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sam christie
United Kingdom
3101 Posts |
 Posted - 08/11/2014 : 17:05:32
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I am looking for a brass plug to complete a J2 inlet manifold like the plug in the middle of the example below. Not the most complex item on the engine but it would be pleasing to find the right one.
Sam |
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Cymber
United Kingdom
966 Posts |
Posted - 08/11/2014 : 19:40:11
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Sam,
What thread is it? I may just have one.
Maurice Blakey |
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sam christie
United Kingdom
3101 Posts |
Posted - 09/11/2014 : 13:37:43
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Thanks Maurice.
I confess I don't know what the thread is. The inlet manifold will probably arrive with me in the next week or so but I doubt if I will be able to positively identify the thread. Could it be 3/8 BSP?
Can anyone tell me the thread or identify another location on, say, a P-type which uses the same thread?
Sam |
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Bob Stringfield
United Kingdom
854 Posts |
Posted - 09/11/2014 : 16:18:26
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There is what appears to be a similar-sized plug on the front face of the PB engine's inlet manifold illustrated in the 'For Sale' thread.
Bob. |
Edited by - Bob Stringfield on 09/11/2014 16:19:26 |
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sam christie
United Kingdom
3101 Posts |
Posted - 11/11/2014 : 14:10:15
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I understand from the Internet that BSP threads can be identified by measuring the outside diameter of the threads in inches and subtracting 1/4" . By this method the thread appears to be 3/4" BSP.
Sam |
Edited by - sam christie on 16/11/2014 10:34:54 |
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g waiting
United Kingdom
729 Posts |
Posted - 11/11/2014 : 17:09:47
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Hi Sam,
Same as a sump plug, I've got one surplus to requirements.
Garry |
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DickMorbey
United Kingdom
3677 Posts |
Posted - 11/11/2014 : 21:13:13
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While we are on the subject of threaded plugs, does anyone have a spare P type gearbox plug (filler or drain)?
TIA
Dick Morbey
PA/PB 0743
Frieth, Oxon, UK |
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Peter Green
United Kingdom
1682 Posts |
Posted - 11/11/2014 : 22:29:59
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Dick,
I am sure I can find one for you.
Peter |
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LewPalmer
USA
3244 Posts |
Posted - 12/11/2014 : 03:20:47
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Dick, If Peter can't, I have a couple in the parts drawer. It seems like a really weird thread form. As I measure it, it is 24.78 mm X 1.0. Sort of a 1" diameter with a 1 mm thread pitch. (???) It can't be BSP, as that has a much coarser thread pitch.
Lew Palmer
PA1169, PB0560 |
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Nick Feakes
USA
3376 Posts |
Posted - 12/11/2014 : 12:32:02
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Given that it is in aluminium, wouldn't it be Whitworth? Of course it might show the origins of the engine and be metric.
Nick |
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Peter Green
United Kingdom
1682 Posts |
Posted - 12/11/2014 : 15:27:59
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The gearbox filler and drain plug thread is 3/4" BSP (14TPI)
Dick, I have checked and I do have a spare drain/filler plug.
Peter. |
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LewPalmer
USA
3244 Posts |
Posted - 12/11/2014 : 22:32:46
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So what is it that I have here????
Lew Palmer
PA1169, PB0560 |
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DickMorbey
United Kingdom
3677 Posts |
Posted - 13/11/2014 : 07:25:05
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That looks like what I was looking for, Lew, thanks. However closer to home, Peter has found one in his spares den!
Dick Morbey
PA/PB 0743
Frieth, Oxon, UK |
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LewPalmer
USA
3244 Posts |
Posted - 13/11/2014 : 15:14:44
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But what I have is clearly not a thread pitch of 14 TPI, but close to 25.4 TPI. The PA and PB are put to bed for the winter, so I can't easily try them on a gearbox. Anyone know?
Lew Palmer
PA1169, PB0560 |
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LewPalmer
USA
3244 Posts |
Posted - 13/11/2014 : 15:41:38
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I should know better than to question Peter Green. Curiosity got the better of me, so I crawled into the PA and removed the gearbox filler plug and discovered that Peter was absolutely correct. The filler plug is a 14 TPI thread pitch, not what I found in the parts drawer. I have no idea what my plugs are from. On the left is the correct gearbox plug and on the right is my mystery plug.
Lew Palmer
PA1169, PB0560 |
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sam christie
United Kingdom
3101 Posts |
Posted - 16/11/2014 : 10:27:34
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I seem to have lost this thread somewhere.
I have just discovered that the plug does not appear to be 3/4" BSP. Thanks to a suggestion by Jack Gardner I called into a local plumbers merchants and a selection of brass plugs of 3/4" BSP was soon produced - one looked exactly right- but none fitted. The assistant suggested I could try a taper thread and another plug (steel this time) was produced but it did not take the thread either.
I cannot see any problem but there could be something wrong with the way my inlet manifold has been threaded (it is an old but unused reproduction of unknown origin) but it seems more likely that I have not identified the thread correctly. What could it be?
As you can see below an M-type sump plug is smaller and has a finer thread.
Sam |
Edited by - sam christie on 16/11/2014 10:39:49 |
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