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In the link above it is mentioned wich roughness on surface has to be achieved for a O ring in a rotary or linear piston application.

https://www.mnrubber.com/tools-resources/design-guide/rubber-standard-parts/groove-design-o-ring-seals/

But my cylinder is only drilled and then reamed to 2mm H7 The plunger is then put to size and cleaned well in boiling water to prevent that i try to not use diamond paste! I am aware of that and as u said the plunger has to have a mirror finish u where not right! Such tight pressure fits are...

here u can see the leak is slightly visible on the lubrication hole . this is usualy where the pump gets a drop of oil, in my case the fuel /kerosene forms small drops but it got worse after i messed around with a new plunger and now i have no plunger wich is tight, or i should better say the...

u think i havent already tried that ? i already lapped my 7th plunger and housing just now and it failed again. like i said i have information from the probalby most reliable guy and he uses o rings on all his engines since the early 1990s and they never failed he said. i just dont know if he...

i will say it again i want to stay with same material as FIND HANSEN ! his pumo : brass cylinder steel plunger ( 18mm x 2mm ) it seems many underestimate the size of this pump . made some pics and will send them ina few minute ! i know how to lap model engine cylinders and pistons and...

it would be a milkrun for me to make a big injection pump. but the sizes we are talking are so small..for my first working plunger it tookme 4 try to get one good one and this one started to kleak, and find said himself it is impossible on our smallmachines and tools to get that perfect fit...

@Mechanicboy! this makes sense on some bigger engines but i thinku underestimate the size of the pump, it is only 20mm high with the top art a bit more . and according to find hansens informations there is no o ring above the plunger , there is a housing for the plungerspring and a nut to...

have yozu tri ed it ? i mean have u made a pump and tried use o rings ? i have informations from a very very reliable persion and he mentioned he used o rings on all his plunger pumps. 2.7mm cyl. diameter , the rest is unknown of dimenions

@ minh than i wnt even try to uswe ether, i want it to run without, allthough i have a lot ether athome and some model aero compression engines, i dont want to get into the ether discussion now...kerosene or nothing ! thats my goal. it must be a true diesel , not a compression ether engine ,....

i didnt think about that so far. somehow truw but on finds waterpump u see the o ring is in the bottom and there is no nut or anything. sure it is the water and not the injection pump but i think the o rings are the key. i looked up model excavator micro hydraulic pistons and they use o rings...

okay, coolthanks for all the answers! i try to stay with brass and steel same like mr hansen , i use plunger 2mm and 18mm long , the cylinder is drilled down untill the end of the square part. at first my pump generated perfect pressure and a very very even mist pattern ! almost lke fog from a...

has someone ever tried to use o rings on the injection pump plunger =? i made a injector tester a injection pump ( plunger type) and injector close to find hansens measurements but my plunger gets slightly leaky after some time . here a video of the injector with the leaky pump . u can only see...

great it works , only one or two more questions , the TPI is this Model engineer threads or british standard withworth ? aldo the steam union for the inlet and exhaust ( do you might know the sizes ) for the pipe and the unions ?

ok , so are the <TPI threads ME or BSW ( the one on the oil cups as example ?

it works!

it is not available to open that ! can you make a picture with the phone and send it ? when i open it it say service temporarly unavailable

hy i want to build a stuart turner s50 steam engine , and therefor i need to buy me a few Taps and Dies , and i noticed that there is quite a mix between BA and BSW or other type of threads on the buids from other people ! does someone maybe know the exact taps and Dies wich are required...

neat ! thanks for the nice videos and plan to everybody wich provided some info!