Car mechanics – helllpp!
How long is the threaded hole?Posted 4 years ago
Can you see how damaged to thread is? Any chance of cleaning the damaged thread? If you can, you may be able to get the bolt past the damage to some good thread, but depends how deep the hole is.
Further bodge would be to drill out the tapped hole (all the way) and use a longer bolt with a nut on the other side.sugdenrMember
If the threads on the bolt are damaged too then you will need to fix that also. If the bolt is OK and the hole is only a bit damaged molgrips technique might work, but it usually only works on ally not cast iron. A bolt thread gets max strength with only a few threads so unlikely to be a problem once you fix, its shear force on the bolts, so as long as it tightens up OK you are absolutely fine.Posted 4 years ago
If you haven’t got/cant get a tap and die, try cleaning up the bolt with a fine file and try molgrips idea carefully, dip in oil first, maybe just maybe.
So I was changing the rear shock absorbers on my Touran today.Posted 4 years ago
The last bolt was to mount the shock at the bottom, into the rear hub / carrier.
The bolt has started to cross-thread (maybe first 4 threads) – I stopped as soon as I realised. The hole is a tapped one, into the main hub.
Is there *anything* I can do, other than go find a new hub carrier and bolts etc..?
(and grrr at more VW duff design, as the bolt is too long to easily get in or out past springs…)
If you try and re tap out the hole try and use a 1st tapered tap so it doesn’t follow the knackered first few threads. If it does the hub will be scrap. You really need a 1st 2nd then plug tap. I would be surprised if halfords has one of those.I would drill out the first few knackered threads, if there is only 4 cross threaded threads I wouldn’t worry.Posted 4 years agopacerc200Member
I’m failing to see how you trying to carry out a job incorrectly and stripping threads is a duff vw design.
Take the outer spring pan bolt out, remove spring, flex pan down and you will have straight access to the bolt, start the bottom bolt first make sure it looks to be straight and you might just catch an original thread.
You have to be good/lucky to get it right with the spring in place. Wishing you good luck.Posted 4 years agoTreksterSubscriber
Any tool hire shops around?Posted 4 years ago
Tap hole as others have said, use cutting fluid if possible or oil to lube tap. If doing it yourself make sure you work the tap in using small turns back and forth, back and forth. Same with die, don’t be tempted to screw all the way in a oner… It may jam and break!!!
Die to clean up bolt = all sorted 😆
Would not be too keen to use the heli coil idea
Cheers all.Posted 4 years ago
pacerc200 – I tried removing that bottom member / pan, however every bolt is seized tight on both sides. On the other side (that went really simply), the bolt I am referring to I had to soak in release spray, then use a jack to lift end of spanner – it actually lifted car up off the stands before releasing…
Starting to see why all the garages wanted £400+ for the job 🙁
First rule of home mechanics.
3 ft long half inch drive breaker bar and face drive sockets.
Spanners wont shift anything thats been in there for a few years on our roads and multi point heads on ring spanners round bolts for fun ( based on my experiance with 26 year old land rover and 14 year old frontera.)Posted 4 years ago
Matt – The Scrwfix in Stirling have a couple of tap and die sets in e.g.
They are open 10-4 tomorrow herePosted 4 years ago
Or this looks like a better set – http://www.screwfix.com/p/hss-steel-tap-and-die-set-51pc/12834
Or this one from Halfords (also in stock in Stirling) http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_236397_langId_-1_categoryId_165572Posted 4 years ago
Nothing wrong with helicoils but they can be tricky to insert. A first tap should be fine. Don’t use any oil or cutting fluid you don’t need it for cleaning the thread out. It may also affect the bolt torque and you don’t want that bolt loosening off. If you have to, put some copper grease on the shoulder of the bolt as that is where it will stick.You really don’t need a new hub it will be fine, trust me I have repaired far worse and never had a problem. You are to be commended for having a go. The whole exercise is to save money.Posted 4 years agotakisawa2Subscriber
4 threads of a M12 is 7mm out of the 50mm you reckon is in there. Just get a 12mm drill & take the first threads out, a few mm at a time.Posted 4 years ago
And it’s a big drill, you don’t want the thing spinning at max rpm.
Hold the drill nice & steady, & in line with the hole.
You could grind down a bolt so it’s a 90deg quadrant, & pop it down the hole, engage the thread & try working it outwards. Tricky but it’s worked before.neilb67Member
Matt, If it the same as the Golf/Scirocco its a metric fine thread. Ive crossed threaded these loads of times on our race cars. When mounted in the car the angle that it is tapped is a lot steeper than you think. The proper bolt has a lead on the end to locate it and make it easier to start. I know it sounds brutal but we just get a bolt with a longer lead and drill out the first few threads. Where are you based..?Posted 4 years ago
I am in Dunblane.Posted 4 years ago
It is at an odd angle to the casting – and yes had a lead. On the other side, i just had to jack up the suspension *slightly*, then hold the new shock compressed and in line – a bit of wiggling, a few ‘missed’ stars and away….
Nowhere in Stirling has an M14 bolt or tap n die set, so day off tomorrow to sort it out.
Whooooooooop. We’re done and on.Posted 4 years ago
Last attempt at clearing start of threads on hub carrier and suddenly a perfect wee coil of metal dropped out, so gave it a go with the cleaner up bolt.
Phew, and still a good few quid saved. We did not have luxury of garage vs weekend. ..
Good news that matt, saves doh.
I had to resort to the good old universal rotary spanner removing my body mount bolts today they were not for shifting at 15 years undisturbed !
Got the oil sensor changed and the oil + filter and air filter done this morning thought 🙂Posted 4 years ago
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