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Author Topic: M90 Loose Crank Shaft Bearings ?  (Read 2768 times)

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Re: M90 Loose Crank Shaft Bearings ?
« Reply #15 on: February 07, 2020, 02:53:29 pm »
Hello.
I have long noticed the defect in the bearings
For this I made phosphorous bronze rings and installed oilers.
The engine makes a much more pleasant noise.
Regarda from Geneva.
Christian.
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Re: M90 Loose Crank Shaft Bearings ?
« Reply #16 on: February 07, 2020, 02:55:39 pm »
Very nice Christian
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Nick

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Re: M90 Loose Crank Shaft Bearings ?
« Reply #17 on: February 08, 2020, 09:49:52 am »
Well done, Christian, on your lubrication & bearing improvements ! Can you reveal what size & type drill bit you used to drill thru the hard cylinder sleeve ?  I need to impliment a piston oiler like yours. Thx, tom.
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Re: M90 Loose Crank Shaft Bearings ?
« Reply #18 on: February 09, 2020, 01:29:44 am »
Hi,
Can these replacement bush's also be used on the silver vertical engine. I think its called the M91.
The engine crankshaft has the same looseness and noise as described above .
Thanks
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Re: M90 Loose Crank Shaft Bearings ?
« Reply #19 on: February 09, 2020, 03:39:33 am »
Hi Hurric123,
The needle rollers fitted are standard metric diameters for which you can get oilite bushes or even ball bearings in the same diameters from bearing suppliers.  The bushes i listed are for 8mm crank, 12mm crankcase bore and are 8mm wide.
Hope this helps
Ade
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Re: M90 Loose Crank Shaft Bearings ?
« Reply #20 on: February 10, 2020, 06:39:43 am »
Quote from: yozhek on February 07, 2020, 11:51:26 am
Hi Gil,

I am in the UK so used UK supplier Simply Bearings   https://simplybearings.co.uk/shop/Bearings-Oil-Filled-Bronze-Bushes-Oil-Filled-Bronze-Plain-Bushes/c3_4511_4770/index.html
I used these AM0812-8 Oil Filled Bronze Plain Bush 8x12x8mm or SKF PSM081208A51 Plain Sintered Bronze Bush Bearing 8x12x8mm for direct replacement or these AI0508-06 Oil Filled Bronze Plain Bush 5/16x1/2x3/8 inch if you want to ream the bush and bearing housing to a really snug fit.
The bearing housings will accept 12x10 but i could only get 12x8 but the needles are about 8mm wide inside the cage so pretty much the same.

Kind regards
Ade


Thank you, Ade!
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Re: M90 Loose Crank Shaft Bearings ?
« Reply #21 on: February 24, 2020, 03:33:56 pm »
Quote from: 70Rcode on February 08, 2020, 09:49:52 am
Well done, Christian, on your lubrication & bearing improvements ! Can you reveal what size & type drill bit you used to drill thru the hard cylinder sleeve ?  I need to impliment a piston oiler like yours. Thx, tom.

Hi
I drilled the cylinder to add an oiler
With normal drill and cutting oil
You have to turn slowly
but, I still used 2 wicks.
Christian.
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