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Shaft |
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Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
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Posted: 23:30 - 13 May 2019 Post subject: 2 smoke crankcase sealant |
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Might have a chance of picking up a classic 2 smoke single for a sensible price.
It's had a lot of work done and looks the part (only seen pictures so far) but the owner made a schoolboy error and forgot to seal the crankcases when he put it together, hence it leaks gearbox oil into the cylinder.
In my day it was whatever came in a tube, but things have moved on, so does anybody have a clue as to what's the modern day recommendation for sealing compound?
TIA ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 23:37 - 13 May 2019 Post subject: |
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I use permatext copper spray gasket, but it takes a good bit of masking. Never failed me though.
In your position I'd two two things:
1. Check each half on a flat plate to make sure there is not even the tiniest burr on the mating edges. Happens a lot where people lever the cases apart.
2. Get some yamabond (or equivalent) and apply it with an artist's brush. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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MarJay |
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MarJay But it's British!
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A100man |
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A100man World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
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Shaft |
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Shaft World Chat Champion
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stevo as b4 |
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stevo as b4 World Chat Champion
Joined: 17 Jul 2003 Karma :
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Posted: 18:02 - 14 May 2019 Post subject: |
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When you strip it, I'd check everything and stuff like the integrity of the crankcase mating faces, that the bearings are all fully seated, and the oil seals are fitted the right way round and not damaged. All that sort of stuff and crankshaft end float etc can all be checked when you strip the engine down to sort the leak. You might have a hairline cracked crankcase or warped mating faces etc.
As for sealant I too used Threebond stuff when re-assembimg my KMX engine. But I think Permatex, Well seal, high temp instant gasket or blue Holomar are all good for sealing joints as long as it's kept out of oil ways (which is were the bad rep comes from).
Whatever you do, don't go onto a certain Yamaha forum as they really are anal about this stuff. Your probably aware that Threebond is just a brand, and they must do at least 6-8types and specs of sealant. I used 1207, but theres loads and they obsess over which ones are for different temperature limits, which are oil resistant and which can be immersed in petrol etc, and how long the shelf life is. Also they'll discuss how and were to apply it, when you should do a leak down test and how long for at what pressure.
Maybe I've no sense, but I've stopped looking at these forums as if you listened, considered and debated everything they all say, you never decide on what to do or get anything done.
As an example, I've always fitted cylinder Base gaskets dry, but listening to that bunch of old women made me smear sealant on both sides of my gaskets, as im not planning on doing a leak down test because I don't have the kit anyway. |
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 18:27 - 14 May 2019 Post subject: |
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If you're gonna strip it down anyway bring the halves round to mine and I'll blue them up on my big surface plate. I can check the flatness of the mating faces to within 0.005mm ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Shaft |
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Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
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Posted: 19:40 - 14 May 2019 Post subject: |
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Ta for all your help folks.
Stevo, that's exactly what I was thinking when I started this. In my day, there was blue or red Hylomar, red was for permanently gluing stuff together, blue was for everything else.
Just looking at the range of stuff we have at work, there seems to be a gunk for every occasion!
Pete, thanks for the kind offer, but I'm hoping not to get to a totally bare case situation.
To be completely honest, I have no interest in this bike, other than to make money - the information was passed to me and, having weighed everything up, it seems almost too good to be true.
Assuming it gets into my hands, the plan is to strip the motor to the minimum I need to seal the cases (I want to leave the gearbox internals in place and everything) check it as far as I can with a straight edge and MK1 eyeball, then chuck it back together and flip it. ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Shaft |
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Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
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Posted: 22:26 - 15 May 2019 Post subject: |
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A100man wrote: | Hi Sorry I just re-read the OP. So he admitted to not sealing the cases?
Does make you suspect other work that's been done in that case.
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It's better than that, he then split the cases again, just enough to put some sealant around the perimeter, forgetting there's an internal seam between the gearbox and the cylinder, so now he's made it worse, because there's an extra gap the width of however much sealant he put in there.
Does make me very suspicious, but it's not far away and I'm going for a look see at the weekend, with my eyes wide open. ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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Posted: 23:21 - 15 May 2019 Post subject: |
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Loctite make a the bestest sealants.
They cure in the absess of oxygen.
Two gasket makers are one sets like a hard glassy plastic, the other sets like a more pliable plastic.
They stick lime shite to a blanket and if the surface is prepared correctly the seal is permanent.
Permeated is a silicon product. I don't think it's as good in pressure jobs.
https://www.henkel-adhesives.com/uk/en/products/industrial-sealants/liquid-gasket-solutions.html ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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Shaft |
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Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
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Posted: 13:59 - 18 May 2019 Post subject: |
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Shaft wrote: | A100man wrote: | Hi Sorry I just re-read the OP. So he admitted to not sealing the cases?
Does make you suspect other work that's been done in that case.
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Does make me very suspicious, but it's not far away and I'm going for a look see at the weekend, with my eyes wide open. |
Just to close this thread, I went and looked and, to quote a trailer for a well known antique restoration programme, it was repaired by an oaf, at night, with his feet!
Very odd, he had obviously spent a lot of time (and money probably) restoring or replacing almost everything, then given it to a toddler to throw it together.
Everywhere I looked, something was skew-whiff, badly routed or fastened with mismatched nuts and bolts, some of which weren't done up properly.
It really needed completely stripping and putting back together, plus the paint needed doing to make it special and I could only see the profit evaporating, so I gave it a swerve.
But I've learnt things from this thread and maybe someone else will in the future, if they search for a similar subject.
So thanks ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Shaft |
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Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
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Posted: 00:17 - 19 May 2019 Post subject: |
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Sorry, no links, it wasn't widely advertised, I got wind through word of mouth.
The only pictures I have are what the owner sent me, which won't tell you much and I'm not going to post them anyway, after the way I've described him here, I'm not going run the risk of embarrassing him or me by allowing him the opportunity of finding them on the net. ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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Old Thread Alert!
The last post was made 4 years, 342 days ago. Instead of replying here, would creating a new thread be more useful? |
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