1968 780 Rebuild (lots of photos)

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dsk
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1968 780 Rebuild (lots of photos)

Post by dsk » Thu Jul 01, 2010 11:53 pm

Thought it was time I introduced myself a bit better. I used to run the Scottishmini forum so I am in the habit of posting lots of photos. hope that works OK on here.

My life story so far... :P
I can remember sitting on a 30D but the 770 selectamatic was the first tractor I learned to drive.

As a farm we had a lot of David Browns but the one I keep coming back to is the 880.
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As the engine needs a rebuild I bought a "spare" 880 with a good motor.
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Doing a little research I found out how easy it was to get parts and I got interested. So I went and did a deal for a 780.
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Since then I have been doing some exploring to see how bad things are and what parts I'll need. Cleaning a lot of crud off the outside before I split her open. This one will be all kinds of shiny when I am done. I intend to take my time and do a full restore. Then this one can take over some of the duties from the 880 while she gets a rebuild.

One of the obvious things that expected would be high on my list was drop arms since the originals were all kinds of bent and busted.
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But I have spent twenty years playing with old minis and I always love how easy it is to work on tractors.
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I know thats not the same one but they both cleaned up quite successfully.
I am not going for a show standard tractor in absolutely standard spec. There are a few period modifications I want to include. Twin speed PTO, Alternator, non standard tyres, those sort of things.
Last edited by dsk on Sat Aug 14, 2010 11:12 pm, edited 1 time in total.
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dsk
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RE: 1968 780 Rebuild (lots of photos)

Post by dsk » Sun Jul 04, 2010 9:26 pm

This spent its last working years, rather predictably, as a scraper tractor. So it's not going to be "as new" but this is what the Towbar looks like after a week in molasses.

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I take it out every day and pressure wash it before putting it back in again. I have had cast iron clean up almost overnight but good quality steel takes a bit of work.

I really need to get a shot blasting kit.
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denbute
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RE: 1968 780 Rebuild (lots of photos)

Post by denbute » Sun Jul 04, 2010 9:37 pm

What is molasses and how does it work?
That piece cleaned up very nice.

You can probably achieve this by sandblasting too but the equipment is rather expensive if you want some capacity. Plus the labour involved, I don't know, maybe your system is easyer.
<b>1964 David Brown 880 Implematic sn: 880C357040 4 cylinder
197? David Brown 1210 sn: 1210/1/728679
1978 David Brown 996 sn: 995/6/11083514

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dsk
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RE: 1968 780 Rebuild (lots of photos)

Post by dsk » Mon Jul 05, 2010 12:02 am

Treacle
mélasse?

If you want the technical explanation, search for "chelating agent." But there are a few sites like this one here which show its use.

This was a mini clubman cylinder head that I left only half in solution overnight just for a demonstration.
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There are chemicals that can be bought which do the same job more efficiently. I used one of those for the bores of an engine that water had entered and rusted, so as not to damage the alloy pistons. I will post the photos of that one later.
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mitch
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RE: 1968 780 Rebuild (lots of photos)

Post by mitch » Mon Jul 05, 2010 1:12 am

Molasses is a byproduct from sugar cane processing. Queensland has loads of sugar cane hence plenty of molasses and Rum, our favourite drink. Molasses is also cattle food. Didn't know of its rust removal properties though.
non-Q 1975 1210 2wd
model# 1210/1 728931
engine# AD4/55A 26193

1975 1412 2wd
model# 1412/1 1050623
engine# 455011 120673

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RE: 1968 780 Rebuild (lots of photos)

Post by Guest » Mon Jul 05, 2010 6:39 pm

I know that if you consume molasses yourself it will clean out your innards good. Everyone else should stand well clear when it starts working!

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dsk
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RE: 1968 780 Rebuild (lots of photos)

Post by dsk » Tue Jul 06, 2010 9:32 pm

780 drawbar frame sitting next to an 880 frame.

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The 780 frame must be half the weight of the larger one but I am a bit disappointed that there is not the same option for a shorter drawbar.
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dsk
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RE: 1968 780 Rebuild (lots of photos)

Post by dsk » Fri Jul 09, 2010 9:40 pm

Took the brake pedals and links off today. Going to need new rods. Need I say that this lot is a little bit seized.

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simonwill69
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Re: RE: 1968 780 Rebuild (lots of photos)

Post by simonwill69 » Fri Jul 09, 2010 9:48 pm

Powerrabbit wrote:I know that if you consume molasses yourself it will clean out your innards good. Everyone else should stand well clear when it starts working!
LOL

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simonwill69
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RE: Re: RE: 1968 780 Rebuild (lots of photos)

Post by simonwill69 » Fri Jul 09, 2010 9:54 pm

The Romans used honey to heal the soldiers wounds too, PR !

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RE: Re: RE: 1968 780 Rebuild (lots of photos)

Post by Guest » Fri Jul 09, 2010 11:05 pm

And used their dogs to lick off the honey as dogs tongues have antiseptic properties which aided the healing process and further cleaned the wounds, no, not joking! They use sterile maggots in hospitals now to clean out infections so there's nothing new. No flys on me you know!

Getting back to the topic, seeing all that rust dsk, begs the question to be asked, how deep in the ground was the tractor burried when you dug it up?

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dsk
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Re: RE: Re: RE: 1968 780 Rebuild (lots of photos)

Post by dsk » Sun Jul 11, 2010 3:37 pm

Why restore something if it isn't rusty? :)
In theory there are many places that should be every bit as bad as us for rusting, but I have not been to any. However I had really hoped that the rust might be contained to the outside of the tractor.
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Can someone please send me a photo of how the fuel pump should look. I would like to see how all the springs and cables started life.

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dsk
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RE: Re: RE: Re: RE: 1968 780 Rebuild (lots of photos)

Post by dsk » Wed Jul 21, 2010 1:13 am

Had a minute or two today so I thought I would see how the pedals looked. Gave them a pressure wash and painted it with some acid just to stop the wet metal from oxidising again immediately.
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Quick blast of heat and everything now moves freely too. I even got what was left of the grease nipple to unscrew ok.
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John_Allen
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RE: Re: RE: Re: RE: 1968 780 Rebuild (lots of photos)

Post by John_Allen » Wed Jul 21, 2010 8:36 am

Sorry, it's a bit low resolution, but you can more or less make it out! It was taken a long time ago - the tractor is nearly finished now.

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dsk
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RE: 1968 780 Rebuild (lots of photos)

Post by dsk » Wed Jul 21, 2010 11:39 am

that is great, thanks.
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