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Anyone seen mis-machined 200 casings....

Posted: Tue May 11, 2010 8:44 pm
by drunkmunkey6969
Seen this a couple of times now, and wondered if anyone had seen anything similar:

Scooter comes in, wont tickover, smoking, spitting black shite out of exhaust.....i suggest oil seals need looking at. Strip down, pool of black oil in exhaust pipe and in crankcase mouth. Remove the 4 reccessed head screws, fit new seal, and go to refit plate....and notice that the 4 machined stud holes in the casing, dont match the 4 reccessed holes in the uprated oil seal plate. Match up 1 hole, and teh other 3 dont line up properly.

You can try to line up the plate as best possible, but on one occasion, as you tighten up the 4 screws....to a ceratin degree they are 'self centering' and they drag the plate out of line...so that the oil seal doesnt sit 100% inline with the bearing etc.

Anyone else seen this?

Re: Anyone seen mis-machined 200 casings....

Posted: Tue May 11, 2010 9:00 pm
by Ian Hepworth
Broady mentioned it recently, can't remember what his solution was.

Re: Anyone seen mis-machined 200 casings....

Posted: Tue May 11, 2010 9:20 pm
by TS1-200
might be a stupid question to somebody that knows Lambrettas inside out, but have you tried an original oil seal retaining plate ? just a thought.

Re: Anyone seen mis-machined 200 casings....

Posted: Tue May 11, 2010 9:22 pm
by Speed Demon
Heard of this as a relatively common problem with recent (last 3-4 years) Indian casings.

Re: Anyone seen mis-machined 200 casings....

Posted: Wed May 12, 2010 12:39 am
by Knowledge
Can you not rotate the oil seal retaining plate by 45 degrees, and drill and tap new holes?

Re: Anyone seen mis-machined 200 casings....

Posted: Wed May 12, 2010 9:01 am
by RinB
Knowledge wrote:Can you not rotate the oil seal retaining plate by 45 degrees, and drill and tap new holes?

Thats exactly what Ive done on a couple of cases :D
Its easiest way to fix

Re: Anyone seen mis-machined 200 casings....

Posted: Wed May 12, 2010 10:41 am
by drunkmunkey6969
Ahh...so it is quite common. Typical indian shite engineering!

Yes, you can drill new holes etc....but its such an arse when you have a customers scooter in bits on the bench, thinking its a simple oil seal replacement, and then next thing you're faffing with drilling/tapping etc....pain in the arse.

Re: Anyone seen mis-machined 200 casings....

Posted: Wed May 12, 2010 11:44 am
by soullad
Whenever I know I'm reusing a steel retaining plate on a rebuild I dot punch the plate / surrounding so that it goes back in the exact way it came out.

Re: Anyone seen mis-machined 200 casings....

Posted: Wed May 12, 2010 11:58 am
by RinB
soullad wrote:Whenever I know I'm reusing a steel retaining plate on a rebuild I dot punch the plate / surrounding so that it goes back in the exact way it came out.

Thats a good idea as well :)

Re: Anyone seen mis-machined 200 casings....

Posted: Wed May 12, 2010 1:21 pm
by carlos fandango
Knowledge wrote:Can you not rotate the oil seal retaining plate by 45 degrees, and drill and tap new holes?
Wouldn`t this cause you to break through the casing to the sprocket side ? as where the screws go the casting is thickened up to allow for them.