Diesel Two-Stroke | The Lohmann Diesel | The one where he gets too excited and breaks something
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- เผยแพร่เมื่อ 9 ก.ย. 2024
- This is a Lohmann Diesel moped engine with 18cc and variable compression.
This is the second Lohmann I have featured on the channel, and even though its a typ 500 just like the other one, this one got quite some differences.
#dieselengine #twostroke #moped
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That moment when the heart sinks when you realise you just broke something that's hard to find or repair, been there all to often myself, but at least with bushings, they're easy enough to make as you say, need to get yourself one of them mini-lathes so you can make your own (aswell as do other metal-turning projects!)... :D
Could be cool with a lathe for sure...!
10:47 "a gentle heat" _proceeds to pull out a gas torch_
Wait until you see my small hammer
@@SeasideGarage You mean the wrecking ball hanging from the crane?
@13:52 When he points at the journal on the flywheel and the (presumably) bronze bush in the casing and says "there's no bearing on this side" I'm, just screaming (in my head) "what's that then?!!!!"
Always interesting to see what you're up to in your garage.
I have to say that Herr Lohmann was an ingenious fellow. His small workshop must have had a small lathe for basic work and that would include the bronze bushes. They are very basic but might have been reamed to fit. The Auction pic showed what appeared to be a hole in the flywheel. That could have been for a peg spanner for fitting and removal. Might be a mod as yours doesn't appear to have a hole. The top ring may well be stuck due to carbon but because the alloy piston expands it may get looser when it's hot. It's a very interesting engine, an off the wall application of the diesel principle. Thanks Otto.
Good pic of the exploded motor here. The damaged bushes are not shown as being listed as a spare part. ducaticucciolonederland
Thats where I got the piston rings from! :)
I thought that maybe so when I saw they were priced there at 25.
Your engine seems to be a 51 model (from 1951), as the exhaust with the spring was used only there. The piston with 3 rings was used from 1952.
Interesting! thanks!
Thanks for bringing us along with you in this exploration of a very rare cycle engine
The bushings would be easy to make. I'd suggest you take a good look at yours to determine if it's oil impregnated bushing material. It's common material to buy for making bushings if it's needed.
The compression release might have been for coasting down hill which would maybe point to that extra hole lining up to dump unburnt fuel out of the engine.
Maybe they thought leaving the drive wheel engaged while coasting would save wear on the drive wheel and tire by reducing the number of times you might have to drop it in gear.
Obviously dropping a spinning wheel on a tire causes a great deal of lost rubber just like an airplane does while first touching down on a runway.
I have never heard of these engines! Great video as usual, and always informative.
Thank you for taking us along on an amazing adventure!🌞
It will be interesting to hear this unique engine run again.
i do believe the one posting where they suggested a peg spanner when mentioning te one and only hole in the flywheel, one only needs one hole when there is a large recess in the middle that will acommodate the other pin of the peg spanner it will rest against the ramp/rim of the recess and a rotational force ( torque ) kan be transmitted
Very interesting design
Sorry yo hear that, a competent machine shop should be able to remake those bearings from phosphorus bronze, what ever you do do not throw the broken parts away as they will ad in measuring up for remanufacturing the damaged parts. I am sure you’ll be able to get it fixed again & excellent video
Fascinating little engine. You do find some very interesting stuff.
those little engine are super interesting
I was shouting at the screen, "LEFT-HANDED SCREWED THREAD!"
I'm so happy you found it.
I can sleep soundly now! 😁
I actually sometimes feel I can hear the viewers input when doing stuff....
😁@@SeasideGarage
This a fun look at a unique engine.
There must be a you a TH-cam machinist who would do collation.
The broken bearing(s?) look like the "top hat" type, maybe Oilite (oil impregnated phosphor bronze, I think). You might be lucky and find them in the right size, I had to look for some for a 1937 Ransomes Crawler last year and eventually found something close enough to work.
I presume they will be metric? I guess for sealing on a 2 stroke crankcase they might need to reamed for a good air tight seal.
The oil impregnated stuff is the Devil to machine though!
Intressant, jag är glad du visar hur denna lilla motorn är uppbyggd,
The bushing that you destroyed is NOT brass, it is a "phosphor bronze bush" (search that term). If you make a brass bush it will eventually destroy the steel shaft.
Bronze bushes must never be machined, as they contain microscopic pores that hold oil to provide lubrication. There are specialist companies that stock 1000s of diffenet sizes, good luck finding the one that you need.
Reach out to Master Milo who is an accomplished engineer I would think could make you the new bushing part with ease as he is very well set up for machining.
Reading some of the other comments. Mine is from 1951 and I believe is different. I would have to open up the box and verify, but I have the manual which most likely has parts list.
Feel free to send my that unused Lohmann when you get tired of moving it around.... :P
"it reminds me of something"😂😂
23:12 My Honest opinion on those rings? I would simply ask some VERY old timmers what they did that are in their 80s or 90s and ask them what they did for Rings and how they mended them after they lost their spring.
Seems that if you heat them up and put them on a circular expander jig of some kind? They will get their springiness back.
Q motor mas lindo duradero y economico
If the damaged bronze bushes were a standard part, you might be able to find them in SKF’s online catalogue, or one of the internet bearing suppliers like simplybearings or bearingboys (sorry, I only know UK suppliers)
If you never have welded cast aluminum before give it to an expert to do. I’ve seen many of ruined cases ( Triumphs) from older castings that people have tried to weld and just made bigger problems for themselves. The quality of the aluminum and the process used to cast them just wasn’t as advanced as what they are using and making this day and age . Thanks for sharing this unusual engine and good luck 👍
I am looking forward to hear you say „Nervensäge“ for the exhaust in on of the next Videos 😉
Naarvesashshgeh!
@@SeasideGarage 👍😅
Hi from the UK! interesting video, as for the damaged brass bearing ...i make these type for vintage vehicles ..if you take the housing and the shaft and broken bearing to any decent engineering machine shop they will make you new ones to suit ..there must be a small engineers shop near you that can help with this..if not reply to me and i will make them for you
Never use a press… just heat! I just use my wives oven🙈 and I wouldn’t tig weld it. The casting back in those days where really bad full off cracks.
I'd just make some new bronze bushings on a lathe of i were you. Odds are you'll be able to find something that'll work, though.
A Dutch? guy on TH-cam had one of these, or something similar, attached to the original 'bicycle'. Cant immediately find the link.
Try searching oil light bushes, not sure i spelt it right
Question is? Is the damaged bush oil impregnated material?
yes :)
Sorry they are called oilite bushes
Det burde være nemt at dreje en ny messing/bronce bøsning på en drejebænk. Hvis du kan tage nogle mål inde i gearkasse huset kan jeg måske lave en til dig
I just looked at my photos, which is type 500 model 51, from 1951. I would guess that the one you took apart is a later model?
Think its a early one actually
Curious little thing.....Are sure he wasn't French? 🤣
How much would yiu pay for one of one of those engines
6:15 I wonder what...
Firs comment. 😂🎉