Bosch Neff Half Moon Element Removal

[spanner51]

When ever I replace a half moon element on a Bosch/Neff oven I allways remove the fan to get to the center fixing screw. I allways have a lot of trouble getting the fan off, and I am careful not to damage the shaft. I have thought of using WD40, but I don’t like using it in an oven

So…. does anyone know of an easy way to remove the fan, or can I do it without removing it

Thanks

Graham

[eastlmark]

Re: Bosch Neff Half Moon Element Removal

have to remove the fan due that that darn screw in the middle. I use a blow lamp, heat it up for a few minutes and it should pull off with no damage to the motor.

Would suggest trying the fan motor first to make sure a) it works and b) its not noisy as you will take the blame for it if it is after struggling to remove the fan.
Irony is that on the large oven, same fan and motor, the fan usually pulls clean off with not effort yet there is no need to remove it on these just to change the element.

[EFS]

Re: Bosch Neff Half Moon Element Removal

The fans usually come off easily enough with no assistance but
having tried the blowlamp treatment on one stubborn fan which refused to budge and not wishing to destroy the motor I drilled a hole in it to get the top screw out of the element.
Then I had to drill another hole same size on the opposite side to keep the balance.
Drastic yes but it worked

Steve

[spanner51]

Re: Bosch Neff Half Moon Element Removal

Thanks for the suggestion of a blow lamp. I have one to fit tomorrow morning, so will give it a try

Graham

[admin]

Re: Bosch Neff Half Moon Element Removal

few drops of 3 in 1 on the shaft then hold with pliers and turn fan with another set of pliers.work the oil in to shaft, then pull off,
could also use paint stripper hot air gun ,safer than blow torch

happy days 😀

canufixit

[nomadPaul]

Re: Bosch Neff Half Moon Element Removal

The fan removal is nearly always a pain in the backside . I spend a few minutes more ensuring it’s removed properly so as not to bend the motor shaft as it can cause the fan to oscillate and catch making it noisy.
I don’t use a blow torch or WD40 but my method does require the oven to be removed (not normally too much hassle as they’re built-under ovens)

First I remove the fan blade securing nut (reverse thread remember !) then after pulling the oven out I remove the rear cover and then the 3 securing screws holding the fan motor in place. Back to the oven cavity and I put the bottom flat end of my hammer on the end of the shaft and knock it backwards. This forces the motor back until the shaft end is flush with the blade. Go to the back and the motor should pull away leaving the blade loose in the oven . It may seem a bit involved but it only takes a few minutes more and ensures a clean removal.

It’s also worth giving the motor shaft and the inner hole of the blade a quick rub down with a bit of abrasive paper to help them slide together again during reinstall.

[spanner51]

Re: Bosch Neff Half Moon Element Removal

Great tips
I done the job first thing this morning and used a blow lamp. It was quite a struggle getting the fan off without damaging the motor shaft, but I did it eventually.

canufixit’s suggestion of holding the shaft while winding off the fan was a good idea, but I thought there was too much risk of damaging the shaft with pliers.

If there was such a thing as a ‘D’ shaped nut driver to hold the shaft still, it would make things easier

Thanks again for the replies

Graham

[eastlmark]

Re: Bosch Neff Half Moon Element Removal

spanner51 wrote:Great tips
I done the job first thing this morning and used a blow lamp. It was quite a struggle getting the fan off without damaging the motor shaft, but I did it eventually.

canufixit’s suggestion of holding the shaft while winding off the fan was a good idea, but I thought there was too much risk of damaging the shaft with pliers.

If there was such a thing as a ‘D’ shaped nut driver to hold the shaft still, it would make things easier

Thanks again for the replies

Graham

the washer under the nut has a D shape so it is possible to lift it slightly away from the fan to clear the locking pip and then grip the edges of the washer with mole grips to lock the shaft while you turn the fan. Not sure about the three in one tip, would not fancy the oily rag smell complaint the next time they cook in it.
Cannot see any safety issues with the blow lamp, it is inside an oven after all, but yes a heat gun would do the job too.
I think the biggest problem with these ovens is access as its an uncomfortable working position as never have an issue with fans on the larger, better positioned ovens with the same fan.

