murp
Drag-strip hero
Posts: 239
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Post by murp on Feb 4, 2021 20:25:32 GMT 1
I'm rebuilding my LC.... Joined the crankcase with threebond 1207..... Bit paranoid about base and head gasket leaking.... Is it ok to smear a smidge of threebond on gaskets or is threebond a gasket alternative .. Can't find a definitive answer anywhere ... Cheers 👍
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Post by kostas on Feb 4, 2021 20:33:57 GMT 1
I used it on the base gaskets as I noticed a leak when I did the leak down test.
I would not use it in the head gasket.
Kostas
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drzsimon
Weekend rider
Back after a long break
Posts: 90
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Post by drzsimon on Feb 4, 2021 20:34:58 GMT 1
Wish I had, Yambits gaskets leaking. Base gaskets front inner left and right and head gasket front left.
Just bought originals and also genuine head washers in case the 30 thou skim made the studs bottom :-(
Oh, well, strip and glue time...
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Post by tony2stroke on Feb 4, 2021 21:37:42 GMT 1
Try re-torquing it first, very common.
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Post by steeley on Feb 4, 2021 21:49:27 GMT 1
Head gasket on dry. Rest of the gaskets i rub grease round them . They come away with no problem when the engine is stripped in the future.
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Post by 4l04ever on Feb 4, 2021 22:20:53 GMT 1
You may need thicker base gaskets if the head and/or cylinders have been skimmed.
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Post by Norbo on Feb 4, 2021 22:29:30 GMT 1
i allways put some gasket on head and base gaskets just to be on the safe side
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Post by JonW on Feb 4, 2021 23:07:37 GMT 1
copper spray on the head gasket. used to do em dry but sick of leaks. base gaskets with grease, but sealant would be fine id think.
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Post by stusco on Feb 5, 2021 8:48:01 GMT 1
Smear of instant gasket on paper gaskets why not?
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Post by dusty350 on Feb 5, 2021 9:16:36 GMT 1
I always apply a thin smear to genuine Yam base gaskets when fitting. Never had a leak from them. Especially worth doing when there are witness marks from previous owners using a screwdriver to lever barrels from cases !! (probably coz there was some gasket goo on the gaskets !!  ) Last thing I want to do is strip a top end for a leak at the base, so a thin smear each side does the trick. Downside is you wont be re using the gaskets on subsequent strip downs, but I always fit new anyway. You may find you spend time cleaning the remains of the gaskets off cases and barrels but that's no biggy. The only other downside is cost of base gaskets if you wanted to reuse them - not too bad for the Lc owners, but far more expensive if you have a Pv  Dusty  |
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murp
Drag-strip hero
Posts: 239
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Post by murp on Feb 5, 2021 9:20:59 GMT 1
Dusty.... Your strip down thread is my bible on this engine build..... Thanks for doing it.... And thanks to everyone who has given advice, whilst I have been doing this for the first time 👍
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Post by jackjabba on Feb 5, 2021 17:10:52 GMT 1
I spray my base gaskets with copper spray and also the head gaskets if not genuine.
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) Last thing I want to do is strip a top end for a leak at the base, so a thin smear each side does the trick. Downside is you wont be re using the gaskets on subsequent strip downs, but I always fit new anyway. You may find you spend time cleaning the remains of the gaskets off cases and barrels but that's no biggy. The only other downside is cost of base gaskets if you wanted to reuse them - not too bad for the Lc owners, but far more expensive if you have a Pv 
