SOHC.co.uk Forums > CB750

Jock AKA BobTheBuilder's K0

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bobthebuilder:
Thanks again guys and Ash has come up with a great idea, but by the time I have finished it there might not be any one left on Sky who would know anything about it, I have heard of riders in there 70's and I think one in 80's but doubt if I will be one of them. Do any of you know any products that would eat rust,  main bolt through engine and many more parts are seized solid with  rust and whatever, :'(

Jock

AshimotoK0:
See my earlier post  http://www.sohc.co.uk/index.php?topic=2398.0

However, for rusted bolts in the frame then probably heat and penetrating fluid. Be careful not to crack the engine mounts as I got a parts bike (K7) and a spare set of cases which had damaged engine lugs. I was lucky, as most of my engine bolts had been replaced with studded bar which did not seize (had to buy new bolts though!!).

You probably know already Jock but the sister US site has a wealth of postings on it. I just wish that 'Hondaman' on it would get his book finished!!

mick:
Hi Jock, thats going to keep you busy for awhile  ;)i remember this one on ebay, my frame number is 1031114 & was originally delivered to Holland i think, so they could have been in the same batch? good luck with your resto keep us posted  ;) cheers Mick.

Seamus:
I have used a mix of brake fluid and petrol to ge into tight rusty spots. Brake fluid seems to work better than stuff like WD40.

I believe that Coke (cola) is also very good at freeing up rusty bolts. Something to do with the acid content (phosphoric I believe).

Bolts through the engine may rust to any spacers (steel) first, but looking at this one, there could be lots of aluminium corrosion holding the bolt. May be worth trying to rotate the bolt/spacers independantly.

Bash it gently after a good soaking  ;D

Good luck

Seamus

Spitfire:
The key to removing siezed bolts is patience, penetrating fluid, heat, mechanical shock (big hammer) all have their part to play but time is required. Also rmove the bolts from the bottom first, otherwise the weight of the engine will be on the long bottom bolts, get them out first, or remove the top ones, lubricate them and put them back in place.
The longer bolts are getting rare now.

Cheers

Den

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