David, what you say about PTFE in the fuel tank makes sense, But Goffy's NORBSA website seems to indicate it is O.K. on threads. It seems to work for me, anyhow.
Fuel Tap Leak
- Thread starter cinquecento
- Start date
I always check to make sure the product is current, but distribution is another thing. I am surprised that the need in the UK is not just as great for these products. The EZ Turn grease was developed for the military by United Erie and it used to be you had to ask someone in the Service for some. It has been available to civilians for quite a while primarily through aircraft suppliers. It does beg the question, "What do UK aircraft mechanics use?" The EZ Turn grease is something that is worth pursuing. I bought the 1 lb. tin, took a table spoon, which is probably a life time supply, and gave the can to an S.O. for distribution to others. It is soap based and works as a lubricant and a thread sealer. Maybe someone coming to the U.S. can get a can back to the UK? Aircraft Spruce has a distributor in Canada also if that is of help.
David
http://www.loctite.com.au/3374_AUS_HTML.htm
I have added the link above the Loctite product 565 which as stated in the tech spec is fuel proof. I am not sure if it will help in this particular application but I have used it on all threaded parts carrying fuel on my road racing sidecar for many years with no leaks. I was originally told to use it by the Loctite rep who used to visit work..
I have added the link above the Loctite product 565 which as stated in the tech spec is fuel proof. I am not sure if it will help in this particular application but I have used it on all threaded parts carrying fuel on my road racing sidecar for many years with no leaks. I was originally told to use it by the Loctite rep who used to visit work..
replacement flow stem is on order, if the damage is more deep set ie to the tap body I may give this /\/\ a go.
Thanks
Thanks
For many years every winter I have lapped in my petrol taps with Autosol mettle polish.
The taps are the tapered brass type with a corrugated spring below the lever to ensure engagement of the
tapered brass plug into the brass body. All held together with an internal circlip.
I used to knock the pin out that retained the lever, remove the circlip and lap the tapered plug into the body
of the tap with a small electric drill and a spot of Autosol cleaning thoroughly after before reassembly.
The taps were petrol tight for about a year before they needed another regrind.
A couple of years ago I turned a small groove in the outer (larger) end of the tapered plugs and fitted small
O rings in them which has stopped external leakage from the taps. However I have found that the groove has to be
dead true to the valve stem and of precise depth otherwise the O ring will hold off the tapered plug against
its engagement spring and petrol will leek to the carburettor. Get it right and it works a treat.
No more grinding (I hope !)
The taps are the tapered brass type with a corrugated spring below the lever to ensure engagement of the
tapered brass plug into the brass body. All held together with an internal circlip.
I used to knock the pin out that retained the lever, remove the circlip and lap the tapered plug into the body
of the tap with a small electric drill and a spot of Autosol cleaning thoroughly after before reassembly.
The taps were petrol tight for about a year before they needed another regrind.
A couple of years ago I turned a small groove in the outer (larger) end of the tapered plugs and fitted small
O rings in them which has stopped external leakage from the taps. However I have found that the groove has to be
dead true to the valve stem and of precise depth otherwise the O ring will hold off the tapered plug against
its engagement spring and petrol will leek to the carburettor. Get it right and it works a treat.
No more grinding (I hope !)
I just ordered a "United EZ Turn Fuelube - 5 oz tube" from a company in the U.S. called Sky Geek, www.SkyGeek.com
They send internationally by mail order. Price: $8.60 + postage $15.25 to Norway. Payment with credit card or PayPal
They send internationally by mail order. Price: $8.60 + postage $15.25 to Norway. Payment with credit card or PayPal
I made my own fuel taps about 10 years ago using homemade PTFE seals clamped onto a parallel cock, the taps mimicking the outside appearance of a normal taper cock tap. Petrol hasn't affected the PTFE in all that time.
Paul.
Paul.