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There appears to be some corrosion within the gear train so try soaking the shafts/bearings/gears with release oil overnight.

Hi Minh Your drawing shows a marine trunk piston engine with blast injection. Blast injection is achieved by supplying the injectors with a low pressure fuel supply via a simple circulating pump and the fuel is injected by admission of compressed air. The injector actuation and air admission is...

If you look carefully at the full size Gardner engine you will find a 'cold start' button at the free end of the fuel pump which allows extra rack travel on start up. Even the original engines needed some encouragement to start!! Despite that, an experienced operator could start an engine with...

Hi Minh A couple of minor observations which may (or may not!) be relevant :- There appears to be quite a difference in the lengths of the injector pipes which might create false timing and I cannot see if you have spill pipes from the injectors to release excess fuel after injection? It's still...

Diesel versus petrol, a Marine Engineer's perspective:

Hi Minh, how about the big brother of the 4LW you are currently building - the Gardner 8L3B complete with Gardner reverse/reduction gearbox? I am in awe of your skill in modelling the 4LW Graham

Such a fascinating engine, all credit to the original designer but most of all to your engineering skills sir. Looking at the kinematics of the drive chain is there ever a "dead spot" beyond which the engine will refuse to stroke on start-up? Yours in awe, Graham

Further to my earlier post the TS stood for Tilling Stevens who were also part of the Rootes Group and manufactured the engines in Maidstone. There is no connection between Rootes Group and Roots turbochargers apart from the drive shaft!

This engine was extensively sold into the marine market as a Rootes Lister TS3. Rootes Group were the parent company of Commer and Lister Blackstone marketed these alongside their (more conventional) 4 strokes. I used to manage three vessels each having two of these as alternator (generator)...

It is common practice at sea to use a port hole glass for lapping the faces of injector nozzles. All ships carry a selection of these glasses and the Engineers just have to sweet talk the Bosun to acquire one!

This effect is occasionally found in full size diesels and is a result of excess coolant velocity. Over time it produces an appearance similar to woodworm attack or osmosis on a fibreglass yacht hull and the holes will 'bore' through the full thickness of the liner wall. Caveat emptor cavitation!

As an alternative to, or in association with some of the above it is worth considering the use of 'running-in' or 'breaking-in' oils. Graham

This reminds me of the story of the African king who had a hobby of collecting ceremonial thrones which he stored in the roof of his hut. Eventually the weight of his collection caused the roof to collapse and the demise of the king - the moral is, people who live in grass houses shouldn't stow...

I guess the leadscrew is actually 1" dia x 8tpi which, once you sort out the gear ratios, will make the thread cutting calcs straightforward. Plan for the worst but hope for the best!

Needs to be brought back to life as per Latherus

Does the engine have a thrust bearing to mitigate end float? G

Do the dimensions of the adjacent component(s) give any clues? I was always taught never to lift dimensions from printed drawings. Graham

It's certainly not a steam engine. The push rods and valve gear indicate a 4 stroke IC engine and it looks as though there is an injector situated on the cylinder head so could be gas or diesel powered. Also there's a vacant flange at the flywheel end of the cam housing which probably...

The site edited my message which gave the email address, you'll find Gears and Sprockets in the UK but I guess the hyperlink in the original reply will work. Graham

Have a look at Gears and Sprockets Graham