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Every loop's got a silver lining..

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saultrader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote saultrader Quote  Post ReplyReply Direct Link To This Post Posted: 07 Jun 2017 at 15:18
Work has hijacked my time over the past few months but I escaped for long enough to finish off the re-jugging operation and it was great to hear her chugging away again, sans smoke and with an acceptable tappet rattle. I've only run her on the bench via a drip feed until I get the tank a bit cleaner inside. My usual method is to chuck in a handful of 6mm nuts, half a gallon of red diesel and either do a Carmen Miranda with her maracas or wrap a towel around it and stuff it into the orifice of an electric cement mixer and open a bottle. As it's only light rust I have been considering substituting diluted phosphoric acid instead of diesel. Bearing in mind that I don't care for internal coatings, has anyone got better ideas for tank cleaning?   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lemsteraak Quote  Post ReplyReply Direct Link To This Post Posted: 07 Jun 2017 at 15:55
If it"s only light rust ,your phosphoric acid (either in cheap form or Deox-C ) is fine and no need to rattle it about, leave it overnight or two nights and rinse,

.Any left over acid make a gin and tonic.
Moto Guzzi 1970 V7 Special
Laverda 1973 GT750
Laverda 1970 SF750
Laverda 1986 RGA1000 Sprint
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Glawster Quote  Post ReplyReply Direct Link To This Post Posted: 07 Jun 2017 at 20:14
Phil,
There's a much better solution to clean the inside of a tank - by electrolysis.
Get some soda crystals from the supermarket (same aisle as the washing powder).  A couple of cupfuls of soda crystals mixed with water and fill the fuel tank.  Make an anode out of a strip of ferrous metal.  Connect it to the +ve of a battery or battery charger and put it in the water through the filler hole.  Make sure it's insulated from the tank.  Connect the -ve from the battery to the tank.  After 24 hours the anode will be as you see below.  Repeat 2 or 3 times until no more rust accumulates on the anode.  The tank will be completely clean and ready for POR 15 treatment.

That Ducati had a class paintjob before I ruined it....

Cheers, Derek


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iceni View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iceni Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jun 2017 at 07:22
Recently done that on my AJS. Worked a treat
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Post Options Post Options   Thanks (0) Thanks(0)   Quote saultrader Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jun 2017 at 17:02
Thanks for that Derek, I know about this method, never tried it but it sounds fun, costs next to nowt and I like stuff that sorts itself out while I'm doing something else. Not, however, a big fan of tank coatings and I've heard about problems with POR flaking. I'd prefer washing out with Phosphoric acid to inhibit any rust that's left after electrolysis has worked its magic.
Why don't you stick a picture of that wonderful V7 Sport of yours on here, I'm sure then others would hate you too!   
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Lee Davis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lee Davis Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2017 at 01:36
Phil... This might be just the trick on ebay: http://www.ebay.com/itm/Moto-Guzzi-Eldorado-850T-T3-83mm-Gilardoni-Piston-Cylinder-Kits-with-Head-Gasket-/302092041129?hash=item465616bba9:g:XrYAAOSwLF1X7rbA&vxp=mtr
Now, I am quite embarrassed to admit (since I am a loopframe restorer),  that I am unsure if these retrofit to your bike or not,and don't know if the Eldorado or later versions are the same as your engine. The newest 850 I have worked on is a 1973. But it sure would be nice if it worked out...    Lee in New Mexico
PS My instinct is to just buy the set and see if it works out... but that may just be the 2 Beefeater martinis talking...


Edited by Lee Davis - 22 Jun 2017 at 01:41
Lee Davis
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saultrader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote saultrader Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2017 at 09:20
Hello Lee, thanks for sharing the Gilardoni advert. This is a long drawn out, 2 year thread but since the saga began I have finally finished the rebuild and the bike is ready to roll. I have three of these wonderful machines and the other two are getting nervous wondering who's next on the bench. Thankfully, my 750 Special already has Gilardoni's but, being yellow, she needs cosmetic work which may well form the basis of another thread.
For those who followed Derek's excellent advice about the electrolysis method of de-rusting a tank, please note that the loop tanks don't lend themselves to this method. The filler extends downwards into the tank, I guess to stop fuel sloshing out of the filler cap, this makes the placing of the anode difficult and not very effective. It's also a bastard to get out the 6mm nuts used in the "cement mixer" method. I may yet take a small rotary saw to this troublesome protrusion.
Anyway Lee, enough of this nonsense, show us some photo's of your bikes!       
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