Oil boiler oil leak under combustion chamber

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29 Oct 2010
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Sussex
Country
United Kingdom
My Trianco Contractor is 11 years old. For a while now it has smelled 'oily' when on, and at the last service I mentioned the slight oil show which was to the side and just below the combustion chamber. He didn't seem to think much of it. I asked if it was due to 'over fueling' , ie un-ignited oil being sprayed before ignition or after shutdown. He dismissed this idea. However, the smell gets more noticeable and I assume it's from this unburnt oil being warmed up by the heat of the chamber. Looking under, there is a bigger patch. Any thoughts ? is it a leaky valve in the nozzle feed ? It's a Riello burner. Thanks for any insights.
 
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Are you absolutely certain there is no oil leak from flexible connector or oil pump
Looks to be coming from under the combustion chamber, though it's difficult to see. When I checked it before there was none forward of the flexible pipe though I need to get in for a good look
 

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Check the joint between the burner motor and the oil pump. It is possible the shaft seal is leaking especially if you only notice it whilst running.
 
Check the joint between the burner motor and the oil pump. It is possible the shaft seal is leaking especially if you only notice it whilst running.
Seconded. Just replaced mine the other week for this exact issue. Tend to find it gets underneath the casing and weeps back out for days after even after the issue is sorted.
 

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