Post by: odu50 on February 24, 2020, 03:33:56 pm
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.
Post by: RedRyder on February 10, 2020, 06:39:43 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!
Post by: yozhek on February 09, 2020, 03:39:33 am
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
Post by: Hurric123 on February 09, 2020, 01:29:44 am
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
Post by: 70Rcode on February 08, 2020, 09:49:52 am
Post by: Nick on February 07, 2020, 02:55:39 pm
Post by: odu50 on February 07, 2020, 02:53:29 pm
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.
Post by: yozhek on February 07, 2020, 11:51:26 am
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
Post by: RedRyder on February 07, 2020, 04:31:54 am
Needle roller bearings always seem to have a lot of clearance, in most of the applications i have seen, so i would consider this normal. The needle rollers provide less friction and require much less lubrication than bush bearings so i guess this is why they are used on these engines. However metric oilite bushes are available from bearing suppliers that are a direct replacement and do make the engine sound much sweeter.
Kind regards
Ade
Hi Ade, Do you have a name, part number, and supplier name for the correct direct replacement oilite bearings?
Post by: yozhek on February 07, 2020, 04:07:44 am
That is the exact same thing i did to mine, it does make for a very quiet running engine, if a little messy.
I'm running mine on regular petrol with a bit of castrol R mixed. Castro R is a bit (ok a lot) overkill but i had a bottle laying around and it does smell nice :-)
Kind regards
Ade
Post by: 70Rcode on February 06, 2020, 10:04:08 pm
Post by: yozhek on February 05, 2020, 05:18:53 pm
Kind regards
Ade
Post by: 70Rcode on February 04, 2020, 08:49:33 pm
Post by: catman on February 04, 2020, 06:18:39 pm
Of all the roller and needle bearings that I have replaced over the years, I have never seen one that used oil for a lubricant. They have all been packed with grease. I see where many have added oil cups to the mains and as 70Rcode stated you might or might not get any oil to the needles. I plan to pack the Bocas with "Superlube" synthectic grease as that has worked well over the years on my trailer wheel bearings. I get thousands, if not tens of thousands of miles on well packed bearings,I would think one could go a long time with these small engines with grease packed mains.
Am I missing something about using oil on the mains?
Post by: 70Rcode on February 04, 2020, 10:27:42 am
fittings, consistant assurance of critical bearing lubrication seems "hit or miss", drip it down the mostly hidden bearing sides & hope nothing ever runs dry !! ... Initial running frequent bearing wear teardown checks might be a good idea to verify your particular lubricant type & application method is settled on. ..Yep, Gil..despite the bearing & gear backlash noise, it runs good ! ..Think i'll lower the fuel tank a bit to keep all tank levels running on mixer benturi suction to eliminate any possible full tank gravity flow fuel mixture variation effects. What a cool engine platform to try out various "improvement" H&M setup ideas !..Thx again, tom.
Post by: RedRyder on February 04, 2020, 06:10:27 am
The correct solid bearing material if anyone wants to try it is Oilite bronze.
Oilite is a porous bronze or iron alloy impregnated with oil.
Post by: 70Rcode on February 04, 2020, 02:53:31 am
definitely gonna leave some wear marks that won't "buff out" that a simple, less expensive plain bronze straight bushing (with or without self-lube features) will certainly eliminate. The usual spur gear mount spacing distance tolerance (> 0.001" for class 8 gears) seems needlessly exceeded & would really "bother" most owners of this really Cool almost flawlessly executed (for the most part) rare, affordably priced working masterpiece !! ...Maybe these production execution issues aren't pricing budget (what's another $25) or accidential design issues but rather an intentional, added value,
ownership mind stimulating, the gift that keeps on giving electro-mechanical challenges that keeps us busy in the workshop, correcting that "just one little thing" i can fix bonus !!
Post by: rodnoc on February 03, 2020, 11:31:27 pm
For those without a lathe, this vid shows a solid bearing mod. Can anyone identify what he used?
https://tinyurl.com/wbovwyb
Post by: Nick on February 03, 2020, 08:46:54 pm
Post by: Steamandoil (Tim) on February 03, 2020, 08:19:59 pm
Post by: rodnoc on February 03, 2020, 04:40:26 pm
..Anyone notice the very Loose main crank shaft bearings ??
Yes. It's the norm with the needle bearings. They do make a bit of noise.
Post by: 70Rcode on February 03, 2020, 11:40:53 am