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Post by goandy on Jun 7, 2012 6:52:45 GMT -5
Steve and I down here are rebuilding our proper units at the same time. The only stumbling block now is the rubber o rings that fit inside the oil control rings either side of the Rotors.
We simply can't find a compatible size- 121.5ish mm inside diameter, 0.070 inch thick viton/rubber o ring. We'd prefer to make them out of viton as it has a higher temp rating than plain butyl rubber (I think the originals aren't plain rubber anyway- Mazda ones appear to be silicone). We now have the Viton cord but no means to permanently join it- superglue is the norm but no good for the oil rings as the glue forms a hard bond which breaks down just above 100 celcius.
The best way is vulcanising and to do that you need the proper viton vulcanising primer/fluid/spray/compound or whatever you'd like to call it.
Anyone in Australia know of any of the fluid or someone that can vulcanise Viton? I'm still asking around Perth- you'd think with the massive mining industry here someone would be able to do it....
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Post by raychappo on Jun 7, 2012 9:03:31 GMT -5
We joint a similar type of cord that is used for conveyor drives called PolyCord (although much thicker than the o-ring you are trying to join). We use a device like a flat bladed soldering iron, that melts each end of the cord then brings the ends together, fusing them. This provides a strong joint. there is a slight burr where the joint is made but can be trimmed off. I'm not sure whether it would work for your particular type of cord but its worth giving it a try. See this video
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Post by HGH 770N on Jun 7, 2012 10:50:27 GMT -5
Good tool Ray , I have just tried a flat bladed soldering gun and using 2 mini bull dog clips on some small blue Viton seals and it glued them togeather , I am not sure about trimming the over melt off the seals though . Good look Rog
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t140v
3rd Gear
Posts: 422
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Post by t140v on Jun 7, 2012 17:29:54 GMT -5
Morning Andy, try these if they are still in buisness, looks like they supplied viton jointing materials. Regards Stuart. www.pelseal.com/
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Post by kettle738 on Jun 8, 2012 3:53:34 GMT -5
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Post by kettle738 on Jun 8, 2012 3:57:51 GMT -5
I should have added, if that particular O ring is the wrong material it may be worth asking if they can supply exactly what you want...I have found them to be very helpful.
Mick.......kettle738
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Post by re5norway on Jun 8, 2012 8:51:33 GMT -5
I have rebuilt several proper units, and I have been using a standard dimension Viton O-ring from a local machinery shop. The dimension I have been using is 120.37x 1.78, which is listed in their catalog.
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Post by raychappo on Jun 8, 2012 9:07:28 GMT -5
Does anyone out there with experience of rebuilding want to have a go at rebuilding one of my proper units? I was going to give it a go myself but if someone can do it I'm sure they'd do a better job than me.
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Post by goandy on Jun 8, 2012 20:24:11 GMT -5
Wow. What an awesome set of replies, thanks to everyone. Re5Norway, I haven't seen those o rings anywhere here- I'll try again and Mick, thanks, I'll also try those guys. 2mm I think is too fat. Perfect for the water coollant seals but not the oil control o rings.
Stuart, those guys will sell me a small amount of the joining compound but want 2-300 bucks shipping as it is a hazardous good!
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Post by goandy on Jun 8, 2012 22:22:48 GMT -5
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Post by kettle738 on Jun 9, 2012 1:08:26 GMT -5
That's a brilliant site with all sorts of possible uses.....thanks for passing it on.
Mick.........kettle738.
(I guess O rings are made in standard sizes then.......)
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Post by ziggystardust on Jun 9, 2012 4:25:15 GMT -5
Good work guys, plenty of information on the net regarding 'O' rings. www.marcorubber.com/sizingchart.htmRE5Norway seems to have achieved positive results with his rebuilt units, maybe you could share a little more information on rebuilding for all to see? Z
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Post by re5norway on Jun 9, 2012 5:53:18 GMT -5
For a unit rebuild I use the following stock listed Viton o-rings: 2x 1.78mm x 120.37mm for the rotor side seals 8x 1.6mm x 13.1mm for the side housings
For sealing of the side housings I order custom made glued Viton seals: 2x 282mm x 2.0mm for the outer groves 2x 224mm x 2.00mm for the inner groves
The point where the rings are glued, is to be placed at the coldest point of the housing, which are in the middle of the inlet port.
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Post by goandy on Jun 9, 2012 21:50:20 GMT -5
I'll add all this into my proper unit rebuild thread as well.
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t140v
3rd Gear
Posts: 422
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Post by t140v on Jun 19, 2012 16:54:35 GMT -5
Hi Andy, have been in touch with customer support at Locktite who make jointing compounds and super glue, answer below:-
Stuart,
Viton has a low surface energy so needs a primer before bonding. Loctite 770 primer with Loctite 406 adhesive is our best option in the industrial market.
If you only have a couple to do, use Loctite Superglue "All Plastics" kit. The primer is supplied in a small felt tip pen, and the glue is in a small 2g tube. This is available through B&Q etc.
Best regards
Peter Martin-Flaven Application Engineer
Henkel Limited Wood Lane End, Hemel Hempstead, Hertfordshire. HP2 4RQ peter.martin-flaven@uk.henkel.com
another route if you need it.
Regards Stuart.
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