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New bearings fitted. Fantastic difference. Really quiet and smooth. Tick over was as noisy as flat out is now. DIYnot scores again! Thanks - Jonathan

I drove the fan back on the shaft a little, cleaned up the end of the shaft with some Dremel tools. Made a puller from 5mm aluminium strip, drilled and tapped 2 holes. The fan is surprisingly hard. I didn't try a magnet on it. The fan pulled off the shaft easily. Tony was quite right to say...

You know, it might be easier to drill and tap 3 holes in the fan, make a corresponding plate and use 3 bolts to pull it off. Easier than making a puller. The work might change the fan balance, but any of this violence might do so. What is the fan made of? It is at work at present so I can't...

The bearings are SKF626ZC3GJB. Simply Bearings stock them. Probably much better spec than original. The boss on the fan is about 11mm deep, 22mm across. Near the base there is a groove about 1.5mm wide. That is what I need to grip. The 6mm shaft protrudes about 7mm from the boss. I had a...

I have some cheap and nasty ones but they would need a lot of grinding. RS have a nice looking set for £26.56, but I don't know if it would fit in. I'll have a look at Halford and maybe some tool suppliers. Obviously, I don't want to spend anything near the cost of a new fan assembly! One site...

Thanks very much for the reply. The end of the shaft is black. I should have thought of cleaning I have probably put it off balance already with my efforts to get it off. If it comes out smooth enough I will see if I can rebalance it. The next question is - where id you get a puller that...

I find I can get high temp stainless bearings quite easily, so I just need to get the fan off the shaft..... JW

The fan in my Puma 80 perm pilot is causing problems. Rear bearing is OK. Front appears to be a bit stiff. I managed to get it going again but it is noisy. I would like to try new bearings. The motor cooling fan can be released easily, but I cannot get the main fan off the shaft. I found the...

The fan in mine appears to have 'gone home'. Rear bearing is OK. Front appears to be a bit stiff. A while ago, the motor cooling fan came loose and drifted a bit, binding on the motor. Quite easily fixed, but I could not get the main fan off. I found the grubscrew and released it, but the fan...

Thanks. Any idea of the date of the change? Any visual clues?

I think I found the answer from other replies. 3RF should work with SCR. I still have to find out if I can buy a 3RF on it's own. JW

Sorry if this repeats a previous question. A friend has a digistat SCR and RF1 setup. The RF1 only gives thermostat, no timer. Is it possible to buy just the stat/timer? 3RF perhaps? I gather there is a sequence to get the two to talk if they are compatible. I note from other posts that the...

Could be. The Puma was out of date when I bought it. It's a box of odd parts flying in loose formation, rather than an integrated design. I've been doing a bit of surfing. I still see Vaillant and Worcester Bosch recommended for reliability. I think I will wait until the summer to replace - it...

Well I can make several guesses. Price would be first. I had this boiler because it was the cheapest which my plumber at the time would fit. That brings me to the second possible reason - fitter familiarity. At that time there did not seem to be much familiarity with any combi boilers amongst...

Excuse me! I didn't think I was moaning - about the boiler itself. I guess you are telling me these boilers are very unreliable. I'm not surprised. The other pressure switch did fail a while ago. I have it on reasonable authority that there is a British Gas league table. Worcester Bosch most...

I've had a Puma 80 for nearly 10 years now. I had the same problem with the flow valve sticking recently. I took it of, cleaned it up and put on a bit of WD40. It is working OK now. I had a lot of trouble with the boiler - failed boards, gas solenoid and gas valve. After the attentions of...