Took it to bits

[MichaelTorre]

Well I stripped my 4 speed TS 250 down to nothing.
Wanted to put in seals.

I find I need a crank bearing , kind of dry sounding and two trannsmission bearings, all on the
left side, those two are absolutely notchy. horendous. Can't believe the "PO" drove it that way.

Is this unusual for 16,000 miles ? There was gear oil in the case. piston, sleeve and crank look
nice, although getting the crank out of the left bearing was a fight. Despight applied heat.

Big reason for posting.... would you get the bearings at a bearing house,USA, or get
them as "spares" from England ? ? ? ? ?

And why on earth would anybody stake the right bearing on the transsmission
input shaft that rides in a blind hole ? : ( That made dissassembly, "a chore".

Is this typical for this vintage ???

Thanks for the help
Regards
Michael

[therealche]

Problem with very low mileage engines is that the bearing spends a lot of time in one position, oil drains off, little bit of corrosion at the top and bingo a knackered bearing. Plus the fact that the original bearings were not of the highest quality!

Mind you my best mate ( sadly no longer with us) bought a TS250/1 for a pint and a sandwich and rode it 200 odd miles home... it sounded like a cement mixer, but didn't get any worse. So he rode it round for another year or so until the noise was too much even for him, sold it to another friend, who ran it for a year before it finally got rebuilt

Get your bearings from a local supplier,but remember you need 3C bearings not the bog standard ones

[MichaelTorre]

Is 3C , a quality standard ?

What is a bog standard.......... must admit it doesn't sound good.
Michael

[arry_b]

3C is the amount of clearance in the bearing. That allows for a little expansion when the engine warms up without the bearing binding.

The bearings used are standard metric ones, dead easy to get hold of.

It's worth paying the few pennies extra and getting a good brand (such as SKF or FAG) rather than Chinese cheapies.

[Linegeist]

Be careful with buying bearings chaps, there are some dodgy Chinese imports out there badged to look like quality European products.

I'm currently in correspondence with Trading Standards out here over a wheel bearing for my VW Bora, bought from a local factor (with the instruction "I don't want a Chinese bearing thanks....") and that was badged with a German name and titling. However, when I checked on the Internet, the bearing had been imported and packaged from Ningbo by a UK company that then repacked them using the German name that they'd only registered in January - presumably for that purpose.

As a professional engineer I should have known better and specified a bearing by manufacturer - such as Skefco or Timken. You live and learn ...........

[MichaelTorre]

Should I bother doing rings ?
At 16,000 miles the bore looks very good.
Hate to toss parts that work in harmony.

Michael

[therealche]

Wouldn't bother if it all looks good, just glaze bust the cylinder... which I do whenever I have a barrel off anyway!

[MichaelTorre]

I see a lot of very enthusiastic owners of MZ bike on the forums.

When I have the damage from the storage repaired can I expect a
fun long lasting well built bike?

Is a 4 speed 250 a keeper ?

I have owned and ridden motorcycles since 1973, and seen
a lot of funny stuff. Having been a successful mechanic for 27
years, I don't mind getting dirty if necessary.

But.
I like to ride ......not tinker ,which is why I avoid certain brands.
(bless their hearts)

M-

[stogadog]

If the gear box in a TS 4 speed is the same as in my ES (which I presume it is) it will take some getting used to! You will need to change very slowly and there is a huge gap between third and fourth, making fourth effectively an overdrive. However ,once you get used to it I'm sure it'll get under your skin!

[MichaelTorre]

One thing is bugging me though,
are they really serious about the hot plate routine ?
I meen to get the stuff 100C hot to
assemble ??

Michael

[DAVID THOMPSON]

i have worked on bmw off and on since the mid 1960's
and there is an electric oven in my work shop
as well as a fridge
very helpful when doing many steps
dave

[MichaelTorre]

OK, then I better collect those items.
Burwin has sent me a pretty heavy package !
M

[DAVID THOMPSON]

if the wife will not kill you and you do not do it often
kitchen is already equipped

my shop has lathe milling machine and a bunch of other stuff
oven does pizza when we can find any speedway or flat tracking on the tube
and the bottom of fridge is for the homemade brew a friend sends over
i stopped making it a long time ago as i do not drink enough of it to bother
drinking is not a good idea when running shop tools or bikes
dave

[MichaelTorre]

The oven worked so well!.
An intimidating job went very well.
I put a couple bags of frozen peas on the crank,
and even the transmission shaft to ensure a slip fit.

(does anyone eat frozen peas ?)

A am constantly amazed about the quality of thess machines,
(and I have been doing this professionally for 27 years)
M

[DAVID THOMPSON]

does anyone eat frozen peas ?)

i eat pea's
put them in a pressure cooker with 750 ml of water and cook at 10 psi for 5 minutes

lay a piece of cheese cloth on top so a loose PEA does not plug the jigglier weight

salt pepper and sliced onions some thin sliced potatoes
dave
if you have high sugar levels do not eat tooo many peas to often

pressure cooker = what we cooked with before the microwave became cheap...