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Hi, im just wondering if someone can give me some general mechanical advice/info, I went and had a look at a car, i was told the previous owner rebuilt the tappets and when putting them back in 3 of the tappets were over tightened and the threads were stripped, i was then told the 3 tappets may need to be heli-coiled?
if someone can give me some advice info?
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What type of motor? Stripped threads shouldnt happen if ya know what youre doing,the old saying of tighten it up till it strips then back it off 1/4 turn . Helli coils are really strong but an new head might be another option.
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If the motor needs heli-coils to repair 3 stripped threads, how confident are you of the remaining "yet to be stripped" threads? Or for that matter, the rest of the motor? Sounds like the engine was built by Gorilla Engineering, with no torque wrench, or mechanical aptitude. Utility8  |
utility8
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Maybe he's looking at something with alloy heads (or head) such as a VL 6, VT2 onwards V8, or VZ-VE Alloytec V6?
Cheers,
Mick
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Cheers,
Mick
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Judge a successful man not on how he treats his peers, but on how he treats those less fortunate. |
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quote:
Originally posted by commodorenut
Maybe he's looking at something with alloy heads (or head) such as a VL 6, VT2 onwards V8, or VZ-VE Alloytec V6?
Cheers,
Mick
Finally some one with some Brains , E.G I helicoil every part that is alloy (intake manifolds especially) from new , when ya taking things on and off the alloy threads are bound to fuk up in time just like stainless threads do.... that's MHO anyways.
anyway GMH please let us know a bit more info.. yanno it helps us help you mate CHEERS
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There are certain parts of certain rebuilds that require Helicoils. For example a good Volkswagen engine rebuild will have helicoils in the spark plug holes to eliminate the possibility of thread galling. Helicoils are used not just for stripped threads, but to eliminate friction galling. If it is old or rare - Cut it! http://www.ehlimo.com.au/ |
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Hey, sorry about the lack of information, yes it is a vl 6cyl turbo, after doing some more reasearch i now understand what the helicoil means and how it will be stronger in the future etc etc, i am buying the car for the running gear and the motor will be rebuilt, however i would prefer it if i didnt have to change the whole head...
the owner said the tappets needed rebuiling, so he done that and when installing he was told to go to 27 which he did instead of 25 or something along those lines
Thanks for the help so far, also if anyone else can give me advice on what to check obviously the motor is not running, however i can tell its mostly stock etc etc
Thnaks in advance
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quote:
Originally posted by peter_smol
There are certain parts of certain rebuilds that require Helicoils.
For example a good Volkswagen engine rebuild will have helicoils in the spark plug holes to eliminate the possibility of thread galling.
Helicoils are used not just for stripped threads, but to eliminate friction galling.
You nailed it with that comment!!
GMH there is nothing wrong with helicoils if done right, hope this helps you!
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There is a far superior product to Helicoils and it's not one that many seem to know about. I stumbled upon them a few years ago when manufacturing Injection moulding tooling/dies made from aluminium. We were constantly finding stripped threads from heavy handed Die-setters, and we looked for an alternative to Helicoils because they just strip out in time. Here is a link to the product we were using. http://www.minibearings....insertskeensert/all/1/3/
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I've used the RECOIL kits many times and if installed correctly they work well. Comes with the drill and special sized tap and installation tool. http://australia.rs-onli...rtial&N=4294857641&Nty=1
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Recoils use the same principle as Helicoils, they are basically wound wire not a solid tubing, but Keenserts are a much better solution especially for threads that have to be serviced regularly.
They are more expensive but well worth it.
Dr Terry
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