Automatic air vent problem

[ajt2018]

Hello,

I have a Worcester heatslave 15/19 RSO oil combi boiler.
We have had an issue where we haven’t been able to get heat to the radiators but we had hot water.
I replaced the diverter valve cartridge yesterday as believed this was the problem when I then refilled the boiler with water we had a couple of small drip type leaks one being from the auto air vent with water dripping out the top.

I have drained the water out again and am trying to get the air vent off but it is stick rigid. The manual says you can just turn it, I have tried this by hand and with a spanner but it won’t budge.

Does anyone have any ideas how I can get it off?

Many thanks

 

[ShaunCorbs]

Grips on the body and undo

 

[ajt2018]

Grips on the body and undo

Shaun, thanks for responding I’ve tried that it just doesn’t want to budge

 

[ShaunCorbs]

It will / should if you can't time to call a pro out

 

[rpm]

Don`t see anything in the photo to put a spanner on, do see a cap with ridges which indicates using a pair of grips if you can`t undo by hand.

 

[ajt2018]

Don`t see anything in the photo to put a spanner on, do see a cap with ridges which indicates using a pair of grips if you can`t undo by hand.

RPM thanks for reply yes as you’ve mentioned there is nothing obvious to put grips on apart from top rim. Will try bit more.

 

[snowhead]

They're probably a hex section at the bottom of the air vent, covered by the lagging at the moment.

Similar to these, but your's may be 1/2" or 3/8";

Automatic Air Vent Valve (Bottle Type) 3/8" BSP | eBay
Brass Compression 1/2'' Automatic Auto Bottle Air Vent Valve | eBay

 

[ajt2018]

They're probably a hex section at the bottom of the air vent, covered by the lagging at the moment.

Similar to these, but your's may be 1/2" or 3/8";

Automatic Air Vent Valve (Bottle Type) 3/8" BSP | eBay
Brass Compression 1/2'' Automatic Auto Bottle Air Vent Valve | eBay

Snow head- thanks I’ve moved some more of the insulation to expose the bottom but there is nothing there to turn a spanner on. Is there any reason I can’t spray WD40 on the base to loosen it as there is a fair bit of rust at the bottom. Thanks

 

[rpm]

Try digging deeper.

 

[ajt2018]

Try digging deeper.

I’ve got the cap off by using a large pair of water pump pliers. But the bottom doesn’t want to come off. In the picture what you see is the top of the water tank unfortunately there is no where deeper to go.thanks