Why would this crack?

schmollball · Dec 13, 2018

I recently purchased a 2016 M8000 Ltd 153. Stoked on the sled as I'm upgrading from an 09 m8. I have been going through it just to inspect and make sure everything is ready and while cleaning the clutches I discovered that the plate between the two clutches is cracked. I ordered a new one but am curious if this is a common problem, or if there is a deeper root cause that I should be looking in to? It is part #29 in the following part diagram.

https://www.countrycat.com/arctic-c...D_RELATED_PARTS_[102631]/S2016M8HPSUSG/102631

Thanks for any input.

summ8rmk · Dec 13, 2018

Its common.
My 14 has broke 2 in 2,300 miles.
I am looking into something better. Maybe the Ctec plate will work?

jim · Dec 14, 2018

Poor design. You have too much material removed and a sharp radius where the material has been removed...this creates a stress concentration and once a crack starts, it grows fast. That is also the middle of the structure where the greatest torque forces will be seen. Plus vibration.

kiliki · Dec 14, 2018

I have gone threw a few. replace #5 at the same time and it will live a lot longer.

boondocker97 · Dec 14, 2018

summ8rmk said:
Its common.
My 14 has broke 2 in 2,300 miles.
I am looking into something better. Maybe the Ctec plate will work?

2017 MC and Ctec plate is the same part #. Since the 2017 used the Suzuki engine it should work on other older proclimb models. The catch is the jackshaft bearing housing is different on 2017 MC and up. Uses fewer bolts and the new plate and bearing housing is lighter overall by 3/4lb. That's according to cat specs. Waiting for mine to arrive to install.

Edit: 2014 plate is still intact at 2000 miles with my big bore. If you've broken one dig out a clutch alignment bar and make sure your engine is sitting square with the secondary.

summ8rmk · Dec 14, 2018

Engine mounts were solid last yr and Clutches aligned. Only put 170 miles on since everything was checked.
Does the newer bearing housing work with the older jack shafts? I have an expensive jackshaft in the sled.

Vern · Dec 14, 2018

Still on my original link at 27xx miles on my '14, got a small crack in it 3-400 miles ago and I just drilled a small hole at the end of the crack. Hasn't progressed any since, we'll see how far she goes.

boondocker97 · Dec 14, 2018

summ8rmk said:
Engine mounts were solid last yr and Clutches aligned. Only put 170 miles on since everything was checked.
Does the newer bearing housing work with the older jack shafts? I have an expensive jackshaft in the sled.

The clutch side bearing is the same part number for 2014 and 2018 so I don't see why it won't work. Maybe have a slightly different offset, but anytime I mess with anything on the clutch side I just expect to have to re-align things. I have a BDX Ti shaft sitting on the bench to go in along with the newer plate and housing. I'm expecting to get it and do the install sometime next week so I'll be able to tell you for sure then.

summ8rmk · Dec 14, 2018

Vern said:
Still on my original link at 27xx miles on my '14, got a small crack in it 3-400 miles ago and I just drilled a small hole at the end of the crack. Hasn't progressed any since, we'll see how far she goes.

Did u take the plate off and drill the back side also?
I am sure both sides are cracked.

Vern · Dec 14, 2018

summ8rmk said:
Did u take the plate off and drill the back side also?
I am sure both sides are cracked.

Nope, just drilled all the way through from the front side and hoped for the best on the back side.

kiliki · Dec 14, 2018

boondocker97 said:
The clutch side bearing is the same part number for 2014 and 2018 so I don't see why it won't work. Maybe have a slightly different offset, but anytime I mess with anything on the clutch side I just expect to have to re-align things. I have a BDX Ti shaft sitting on the bench to go in along with the newer plate and housing. I'm expecting to get it and do the install sometime next week so I'll be able to tell you for sure then.

thinking I did have them next to each other and no way to make them mate up without the 17 up secondary backing plate

High Flyer · Jan 7, 2019

Mine is cracked also. Was planning on just keeping an eye on it and see if it gets worse or not

Frostbite · Jan 7, 2019

Do any of you have a picture of where this crack is located on the plate?

You've all got me thinking that I need to look as well.

summ8rmk · Jan 7, 2019

Here are 2 links

sledhead685 · Jan 8, 2019

kiliki said:
I have gone threw a few. replace #5 at the same time and it will live a lot longer.

I think this mag side mount is suspect. I had the clutch side plate on my 16 crack and replaced under warranty last december. I replaced the mag mount at the same time then as it was pretty cheap and easy, and found it was destroyed. Just last month I checked that one year old mag side mount and it was destroyed again (probably 1000-1500 miles), clutch side plate is still good though. I'm thinking for less than $30 the mag side mount will be a yearly maintenance thing for me, and hopefully that makes the clutch side plate last.

boondocker97 · Jan 8, 2019

Might be good to replace the bolts with that mag side mount once in a while and/or check tightness. Just found one snapped off in the block on mine the other day. 2000 miles.

Joe.G · Jan 11, 2019

How do you replace the Mag side mount, # 5 I have the mount and bracket was just wondering if there are any tips. Is it easier to change it with the bracket or change just the mount?

kiliki · Jan 11, 2019

Super easy just undo the bolts Slide the mount out the put the mount back in and put the bolt back in

Joe.G · Jan 12, 2019

Ill have to look at it again,but doesn't the recoil run though it ? I have to undo the cord also correct?

kiliki · Jan 12, 2019

No recoil it's just one bolt it slides in and slides out super simple. Takes longer to get the tools out and the hood off. About a .010 beer job

Why would this crack?

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