[DrDill]

Re: Bosch Neff Half Moon Element Removal

I would never use heat on a shaft that somewhere on it has windings or segments, ie a motor. The heat will travel and can damage the resistance coatings and segment seperators. I big no no. Heat travels very quickly.

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[Martin]

Re: Bosch Neff Half Moon Element Removal

DrDill wrote:The heat will travel and can damage the resistance coatings and segment seperators. I big no no. Heat travels very quickly.

There speaks a man that has never ventured into replacing a half moon I would venture to suggest. :rolls:

.?…..and before you break out into a cold sweat Doc……the advice given earlier is solid gold stuff……that with stubborn fans that don’t lift off easily once the nut and D washer are removed, then the need for drastic intervention is apparent. Locally applied heat to the aluminium fan ( not the shaft…the fan OK?) is the solution. The fan gets hot, swells by a few thousands of an inch outward and in so doing releases it’s hold on the mild steel shaft and the vaporised oils and carbon deposits surrounding that shaft. The applied heat so localised and short term, sufficient enough to allow that process to happen. (15 seconds or so is all that’s required) then, and to avoid burnings ones fingers, grab the fan blades with two pairs of pliers (at opposit ends) and the whole fan comes off with minimal force.

If you intend to cook the motor shaft and windings in the way you suggest then ignore the above advice and continue applying your blowtorch flame for about (say) 10 minutes? …that’ll do nicely. 😈

[DrDill]

Re: Bosch Neff Half Moon Element Removal

Been fixing neff ovens for 32 years martin, and never once had to use heat on any, and for that matter never used heat on any oven repair! Only time i use heat is when i am brazing the pipes on a compressor change, yes even on r600a.
But hey ho martin knows me very well, to suggest i havnt changed one, and someone else on another thread suggested i didnt repair fridges just because i dont do what others do.
It seems when i give my opinion certain people make very un factual statements about me. Hmmmm.

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[eastlmark]

Re: Bosch Neff Half Moon Element Removal

DrDill wrote:Been fixing neff ovens for 32 years martin, and never once had to use heat on any, and for that matter never used heat on any oven repair! Only time i use heat is when i am brazing the pipes on a compressor change, yes even on r600a.
But hey ho martin knows me very well, to suggest i havnt changed one, and someone else on another thread suggested i didnt repair fridges just because i dont do what others do.
It seems when i give my opinion certain people make very un factual statements about me. Hmmmm.

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when I mentioned applying heat I was assuming most of us already know how much heat will get the job done without damage. It is an oven after all. And yes I have done plenty of these where the fan has lifted off without issue but confirm that there are just as many where that is not the case maybe, you just been lucky.
Must admit the blowlamp is rarely used these days but to suggest you have never used heat on any repair would suggest a lot of broken drum pulleys, tripod kits (32 years after all) etc that would have lifted off easily with a bit of flame.

[jeremy]

Re: Bosch Neff Half Moon Element Removal

take the oven out, lay it backwards, with the nut and D washer removed squirt some brake cleaner on the shaft, let it penetrate for a minute or two then the fan should just lift off with hardly any effort.

This method has been mentioned before on here by someone else and it does work.

[cornwell40]

Re: Bosch Neff Half Moon Element Removal

You bunch o’ southern muppets, it’s like this yer sen.
Flat cap on backerds for easier access(remember…fag out and behind ear for this one…first impressions n’all). WD40 sprayed liberally rounn t’shaft. A cold chisel either side o’t fan and whack ’em with yer bearin’ ‘ammer. Comes out a treat. If it doesn’t charge yer call out and bugger off to’t next un.

Job Dunn.
😉

[leavemetogetonwithit]

Re: Bosch Neff Half Moon Element Removal

cornwell40 wrote:You bunch o’ southern muppets, it’s like this yer sen.
Flat cap on backerds for easier access(remember…fag out and behind ear for this one…first impressions n’all). WD40 sprayed liberally rounn t’shaft. A cold chisel either side o’t fan and whack ’em with yer bearin’ ‘ammer. Comes out a treat. If it doesn’t charge yer call out and bugger off to’t next un.

Job Dunn.
😉
Larf owt lowd.
Thass ow oi do it pre’y mutch. Cep I ews biss o’ wud sted o’ coal chizles. Ann oi downt smoak or wer a capp.
Mike.

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