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Home > Help Needed / General Tech Chat > retapping flywheel puller holes

Dangerous

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Swindon

25th Oct, 2006 at 11:09:47am

Just stripped the thread in one of the holes in my steel flywheel,what would be a good size to tap them out to,with easily available hardend studs (ford headbolts ?)metric/unc /unf ?


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Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

25th Oct, 2006 at 11:10:48am

i've heard of tapping them 1/2" unf

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At the risk of being sigged...

Joe, do you have a photo of your tool?



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Vegard

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Chief ancient post excavator

Norway

25th Oct, 2006 at 11:24:32am

Helicoil!

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

Dangerous

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Swindon

25th Oct, 2006 at 11:38:34am




On 25th of Oct, 2006 at 11:24am Vegard said:
Helicoil!


Yeah right


Will 12.9 rated allan key bolts be up to the job,as they are free from work,but they are all metric so m10 12 or 14


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Vegard

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Chief ancient post excavator

Norway

25th Oct, 2006 at 11:42:38am

What do you mean? I've helicoiled these with good luck previously.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

fastcarl

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leeds/wakefield.

25th Oct, 2006 at 11:59:55am

take them out to 1/2unf,

carl

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Tom Fenton
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25th Oct, 2006 at 12:35:40pm

Standard Metric threads would be too coarse in my opinion, I'd be looking to either source some metric fine (hard to get and taps expensive) or UNF as suggested.

Don't dismiss the Helicoils, I once helicoiled an M11 cylinder head fixing into an alloy block, I didn't think it would work, yet I then tightened it to 40Nm, +300 degrees (e.g. fucking tight) and it worked a treat.


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On 28th Nov, 2016 Rob Gavin said:
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Like fuel 😂😂

Dangerous

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Swindon

25th Oct, 2006 at 01:04:17pm

I didn't think a heli coil would work,On the metric being too coarse,arn't verto flywheels metric or unc ?


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Tom Fenton
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25th Oct, 2006 at 01:17:43pm

Verto flywheels are M10 x 1.5 which IMO is borderline anyway.

However the 3/8UNF thread has pulled out there is unlikely to be enough "meat" there to successfully tap at M10, so you are going to have to go to M12, with pitch 1.75, which IMO is too coarse into the flywheel......


On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
 I refuse to pay for anything else


Like fuel 😂😂

Turbo Shed

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Epsom, Surrey

25th Oct, 2006 at 01:24:28pm

i had mine tapped to 1/2" unf and works fine. i wouldnt bother with helicoil or metric for the reasons given above

Vegard

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Chief ancient post excavator

Norway

25th Oct, 2006 at 01:28:35pm




On 25th of Oct, 2006 at 01:04pm Dangerous said:
I didn't think a heli coil would work,On the metric being too coarse,arn't verto flywheels metric or unc ?


Don't think. Try it, and get experience.

Assumption is the mother of all fuckups.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

matty

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Turbo Love Palace Fool

Aylesbury

25th Oct, 2006 at 02:06:27pm

I agree with Tom, 3/8 and M10 are way too close to just re-tap.

I think it would be best to re-drill to 1/2 unf, same pitch larger area of contact due to the bolt having a larger circumfrance.

Of course you will need to re-drill your pulley aswell to accomadate for the larger bolts.

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25th Oct, 2006 at 06:59:20pm

imho 1/2" unf as well






turbo hogster

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stowmaket suffolk

25th Oct, 2006 at 08:28:45pm

mine is 1/2 unf and then i made adpaters for the puller bolts

always looking for them bigger bunches of bannanas

Dangerous

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Swindon

26th Oct, 2006 at 11:58:45am

News flash


Tapped to m10 x 1.5 as I could do that with engine still in(It's a metty !)

good enougth to get it off

Now I'm thinking why not have 6 puller threads in the flywheel,then you got 2 lots for a std 3 puller on knock up a six bolt puller.

Clutch was still in one piece,but the primary gear had started to sieze on the end of the crank,due to a slight oil leak and some clutch slippage(dust I think)


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