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Post by bezzer on Sept 22, 2018 18:39:02 GMT 1
Gents, What is the accepted practice for the installation of crank/gearbox seals into engine cases?, do any of you seal the outer circumference of the seal?.
I’m sure I’ve read a thread on here where the op put threadlock (or similar) on the outer edge of their bearings, and wondered if you should adopt a like approach to seal installation?. FWIW I have always put a light smear of grease on the inner lip to prevent the seal tearing on initial start up.
Apologies in advance if I’ve missed something obvious or if this is a complete no-no.
Regards bezzer
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Post by 4l04ever on Sept 22, 2018 18:45:31 GMT 1
I did not put any sealer on the seals, as they are rubber and should make a good seal if they are new. If you are putting grease on the inner lips of the seals, use brake grease, as it does not affect the rubber.
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Post by bezzer on Sept 22, 2018 19:09:36 GMT 1
I did not put any sealer on the seals, as they are rubber and should make a good seal if they are new. If you are putting grease on the inner lips of the seals, use brake grease, as it does not affect the rubber. Cheers Rob, Top tip mate 👍🏻, am I thinking red rubber grease is the correct stuff to use then?. |
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Post by 4l04ever on Sept 22, 2018 20:31:48 GMT 1
Yes, I use the Red Rubber grease on seals etc.
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Post by earthman on Sept 22, 2018 20:36:39 GMT 1
Isn't it so long as it's silicone based, that's the main thing to look out for rather than colour??
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Post by jon on Sept 23, 2018 9:33:08 GMT 1
Isn't it so long as it's silicone based, that's the main thing to look out for rather than colour?? I don’t think it’s silicone based. I think it’s castor oil (a vegetable oil, remember Castrol Arrgh sic). It won’t mess rubber seals etc up. It doesn’t have to be red, but I think makers such a Castrol dye it red for identification purposes. Jon |
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Post by earthman on Sept 23, 2018 10:13:43 GMT 1
Isn't it so long as it's silicone based, that's the main thing to look out for rather than colour?? I don’t think it’s silicone based. I think it’s castor oil (a vegetable oil, remember Castrol Arrgh sic). It won’t mess rubber seals etc up. It doesn’t have to be red, but I think makers such a Castrol dye it red for identification purposes. Jon I thought that I read somewhere that silicone based grease doesn't degrade or make rubber seals swell up over time, unlike some other forms of grease. |
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phil38
Thrash Merchant
Posts: 426
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Post by phil38 on Sept 23, 2018 10:16:19 GMT 1
Isn't it safer to use gearbox oil. Any grease could contaminate the gearbox oil and clutch?
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Post by earthman on Sept 23, 2018 10:20:57 GMT 1
Isn't it safer to use gearbox oil. Any grease could contaminate the gearbox oil and clutch? Good point but it's only really a smear of grease that you would be using to aid with seating/holding the seal during assembly. |
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Post by 4l04ever on Sept 23, 2018 12:06:10 GMT 1
It is worth oiling or greasing the crank seals if you are going to do a leak down test, to aid with sealing.
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Post by jon on Sept 23, 2018 12:40:13 GMT 1
In my experience red rubber grease is not really dissolved in engine oil, so shouldn’t effect the clutch etc.
I would only use a thin smear though. Engine oil is OK too.
I remember lambretta flywheel side bearings run in grease all of their life, and are isolated from the crankcase bottom lubricated by 2 stroke oil.
Jon
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