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How Much Steam Oil

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Adam Gregory 121/08/2012 19:32:13
20 forum posts
11 photos

Hi all.

Is there a correct amount of steam oil and can you have to much?

On my steam plant the oil tank empties in about 35 to 45 minutes, the reason for asking is because i'm getting a lot of cream coloured sludge from the oil trap.


Jens Eirik Skogstad22/08/2012 05:25:17
367 forum posts
22 photos

As rule for the lubricator in modelsteam engine has 25-30 revolution for each pump stroke. If too much oil, increase revolution for each pump stroke.

Adam Gregory 122/08/2012 18:45:26
20 forum posts
11 photos

Thanks for replies.

Yes i do get alot of oil on the valve and piston rod exits so i'll turn up some different cranks with a shorter throw and trial them for a couple of test runs. Are there any signs i should look out for of under oiling the engine or if it seizes i gone to far.


Fred Graham 114/09/2015 16:56:31
6 forum posts

Hi Folks,

Long time, no communicate!

I am interested to hear if someone using an oil pump, rather than a displacement lubricator, which seem most popular. Has anyone got any ideas about how much oil should be delivered to a steam engine. Although a respondent to the query suggested so many revs of the engine to one stroke of the pump, this must depend on the size of the pump and the swept volume of the engine. With a large swept volume and a small swept volume pump too little oil may be delivered and vice versa.

I have looked in vain for some technical data about steam engine lubrication but most times I find only displacement lubricator information. There must be some relationship between film thickness and internal engine surface area to be lubricated per revolution and the capacity of the oil pump to deliver this quantity continuously and reliably.

Perhaps I am being far to pedantic and most people would say, "as long as there is oil going in and the oil trap is filling up don't worry" but it does sound like an interesting subject to investigate, doesn't it?

I would be interested in any guidance on the subject especially if it is not a bundle of differential equations and lots of needless mathematical complexity'

All the best and happy steaming, Fred Graham

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