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Oil? seeping out of top of downpipe D14 - Good / Bad?
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coxy46
Nottingham
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September 3, 2019 - 6:09 pm
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Hi,

After getting all the electrics done, just pottered up and down the road. Giving it a very short test run (5 minutes), to make sure everything works. Other than a slightly stiff gear change (not quite as smooth as my R1), it all seems fine except...

When I stopped I noticed splashes of oil on the bottom of the down pipe and where it stood on my drive. Closer inspection I can see drips of the black liquid forming on the exhaust pipe adapter nut where it fixes to the engine block.

Is this something I need to worry about, will a bigger run help this or is something leaking that shouldn't be?

 

IMG_20190903_174109467-1-Small.jpgIMG_20190903_174059290-Small.jpg

 

Regards

Greg

Coxy46 (Nottingham - England)

1968 Bantam D14/4

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AdrianS
Harlaston Staffs
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September 3, 2019 - 6:16 pm
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Mine does that too.

Check the gasket is good and tighten the exhaust nut again after a run. If it still weeps then either try to seal again or leave it and it should seal itself with carbon after a few miles!

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Mick W
Chester/ North Wales Flintshire Border
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September 3, 2019 - 6:48 pm
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Once you get the bike good and warm on a run you will probably find that this will stop. 

Have a look ** Please log in to view **

Mick

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Stoo63
GLASGOW
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September 3, 2019 - 9:14 pm
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Common enough problem, Greg. hopefully a longer run will expand it all to close up. And, whilst the gearchange on your R1 may be smoother, didn't the daft so-n-sos go and put it on the wrong bleedin' side !! confusedlaugh

Good luck,

Stewart

'52 D1 direct lighting plunger, '58 Square Four (project), '59 D1 direct lighting plunger,  '59 Tiger Cub, '60 5TA,  '76 FS1-E

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cocorico
Central France
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September 4, 2019 - 8:02 am
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coxy46 said
...Is this something I need to worry about, will a bigger run help this or is something leaking that shouldn't be?
  

Just make sure you're not wearing your best jeans and boots! As the joint between the exhaust pipe and cylinder is copper, it is a good idea to tighten it, then get the engine / pipe good and hot and tighten a bit more, then repeat until you get no more movement. It will also 'coke-up' given time.

Stoo63 said
... the gearchange on your R1 may be smoother, didn't the daft so-n-sos go and put it on the wrong bleedin' side !! confusedlaugh

No, BSA got it wrong when they made the Bantam by mirroring the blueprints of the DKW 'nicked' from Germany after the war. wink roflget-me-coat

1956 D3 running, lights to sort. 7 other bikes in the Barn, 6 runners (when I get time!) and a still in progress Morini 250

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nickjaxe
Runcorn Cheshire UK
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September 4, 2019 - 7:17 pm
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There are some badly fitting downpipes that don't fit square on the cylinder...you can fit 2 gaskets together or as my pal had done with his badly fitting pipe...cut it around most of its circumference...open or close the cut to get the alignment....mig weld the cut back up when happy.

My Bantam video              https://www.you.....jpOFmzRZRI

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SpacedMarine
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September 5, 2019 - 1:11 pm
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Mine did that just wipe it and give it a good ragging :-)As Coco says nip it up again and eventually itll "coke up" I was a bit annoyed with mine when it did it as I'd just polished the pipe but its fine now.

What's 7/16 in mm again?

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SpacedMarine
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September 5, 2019 - 1:12 pm
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nickjaxe said
There are some badly fitting downpipes that don't fit square on the cylinder...you can fit 2 gaskets together or as my pal had done with his badly fitting pipe...cut it around most of its circumference...open or close the cut to get the alignment....mig weld the cut back up when happy.  

I always thought welding chrome was a bit of a H&S no no because of the fumes?Could be wrong though!Then again i dare say breathing 2 stroke fumes isnt that healthy 🙂

What's 7/16 in mm again?

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nickjaxe
Runcorn Cheshire UK
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September 5, 2019 - 5:28 pm
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SpacedMarine said

nickjaxe said
There are some badly fitting downpipes that don't fit square on the cylinder...you can fit 2 gaskets together or as my pal had done with his badly fitting pipe...cut it around most of its circumference...open or close the cut to get the alignment....mig weld the cut back up when happy.  

I always thought welding chrome was a bit of a H&S no no because of the fumes?Could be wrong though!Then again i dare say breathing 2 stroke fumes isnt that healthy 🙂  

I should have added...grind back to the base metal to get a good weld...do the cut near the flange and the weld is hidden by the large securing ring.

Works a treat.

My Bantam video              https://www.you.....jpOFmzRZRI

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