Vokera Excel very noisy

[JamesHughes]

Hi all, newbie here so be gentle!

I have a Vokera Excel 80SP that has recently become very noisy. The noise occurs when either the heating starts up after being off for a while, or a hot tap is turn on after being off for a while. Its a sort of screech/rumble - I liken it to lots of bubbles being pumped. After a few seconds all recovers.

I have recently installed all the new bits from the manifold service kit and replaced all the manifold gaskets and plungers etc, and it worked fine for a number of weeks after that, then this noise turned up.

I just checked the vent on the top of the auto air vent bottle (top of pump), and loosened it. There was greasy cack inside the cap which I cleaned out. Noise seems to have improved a bit, but still occasionally occurs. Can this part be cleaned/serviced? Or is that an unlilely cause?

I think its air in the system that doesnt seem to be vented, but I am really open to ideas. Looking through other posts the expansion vessel may be the culprit, but would welcome any hep and explanations.

Rgds

James

 

[Kristoflampie]

Ive come across this before and its usually down to the bobbin ( the plastic bit in the service kit) getting choked or not sealing front or back depending if on heating or hot water i.e the O ring on the back of the bobbin coming off or not sealing properly . Take it out and check its assembly is correct as its acting as a penny whistle or similar with the water singing across it.
Hope this helps , just a guess as I aint standing in front of it!!

 

[JamesHughes]

Cheers, I'll take a look at the weekend. Sounds like a good starting point.

James