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Tomo.T

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Tomo.T last won the day on October 31 2018

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About Tomo.T

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  1. Plenty Meat Update. The ultrasonic gubbins has recorded wall thickness in the 9's and 10's (mm) with a one off low of 7.8 this is well good enough to fit a standard liner and the pistons will be turned down to suit as was originally intended. This is wonderful news and I was surprised to hear the good thickness readings, which must be down to reduced corrosion on the water side. The only downer is the radiused corners on the piston tops, but that's not going to stop it running and everything else will be as standard. One question, will I need new rings or just re gap the old ones ? The difference in bores will be 20 thou. smaller.
  2. All pistons are marked 30.C on the tops. This should mean +30 thou. Size C, which was the only oversize piston available post war. In fact the pistons measure just under +20 thou. and have been turned down to match worn bores, with their top corners rounded off to avoid the step , ( just visible in the previous pics.) This apparently was common practice in the day. During the war no oversize pistons were supplied and the Army ended up casting their own at Base Workshops to prolong the life of engines. Info; "Auriga" Book of the Thornycroft p.87-89 The plan is therefore to attempt to fit liners to standard size A and turn down the pistons to match. This all depends on the remaining wall thickness, which is due to be measured with an ultrasonic gismo by an ex Williams racing engineer on Friday. Exciting stuff this isn't it ?
  3. More Meat. Went for a piston tugging session at Stan's workshop. The omens were good as No 4 came out by hand after I found the piston was turning in the bore. The others were not so keen so Stan created an impromptu jacking device which was simple, but effective. This comprised a piece of good solid plate bolted through the con rod big end holes and then jacked up with a pair of home made turn buckles underneath. Two large nuts were tacked below the plate to prevent any 'walking'. Each piston in turn was jacked and blocked and gave little resistance once the initial reluctance was overcome. The pistons once cleaned, were in good order with free rings. Bores are good until you get above the pistons, where there is some pitting unfortunately. Further investigation continues.
  4. Ah, not a problem. The originals were painted service green along with the rest of the engine. Once I have checked for porosity I will etch prime and paint accordingly.
  5. That of course, is the million dollar question. However, the stuff has cured to a rock like consistency and a good rub down with 80 grit produced fairly minimal result. I am quietly confident, but will test with deisel before use.
  6. Sump Update. After careful consideration and a failed welding experiment. (Yes it's true, early cast ally does not weld !) I have opted for chemical assistance. Kes produced a first rate blasting job removing all the corrosion with just soda and a very low air pressure. He managed this without significantly enlarging any pinholes. Good Man. At the same time I happened across a bargain pack of Belzona 1111 on eBay. Buy it now it said, so I did. Although rather old, it was still viable, so I spent a few hours honing my sculpturing skills and this was the result. I think I shall call it ' Polished Turd Reclining.
  7. Al, Thanks for the kind words. I am a relatively new boy here, riding on the backs of the true pioneers, who have inspired me to emulate them. Tomo
  8. I also gave the bespoke seat a coat of Service Colour and it now looks less incongruous with its surroundings.
  9. The next task was to remove the cylinders complete with pistons. The water jacket connector was already terminally damaged on this engine, so when the 5/16 W fastening bolts broke off too, I was left with no option but hack sawing through the remains. Fortunately I have been promised a spare from a 'parts' engine in Yorkshire. Thanks John. The Regimental engine lift is proving a very useful item and after some experimenting with lifting strops, I found the best method was to pass a thin strap, doubled over, through the upper water cavity as shown. This gave a nice balanced lift. The cylinders were deposited onto my work bench and as they laid over ( under perfect hydraulic control, ) a surprisingly large quantity of old sump oil ran out over the bench and the floor ! This had obviously been added by the previous owner to help free the pistons. Thanks Ian. Fortunately the L.A.D. has a an amply stocked rag bin and I was able to clean up the mess before anyone noticed !
  10. Photos added from my phone due to my computer's inability to find them !
  11. Well the poor old sump pan has got a bit maggoty, but at least it has kept the internals in good nick. Dropped out the crankshaft today and after wiping oil off the journals I was delighted to see how well they have survived. The white metal bearings are all in good shape and may well be fit for further service. Next mission is to check for wear with a proper engineer, but from visual inspection I am greatly encouraged. Without the crank in the way it is possible to see another interesting early feature of this engine. There are no anti- splash plates fitted and no fixings for them. I suspect this engine was re-badged war stock, sold off to the colonies in the early 20's. This suits me fine and matches the original engine. I am of course following closely the Gosling Gospel according to 'J ' ( which I am finding immensely helpful ! ) and I will be removing the cylinders complete with pistons in order to deal with their extraction separately. By good fortune the pistons are all lowish in the bore, which appears to have suffered light rust only from what I can see. Onward and upward, or downward if you are a piston please.
  12. The blue cotton over jackets started off dark indigo blue but faded with use and boil washing, becoming progressively paler. Very similar items are still worn on the footplates of steam engines. The over trousers are possibly the same material, but they may also be oil skins (water proofs) and your guess is as good as mine as to the colour.
  13. Hmm, Thanks Steve. The chap behind is actually wearing an engineers blue cotton jacket over his rather better fitting service dress. He also has on over trousers. This was to protect the uniform whilst engaged in oily/ dirty tasks and he may well have been a fitter in the unit LAD then known as the First Aid Workshop. John, otherwise a very credible effort which certainly brings the scene to life and I think you have a good likeness of your Grandfather. Tomo
  14. Perhaps I should take a pew and mutter a quick prayer for the sump !
  15. On a happier note my new seat arrived today via Steve Davis of HCS. Steve is a cabinet maker and a long suffering friend ! He has created this high quality piece from drawings kindly supplied by Gosling Restoration Inc. Shown here in position and freshly primed.
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