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Post by 1quikvento on Aug 3, 2011 20:54:57 GMT -5
The guy who did my 70cc swap called and wanted to know how it was doing. I said fine except I noticed a lil oil on the back of the air box.
I pulled the scoot in the shop after quitting time and wanted to check compression just to see how it was doing since the kit. First #'s came up 75psi. I thought maybe I was missing a trick or step. So I opened the throttle and I got 80psi. tried twice more and never got past 80.
I was a little ticked off. While I was under there I noticed some oil. So I pulled the shrouds off and sure enough my head gasket was seeping. Better than that the lower right head stud nut was missing.!
I fix cars at honda and I dunno wat thread size them head bolts are But i had to take a demo to lowes to get a nut.
I noticed before anything that one stud with the missing nut looked longer than the rest. When i tried to torque it down my fear was realized...
So I'm expecting the threads in my case to be pulling out due to too much torque on the installers end im guessing. Can someone please tell me the best route to take to fix them cylinder threads?
Im gonna lay into this guy tomorrow. I know its fixable but WTF!! Now I gotta wait for another gasket kit, a week or more in down time, whatever kinda head bolt has to be ordered....
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Post by 90GTVert on Aug 3, 2011 21:27:22 GMT -5
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bigjeff
Scoot Enthusiast
just scootin
Posts: 294
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Post by bigjeff on Aug 3, 2011 21:29:07 GMT -5
hate it for you.  |
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Post by 1quikvento on Aug 4, 2011 8:15:53 GMT -5
Are the threads that seat in the case the same as the threads that hold the head nut ?
Im thinking of retapping to the next size but I dont know. will the head and cylinder even have room for a bigger stud or are they usually snug?
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Post by 90GTVert on Aug 4, 2011 8:22:11 GMT -5
Yeah, the studs are M7 x 1.0 on both ends.
It would be close. You'd have room in the case for a larger stud. You could drill the head and cylinder holes larger if necessary.
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Post by 2strokd on Aug 4, 2011 8:24:44 GMT -5
Dangit man! |
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Post by 2strokd on Aug 4, 2011 8:26:18 GMT -5
I wouldnt be too hard on the guy...Sheez! Never had a bolt come loose? If the rest of the job was done right and it ran well i wouldnt suspect it to his fault.?. Bolts and nuts come loose on the best of mechanics.
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Post by 90GTVert on Aug 4, 2011 10:08:51 GMT -5
Very true. We are dealing with chinese stuff here too.
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Post by 1quikvento on Aug 4, 2011 14:04:56 GMT -5
Im not the mean pissed off mechanic that everyone hates from ytime to time. Yes tempers do flare from time to time and shit happens. Its not the leak or having to fix threads that gets under my skin. Its the disappointment. I got my rollers, nico vari and jets in today and I gotta fix the case threads before I play with my new parts.
Im the guy that if a problem arrises i dont whine and complain and point fingers.I start looking for a solution. Simple philosophy- Everyone makes mistakes- Its how we go about correcting them that makes the difference. Told myself that ever since I started wrenching for my dad.
So im wondering if I can find a bolt long enough to go bigger on the bottom threads and recut the top threads to the original M7-1.00.
Ill figure something out- just wanted to know if anyone sells a repair kit for this problem- like the ford triton spark plug issue....
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Post by 90GTVert on Aug 4, 2011 14:41:13 GMT -5
There are no repair kits for this issue, other than a helicoil kit. That's basically what the timesert is for the triton, a fancy helicoil and the means to reach it since it's in a tough spot.
The stock studs are 107mm (4.2"). It might be hard to find a bolt that long, depending what size you go with. You'll probably find a better selection at most local places in SAE instead of metric. All thread could work.
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Post by 2strokd on Aug 4, 2011 15:05:40 GMT -5
Have you taken it apart yet to see the damage?
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Post by 1quikvento on Aug 4, 2011 21:18:23 GMT -5
No i havent tore into it yet. Snap on comes around on thursdays and my new microscan came in so I went home and played with it for a couple hours. I suppose since the weekend is here I can check it out. Wasnt gonna till i found some hardware first.
Should I order a new gasket kit?? could i get away with reusing the ones i got since theres 100-150 miles on em? Not sure wat the base material was, but dude said the head gasket was a metal one, not the o-ring type.
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Post by 90GTVert on Aug 5, 2011 7:57:43 GMT -5
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Post by 1quikvento on Aug 5, 2011 9:20:24 GMT -5
thanks- two things.
Can i use my old 49cc cylinder as a model for the new base? im guessing yes??
And Do i even need a spacer or can i just make and use one out of the gasket material?
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Post by drawkward on Aug 5, 2011 10:28:18 GMT -5
I've tapped a larger cylinder bolt into a case. Other than just having toenlarge the stud passage in the cylinder and head and use a different size socket on that larger stud when working on it; it worked. I ended up switching out the case half later on due to related issues. If I could go back, I would use a thread insert (Helicoil*); do it the ol' tried-and-true way. I reuse my gaskets - but they get a few nice, even coats of copper spray after a good cleaning. I don't like to reuse base gaskets if I don't have to. I usually don't have to since I bought a roll of Felpro Karropak gasket paper at Advanced Auto. Here's a link to a $5 incl. shipping roll I found on Google. I still have plenty left of my roll after cutting at least 10 gaskets (base, intake, carb) for various engines. |
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