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MED Ultra light steel Flywheel
https://www.ausmini.com/forums/viewtopic.php?f=5&t=93102		 Page 1 of 3
Author:  dalmeny [ Sun Jul 10, 2016 11:49 am ]
Post subject:  MED Ultra light steel Flywheel
Anybody that was in the paddock at Hay would have heard the Twinky start. It made everybody look.

Pulled the starter out to inspect, though it could have been a dead starter. But, a lot more was revealed, the gear on the starter did show signs of wear, but everything seemed to turn smoothly. A close look at the flywheel revealed the real problem. In one section the starter gear was running across the top of the flywheel teeth. End result one dead MED U/L steel flywheel and maybe starter if the gear can't be changed.

Both the MED flywheel assembly and Hi torque starter were purchased from MED as a pre-engaged "set". (approx 2.5 years ago)

Has anybody had a similar issue with the MED u/l flywheel?

In the good section of the flywheel doesn't appear to be a lot of snug mesh. (disregard the nut behind the starter gear it was put there to engage the gear for photos)
Image

In the bad section tops of teeth worn off.
Image

Hi-Torque starter from MED but probably chinese.
Image

What do you think has caused the damage?


Thanks
Author:  fuzzy-hair-man [ Sun Jul 10, 2016 12:48 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
Is it just me but there looks to be a fair bit more clearance between the clutch housing and the flywheel teeth in the 2nd photo than in the first, it could just be the camera angle.

Not sure about the MED flywheel but don't starter rings get sweated on? ie heat it up till it expands then put the ring on the flywheel as it cools it tightens and locks.

Would it be possible to compare starter gears with a genuine one or something? the starter looks centralised in the hole so maybe the starter gear isn't big enough?
Author:  drmini in aust [ Sun Jul 10, 2016 1:42 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
Looks to me like the pinion is too small, it is not meshing properly even in the top photo. In the bottom photo it has chewed the tops off the ring gear teeth due to this same thing.
IMO, the ring gear looks to be too soft if this happens. I have seen some recent ring gears get bad wear with low mileage after installation.
Maybe its material or heat treatment is crap.
Author:  Mokesta [ Sun Jul 10, 2016 5:25 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
I think that the starter has the mount holes drilled in the wrong spot. This has put the starter centre line too far away from the flywheel centre line. Poor mesh has allowed the tips of the gears to collide leading to the damage. Ring gears are always damaged more in one spot. It is where the engine tends to stop with the same piston on compression.

M
Author:  kiwiinwgtn [ Sun Jul 10, 2016 5:53 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
Pinion gear looks like the wrong profile.

May I ask what filter housing are you using. Looks non mini.

Kiwiinwgtn
Author:  FNQ [ Sun Jul 10, 2016 6:30 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
i have seen a number of MED ultra lite flywheels and no problems as such, quite a good bit of kit in my opinion, but that is not to say production variables don't exist. Regarding pre -engaged vs interia- would they have differing chamfers for 10 vs 9 tooth pinion, just a possibility No idea really
Author:  simon k [ Sun Jul 10, 2016 8:15 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
yep, sounded very yukky!

I'd send the photos to MED and ask them... maybe they'll send you a new set
Author:  dalmeny [ Sun Jul 10, 2016 9:03 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
kiwiinwgtn wrote:
Pinion gear looks like the wrong profile.

May I ask what filter housing are you using. Looks non mini.

Kiwiinwgtn


Just a Ryco Z418 on a spin on housing.
Author:  dalmeny [ Sun Jul 10, 2016 9:05 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
Mokesta wrote:
I think that the starter has the mount holes drilled in the wrong spot. This has put the starter centre line too far away from the flywheel centre line. Poor mesh has allowed the tips of the gears to collide leading to the damage. Ring gears are always damaged more in one spot. It is where the engine tends to stop with the same piston on compression.

M


The circular shoulder on the starter fits perfectly into the flywheel housing hole.
Author:  dalmeny [ Sun Jul 10, 2016 9:08 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
FNQ wrote:
i have seen a number of MED ultra lite flywheels and no problems as such, quite a good bit of kit in my opinion, but that is not to say production variables don't exist. Regarding pre -engaged vs interia- would they have differing chamfers for 10 vs 9 tooth pinion, just a possibility No idea really


I assumed the suppler would supply bits that work together. Been in touch with MED waiting for a reply.
Author:  dalmeny [ Sun Jul 10, 2016 9:10 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
simon k wrote:
yep, sounded very yukky!

I'd send the photos to MED and ask them... maybe they'll send you a new set


Did that Simon, here's hoping!
Author:  FNQ [ Mon Jul 11, 2016 7:38 am ]
Post subject:  Re: MED Ultra light steel Flywheel
Can i count? Is that an 11 tooth pinion???
Author:  Boostedmini [ Mon Jul 11, 2016 1:42 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
Same, 11


Sent from my iPhone using Tapatalk
Author:  dalmeny [ Mon Jul 11, 2016 9:13 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
Yes, it's 11 tooth, but it is a pre-engage set up. What's normal?
Author:  KLAS [ Mon Jul 11, 2016 10:32 pm ]
Post subject:  Re: MED Ultra light steel Flywheel
i count 9 teeth, factory starter from 1998.
if needed, outside diameter is 25,4mm
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