I've got a stiffy!!

[bristolmod]

Just replaced the drive side mag seal and the main bearing seal on my smokey TV175S3 ~(bearings were fine)

Now find the engine is quite stiff to turn over by hand- is this normal these days? (Viton double lipped on d/ side- standard on mag).

Not had it running yet as crank cover not yet on.

No ominous scrapping sounds at all- just stiff.

Newness of seals?

Chris

[bristolmod]

just managed to get it running- briefly.

Defo something wrong somewhere as the engine "stiffens up" as it warms up.

The only thing I've done is to replace Main bearing seal and inner mag seal, although I did replace the Drive seal plate with another one I had knocking about- variable thickness??

So its strip down again and see whats what.

Any thoughts Gents?

One thing I noticed is when I tighten the front sprocket bolt the engine becomes hard to turn over- I did think this may be the new seals causing this but on reflection I think not. The bolt is obviously pulling the crank over and possible fouling the drive seal plate which is either not seated correctly or possibly thicker than the original??

Chris

[lambro]

I have issues with some of the halletite (spelling) washers.
The paper one behind the drive seal plate, 50% of the ones I get seem too thick causing the seal plate to be a gnats cock too proud.

Shaun.

[bristolmod]

I think thats the problem area Shaun- I'll rip it apart tomorrow and have a butchers again.

TBH it flew apart this morning with nothing awkward or seized- sods law I think they call it

Chris

[bristolmod]

was definitely the crank web touching the seal plate.

When I first stripped it down some round thin washers appeared from behind the main seal and I, in my ignorance, thought it may have been the seal itself breaking up.

Upon further investigation, these "washers" were in fact the remains of a throttle shim (the shaped one that holds the throttle open), so some bodger in the dim and distant past, was using that between the main bearing and the crank to allow more clearance ( I've subsequently found that MB do a range of correct washers to do that very job)

My query now is that these "spacers/ washers" are not shown in any original parts book, so were never used when the engines were initially built in Milan, so why the need all of a sudden for dealers to produce them?

Thicker Hallite washers?; thicker seal plates?

Another Innocenti mystery!

Chris

[joeswoonara]

suppose its a bit like clutch shims and gearbox shims are now produced in every thickness under the sun , is it the fact that we are using non-OEM parts on our scoots and tolerances vary from the originals or is it we are led to believe we need these parts so we comply?? i really don`t know

[HxPaul]

was definitely the crank web touching the seal plate.

When I first stripped it down some round thin washers appeared from behind the main seal and I, in my ignorance, thought it may have been the seal itself breaking up.

Upon further investigation, these "washers" were in fact the remains of a throttle shim (the shaped one that holds the throttle open), so some bodger in the dim and distant past, was using that between the main bearing and the crank to allow more clearance ( I've subsequently found that MB do a range of correct washers to do that very job)

My query now is that these "spacers/ washers" are not shown in any original parts book, so were never used when the engines were initially built in Milan, so why the need all of a sudden for dealers to produce them?

Thicker Hallite washers?; thicker seal plates?

Another Innocenti mystery!

Chris

These spacers do a good job of spacing the crank web away from the main drive seal plate,but when you use them you have to be careful that it doesn't push the crank to far in the opposite direction making the other web rub on the mag housing.

[bristolmod]

just to round this one off. Shimmed out the crank and have no issues with it now fouling anything on the mag side. Gone back to 3% from previous 4% and now everything running well with no smoke.

Might keep the scooter after all.............

Thanks to all for their input

Chris