Which model Thwaites is this?

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cobbadog
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Re: Which model Thwaites is this?

Post #11 by cobbadog » Tue Apr 02, 2019 7:27 am

Yes, the acid use is super corrosive and only used as a last resort by me on that small engine.
Fowlerman that is a good idea as it may not be the pistons stuck it may be a bearing gone and that might be holding the piston in place.
Cheers Cobba


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SiH
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Re: Which model Thwaites is this?

Post #12 by SiH » Tue Apr 02, 2019 8:07 am

Thanks fowlerman and cobbadog, damn good idea. I’ll give that a go, but I may well have to take the engine out to get access to the side panel first. I know the winget site ,-useful stuff on there, from when I had a big old 3 tonne winget years ago, beast of a thing with hi/lo box, wish I’d kept it too! Funnily enough, I have the ST Manual on my screen now, thanks FM.
I did actually stick half a cupful of acid down each bore yesterday, left for around 40 minutes before I wimped it and flushed out with 2 buckets of water, then stuck some coke back inplace. You could see where the acid had cleaned the bore,just above the pistons,but it still sat there and cleaned the sludge off the top of the pistons too, so hopefully little more damage was done! The engine is still solid though, no movement at all, even with a set of stillsons on! But I’ll get there. Thanks fellas. :)


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SiH
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Re: Which model Thwaites is this?

Post #13 by SiH » Fri Apr 19, 2019 7:22 pm

Evening all,
Quick update for you as I did a bit on the engine today. Took off the side panel, and luckily it looked good in there, with metal surfaces shiny still. Feeling with my fingertips up into the bore below one of the pistons , and it felt like pebble-dash, raf! Also took off the gear housing, where more water came out, but all in good nick apart from the top of one of the pinions/cogs, where it had been out of the wet and in the air rusting, but cleaned up pretty easily.
Looks like I can get to the nuts on one conrod,and possibly the other but not too sure yet. Thinking about heating the bores up with a gas torch to help break the rust and maybe free it a little. Have a good Easter folks! :)


cobbadog
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Re: Which model Thwaites is this?

Post #14 by cobbadog » Sat Apr 20, 2019 5:32 am

Keep having fun in getting it to let go. Persist and you will win! Enjoy your Easter as well, I am serving Lorry the truck for toys and fiddling about fitting lights onto the mudguards of the Cropmaster restoration job.
Cheers Cobba


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