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 Post subject: 1275 Auto Rebuild
PostPosted: Sun Jun 23, 2019 11:11 am 
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Location: Brisbane QLD
Well this went from a quick clean up to a rebuild very quickly. But, upon inspection of the original engine we found a but of a lip in the bores..soo
I pulled the engine to degrease and inspect. And it has led to this ...haha
I split the block on Friday and have it sitting in the tank for the weekend . Will overbore it on Monday and order new pistons and rings. The original Mowog pistons had some slap marks on them.
Crank is standard. In real good condition.

Will also refresh the auto box. ( I have just always want an auto a series) they are getting rarer now so will be an interesting experience into the world of the AP2 box.
JPAT in the UK still sell the rebuild kits for the and I will consider doing the clutch upgrade mod on it after I inspect the boxes condition.
Shout out to Peach Performance here in Brisbane . Geoff is letting me use all his gear and they are a top bunch to work with. Geoff machined my Deluxes engine 6 months ago as they are 2 mins from my house its very convenient.

We were jokingly talking about turboing the engine givin the low compression ... but i think I will leave that alone for the moment !
I need to focus on getting these cars on the road! That’s were the fun is.
ImageImageImage

Always having to cop mouthfuls from the horsepower heroes around here , but as I remind me them it’s not how big it is, it’s how u use it!

Image


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Mon Jun 24, 2019 1:26 pm 
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that's a large journal crank, you could stroke it, just need some small journal rods and a bit of machining

simonw wrote:
it’s not how big it is, it’s how u use it!


what if it's big AND you know how to use it?

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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Mon Jun 24, 2019 4:43 pm 
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Standard crank . Some new bearings and off we go !


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Tue Jun 25, 2019 8:48 pm 
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Ordered the rebuild kit for this little beauty today.

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Bit worried about this gear face though ...


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Wed Jul 03, 2019 6:33 pm 
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Dismantle was quite straight forward...its always the putting back together that’s more challenging right? :)

ImageImageImage

Kit arrived .
Some of the old plates were delaminating . I think I might need to get the brake bands rebonded as they are not in great condition .


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Wed Jul 03, 2019 6:54 pm 
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That plastic sleeve on the nose of the forward clutch acts as a ring compressor when you assemble the box. Otherwise the two sealing rings on the nose can get broken. You fit it over the rings and it pushes along as you refit the cover.

The manual shows a jig for locating the oil pipes, you can get around it by using a bit of stiff wire and a screwdriver to move the pipes around and feed them into the cover.

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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Thu Jul 04, 2019 7:51 am 
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Morris 1100 wrote:
That plastic sleeve on the nose of the forward clutch acts as a ring compressor when you assemble the box. Otherwise the two sealing rings on the nose can get broken. You fit it over the rings and it pushes along as you refit the cover.

The manual shows a jig for locating the oil pipes, you can get around it by using a bit of stiff wire and a screwdriver to move the pipes around and feed them into the cover.


That’s brilliant information ! Thank you so much , was wondering about those.


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Thu Jul 04, 2019 7:04 pm 
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Hi, I think its been apart before, as its not an original idler gear bearing, never split rollers then, and I personally put the bearing in the other way I would put a groove in that face to try and get more oil in there, and to me most of the marks look like corrosion as if its sat for a while. Clean it up with wet and dry, and I think it will be fine with new idler bearings (get Japanese)
cheers Lindsay

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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Tue Jul 09, 2019 1:53 pm 
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ImageImageImageImage

Looking for suggestions on this please.
It looks like the thrust on the idler was not set properly.. very hot bearing and thrust washer are cactus .. see photos .
The thrust surface on the case and the cover have been affected to, so looking at milling options .
Are thrust available on different sizes ? And is the idler in the auto different to manuals ?

Thanks heaps


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Wed Jul 10, 2019 5:29 am 
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I have fixed this problem on manual boxes by milling an equal amount from original thrust face and housing face. But check it won't creat a problem elsewhere.
No, the idler gear is different from a manual one.

You could also get a machine shop or toolroom to make thicker thrust washers, using same material and heat treatment.

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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Wed Jul 10, 2019 1:59 pm 
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Thanks Doc . Just need the confidence to go down that road . Will mill the faces up a tad and see what thickness washers I will need .
As these boxes are getting harder to find in good nick it’s been interesting learning ways to fix rather than replace .


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Sat Jul 13, 2019 10:51 pm 
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Very interesting project with great pics, keep it up.


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Wed Jul 17, 2019 9:52 pm 
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Location: perth w.a.
Hi mate been following this thread with interest as I have a auto box due for a rebuild. What's the diff ratio is this is it 3.27, what the number of teeth on the diff and pinion?
Thanks


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Thu Jul 18, 2019 6:06 pm 
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That’s great to hear Mitchell.
Sorry I haven’t pulled the diff out . So i cant tell you ....well i suppose I can have a crack at counting the teeth ..
Watch this space.
I think it will be type standard as per Workshop manual specs



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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1275 Auto Rebuild
PostPosted: Thu Jul 18, 2019 6:12 pm 
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Let the fun begin.
The case has been machined so I’m just left sort the thrust clearances out for the idler .
Pretty sure i will have to get machined up some new washers.



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Simonw
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1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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