Wot size Timeserts for M9 studs?

mcnicol

mcnicol

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Location
Safety Harbor, Florida, USA
I have my Jota crankcases apart at the moment, and I'm thinking of Timeserting the head studs while I have it apart. Local machine shops just look at me like I'm from Mars when I mention M9 studs, but that's another story :D. If I give them a Timesert tap & reamer kit and a handful of inserts they can't go wrong just installing them. I think :o. They've got to do a better job than me, I know I'd get at least one crooked.
Anyway, does anybody have a recommendation on what size insert to use so I can offer to buy the right ones? They come in 9, 13, 18 and 22 mm lengths.
And, do you use a threadlock compound when you put the studs back in or just screw them in until they're fairly tight? Or maybe tighten with 2 nuts until you reach a specific torque value (but the studs are twisting and they're different lengths so what torque do you use)?

Ken
 
Thread on the stud is aprox 18mm long so I use the 18mm long inserts. Use low strength threadlocker when inserting the studs if you screw them in until they are tight they will sit a bit low. Aim for a fitted length of 208mm for the shorts and 240mm for the long ones. No point doing them if the threads in the cases are good.


    Keith
 
laverdakeith said:
No point doing them if the threads in the cases are good
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Keith, mine are good, but it's good to have the info just in case. I pulled a couple of studs on my '73 3c but looking back I'm pretty sure I must have had the studs upside down. Won't make that particular mistake again.

Ken
 
Apologies for raising an old thread but its needs must when we are attempting to repair an old thread !

My engineer is going to timesert two of 9mm crankcase holes.

Can any of you good fellas recommend a good source for the Timserts and tool...

Im building a series 1 1200 engine ..

Cheers !

Joe
 
jotajoe said:
Can any of you good fellas recommend a good source for the Timserts and tool...
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Hi Joe,

I've bought Timeserts from an outfit called Mechanics Tools and Bits in the USA, not least 'cos W?rth here in France won't deal with private customers (or at least my local branch won't).  But I think W?rth UK don't have the same attitude ...

http://www.wurth.co.uk/search/time+sert+m9

http://www.mechanicstoolsandbits.com/

HTH

Craig
 
When I had a thread go in the past I have threaded round bar and drilled and tapped a hole in the middle. Part this off to desired length and I had my own custom thread inserts. It takes no time on the lathe to do really. Its amazing how fellas in machine shops are working with out basic skills these days......
 
andyp said:
When I had a thread go in the past I have threaded round bar and drilled and tapped a hole in the middle. Part this off to desired length and I had my own custom thread inserts. It takes no time on the lathe to do really. Its amazing how fellas in machine shops are working with out basic skills these days......
Click to expand...

That's all good and well if you have enough "meat" to work with Andy. 

The stud bosses in the crankcase lower are a bit on the thin side, I'd try to retain as much of the original alloy as possible in this area if I needed to repair any threads.  The beauty of Timeserts et al is the thin-walled nature of the insert, the internal and external threads actually run inside each other, something which isn't easy to make from scratch.  And they are swaged upon installation, putting them in place for eternity.

Don't really think basic skills have been lost, just not so much need for them these days with so many off-the-shelf solutions readily and cheaply available.

piet
 
Blank looks from engineering shops is more my point they are supposed to be solution providers I would go somewhere else. ;)
 
I was just quickly looking for a good supplier and happened upon this info-video its actually quite good and very informative Maybe admins could get around to putting up a little knowledge base section one day and we could build a little laverda university as I think Laverdapedia has much room for improvement.

https://www.youtube.com/watch?v=anjDQJtWFc8
 
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