Air and smells coming up around gap in the soil pipe

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I have no idea why nobody hasn't asked you this already, but what you need to do is stand back and take some wider pics please.
 
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Hope these help? The main gap is around the back on the pipe.
 

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The brown pipe is the original pottery clay one..
House builders lt in 1980's
Its the original waste pipe. We have not added anything more to the soil stack that was not already there.
About 10 feet away in the garden we have a concrete man hole. I lifted it today and ran a tap in the toilet. Water was flowing out OK. The smell of turps in the sewer was the same smell we were get in in the toilet area.
Apart from the turpentine smell I would suggest a smoke bomb test:unsure:where is the turps being poured down a drain :?:
 
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But we have air flowing up through the gap and we had heavy rain a week ago which cause sewage smells. I should not be smelling drains from the toilet and the only way I can see it is through this air hole?
 
That brown pipe is plastic so should be well sealed.

I’d also do a smoke test from your manhole outside.
 
So a small update here. I realised the house is on a block and beam footing and air flows under the house. There was a chamber built to house the soil stack and after recent building work the cavity seal had broken and opened. Smells we coming in with air flow as the main sewer runs under the garden about 10ft from the actual toilet.
I sealed it with some 'mud' /concrete and the air flow was stemmed and the smell departed. All good.

Having now had a new toilet plumbed in and the room painted the toilet room is smelling a little strange again but I am hoping this is down to the watered down gone off primer the Mrs used on the walls!?
 

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