NO!Cam caps cracked! - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 38 (permalink) Old 01-30-2007, 03:33 PM Thread Starter
 
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Exclamation NO!Cam caps cracked!

Yep you heard right! Got the motor back in the frame on me own! (hard as hell) took best of the weekend, timed motor all the works! now, putting the cam caps on taking turn on each bolt in the correct order. come to the cam cap on cyl. 4 and started to turn bolt in, and what do i hear... SNAP!!! the classic sound of what i thought threads being stripped.

I slowly look up fearing the worst and what do i see? massive crack stright down the middle of the machined hole for the bolt going straight through the cap? how i don't know what happend! So being ghetto as i am and not willing to pay...'ahem' $1,200 for a new cylinder head since its a lined-bore engine i decided to go with J-B weld. Well that didnt work so good, tightened it down good look at the cap and there i see the same crack through the J-B weld, so i slapped some more on!

Now im kinda afraid of it grenading on me going down the road? what do you think???
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post #2 of 38 (permalink) Old 01-30-2007, 03:36 PM
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i kinda thinking I wouldnt want to be riding it down the road...before fixing or replacing it anyways...
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post #3 of 38 (permalink) Old 01-30-2007, 03:38 PM
 
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What bike is it?
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post #4 of 38 (permalink) Old 01-30-2007, 03:44 PM Thread Starter
 
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Its a 95 ZX6E

The second batch of JB weld i made was noticebly tougher then the first batch...prob didnt mix it right

Well i dont want to just ditch the bike...ive had her for awhile
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post #5 of 38 (permalink) Old 01-30-2007, 03:56 PM
 
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show pix...

-a|ex
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post #6 of 38 (permalink) Old 01-30-2007, 04:01 PM
 
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show pix...

-a|ex
lets see what you talking about.

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post #7 of 38 (permalink) Old 01-30-2007, 04:10 PM Thread Starter
 
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ok this is the best quality pic i got get without the cam going crazy on me...sorry i don't have a "before" pic but least you can see where i put the second layer of JB weld on
Just think of the crack starting dead center where the bolt is working its way down towards the rear of the cap at the bottom

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post #8 of 38 (permalink) Old 01-30-2007, 04:14 PM
 
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can you get the bolt in there good? you might also consider taking it to a machine shop and see if they can't "weld" it for you.

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post #9 of 38 (permalink) Old 01-30-2007, 04:26 PM Thread Starter
 
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yea the end of the cap where the crack is is nearly flush with the cyclinder head...i was debating of getting it welded but would it fall on deaf ears since they may consider it liability and all that nonesense

Not too sure if the bolts wants to go down any further though prob 1mm gap bit smaller from cap to cyl. head maybe .5mm?
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post #10 of 38 (permalink) Old 01-30-2007, 04:33 PM
 
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yea the end of the cap where the crack is is nearly flush with the cyclinder head...i was debating of getting it welded but would it fall on deaf ears since they may consider it liability and all that nonesense

Not too sure if the bolts wants to go down any further though prob 1mm gap bit smaller from cap to cyl. head maybe .5mm?
good question. but I would if you want to try on the rigged way. you really should call around to the machine shops and see if some one can weld it up right. it would be much safer then jb weld.

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post #11 of 38 (permalink) Old 01-30-2007, 04:36 PM Thread Starter
 
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True...i have a couple of welding specialists just down the road from me but i'll give em a call later was thinking bout going to give the JB another day and just dry crank the motor see if i can see any stress on it

I may consider the actual welding job...

Wouldn't they have to TIG weld it? no other way MIG welding would just be almost impossible for it
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post #12 of 38 (permalink) Old 01-30-2007, 05:02 PM
 
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True...i have a couple of welding specialists just down the road from me but i'll give em a call later was thinking bout going to give the JB another day and just dry crank the motor see if i can see any stress on it

I may consider the actual welding job...

Wouldn't they have to TIG weld it? no other way MIG welding would just be almost impossible for it
probably. I would deffinitely let it run for a while let it heat up and give it some revs before I would ride it any where after they weld it.

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post #13 of 38 (permalink) Old 01-30-2007, 07:07 PM
 
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this MAY just be a good scenario for ebay, or a bike salvage yard to replace the part. I bet the salvage yard would be like $200 for a new head, instead of $1200. this is one of those things I believe you should either do it right, or not at all.
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post #14 of 38 (permalink) Old 01-30-2007, 10:20 PM
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Yeah the alum will require TIG. Just try to talk to them about a cash no paperwork weld job. You never seen them...they never seen you under the table job.




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post #15 of 38 (permalink) Old 01-30-2007, 10:24 PM
 
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That sucks.



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post #16 of 38 (permalink) Old 01-31-2007, 02:04 PM
 
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this MAY just be a good scenario for ebay, or a bike salvage yard to replace the part. I bet the salvage yard would be like $200 for a new head, instead of $1200. this is one of those things I believe you should either do it right, or not at all.
I agree if you got the cash do it right but...if not

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Yeah the alum will require TIG. Just try to talk to them about a cash no paperwork weld job. You never seen them...they never seen you under the table job.
do it this way...

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post #17 of 38 (permalink) Old 01-31-2007, 03:03 PM
 
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post #18 of 38 (permalink) Old 01-31-2007, 04:55 PM Thread Starter
 
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Well have decided to go with the weld job but kinda hard to get hold of them...left a bunch of messages on their machines and just see what happens. JB weld so annoying to get off! well got most of it off that was directly over the crack.

Although one welder i was able to get in touch with said that he would have to cut a "V" shape groove along the entire crack to get a good weld? kinda scared me when he said that! put up some more pics later of the actual cracks without the JB weld on it
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post #19 of 38 (permalink) Old 01-31-2007, 05:02 PM
 
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Well have decided to go with the weld job but kinda hard to get hold of them...left a bunch of messages on their machines and just see what happens. JB weld so annoying to get off! well got most of it off that was directly over the crack.

Although one welder i was able to get in touch with said that he would have to cut a "V" shape groove along the entire crack to get a good weld? kinda scared me when he said that! put up some more pics later of the actual cracks without the JB weld on it
ya they might have to do some cutting to get a good solid weld...thats possible I would ask around some first thought.

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post #20 of 38 (permalink) Old 01-31-2007, 08:44 PM
 
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if you want them to actually get to the crack and not just the surface, they will have to remove some material first then add. Otherwise they would have to throw ALOT of heat on the head to get penetration that deep and nobody wants that.
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