #14 on: 18 August, 2021, 13:41:42 »
Thanks Julian.

Another possible source of the weeping I guess is the part that goes into the oil tank fitting (see photo.)
Looks okay but who knows.

Phil