Live demonstration on Clutch Balancing - 2008 - 2011 Ski-Doo primary clutches average 15 grams of unbalance on the front plane and 2 to 5 grams on the back plane. Go to www.perksbalance.com and click on my youtube titled " Snowmobile riding out the Earthquake" I will give you a live demonstration !!!
Live Demonstration on Clutch Balancing
- Thread starter 7perk
- Start date
Live demonstration on Clutch Balancing - 2008 - 2011 Ski-Doo primary clutches average 15 grams of unbalance on the front plane and 2 to 5 grams on the back plane. Go to www.perksbalance.com and click on my youtube titled " Snowmobile riding out the Earthquake" I will give you a live demonstration !!!interesting......
I can understand how the clutch (s) can affect the wear on the crankshaft bearings. I have a 07 Renegade 800 HO PTEK that needs a new crank and bearings after just 3,000 miles. Seems like this issue affected many of Doo's 800 engines. Frustrating issue for the owners, no doubt.
Thanks for the video and explanations.
I can understand how the clutch (s) can affect the wear on the crankshaft bearings. I have a 07 Renegade 800 HO PTEK that needs a new crank and bearings after just 3,000 miles. Seems like this issue affected many of Doo's 800 engines. Frustrating issue for the owners, no doubt.
Thanks for the video and explanations.
A
Arctic Thunder
Well-known member
Not to discredit anything Perk has here but it sure looked like the tip of the indicator was actually bouncing off the clutch. I know the movement was excessive but with an extra .030" of bounce it gets bigger.
Also like wild child said "was the indicator mounted to the motor or the chassis. If the chassis you would see the movement in the motor mounts and such also.
Again great info Perk, keep it coming.
Thunder
I think the point of the dial indicator on the idling engine was just to show the movement created by an out of balance clutch, not necessarily the exact amount of movement.
Perk, can you post a video or give us some indication of how much movement would be seen on the same idling engine AFTER a clutch is balanced? And then after a complete rotating assembly/crank is balanced?
Also, do you have the ability to balance a QRS secondary/jackshaft assembly? Thanks!
Perk, can you post a video or give us some indication of how much movement would be seen on the same idling engine AFTER a clutch is balanced? And then after a complete rotating assembly/crank is balanced?
Also, do you have the ability to balance a QRS secondary/jackshaft assembly? Thanks!
Perk, another question for you. Do you find the newer TRA7's to be (generally) farther out of balance than '06 and previous TRA's? Thanks again!
Clutch balancing
The indicator is mounted on a 6" x6" steel pole next to the sled and the indicator remains on the clutch when running it. The centrifugal force caused by the unbalance is moving the indicator .100.
I can not balance the secondary clutch if the jack shaft is in place but if you can remove it then I can balance the secondary. And yes the newer primary clutches have a greater unbalance.
The indicator is mounted on a 6" x6" steel pole next to the sled and the indicator remains on the clutch when running it. The centrifugal force caused by the unbalance is moving the indicator .100.
I can not balance the secondary clutch if the jack shaft is in place but if you can remove it then I can balance the secondary. And yes the newer primary clutches have a greater unbalance.
Brew, I don't think the indicator would change after the clutch was balanced...according to Perk the original imbalance was caused by a slight bulge in the clutch which he does not remove... he compensates by altering weights in other surface areas of the clutch. The needle would still jump imo.
I'm probably off on this but ?? Idk
I'm probably off on this but ?? Idk
Perk, the Doo QRS and jackshaft are one piece/pressed together...I can send you a assembly this summer if you want to look into possibly setting something up to do these??? Will be sending you my primary when the season is over....at least one more ride, lots of snow still.
R
Red-eye
Well-known member
Is there any movement from the fact that the engine is running, even if it is balanced? eg. combustion itself, uneven combustion per side, uneven compression.
How about weak motor mounts magnifing your results?
Would a clutch have to be as new, as the wear and play in the outter sheave and internal parts give false readings?
Does the outter sheave stay balanced as it moves in towards the belt? Or does the movement of the roller arms change things as the move?
Wasn't the design of the dampener on the TRA supposed to help the unbalancing? ( your view )
Live demonstration
No change to the balance when the clutch is moving in and out. The clutch on the youtube has new parts in the clutch. The combustion and or exhaust both cause a shaking under the hood. But when the crank is balanced the centrifugal forces go away. Basically on my sled that 922 lb. bowling ball (on both sides of motor and opposite angles) at 8000 rpm is gone. Yes if your motor mounts are bad then yes the vibration will be worst.
No change to the balance when the clutch is moving in and out. The clutch on the youtube has new parts in the clutch. The combustion and or exhaust both cause a shaking under the hood. But when the crank is balanced the centrifugal forces go away. Basically on my sled that 922 lb. bowling ball (on both sides of motor and opposite angles) at 8000 rpm is gone. Yes if your motor mounts are bad then yes the vibration will be worst.Similar threads
