11 replies to this topic

[Jaymac]

Hi All,

 

I need to fill my carburettor with oil on a regular basis possibly every 30 miles, I don’t drive it very often but when I do it needs oil in the carb. What could be the problem here.

[Spider]

How much oil are you putting in it ?

 

It doesn't get filled to the top, just near the top of the piston tube.

 

 

[Jaymac]

I fill it to the top of the piston tube but within a few weeks the oil has gone, the car is very occasionally driven and only for about ten miles each time.

[Lplus]

I fill it to the top of the piston tube but within a few weeks the oil has gone, the car is very occasionally driven and only for about ten miles each time.

The real test is to remove the air intake and lift the piston by hand.  If there is resistance to lifting and the piston drops slowly then there is still enough oil in the damper.

[Steam]

How much oil is actually left in there, is it completely empty or is ther some left?

[mbolt998]

I think it might just come out of the top when the piston goes up if you overfill it. Per the diagram Spider posted I'm not sure there's even anywhere for it go? The place you pour it in is just a blind hole. I could be wrong but I don't think it goes all the way down to where the needle screws in. Have never taken one apart so I'm not completely sure about this. Hopefully someone can confirm.

[Jaymac]

I am going to refill with oil and keep a close eye on how long it lasts.

[NLinPEN]

Hi All,

 

I need to fill my carburettor with oil on a regular basis possibly every 30 miles, I don’t drive it very often but when I do it needs oil in the carb. What could be the problem here.

What criteria do you use to determine that "it needs oil"? The oil has nowhere to go and stays where it is (i.e. it can't leak). If you overfill it the excess will be automatically spit out by the carburettor and ends up being burnt in your engine.

[Jaymac]

When it has no resistance as I pull the piston out of the carburettor and very poor acceleration when driving the car.

[cal844]

Sounds to me like you need a tune up

[Chris1275gt]

I’d unscrew the damper and remove it, undo the 3 screws and pull the suction chamber off sometimes the piston will come with it, if not remove the spring and pull the piston out clean all with a rag especially inside the suction chamber and the inside of the tube check the inside of the suction chamber for scoring by running your fingers down the inside if ok put it back together fill the dash pot as per Spiders diagram and see if it goes ok. It’s really easy there are no gaskets and the piston only fits in one way. I’m presuming it’s a Hs2 or Hs4 sometimes the overspill oil can make the piston sticky.

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[Ethel]

Putting the damper back in would give a bit better indication as it's main purpose it to resist the piston rising. Apparently some can leak as the needle housing was pressed in to the bottom. I'd expect plenty of evidence on the jet bridge, but sitting the, filled, piston in the neck of jam jar overnight should show up a leak too.