12 replies to this topic

[olly33]

Hi all,bit of advice needed to what may of cause this bolt to strip/shred quite badly.

 

Taking my verto clutch/flywheel out due to hopefully quite a big leak from the primary gear oil seal. 

Had to use a breaker bar to shift the nut,but once the initial first turn,the bolt was still mega tight and needed the breaker bar to completely remove the bolt.I now see why,it was tight as the thread is shredded 3/4 the way,but what would cause this to happen?

 

Car was running ok through the gears,no clutch trouble,but the lock tab washer that is welded to the bolt was by the looks of it,not bent over at all and the washer was actually loose and had come away from the weld on the bolt when I removed it.

Cheers 

[GraemeC]

I'd suspect a previous clutch change has damaged the thread In the end of the crank and then the bolt has been driven back in by a hairy arsed fitter using a windy gun.

[greenwheels]

Is the thread in the crank OK?

[Spider]

I'm not super familiar with the Verto Clutch but I know they had a different bolt fitted compared to earlier types.

 

None the less, looking at the head on that bolt and a few photos I have of others, is that the correct bolt?

 

The thread on these is very odd-ball. If someone has slipped in a UNF Bolt, that would certainly explain it.  The correct bolt will have 16 threads to the inch, a 5/8 UNF (same diameter as the original) will be 18 threads to the inch.  Also, the originals (and I think it followed through with the Vertos) are 1-1/2" AF  for a 5/8" UNF Bolt, it's usually around 15/16" AF.

[GraemeC]

I think it is the correct bolt, although originally the cupped washer would've been spot welded to it (can see the remains of the weld).

[Spider]

I think it is the correct bolt, although originally the cupped washer would've been spot welded to it (can see the remains of the weld).

 

Ah, OK.

 

What's the AF size of them?

[olly33]

It is the correct bolt from what I gather,as minispares state that the mini all had 5/8 16 whitworth,verto and non veto.Only difference I can see is the hex head is quite a bit smaller on the verto plus the welded on washer?
The thread in the crank was fecked, but have retapped it with a 5/8 tap,and a test with the good non veto bolt seems to thread in fine all the way.
Also the bolts are the same length from what I have here!

Edited by olly33, 02 February 2016 - 09:30 PM.

[GraemeC]

I think it is the correct bolt, although originally the cupped washer would've been spot welded to it (can see the remains of the weld).

 
Ah, OK.
 
What's the AF size of them?

They're a pesky 30mm

[MRA]

Please allow me to put this straight....

 

AF means Across Flats and does NOT signify the type of thread nor whether it is imperial or metric.

 

The thread is indeed 5/8 x 16 Whitworth, this is a special thread and was first used on the A series in 1948 when Whitworth were quite popular in the UK.

 

Minispares Centre London also sells the correct taps to help to rectify slightly damaged threads in either end of the crankshaft,

 

http://www.minispare...|Back to search

 

30mm AF bolts are Rovers attempt to bring them into the 19th century

 

Definitely agree with the "hairy arsed spanner basher" using the biggest tool in the box .... himself !

[MRA]

It is the correct bolt from what I gather,as minispares state that the mini all had 5/8 16 whitworth,verto and non veto.Only difference I can see is the hex head is quite a bit smaller on the verto plus the welded on washer?
The thread in the crank was fecked, but have retapped it with a 5/8 tap,and a test with the good non veto bolt seems to thread in fine all the way.
Also the bolts are the same length from what I have here!

 

What did you use ? 

[dklawson]

The thread in the crank was fecked, but have retapped it with a 5/8 tap,and a test with the good non veto bolt seems to thread in fine all the way.

 

You had the correct tap?  As mentioned above the thread is 5/8-16 with the 55 degree Whitworth thread form.  Standard taps and bolts are not correct here.  What did you use?

[olly33]

As stated a 5/8" 16 tap. ?

[olly33]

Minispares 63 quid? what the hell

Can anyone confirm which way the clutch plate goes against the flywheel. One side is obviously slightly deeper where the hub spline sticks out further,as I have an issue that is a right pitta,which I think is the clutch plate is on the wrong way,or I slid the release bearing on the wrong way?
Clutch is biting right near the floor,and the throwout stop has had to be moved way to near the end of plunger to stop a solid pedal on initial first press,and to top it,a rough squeal on pressing clutch pedal(replaced new bearing on refit).
Cheers olly

Edited by olly33, 18 February 2016 - 11:08 PM.