Slowing a lister cs.

Discussion in 'Help Wanted' started by sion, Feb 19, 2016.

  1. sion

    sion New Member

    I have a cs 6 doing a job its really a bit too big for at the moment, it can be slowed down quite a bit with the adjustment available on the speed control screw and seems to run very happily so. But i'm concerned about it getting enough oil splashed around, and wonder if there is known safe minimum speed for the cs? Its a later one with the plunger oil pump on the side, but I understand it still requires splash lubrication for the big end and cylinder.
  2. Victoria

    Victoria Member

    You do not give any figures for the speed you are slowing the engine down to, from its rated 600/650 rpm but as it was an engine derived from an earlier petrol Lister L type which would stand running at a slower speed and as it was sold as a low-speed diesel, then providing you are not dramatically slowing it down I cannot envisage any problem. A heavy load would slow it down anyway, and as you appear to be running it on a light load, all should be well. If you read David Edgington's "The Lister CS Story", that may reassure you.
  3. admin

    admin New Member

    As Eric said plus

    We run several CS engines all day every day and have reduced speeds to 450, they seem happy at that and we have not seen any issues with bearings apart from the S-o-M b/e when nobody checked the oil for several months :-(

    Knowing your application it would still produce enough poke.

  4. pp-admin

    pp-admin Member

    i would not worry about it too much.!!!!

    the bomb proof CS design was a direct evolution of Listers original very first engine type which was the "L" starting in 1908/9.

    I have many CS versions next to several very old "L"' s in my workshop and the bearing layout, sump splash system and dipper is almost identical. The first versions of the "L" ticked over at around 350-400 rpm although farmers often slowed this down to as low as 200 rpm to slow down the belt driven machines they were using from the Lister flywheel. I have personally known old farmers who did this and they still waxed lyrical about Lister engines never failing quality and durability. I honestly would not worry provided the oil pump is in good order and supplying oil to the main bearings. The dipper relies on a minium oil level under the trough plate so make sure to maintain the correct level. You can always go a bit mad on the manual oil pump lever primer before you start the thing running but all these old engines actually do is pump oil at very low pressure into feeder pipes that drip oil into the bearing access holes. Its all a bit hit and miss compared to later diesel designs with much higher pressure forced lubrication. Your best insurance policy is to use good simple HD oil (older spec stuff and not the fancy modern oils) and change it frequently having given the sump interior a really good swabbing out with paraffin or heating oil until its spotless and dry.

    all the best,
  5. ButchC

    ButchC Member

    What I have found is that there is a lot of oil slinging around inside a CS engine even at lowered RPMs. What most dont realize is the great bulk of spash does not come from the dipper but indeed from the crankshaft throw. Oil overflows from the main bearing area and from there travels out the throw and is flung around coating the crankcase even at greatly lowered RPMs. I found this out after fabricating a temporary crankcase door from clear plastic.

    Only the pumpless Indian variations which rely solely on the dipper for lubrication require approximately 450 RPM to splash enough oil. The original design throws plenty of oil around even at 300 RPM. Personally I have never tried and checked one any slower.

    What I suggest to those with lubrication concerns at lowered RPMs is to slow the engine down to the RPM in question. Then let it sit for a day undisturbed. Then start it and let it run for a short time, not more than minute and then quickly remove the crankcase door and take a peak inside, it will look like an oil rainstorm in there if your oil pump is working as it should.

    Have plenty of rags ready! You will need them!

  6. petternut

    petternut Administrator

    I agree with Butch. To prove this for yourself simply run the engine with the door off :) BTW that is a joke do not do it!

  7. rustykev1

    rustykev1 Member

    I have never worked out how the ventilated crankcases of the early Listers managed to retain their oil.
  8. petternut

    petternut Administrator

    They didn't :)
  9. sion

    sion New Member

    Thanks all for all the replies, i feel much more confident now that i'm not pushing my luck with it. Its running at the moment at about 400 - 450rpm and happily pushing about a Kilowatt into our battery bank. I was surprised it doesn't suggest a minimum speed in the manual, but I guess from the figures mentioned above that Lister were probably fairly confident no one would be able to slow it down enough and get any useful work out of it.

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