× 1-800-946-2642 Home My Account Social / Forum Articles Contact My Cart
Shop Now
Select Your Car Type Sale Items Clearance Items New Items
   Forum Width:     Forum Type: 

 Posted: Feb 23, 2017 01:01AM
Total posts: 45
Last post: Jun 19, 2018
Member since:Jul 6, 2016
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
Alright. I will update this weekend and see how things go. Thanks everyone for the quick help!

 Posted: Feb 22, 2017 04:55AM
Total posts: 9241
Last post: Aug 17, 2023
Member since:Jun 5, 2000
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
US
The metric bolt you found is probably a standard M6x1 which will look similar to the 1/4-28.  Thankfully M6 is slightly smaller in diameter than 1/4" so you probably won't have a tapped hole issue requiring chasing the old threads to clean them up.

Try a 1/4-20 as things are now.  If the bolt starts to bind badly, then chase the old threads in the gearbox.  Don't use a tap and remove material if you don't have to.

Doug L.
 Posted: Feb 21, 2017 09:38PM
Total posts: 45
Last post: Jun 19, 2018
Member since:Jul 6, 2016
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
thanks everyone!, I'm going to try a 1/4 20 and 1/4 28 and see if what fits best. I'm sure the threads are probably not in the greatest shape because someone smashed a metric bolt in the hole. If need be I can run a tap in it.

 Posted: Feb 20, 2017 08:22PM
mur
Total posts: 5840
Last post: Nov 1, 2019
Member since:Nov 12, 1999
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
Coarse thread 1/4" for reasons mentioned above. This was just removed from a late 1970s rod change box that shows no signs of ever having been opened up.

 Posted: Feb 20, 2017 04:23PM
Total posts: 1404
Last post: Jun 21, 2018
Member since:Oct 8, 2013
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
Quote:
Originally Posted by Jemal
If it's the little bolt that clamps the speedo housing pinion, it's actually 1/4-20....  Just about all threads into aluminum are SAE coarse!  There's usually an exception.... the pre-Verto stop bolt is 1/4-28!

And yes, the Mini started out standard SAE thread throughout.  80s components that were sourced in Europe, like the Verto clutches went partly metric by Euro law!
I just went and checked two of my cores....................1/4 28 on a Pre A+ and Metric On a A+ so I would think your is a stock metric bolt?

Mini's are like buses they come along in a bunch

 Posted: Feb 20, 2017 04:05PM
Total posts: 1087
Last post: Sep 15, 2023
Member since:Nov 3, 2011
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
US
If it's the little bolt that clamps the speedo housing pinion, it's actually 1/4-20....  Just about all threads into aluminum are SAE coarse!  There's usually an exception.... the pre-Verto stop bolt is 1/4-28!

And yes, the Mini started out standard SAE thread throughout.  80s components that were sourced in Europe, like the Verto clutches went partly metric by Euro law!

 Posted: Feb 20, 2017 03:48PM
Total posts: 45
Last post: Jun 19, 2018
Member since:Jul 6, 2016
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
thanks !!

 Posted: Feb 20, 2017 12:29PM
Total posts: 1404
Last post: Jun 21, 2018
Member since:Oct 8, 2013
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
1/4 28 UNF
 

Mini's are like buses they come along in a bunch

 Posted: Feb 20, 2017 12:27PM
Total posts: 45
Last post: Jun 19, 2018
Member since:Jul 6, 2016
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
When i purchased my 79 mini, it was missing the bushing that goes over the speedo pinion inside of the speedo pinion housing. The speedo was reading incorrectly. I purchased one of those bushing and put it in and found that the single bolt that holds the housing on is metric. and the threads were not in great shape. I do believe the bolts on the mini should be standard. i would like to refit the correct size bolt into the housing. Is their anybody that knows what the correct size would be . 

Thanks!
John