Carburettor flooding

[Pkitson]

Just finished engine rebuild and on first startup, it fired almost straight away, the good news. However petrol poured out the overflow on both carbs. I checked floats and needle valves and all ok, so any suggestions. Can the pump push to hard for instance..

[Ashley James]

It only takes tiny particles to unset the float needles and it often happens after the carbs have been rebuilt, so you can try tapping them with a spanner to see if it stops, or you can fit new needle valves with piton tips or the Gross valves Moss sell. It's also a good idea to put a filter in the fuel line to reduce the chances of it happening again.

[Pkitson]

Thanks i'll try this afternoon and see what happens.

[Fireman049]

Both my TR3A and 'E'-type Jaguar are fitted with the excellent Grose jets ~ never any trouble.

 

Tom.

[Pkitson]

Thanks both, have ordered the Grose jets but also reassembled after blowing thru the jets and all is now fine. Amazing how engine runs with only rudimentary timing and carb setup. Next job is a wine from the dynamo so need to sort that, probably a bearing.

[RogerH]

Make sure the belt is not too tight. Also it could be the belt that is making the noise. Give it a quick squirt with WD40 and see what happens.

 

Roger

[ianc]

Make sure you fit filter between pump and carburettors - it will collapse over time if fitted on the inlet side of the pump.

Ian Cornish

[Pkitson]

Thanks for all that. Grose jets now fitted so no petrol spiting out. I think the noise is the fan belt.

However after running for a couple of minutes there is pressure in the radiator, is this normal. Head was worked on for unleaded including a skim to make sure it was flat. Obviously new gasket fitted so am somewhat worried by this pressur, any clues please.

[peejay4A]

If the coolant is hot the pressure in the system will rise, that's normal. If it's excessive it will pop the valve in the radiator cap and exit the overflow pipe. If it does that then something is wrong.

[Pkitson]

Thanks i,ll run it a bit longer tomorrow and see what happens.

[peejay4A]

You might also have an airlock in the cooling system as you will have drained it completely for the rebuild. Have a search on the forums here for advice on that.

[ianc]

The coolant expands as the temperature rises and if you filled the radiator completely, some of the coolant will be expelled past the radiator cap - this is quite normal.

With a standard TR2/3/4, there's no point in filling the system completely - just fill to about an inch below the bottom of the cap as that leaves sufficient volume for expansion when hot. That way, you won't be wasting coolant.

Ian Cornish

[Don Elliott]

Next time you start the engine, leave the fill cap off the radiator extension box. If you have any trapped air in the system it will escape once the engine gets hot and you don't even have to be driving it while doing this. If the coolant level drops during or after this test, the air has escaped, top up the level, put on the cap and all should be good.

[Dave Larnder]

What pressure cap have you got fitted? 4lb is the right one, that is assuming that you haven´t a 0lb fitted there and the 4lb on the remote balance tank, again if you have got a tank.

 

Dave