LCGB Forums

Can you recommend a threaded insert kit for engine casing, horn casting etc. ? Are they available in a range of sizes to suit lambretta (m3 ,m4,m5,m6,m8?) Do I really have to spend £150 plus ? is there a cheaper but good way of doing it. Ive seen some brass inserts are they any good? Any advice and particularly weblinks of where to buy?
Thanks

tv175lambretta wrote:Can you recommend a threaded insert kit for engine casing, horn casting etc. ? Are they available in a range of sizes to suit lambretta (m3 ,m4,m5,m6,m8?) Do I really have to spend £150 plus ? is there a cheaper but good way of doing it. Ive seen some brass inserts are they any good? Any advice and particularly weblinks of where to buy?
Thanks

Helicoils

Most engineering shops will helicoil single threads for you saving the cost of buying a complete kit..

Thanks. I'd thought helicoils were more of a temporary fix than a permanent repair. Have I got that wrong?

I have 2 helicoils in my chaincase,1 of which is in the usual exhaust mounting stud hole.They have been there for 2 years now and still work ok.

Time Serts for professional job.
Costly, but worth it. Or should that be wurth it

I have helicoiled quite a few threads in my cranckcase and they are spot on , try www.unithread.com , they do reasonably priced kits which include the inserts and the tap

i think helicoils like everything have to be used as they are intended and dont expect any more of them.

They can provide a good (home workshop) fix in certain situations but must be installed correctly - a lot of helicoils are the wrong size and/or badly fitted causing failure - thats what gives them a bad reputation.

I think you have to look at the application, the base medium, the depth etc and make the decision which may mean using something more suitable (timesert, welding etc)

I wouldnt be without M6 and M8 kits in the garage - just in case

helicoils fitted properly give a better thread purchase than screwing directly into ally as you are in effect fitting a larger thread with more surface area to grip the ally (we fit helicoils as standard to ally and magnesium jaguar diff housings for mounting brake calipers).