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Expansion Bottle Lower Than The Rad?


Guest mrinverted232

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Guest mrinverted232

Hi Guys

 

My first post talked about cooling problems, well..... I think the rad was a little old and tired so done some research and had this rad built by specialists in Nottingham, they welded on all the brackets and drilled the holes, all I had to do was slot it in, after 10 minutes running today all seemed well, but it was only in the workshop not on the road.

 

The Expansion tank ? when I got the car last week the expansion tank was situated lower than the rad top , so I have just put it back in the same place , does it matter if its lower than the radiator top?

 

The expansion tank I think is from a Honda and enters through the top and not at the bottom.......... any suggestions?

 

Thanks

 

Craig

 

 

post-14137-0-32025200-1499453112_thumb.jpg

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If you find you get airlocks that are hard to shift you can do what i did.... It looks like you have the same setup as i have and their is a tube on the left of the picture running along the side of the rocker cover. I used copper pipe and simply put a T piece in with a radiator bleed valve. Costs about £1-2 depending on whether you have some plumbing bits kicking around. Makes it dead easy to bleed the air out.

 

hth

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Can you confirm that under the lid/inside the expansion bottle the tube going through the lid extends to the bottom of the bottle? If it does then you should have a working spit/suck system. If not then the system will not bleed air and will be prone to airlocks.

 

Nigel

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Guest mrinverted232

Thanks guys, all great suggestions,

 

Agent- z yes I think the previous owner has fitted a screw off cap at the highest point just before the heater matrix, I looked at this yesterday , when the car was running I removed it and had water coming out and not air.

 

Longboarder, yes..... inside the expansion bottle from the underside of the cap it has a rubber tube that extends to the bottom and is sitting in the coolant .

 

Thank you for your help.

Craig

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Guest mrinverted232

Hi

 

The previous owner fitted this.

 

This is the highest point in the water system, so am guessing water coming outa here means no air locks. :)

 

Thanks

 

Craig

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cool looks like it should do the job. What poundage is the cap you have? i think i am running 13psi which i think is pretty standard but some people fit higher poundage ones to allow increased temperatures.

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Guest mrinverted232

Hi

 

Is it normal to have a few bubbles in the coolant, when the car is idling there are quite a few air bubbles apparent, when I rev it the water flow speeds up and obviously they are not quite so visible. :unsure:

 

I have read that if the cylinder head was leaking it could pass air into the coolant system and cause air bubbles? although I dropped the oil out yesterday , and had no evidence at all of any water in the oil, dipstick looks clean and the oil filler cap looks spotless, bearing in mind the engine was re-built less than 200 miles ago and the head was skimmed and fitted with Victor Reinz full gasket set and Head Bolts.

 

Thanks again,

 

Craig

 

 

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Unless you have a very difficult plumbing prone to airlocks the simplest way to rid air from the system is to let the car run on the drive with the cap off till it gets very hot, all the while standing by with a can of water and keep on topping it up. Eventually the bubbles stop if they are trapped air. If it's a head gasket then they keep on coming.

 

Nigel

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Guest mrinverted232

Hi Nigel,

 

I dont think its airlocks, the system has a high point air bleed , when the engine is running and I remove the cap , see attached... no air is present just coolant.

 

I will check when running at a higher RPM than idle, thank you.

 

Craig

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