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Post by scrambler on Aug 1, 2017 12:30:59 GMT -5
Hi All,
I was just browsing the service bulletins and one of them says that in order to avoid leakage underneath cylinder head silicone should be applied on both sides of the head gasket. I`ve never heard anything like this and never done anything like this before to any head gasket, including the TX engine I`m assembling. Should I be worried? Any experience on this matter? Thanks, Greg
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Post by retromech on Aug 1, 2017 14:07:52 GMT -5
Hi Greg I pondered on this when I built my engine, after talking with many of my friends that build engines professionally the opinion was split 50/50, so I did not use any form of sealant, having run the engine for several hundred miles the biggest problem was that the cylinder head needed to be retorqued and you know that is almost impossible to do with the engine in situ as it is very very difficult to remove the cylinder head cover to gain access (I won't use impossible as I am sure someone has found a way round it), from my experience your cylinder head will need retightening on more than one occasion with use-joys of the TX (unless you have the alligator head cover of course !!). Not sure if this helps you but it at least puts someone's experience to it. Kind Regards Paul.
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Post by jayteenz on Aug 1, 2017 15:04:58 GMT -5
Hi Paul
Is the "alligator head" you refer to the mysterious alternative head that featured on the old Toby Folwick site ? If so, do you have any more information about it or is it still a mystery ?
Cheers - JT
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Post by scrambler on Aug 1, 2017 15:24:55 GMT -5
Paul,
Your cylinder head needed retightening because you observed some leakage? Would it help if you tightened the bolts to higher torque then specified? I don`t think they pulled out the engine and retightened the head when the bikes were new..
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Post by retromech on Aug 2, 2017 10:18:13 GMT -5
Hi GUYS, Will combine my reply too you both, firstly some months ago a Japanese market x police bike appeared for sale on ebay in the UK,I had looked at this but decided to not bid (have too many projects already), A friend of mine emailed me and pointed out that on close inspection of the pictures that it had the infamous "alligator/crocodile" head cover, I looked closely and can confirm that is what it appeared to have, sadly in hindsight I did not bid, not sure if the present owner knows what they have, but I assume they are in the UK. Secondly I experienced oil leakage and combustion leakage after several hundred mile use, I found the outer allen bolts to be finger tight and the main nuts quite loose, all nuts/bolts had been tightened to the correct torque, left 24 hrs and retorqued correctly when assembling engine. Not sure if a higher torque would help, other people views would be welcome. Kind Regards Paul
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Post by scrambler on Aug 2, 2017 15:07:44 GMT -5
Thanks Paul, this crocodile head cover sounds interesting, you don`t have the link for the ebay listing, do you?
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Rasputin
New Member
Had another run on the TX today. Not smoking as much as it did. Not sure the motor sounds too good.
Posts: 47
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Post by Rasputin on Aug 18, 2017 14:01:19 GMT -5
When I got my 73 TX I noticed traces of orange silicone that had been squeezed out from the head gasket joint. I can only surmise this has been applied at some time when an engine leak was discovered or part of the service schedule update. In U.K. The first silicone engine sealant was marketed as Orange Hermetite. I remember it well as it could be used instead of gaskets.
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Post by scrambler on Aug 25, 2017 11:34:33 GMT -5
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Post by retromech on Aug 25, 2017 15:52:28 GMT -5
Hi,Sadly I have been unable to locate the relevant advert on ebay, probably as it was several months ago, I will keep trying it may turn up. Kind Regards Paul
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chris
New Member
Posts: 4
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Post by chris on Apr 7, 2019 5:05:19 GMT -5
Hi All, I was just browsing the service bulletins and one of them says that in order to avoid leakage underneath cylinder head silicone should be applied on both sides of the head gasket. I`ve never heard anything like this and never done anything like this before to any head gasket, including the TX engine I`m assembling. Should I be worried? Any experience on this matter? Thanks, Greg Hi all, I also took my engine out to due to (minor) oil leakage between the head and the cylinders. I sourced a new engine gasket set on ebay which I believed was genuine set, but it isn't and maybe there are no genuine sets available anymore. Both the engine block, cylinders and the head has a machined groove like grooves for an o-ring, but the new gaskets or the set doesn't contain anything to suit these grooves. The old head gaskets also have the extras to fit the grooves - see photo. Can anybody tell me if I need to find another design cylinder and head gaskets making sure of as tight engine as possible?
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Post by tr1ppler on Apr 8, 2019 8:49:36 GMT -5
I had the same thought. I used Aircraft gasket maker (doesn't harden and is good to 400*) on mine. I didn't notice my gasket filling in those grooves like yours, but I wasn't sure if something goes in there or if it is just an expansion joint for the heat.
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chris
New Member
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Post by chris on Apr 10, 2019 7:56:11 GMT -5
Hi tr1ppler Thank you. I can only confirm that mine had some kind of material in the grooves as also visible on the old head gasket. Its definitely not a part of the flat gasket itselves as it comes off pretty easy and breaks quite easy too. Are you simply using such kind of liquid sealant together with the normal gaskets on all flat gasket surfaces?
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Post by tr1ppler on Apr 10, 2019 8:45:04 GMT -5
Yup, using aircraft gasket maker on all the surfaces I don't expect to take apart again. For the sidecovers I'm using grease in case I need to get in there again.
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chris
New Member
Posts: 4
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Post by chris on Apr 10, 2019 13:31:07 GMT -5
That´s the worry, as if the sealant is working as a glue adhesive things gets pretty hard to dismantle again. Ardo has just told me that a RTV silicone sealant is good to use filling these grooves. That is probably more or less the same as your Aircraft Gasket Maker. NB Ardo is the man who produces the strong starter clutch rebuild set for the TX750
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