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Old 12-02-2009, 06:53 AM   #1
pusher
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Default JB weld on cylinder base gasket leak?

I have a base gasket leak on the front cylinder on my machine. You can see that whoever put the old gasket on effed it up because it's sticking out from the cylinder.

Could I slice off the excess, clean up the area and then jb weld over the crack to seal in the oil or will the internal pressures of combustion blow right past the hardened sealer?

I'm not losing too much oil from this area but I would rather not lose any at all. Tearing off the head and cylinder are not a job I would like to tackle at this moment.

Advice?



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Old 12-02-2009, 07:03 AM   #2
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Default Re: JB weld on cylinder base gasket leak?

DON'T use JB weld there - bad idea.

1) it won't hold - believe it or not, the vibrations cause movement between the case and the cylinder, the stuff would crack.

2) there are differentials of thermal expansion between iron and alloy which would cause the same thing.

3) you'd create a nasty mess of a repair that would make it difficult to fix properly later on.

Your best bet is to loosen the 4 base nuts (after removing the exhaust pipe and the intake manifold). Push the cylinder and head assembly up off the case, clean and re-align the gasket along with the mating surfaces and use some gasket cement to seal the whole schmeer up.

Yes - it's a little more work, but you won't bugger anything up this way.

Quote:
Originally Posted by pusher View Post
I have a base gasket leak on the front cylinder on my machine. You can see that whoever put the old gasket on effed it up because it's sticking out from the cylinder.

Could I slice off the excess, clean up the area and then jb weld over the crack to seal in the oil or will the internal pressures of combustion blow right past the hardened sealer?

I'm not losing too much oil from this area but I would rather not lose any at all. Tearing off the head and cylinder are not a job I would like to tackle at this moment.

Advice?



-pusher
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Old 12-02-2009, 07:15 AM   #3
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Default Re: JB weld on cylinder base gasket leak?

it makes a lot more sense to me now
especially the thermal expansion of metal vs mystery paste and engine vibrations

thank you.
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Old 12-02-2009, 07:25 AM   #4
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Default Re: JB weld on cylinder base gasket leak?

You're welcome.

I've done some really neat repairs with JB - and have seen some pretty amazing things done with it - but that's a function of application.
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Old 12-02-2009, 07:59 AM   #5
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Default Re: JB weld on cylinder base gasket leak?

pusher, with all due respest to chuckspeed, its a base gasket, its only weeping a little, just my way of doing things, but why not just live with it untill ya can fix it right?
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Old 12-02-2009, 08:58 AM   #6
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Default Re: JB weld on cylinder base gasket leak?

Also keep in mind if you do what chuckspeed said, to be careful that the pushrods stay aligned when you push it all back down!
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Old 12-02-2009, 09:03 AM   #7
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Default Re: JB weld on cylinder base gasket leak?

I had an S&S shovel that started leaking. Had never taken the heads/barrels off before. It is super easy to fix. Anything short of pulling them and replacing the gasket is very short term at best.

If I could do it...anyone can. Just part of the deal.


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Old 12-02-2009, 09:36 AM   #8
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Default Re: JB weld on cylinder base gasket leak?

Was thinking about this after posting up; removal/replacement is pretty easy. Set aside about two hours, and you're done.

Philosophically...

I've noticed on this (and other similar forums) you can divide folks into two categories: Those who balk at unbuttoning a motor - and those who don't. It seems to be about a 2/3rd - 1/3rd split, with 2/3rds in the 'balk' category. An informal observation, yes - but it's interesting to note that a thread on removing tape residue from paint is longer than one requesting dimensional tolerance advice.

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Originally Posted by Angelking View Post
I had an S&S shovel that started leaking. Had never taken the heads/barrels off before. It is super easy to fix. Anything short of pulling them and replacing the gasket is very short term at best.

If I could do it...anyone can. Just part of the deal.


AK
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Old 12-02-2009, 10:37 AM   #9
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Default Re: JB weld on cylinder base gasket leak?

mine was squirting oil (bad)between the cylinders and i didn't want to tear into it right now so i used brake cleaner and a tooth brush to clean it. then i got some 1104 threebond and just gooped it on there. i let it sit overnight and wallah! no more leak. been that for a few months now. when i get room in the garage i'll tear into it and fix it right.
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Old 12-02-2009, 10:46 AM   #10
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Default Re: JB weld on cylinder base gasket leak?

Quote:
Originally Posted by chuckspeed View Post
Those who balk at unbuttoning a motor - and those who don't.
This must be a beginner thing...I mean, once you DO it and realize how simple these old motors are (I'm talking Triumph/BT/XL here) you are no longer gripped by The Fear, and thus your Mechanical Muse is allowed to let it's freak flag fly.

Or something like that.
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Old 12-02-2009, 10:50 AM   #11
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Default Re: JB weld on cylinder base gasket leak?

Do shit right or do shit twice? I wouldn't fix my toilet with JB weld let alone my bike. Thats just my opinion though. Really just take a couple hours and do it right or spend Three time the amount of time to put shit on it and clean it off later to fix it properly.
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Old 12-02-2009, 11:30 AM   #12
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Default Re: JB weld on cylinder base gasket leak?

Buy an evo.
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Old 12-02-2009, 11:43 PM   #13
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Thumbs up Re: JB weld on cylinder base gasket leak?

I decided to scrap the bike and buy an evo
it was only $35,000 so it was a cheaper fix than pulling the motor for the gasket or using that 1104 gasket maker

thanks for the info
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Old 12-03-2009, 12:29 AM   #14
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Default Re: JB weld on cylinder base gasket leak?

The original question warrented my response.

There is some general knowledge/skill or even willingness get your hands dirty that is required with older bikes.

If you want to half-ass it, by all means, sell it to someone who will do the work, and buy an evo that doesn't leak.

That's all I'm saying.....

Last edited by hdrl1935; 12-03-2009 at 12:36 AM.
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Old 12-03-2009, 05:36 AM   #15
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Default Re: JB weld on cylinder base gasket leak?

Quote:
Originally Posted by hdrl1935 View Post
Buy an evo.
evo's like to leak at the base gaskets.
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Old 12-03-2009, 07:39 AM   #16
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Default Re: JB weld on cylinder base gasket leak?

Quote:
Originally Posted by bustedlifter View Post
evo's like to leak at the base gaskets.

Agreed. Studs come loose or the jug bases warp. One thing I've found about temporary repairs: They're temporary.

Gauren-fucken-teed, the time that thing will let loose will be when you don't want it to the most. On a run, or right before one you really wanted to go on.

Over the years, and with many bikes, I learned to just fix stuff right the first time and save myself the headache later.

And I've had headaches due to temporary "fixes".
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Old 12-03-2009, 09:56 AM   #17
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Default Re: JB weld on cylinder base gasket leak?

buy an evo, pfft...the only evo I've seen that didn't leak didn't have any oil in it.

Just fix it right man, it really is as simple as everyone is saying. I think the lift/realign method would only save you about 10 min over just doing it right. Plus you'll feel like a badass after your first time doing it.
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