helicoil
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- BXpert
- Posts: 327
- Joined: Wed Sep 12, 2012 11:46 pm
- Location: Warwickshire
helicoil
anyone had to helicoil a block before, was putting my new head on yest and using my torque wrench it went pop and one head bolt now not biting,
GREAT
8 months without my valver now.... crying on a daily basis.
GREAT
8 months without my valver now.... crying on a daily basis.
93 ZX Volcane TD
03 Xsara VTR - HDI (remapped to 140bhp)
92 BX 16v phase 2 - now sold
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03 Xsara VTR - HDI (remapped to 140bhp)
92 BX 16v phase 2 - now sold
93 BX 17TGD - now sold
- Jaba
- 1K Away
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Re: helicoil
I have never had the pleasure but I have heard others say it can be done. Obviously the front side is easier to get at.
Which means that as yours is a BX it is one of the rear ones failing to tighten .
Which means that as yours is a BX it is one of the rear ones failing to tighten .
The Joy of BX with just one Citroën BX to my name now. Will I sing Bye Bye to my GTI or will it be Till death us do part.
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- BXpert
- Posts: 327
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Re: helicoil
Have used thread kits on small stuff before but I'm in two minds on a head bolt. Although what other option do I have.
93 ZX Volcane TD
03 Xsara VTR - HDI (remapped to 140bhp)
92 BX 16v phase 2 - now sold
93 BX 17TGD - now sold
03 Xsara VTR - HDI (remapped to 140bhp)
92 BX 16v phase 2 - now sold
93 BX 17TGD - now sold
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- Over 2k
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Re: helicoil
Had a lot of success with helicoils and highly rate them but I suppose with a block it will depend how close to a sidewall or water jacket it will be?
Kevan
1997 Mercedes C230 W202
2003 Land Rover Discovery Series 2 Facelift TD5 - Daily driver / hobby days and camping.
1993 Land Rover Discovery 200tdi Series 1 3 door - in need of TLC
2020 Fiat Panda 4x4 Cross Twin Air.
1997 Mercedes C230 W202
2003 Land Rover Discovery Series 2 Facelift TD5 - Daily driver / hobby days and camping.
1993 Land Rover Discovery 200tdi Series 1 3 door - in need of TLC
2020 Fiat Panda 4x4 Cross Twin Air.
- mat_fenwick
- Moderator
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Re: helicoil
My understanding is that they should be stronger than the original threads, but like Kevan suggests, it may be something other than the thread which is the limiting factor. I've never used them for a head bolt so can't give a more definitive answer!
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Re: helicoil
I only ever helicoiled the spark plugs on my yam rd350 some years ago but they seemed good at what they do some 30k later still good after many plug changes, but, again, never done a block, cant see why not as that's what they are for is'nt it? have a googly and see what your up against.
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Re: helicoil
We used to have the same problem on AX1.4D with threads pulling out of the block, we used steel thread inserts and never had any problems.
Re: helicoil
I have used them once, and it was the most surprisingly brilliant things I have ever bought. The only hard part might be drilling out that thickness of thread, and then cutting the thread for the outside of the helicoil. I did a 2CV inlet manifold thread and the cutting required some care, and force, and that will be dramatically more with a wider head bolt thread I think, but should be doable.
- Thread Bear
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Re: helicoil
I take it a step stud is of no use as this can be made an almost permanent fitting. Although a well fitted thread should work I always worry they will back out next time the thing is undone. A problem not to be contemplated.
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Re: helicoil
I would argue that it's very easy to contemplate this problem, given that firstly it might be OK, secondly, you intend your head gasket to last many thousands of miles and many years, and thirdly because if it did come out, you'd just fit another one.
- Thread Bear
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Re: helicoil
How do you get a half unwound insert with the bolt in and with the cylinder head still attached off the block? I have not had that particular prob but I have had failed inserts on casings and other things on restored cars bought in. 'Tiz good fun. If I contemplated longevity of repair, then this is someone else's problem, I suppose. Any way it is my fear and not, probably, reality, especially done correctly. I do like step studs though as they can offer a better answer with the load spread further. No good if the fastener is meant to stretch, though.
Miguel - 16 TRS Auto S, light blue, 43k miles - £450
Pluto - 14 E S, White, 105k Miles - in work
Egbert - 19 16v Gti, White, A/C & Leather, - Keeper
Walt - 17 TZD Turbo S, graphite, 70k miles, good op extras - Keeper
Scraper- 17 TZD Turbo E, blue, 208k miles - parts
Homer - 19 TXD E, Red, 189k miles - £250
Gary - 17 TZD Turbo E, 118k miles - in work
'87 Trooper, Borgwards, Saabs, MG ZB, Bellamy Trials, Fiat Jolly & Bianchina, Goggo Dart, Messerschmitt, Heinkel, Bubblecars
Pluto - 14 E S, White, 105k Miles - in work
Egbert - 19 16v Gti, White, A/C & Leather, - Keeper
Walt - 17 TZD Turbo S, graphite, 70k miles, good op extras - Keeper
Scraper- 17 TZD Turbo E, blue, 208k miles - parts
Homer - 19 TXD E, Red, 189k miles - £250
Gary - 17 TZD Turbo E, 118k miles - in work
'87 Trooper, Borgwards, Saabs, MG ZB, Bellamy Trials, Fiat Jolly & Bianchina, Goggo Dart, Messerschmitt, Heinkel, Bubblecars
Re: helicoil
I'll confess my ignorance - I had to Google Step Studs - an even better idea for this application perhaps.
- citsncycles
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Re: helicoil
I've had success with helicoils before on a variety of applications, but have also had issues where the material I was trying to fit it in was poor quality. I'd also recommend buying a good quality kit - the drills and in particular taps in the cheap kits just aren't up to the job.
Mike Sims
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BX 17RD MK1 - it called to me!
BX14 TGE, - SOLD
XM Turbo SD,GS Club Estate,Visa 17D Leader,HY Pickup,Dyane Nomad,Dyane 6,2CV AZL,Falcon S,Trabant P50,3x Land Rovers (88" series 1,109" series 2a FFR,series 2a Marshall ambulance),DKW F7, Lambretta LD150 x 1.5,Mobylette SP93,Ural Cossack,Ural M63,CZ 250 Sport,Honda Varadero 125,lots of bicycles & tricycles including (but not only) Sunbeams,Higgins & Bates!
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Re: helicoil
How far down the block are the threads?
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability
- JayW
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Re: helicoil
We used Helicoils on HGV headbolts and TMK non of them have failed. As you can imagine, some of these are are torqued down a tad more than the average car!
If fitted correctly, they are brilliant.
If fitted correctly, they are brilliant.
I have zero patience for your tedium.