Head Leak

Brains

New Member
Jul 21, 2008
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Adelaide Australia
I've just put together my first motorized bike & from the word go the head is leaking to one side only (front right), I have followed instructions to a tee 12ft/lbs head bolt tension, but it seems not to seal up, I have taken the head off & gasket is not blown, cant stop the leaking, should I put a dab of blue locktite on head bolts as well, but I cant see how this will rectify the problem, any suggestions would be greatly appreciated
 

Ilikeabikea

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Staff member
Jan 27, 2008
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Torque the head bolts down in an x pattern. Run the engine, let it get hot. After it cools down retorque in an x pattern again. They will be loose. The next couple of times you ride retorque the the bolts. You might spray some aluminmum paint on both sides of the head gasket. I don't think I would use loctite on the head bolts. Hope this helps...............................
 

Brains

New Member
Jul 21, 2008
132
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Adelaide Australia
Thanks for the tip, I will give it a go, the distributor on his web page states to use locktite, but I will take your advice and do as you say, and will see if this stops the leak

Cheers
 

Jemma Hawtrey

New Member
Dec 29, 2007
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Essex, UK
Good luck with it...

Tightening down anything like a head or even the valve cover on a motor - always go crosswise as has been said - doing anything different will likely cause warping of the head - specially on alloy motors..

Jemma xx
 

Brains

New Member
Jul 21, 2008
132
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0
Adelaide Australia
X is the word, when its daylight I will ride around the block a few times & get her hot, once its cooled I will do the X thing & take her out for a flang, and do the same over again.

Hopefully this will rectify the issue, I have noticed the studs are very poor quality so I might try to replace them with better ones from somewhere.
 

Pablo

Master Bike Builder & Forum Sponsor
Dec 28, 2007
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All good advice.

If the Al paint doesn't work, you may need to lap the head a bit on some wet dry sandpaper (wet w/water and dish soap) - see Norman's thread. Then use a NEW gasket and the Al paint trick.
 

HT60CC

New Member
Jul 23, 2008
23
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Slough, England
I'm having problems with the cylinder head myself right now. Basically I managed to strip all of the studs so I replaced them all. When I put the head back I used some crappy nuts which stripped and now I got to removed the nut aswell as redo the studs as they have been damaged while trying to remove the nuts.

The problem is I used some stupid epoxy resin based blue to stick in the studs, which is making it difficult to to remove them. LOng hours will no doubt be spent working on it next week.
 

HT60CC

New Member
Jul 23, 2008
23
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0
Slough, England
Well I've dicovered that this epoxy based stuff (araldite I think it's called) can be broken down using solvents, white spirit (naptha as I believe it's known in the USA) seems to work So when I get the head of I'll put some white spirit on the threads of the studs to get them out, or I'll heat them up, or maybe I'll be able to get a decent enough grip on the studs with the head of to remove them.
 

Brains

New Member
Jul 21, 2008
132
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Adelaide Australia
F#*!# sake, set the flippin tension wrench to 12ft/lbs as noted on the instructions & bang the nuts have threaded, off now to the store to get some high tension M8/1 nuts & try again, I know how you feel mate, just had wished I logged on before I tried to tension my head again & would have read your thread & I would have lowered the setting for precautions, cant understand though Ive done everything exactly as stated on the instructions?, anyway its 9.20am in Australia on a Sunday, will need to wait another 1/2 hour before shops open,
Fantastic idea about lapping the head, I will have to order another head gasket just in case it still leaks, this is going to take a few more days before I receive it though, spewing its a cracker of a day & hanging to ride my new spanking bike all over the place, bu the way when you all state aluminium paint, I have never seen this in stores over hear?

Cheers all
 

Ilikeabikea

Moderator
Staff member
Jan 27, 2008
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Ptown, Texas
You guys might call it silver paint. On the torque you want to pull all the bolts down evenly. Maybe torque them all to 6 ft lbs then go to 12. Just nice slow and even...........................
 

Brains

New Member
Jul 21, 2008
132
0
0
Adelaide Australia
No problems will try doing it as per your instructions, do you think I could give it another go by using the same head gasket, & I will pull it apart when the new one arrives and swap it over
 

Brains

New Member
Jul 21, 2008
132
0
0
Adelaide Australia
She's all friggy diggy now, took the top half of the motor off, helicoil to all the stud mounts, machined 4 new studs from high tensile steel, new high tensile bolts, used an aluminium sealer on the head & barrel face, tensioned to 25ft/lbs, & bingo she's not leaking from anywhere now, she runs smooth as & no oil stains anywhere, thanks all for your advice, will do this to every new motor I get from now on as standard mod.