Joined: Aug 2022 Posts: 149 Threads: 27
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Location: Cheshire
Car type: Austin 7 RN - 1932
The front oilway blanking bolt is leaking badly again. The bolt looks perfect and the threads in crankcase look poor. Not really a surprise is it? The leak happened about 18 months ago and a new fibre washer and a very gentle turning of the bolt has held until now with regular checking.
I guess that a proper repair will involved heli-coil or similar and will be an engine out job?
Are there any sensible temporary solutions as I want to do the Staffs & Shropshire Spring run on Sunday which is about 100mile round trip? I have heard rumours of copper wire and aluminum foil, but I worry about putting "stuff" down into the oilway!!!
Advice gratefully received as always.
Joined: Aug 2017 Posts: 1,337 Threads: 34
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
Hi Dave. Am I right in thinking it’s 1/4BSP? If so you might get away with replacing the plug with a BSPT one. Crewe Engineering Supplies should have them - across the roundabout from the retail park in Crewe
Alan Fairless
Joined: Aug 2017 Posts: 1,337 Threads: 34
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
19-04-2024, 02:06 PM
(This post was last modified: 19-04-2024, 02:10 PM by Alan.)
Dave. Not the plug I was thinking of. That looks like 1/4 Whit and it’s the oil jet blanking plug.
As a temporary measure what you. Could do is wind order tape around the thread and jam. Cork between the bolt head and the cylinder block.
Alan Fairless
Joined: Aug 2022 Posts: 149 Threads: 27
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Hi Alan, Sorry my terminology is a bit lacking. Yes it the blanking plug over the oil jets.
It is BSF. We measured at CES with a thread guage. Very helpful guy
Sorry what kind of tape were you suggesting?
I do have fibre washers - will that do?
Cheers
Dave
Joined: Aug 2017 Posts: 1,337 Threads: 34
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
19-04-2024, 03:37 PM
(This post was last modified: 19-04-2024, 03:39 PM by Alan.)
Sorry it’s spellcheck that should be ptfe tape.
Fibre washers will do fine and if you have a slightly longer screw that might help too
Alan Fairless
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I made atemporary fix many years ago by bolting a clutch withdrawal lever on one of the block holding studs. This could go over the oilway plug and hold it in place. It leaked a bit but stayed in.
Jim
Joined: Aug 2022 Posts: 149 Threads: 27
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Location: Cheshire
Car type: Austin 7 RN - 1932
CES had some longer bolts - but how far can I go before causing problems below?! They also had stainless steel. I had heard of them but never been in - only 3 miles from home pf course.
I will go with the ptfe tape and fingers crossed Alan. Thanks
I like the lateral thinking Jim. One to keep up my sleeve.
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A Dowty bonded washer might well stop the leak as I suspect you are only talking 10 psi oil pressure.
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Location: Hampshire UK
Hi
You could try a Dowty Seal instead of a fibre washer, Metric M6 will fit 1/4 inch OK. For those unfamiliar, this is a thin metal washer with a bonded rubber inner part.
If you prefer to stick with fibre washers, they can be softened a bit by soaking in water. The softening allows a better seal without excess pressure being needed.
