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Location:
Ipswich
Registered:
May 2002
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Gasket goo
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Thu, 22 April 2004 13:16
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Is it better to just use the gasket goo by itself or use it with a paper gasket as well?
I'm trying to seal the bellhousing to the gearbox (A bellhousing to T-series T50), and my previous two boxes have leaked like a sieve.
In the first box I used 1 washer for each bearing, cleaned everything with turps and used gasket goo and a paper gasket. Held for a few days, then started leaking and got progressively worse.
In the second box used 2 washers for the output shaft to take up the slack and 1 washer for the lay shaft. Cleaned everything using kerosene (couldn't find the turps) and used gasket goo and another paper gasket. Leaked from day 1, lost virtually all my oil within a few days.
Now have 3rd gearbox, going to put the bellhousing on tomorrow or day after, someone suggested just using the goo by itself (btw I'm using the ultra blue stuff), but someone once told me a long time ago that using a paper gasket with the goo is better?
Any ideas?
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Gasket goo
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Thu, 22 April 2004 13:47
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if i use a paper gasket i use the aviation cement (gasket goo in a small white bottle, red lid) on the gasket paper.
but on nearly everthing nowdays i use Ultra copper (Copper Maxx) silastic.
mmmm.. gearbox i would use the silastic. but not tighten it fully until the silastic has cured.
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Location:
Ipswich
Registered:
May 2002
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Re: Gasket goo
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Thu, 22 April 2004 13:53
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What's the difference between ultra copper and ultra blue?
So you recon to put the goo on and wait for it to cure before tightening it up? I thought you were meant to tighten it up before it cured...?
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Gasket goo
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Thu, 22 April 2004 13:58
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well the ultra copper has a higher heat range, i use it for my turbo gaskets etc. so i just use it everywhere else.
i do mean to do up your bolts, but i dont tighten them totaly straight away. metal to metal, will push most of it out.
thats just how i do it though.. 
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Location:
Ipswich
Registered:
May 2002
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Re: Gasket goo
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Thu, 22 April 2004 14:02
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Ah okay... And I take it that it works well for you... Hmm, might give that a go. So I assume you don't use loctite on your bolts then (since the loctite will also cure if you don't tighten them straight away...)
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Gasket goo
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Thu, 22 April 2004 14:29
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if you are keen to loctite the bolts...
paper gasket, silicon on both sides, tighten to .. between finger and hand tight with just an extension bar (so the goo starts to squeeze out, but not all of it..
wait overnight for it to cure, take the nuts/bolts off one at a time, and loctite them and tighten properly.
thats what i do anyway.. takes longer, but never leaks.
Cya, Stewart
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Location:
Ipswich
Registered:
May 2002
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Re: Gasket goo
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Thu, 22 April 2004 14:30
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Stewart: so you recon using a paper gasket is better than just plain goo?
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Gasket goo
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Thu, 22 April 2004 14:42
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yup i do.. gasket paper should be ok if the surfaces are clean and straight...but the silicon will help fill any irregularities..
if you are having such bad sealing issues, maybe the surfaces are not flat? or there is some mechanical thing stopping them from sealing properly?
use the black oil gasket paper, and your choice of silicon..( i like ultrablue atm.. not for any particular reason  ) and if it still doesn't seal, theres something odd going on..
good luck 
Cya, Stewart
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Location:
Ipswich
Registered:
May 2002
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Re: Gasket goo
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Thu, 22 April 2004 20:58
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It's completely beyond me why they don't seal... It *looks* and *feels* flat. When I took the bellhousing back off yesterday it didn't look like any oil was getting past the goo or the gasket paper. In fact in both cases that it's leaked it didn't even look like it was leaking at the bellhousing, looked more like it was leaking from the center split in the gearbox... But because it's happened exactly the same on both gearboxes (which were fine until I changed the bellhousing) I'm guessing it's the bellhousing...
BTW, how thick a gasket paper should I get? I've got a roll of gasket paper at the moment, not sure what it is - will check later.
What do you use to clean the surfaces?
Is more goo "better"? I've been laying down approx 3-5mm beads...
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Location:
Madrid - Spain
Registered:
August 2002
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Re: Gasket goo
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Fri, 23 April 2004 00:24
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It might be worth checking the box and bellhousing mating faces for straightness in the same way you would a head, by using a straight edge. A steel rule is adequate for the job if it hasn't been damaged.
Oh and the ultra copper is O2 sensor friendly. I am not sure if the blue is though. Plus the temp ranges are different.
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Location:
Ipswich
Registered:
May 2002
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Re: Gasket goo
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Fri, 23 April 2004 00:54
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Yup both the gasket goo's I have (Ultrablue by Permatex? and Maxx Blue by Loctite?) say "sensor friendly". Temp range I would assume should be okay on a gearbox, but they do both say to avoid contact with gasoline but I can't see that being a problem with a gearbox...
Will try to check the mating surfaces on the bellhousing and gearbox.
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: Gasket goo
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Fri, 23 April 2004 14:23
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if the bolt holes in the trans are not "blind"/go through to the inside of the case, then those bolt threads will need "goo" on them since the oil will come out through the threads & lock washer.
otherwise, with good surfaces, a very thin paper gasket(witout goo) should last just about forever.
there is a lot of load on that joint, and it isn't the place for a thick gasket.
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Location:
Newcastle NSW
Registered:
June 2002
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Re: Gasket goo
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Fri, 23 April 2004 16:21
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try sikaflex 221 (i think thats the code) black polyurethane sealant with a good clean surface this stuff is stickier than baby shit to a blanket so it ranks up there in worlds stickiest stuff 
basically its the best sealant around for those jobs where you dont have sensors and stuff cos it doent say sensor safe so dont trust it there.
how do you think the interior of the new millenium trains is held in  really thats what they use for alot of it
beware if you use it wear gloves unles you want dirty hands for a week 
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Location:
Ipswich
Registered:
May 2002
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Re: Gasket goo
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Fri, 23 April 2004 21:28
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Test fitted the two yesterday, I think I know why it didn't seal - they aren't even flush with each other. With no washers at all (around the bearings) it still seems to sit a little proud (probably about 0.5mm), can't see where it's hitting but I suspect it is the edge of the bearing carrier. Looks like the T-T50 and the A-T50 bellhousings aren't "bolt together compatible" after all...
Tested with different numbers of washers and ended up with 2 on the input shaft and none on the layshaft, hope it doesn't put too much load on the bearings. With that combination it is no more proud than it is without the washers.
Have stuck the two together now, blue goo and gasket paper, finger tight with the ratchet. Will wait till it cures and then torque it up and hope for the best...
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