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Post by wasteman on Jul 13, 2006 19:12:07 GMT
Hi,
New member here needing urgent help with a Oil Leak.
I have just aquired a 4 month old Baotian BT50QT-9, which I obtained at a very good price because it had a oil leak.
Oil was leaking/dripping from the rear of the main engine casing, at first I thought it may have been the gear oil sump plug not tightened, but that's OK and the oil is definately engine oil.
The scoot , on a quick test ride, was reving well, but not picking up speed.
Took the enging cover off, (the bit where the drive belt is) and found it totally soaked in oil, including the belt, (hence little acceleration). Can not see where the oil is coming from. Will need to try and dry everything out and then see if I can see the fault.
Has anyone else had this problem?, is there an oil seal, between the engine and drive system that could have gone?
All replies gratefully received.
Geoff
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Post by cb50j on Jul 13, 2006 19:51:57 GMT
haven't heard of this kind of problem,
could possibly be crankcase gasket???
........ C
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Post by ally1756 on Jul 13, 2006 22:08:52 GMT
there is a seal yes, dont know how to acess it though sounds like it needs a rebuild to me
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Post by wasteman on Jul 15, 2006 7:48:49 GMT
An update - Just in case someone else has the same problem in the future.
There is an oil seal between the engine, (on the crankshaft) and the drive system, this is the one which has gone.
A mechanic who knows these engines has told me how to fix/replace it. Not a massive job, just time consuming, you dont have to strip the whole engine, and the seal is only a couple of pounds.
Will give it a go this weekend, time permitting.
Thanks to the two above for your replies.
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Post by cb50j on Jul 15, 2006 8:00:53 GMT
#thumbs_up#
take some pics if you can, would be useful for future reference
............. C
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Post by Badobsession (the real one) on Jul 15, 2006 21:11:08 GMT
Should be able to hook the seal out with a small screwdriver but be careful not to damage the alloy surface on the crankcase.
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Post by wasteman on Jul 21, 2006 16:57:09 GMT
Second update.
After obtaining an impact wrench, I was able to remove the variator nut and strip out the belt and bit where the rollers go.
May I thank others for already posting in other threads, on this forum, for pointing out the need for the impact wrench, and also posting pictures of what it looks like inside of this part of the bike – a great help.
Once inside, I found the offending oil seal had ‘popped’ out of it’s housing and was lying there. On examination, it did not appear to be damaged in anyway, no nicks, marks or distortion.
So, taking a chance, I refitted the seal in it’s housing, tapping it home with an old, long reach socket of the right diameter. Re-built everything I had taken out, and fingers crossed, started the engine, run it for a couple of minutes – NO LEAK - problem sorted – I thought.
Just to check, I needed to take a test ride, but before then, I needed to replenish the oil, which had been lost through the ‘missing’ oil seal hole.
On unscrewing the dipstick, I hit the next problem, a ‘hissing’ sound emerged from the oil filler, and oil started to spurt out – obviously a massive pressure in the engine – but how and why?
To cut a long story short, the how and why took me two days of checking everything I could see, smell, touch and adjust in and around the engine, including 2 complete oil changes.
I stumbled across the problem when looking at the carburettor drain/breather pipe and the cylinder head breather pipe – they had been joined together!!!
I can only assume the previous owner had, in his wisdom, not liked seeing a pipe dangling and had thought this must go somewhere and linked them. Once ‘un-joined’ and routed correctly, the bike runs perfectly (for now) without oil leaks or loss.
As a point to watch, the engine breather pipe, which runs at the top of the engine, and under the seat box, could I imagine, get ‘kinked’ or squashed by the said seat box, if you are not careful, when replacing it after some engine maintenance.
I am beginning to think owning a Baotian scooter is like signing up to an automotive night school class at college, without the certificate at the end!
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Post by ally1756 on Jul 21, 2006 17:00:40 GMT
lol glad to hear you've sorted it! cant beleive they joined the rbeathers lol
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Post by cyberconte on Jul 21, 2006 17:53:35 GMT
I am beginning to think owning a Baotian scooter is like signing up to an automotive night school class at college, without the certificate at the end! Thats partly why i got mine  They're simple enough that you can still learn, and they're cheap enough so that if you screw up, you're not looking at a gargantuan mechanic bill (not to mention the tow money you save by throwing it in a pickup if/when you break down!)
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blubayou
Forum Master
Blew By You!
Posts: 108
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Post by blubayou on Jul 21, 2006 22:31:53 GMT
Wasteman,
No certificate but have a karma for good logical faultfinding, well done!
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Post by Scootin on Jul 25, 2006 13:22:17 GMT
I am beginning to think owning a Baotian scooter is like signing up to an automotive night school class at college, without the certificate at the end! That is about it. I feel the same way, I have learned a lot about scooter engines in the last 9 months. Good job & good eye on finding those problems #thumbs_up# |
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They're simple enough that you can still learn, and they're cheap enough so that if you screw up, you're not looking at a gargantuan mechanic bill (not to mention the tow money you save by throwing it in a pickup if/when you break down!)
