Kenwood Bread Maker BM 450 Bread Pan Shaft Seal Replacement

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Introduction: Kenwood Bread Maker BM 450 Bread Pan Shaft Seal Replacement

The Kenwood BM450 is a real super bread maker, with convection and auto seed dispenser. The original bread pan developed a leak and I replaced it.But when the replacement bread pan started leaking after a few months, I had to find a repair as spares were not available in my area.

I used a Viton oil seal as a replacement for the bread pan shaft seal. I shall post a link from aliexpress.com from where I purchased it.

Step 1: Removing the Shaft and the Defective Seal.

This is the defective bread pan, and we have to extract the spindle by pushing it from the pan upper side.

Mine was so loose that it just fell out.

Once you have removed the spindle, keep it aside safely along with the 2 brass washers, impeller and cir clip. Now extract the old red rubber seal with a screwdriver or bent tip tool.

Remove a metal clip and another metal ring too.

Ensure you remove the rubber and everything from the cavity. Now clean the surroundings and the cavity thourougly.

Step 2: Measure the Hole Diameter With a Divider

Now you have to determine the hole size to order the oil seal. I arrived at 17 mm outer diameter . I

also verified with an ordinary rubber oil seal of 17 mm outer diameter that I had, just to make sure, before I ordered the Viton type. Unfortunately, the calipers will not fit here inside the pan.

Then measure the spindle diameter with a caliper.

The Kenwood spindle diameter is 8 mm. So the inner diameter of the seal should be 8mm.

Next determine the cavity depth. I arrived at 7mm.

So we need a Viton Oil Seal of 8mm (Inner Diameter) x 17mm (outer Diameter) x 7mm Width

Step 3: Order the Viton Oil Seal

Here is the AliExpress link to the shop I purchased from. I emailed the measurements to the email link of the shop, and the owner replied with a link that I bought from. I am posting screenshot of the item, but you will have to find the right item on the store or email the person.

http://www.aliexpress.com/store/group/Viton-oil-se...

Step 4: Fit the Seal Onto the Shaft and Re-assemble the Spindle

Clean the spindle throughly and fit the new Viton oil seal on it. Push this into the pan shaft hole from above, from the pan upper side.
Use a pvc pipe piece of diameter less than 8mm to tap it firmly inside with a mallet.
Ensure the oil seal is firmly seated. Do not use any glue.

Step 5: Fit the Impeller and Circlip From the Underside

Now refer to the assembly drawing, and fit the two brass washers, impeller and new stainless steel circlip.

Step 6: Final Leak Test

Fix the bread maker paddle onto the spindle. Fill with water.

Place some paper under the pan.

Keep for an hour and check for leakage of water on the paper.

Turn the paddle manually for some time, and test for water leakage.

Only if integrity of the seal is perfect, one may proceed with bread making in the machine.

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    23 Discussions

    0
    jameswong6590
    jameswong6590

    5 weeks ago

    My spindle fell out from the pan. I read through your article but I cannot figure out what is holding the spindle in place so that it does not fall out from the pan. Please help. Thank you.

    0
    solarboyy
    solarboyy

    Reply 5 weeks ago

    Hi James, kindly post a picture from the pan inside. Which is the make/ model of your machine?. In my case, the Kenwood pan spindle shaft seal had deteriorated, causing the spindle to fall out. When you correctly install the replacement oil seal, It should hold the spindle in place. Appears you have a similar issue. Procure the replacement oil seal, and follow the assembly directions. Good luck!

    0
    jameswong6590
    jameswong6590

    Reply 5 weeks ago

    Mine is Kenwood BM250. The seal appears to be fine. Does the spindle require a circlip to hold it in place?

    53721727_max.jpg
    0
    solarboyy
    solarboyy

    Reply 4 weeks ago

    Yes, it does have a circlip, but it is fixed on the outside-bottom of the impeller...not the inside. (see Step 5 diagram). If the spindle has fallen out, it most likely implies that the seal has deteriorated. It may continue to leak, until replaced. Once you have installed the seal as shown, everything holds in place. My machine was the Kenwood BM450. Please check the measurements for the BM250 pan, and procure the replacement seal. Best of luck!

    0
    jameswong6590
    jameswong6590

    Reply 4 weeks ago

    Is there an O-ring attached to the gap (pointed by the red arrow) on the spindle? What is the purpose or function of the gap?

    20200818_135830.jpg
    0
    solarboyy
    solarboyy

    Reply 4 weeks ago

    I suppose there is a rubber o-ring there to prevent leakage, but I am not sure now as I scrapped this machine a while ago. You can try fitting it, but see that the oil seal fits properly. Have you procured the oil seal yet?

    0
    jameswong6590
    jameswong6590

    Reply 4 weeks ago

    Thanks very much for the information.

    0
    jameswong6590
    jameswong6590

    Reply 5 weeks ago

    Photos for reference.

    IMG-20200815-WA0026.jpgIMG-20200815-WA0024.jpg
    0
    ariesoh1020
    ariesoh1020

    Question 3 months ago

    Thanks for sharing!
    I'm stuck at 1st step, been trying very hard but no way to remove spindle from bucket, any tools recommendation?

    0
    solarboyy
    solarboyy

    Answer 3 months ago

    Hi Ariesoh, You will have to extract the spindle first..Normally held by a Circlip from from pan bottom..you will need a Circlip plier to remove/re-fix...then remove the old seal. Model/Make of your machine? Can you post a picture of your seal? (inside/outside of pan) Try reversing the assembly procedure shown in slide- Step 5: Fit the Impeller and Circlip From the Underside ..refer to diagram in slide 5

    0
    Mouldy old dough
    Mouldy old dough

    4 months ago

    Very useful instruction, thank you. Only problem is that aliexpress don't ship this item to the UK! Teying to source a similar item locally. A company called simplybearings do an 8x18x7 in the UK so I'm going with that.
    Thanks again though for sharing tis idea..

    1
    saiko
    saiko

    7 months ago

    Thank you Solarboyy for sharing this!
    My BM450's pan started leaking recently and there's no replacement bread pan is available in my country so this post is really helpful.
    I noticed that the existing shaft seal mentions 8-19-8 on it - does this mean that it's actually 8mm ID 19mm OD and 8mm thickness?
    Here's an image of the existing seal from my faulty breadpan: https://imgur.com/1HwGZla

    0
    solarboyy
    solarboyy

    Reply 2 years ago

    Hello Luissm,

    I ordered the spare from China, and am not sure about the food grade specification of the part. All I can say is I used it regularly without any side effects. You can probably check with the supplier you plan to buy from.

    0
    Luissm
    Luissm

    Reply 2 years ago

    Hi Solarboyy,

    Thanks, and the resitance of 200ºC is ok?

    I think you have order from the https://fsmorc.pt.aliexpress.com/store/1368091

    I asked they about this kind of shaft seal, for food contact and they answering me that they don't have.

    I will try another sellers to find one who have this.

    A good news is that you are still a live :) signal that the rubber of your shft seal don't kill you ;)

    0
    _mesika
    _mesika

    Reply 9 months ago

    Very helpful !! thanks !!

    I'm also worried about the food grade of these seals since I have small kids.

    Have you come up with a solution? have you find any food grade seals?

    0
    BenB163
    BenB163

    3 years ago

    Ordered all the parts. Gonna try this :)

    0
    solarboyy
    solarboyy

    Reply 1 year ago

    200ºC should be OK. Voton appears to be food grade, so it is OK. Yes, still alive!

    0
    onemanclpping
    onemanclpping

    1 year ago

    Fantastic. Worked perfectly. Thank you so much.

    image.jpg