Lumpy after filling dashpot

[Mr Morris]

I filled my dashpot up with oil as it was quite low yesterday. I've noticed this a few times now - everytime I fill it up the car runs a bit lumpy like its stuttering ever so slightly for a while afterwards. Could I be using the wrong oil or something? I put 3 in 1 in it.

[katy]

Perhaps you put too much oil in?

[bmcecosse]

It only needs a teaspoonful now and again. I like 3 in 1, but if you think that is making it 'gasp' - try 20W50.

[Mr Morris]

Maybe I have been putting too much in, it's hard to see so I just put in what I think. Yes it's like a "gasp" BMC, like the feeling when you try to accelorate without any choke when its cold.

[bmcecosse]

I improved my TR7 by putting 20W50 in the dashpots. It was 'gasping' quite badly until it was right up to temperature.

[JOWETTJAVELIN]

The correct oil level is just above the inner ring which the piston fits in.

I use 20/50 myself but it has to be good quality (here I go again) as the last cheap engine oil I bought years ago, when used for carb damping, made the exhaust smoke and gave lurching, rough accelleration.

3 in 1 is reserved for door locks and hinges on my car

[MriavGraves]

excess should come out hole in top if yours has a hole, 13 mm above top of rod/piston is correct level

[JOWETTJAVELIN]

Aye, but you can't stick a ruler down there! As long as there is some oil in there for piston damping it will be OK.

A visual inspection is fine.

[mike.perry]

If you overfill the dashpot it is designed so that the excess will leak into the carb until it finds the correct level
Check that the piston rises and falls correctly

[Dean]

I find if I over fill the dash pot, I get quite hungry as it takes several weeks to push the plunger back down and screw on the cap.

[bmcecosse]