Thread repair

[cash1000]

I've got 3 bolts in tappitt covers on my RM that the threads are stripping out. As these bolts are being taken out each time I do valve clearances I'm thinking a Time-sert thread repair is the way to go rather than helli coil as they are stronger. What size do I need?

 

[docc]

M6 X 1.00 thread pitch

[cash1000]

Many thanks Doc.

I want to order kit today and forgot to bring bolt to work

 

[MartyNZ]

I have a box of helicoils to do the job if you are stuck. Not as good as Timesert, but still work ok. And you can have them NOW if that is important. 

[cash1000]

Hi MartyNZ

I won't have time this weekend so no panic. But many thanks for the offer

Time sert is not cheap. Best price I've got is $220 for kit. That's from Wurth with works discount. Rep trying to get me a better price (Fellow motorcyclist)

Will be worth it if I have to end up  replacing all 16 threads!

[gstallons]

I have Time=Sert , Heli-Coil and a kit from Fastenal . For this the heli-Coil would be fine .

[Rolf Halvorsen]

Correct assembled Helicoil thread is the simplest and best way. When you insert it deep enough, it will prevent to be unscrewed. The top surface will not be changed.

[cash1000]

Thanks guys for the advice. I surpose torque on these bolts wont be that much so helicoil is way to go.

[sp838]

7 hours ago, cash1000 said:

torque on these bolts wont be that much

10 Nm total with a little blue loctite is all you need, tighten them in progressive amounts equally in a more or less star pattern across the cover. 

[docc]

Seems the sump fasteners are the same M6x1.0 as the valve covers.  One of my fourteen pulled its threads out.

I have the correct "HeliCoil" ("Recoil ", made in Australia), but not the special "STI" tap to install them. Is that special tap a must?

[Chuck]

Not necessarily the same manufacturer, but definitely the correct pitch diameter and pitch. 

[bbolesaz]

If you are helicoil-ing a block, you need a bottoming tap, not a tapered tap.  The tapering tap can be helpful to cleanly cut the 1st couple of threads at the top of the hole, then finish in with the bottoming tap.

[bbolesaz]

BTW, I would use Time-Serts over HeliCoils.

https://www.timesert.com/

[Kiwi_Roy]

I used Helicoils on my VII Sport tappet covers, most of the holes are not blind,

They make a job that's better than original.

[gstallons]

I'm THE authority on ruining things . Get the Heli-Coil and practice on some junk til you feel confident in what you're doing . It's easy . If a Simpleton like myself can do it , you can too !