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Mystery of the seals - AMC150

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Mystery of the seals - AMC150

Post  keith livingstone on Sat Jul 07, 2018 12:22 pm

Hi Guys 
Usual challenge, cobble together one good engine out of the bits of 2 or 3 dead ones! Rebuilding an AMC 150cc engine and grateful of any help / advice just to make sure I'm doing things correctly in relation to crankcase seals.

Standard Villier's practice I believe is always to have the garter side of the seal on the inside.  See pictures below of my finished c/case?  I've found from the AMC150 crankcases I have, seals fitted in either orientation, one even had two seal fitted back to back. If in doubt!

One further guide.  As these seals are the same diameter as the needle roller housing I used the bearing to push home the seal.  Is this satisfactory or should there be more of a space between the seal and the bearing?  There were no marks in the bore to indicate seal position.

Any advice much appreciated
Best wishes
Keith      

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keith livingstone

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Re: Mystery of the seals - AMC150

Post  paulfb96 on Sat Jul 07, 2018 1:38 pm

Hi Keith
2 seals on the mag side is correct, though Villiers Services now list 1 modern seal to replace the original 2. Item 27 on the drawing if I’ve managed to attach it.
Paul



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AMC 150 seals

Post  keith livingstone on Mon Jul 09, 2018 1:02 pm

Hello Paul,
Thanks for your helpful reply and the exploded view.  My copy wasn't as clear and it's not obvious.  We'll get new seal fitted and give it a go. 

Best wishes
Keith
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Bearing fitting

Post  FBKev on Mon Jul 09, 2018 4:14 pm

I Stand to be corrected. But on your picture of the crankcase it appears that the seal is fitted before (on the inside) the bearing? If that is so the bearing will get no lubrication by the petroil mix, the parts diagram provided by the Paulfb9 shows the seals on the outside of the bearing.
Kev.
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AMC 150 seals

Post  keith livingstone on Fri Jul 13, 2018 11:43 pm

Hello Kev 

Thank for that.
It's deceiving and a deep bore, but the needle roller is behind the seal 
so all should be OK.
Keith
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Re: Mystery of the seals - AMC150

Post  FBKev on Sat Jul 14, 2018 7:19 am

keith livingstone wrote:Hello Kev 

Thank for that.
It's deceiving and a deep bore, but the needle roller is behind the seal 
so all should be OK.
Keith
That's good, Couldn't quite see in the photo. And who hasn't made a silly mistake during a rebuild at some point? Embarassed Embarassed I can hold my hand up to that one.
Kev.
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Re: Mystery of the seals - AMC150

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