upper gear bushing

[Motorhead]

Opened up my chain case to find a lot of gold coloured filings, top gear is toast bad. 1 1/2 turns out and 16oz of oil since sled was new.

800 km service, no evident wear on gear and oil was clean with no gold coloured filings, checked tension at 2300km and it was at 2 turns out, adjusted back to 1 1/2 turns now at 5000 km tensioner was at 2 1/2 turns out, top gear add some sludge built up between outer edge and clip.

Anybody had bushing go to where there was quite a bit of filings in the case?

When I found filings in my case, it was because of the stretched chain which caused my tensioner to be out at least 2 1/2 turns out. My aluminum filings were from the chain rubbing or slapping the internal post/nub. Add the fact that the stock 21 tooth top gear has such a small diameter, it allows the chain to cause damage during loose chain usage.

That damage is not really noticeable unless you take all gears and chains off. And that is the only time I have seen lots of filings, but unlike yours, my top gear bushings were not worn, just found loose chain!

 

[Crossfire12]

Coming soon you will be able to get brass fork pads that wont crack and fall off if pops out of gear. This will get you home because some of you know when the plastic pads break you have no more forward movement and only will go in reverse.

If stranded take out actuator, turn with flat screwdriver, rock sled and turn driver until engaged, put actuator back on limp home. Did this once on my 2012 make sure your switched to forward.

 

[WinderFab]

When I found filings in my case, it was because of the stretched chain which caused my tensioner to be out at least 2 1/2 turns out. My aluminum filings were from the chain rubbing or slapping the internal post/nub. Add the fact that the stock 21 tooth top gear has such a small diameter, it allows the chain to cause damage during loose chain usage.

That damage is not really noticeable unless you take all gears and chains off. And that is the only time I have seen lots of filings, but unlike yours, my top gear bushings were not worn, just found loose chain!

I took all the gears off, luckily I have no damage at all besides the top gear and lots of gold coloured filings lol..

 

[NYTurbo]

I took all the gears off, luckily I have no damage at all besides the top gear and lots of gold coloured filings lol..

Make sure you clean all the pretty gold crap out of everything especially the gear that slides back and forth. The old bushing material has a habit of sitting in the grooves and may hinder full lock up.

 

[WinderFab]

Make sure you clean all the pretty gold crap out of everything especially the gear that slides back and forth. The old bushing material has a habit of sitting in the grooves and may hinder full lock up.

Thanks will do..

 

[Motorhead]

I took all the gears off, luckily I have no damage at all besides the top gear and lots of gold coloured filings lol..

Great news hearing that all damage was confined to just a top gear! Must have been worn really bad to create those gold color filings you talked about.

 

[WinderFab]

Great news hearing that all damage was confined to just a top gear! Must have been worn really bad to create those gold color filings you talked about.

Only a few light marks on the plastic chain sliders that are in the cain chase cover.
Yes bushing is worn badly, i will try and put up a quick video this coming weekend on how bad it sits on the shaft.

 

[STAIN]

saw this on another site and thought it was interesting. hole in bushing can be aligned with hole in gear


Corrosion-Resistant Sleeve Bearings with Groove

Grooves on the inside of the bearing provide a flow path for lubricant, distributing it evenly along the bearing’s surface. The addition of iron and aluminum provides high strength and excellent corrosion resistance.

Note: Dynamic load capacity is the maximum load a bearing can withstand at a given shaft speed. If your application’s load and speed requirements are below the values listed, the bearing will work.

For technical drawings and 3-D models, click on a part number.

For
Housing ID Lg. Dynamic Radial
Load Capacity Lubrication Temperature
Range, °F Each
954 Aluminum-Bronze Bearings
For 1" Shaft Dia.
1 1/8" 1" 3,900 lbs. @ 60 rpm Required -350° to 500° 2924T56 23.90
1 1/4" 3/4" 2,900 lbs. @ 60 rpm Required -350° to 500° 2924T57 22.90
1 1/4" 1" 3,900 lbs. @ 60 rpm Required -350° to 500° 2924T58 24.59
1 1/4" 1 1/2" 5,850 lbs. @ 60 rpm Required -350° to 500° 2924T59 27.92
1 1/4" 2" 7,800 lbs. @ 60 rpm Required -350° to 500° 2924T61 32.67

 

[Renegade XRS 900R]

Another option is the top gear super bushing EBay item#124081821870.this custom bushing has. 50% more surface area than the stock bushing. Email is davidmoegle@gmail.com. He also sells Brass shifting forks to replace the original plastic ones.

 

[ClutchMaster]

saw this on another site and thought it was interesting. hole in bushing can be aligned with hole in gear


Corrosion-Resistant Sleeve Bearings with Groove

Grooves on the inside of the bearing provide a flow path for lubricant, distributing it evenly along the bearing’s surface. The addition of iron and aluminum provides high strength and excellent corrosion resistance.

Note: Dynamic load capacity is the maximum load a bearing can withstand at a given shaft speed. If your application’s load and speed requirements are below the values listed, the bearing will work.

For technical drawings and 3-D models, click on a part number.

For
Housing ID Lg. Dynamic Radial
Load Capacity Lubrication Temperature
Range, °F Each
954 Aluminum-Bronze Bearings
For 1" Shaft Dia.
1 1/8" 1" 3,900 lbs. @ 60 rpm Required -350° to 500° 2924T56 23.90
1 1/4" 3/4" 2,900 lbs. @ 60 rpm Required -350° to 500° 2924T57 22.90
1 1/4" 1" 3,900 lbs. @ 60 rpm Required -350° to 500° 2924T58 24.59
1 1/4" 1 1/2" 5,850 lbs. @ 60 rpm Required -350° to 500° 2924T59 27.92
1 1/4" 2" 7,800 lbs. @ 60 rpm Required -350° to 500° 2924T61 32.67

That same bushing without the grooves is what I’m running....$4

 

[sideshowBob]

I like the idea of having a channel for oil distribution machined into the bushing...it sure couldn't hurt.
I am starting to wonder if after a long lake or rail bed run we should be putting our sleds in reverse and backing up a bit to rotate the top gear and get some fresh oil in there...might help.
My bushing was obviously pretty dry and chattering on the jackshaft.

 

[ClutchMaster]

I like the idea of having a channel for oil distribution machined into the bushing...it sure couldn't hurt.
I am starting to wonder if after a long lake or rail bed run we should be putting our sleds in reverse and backing up a bit to rotate the top gear and get some fresh oil in there...might help.
My bushing was obviously pretty dry and chattering on the jackshaft.

View attachment 154976

Oil should be getting to the bearing through the three holes when driving, not sure how backing up would get more oil into the bearing?

Groved bearings are usually for grease distribution/retention, oil will flow much easier and should have no problem dispersing. Some guys have been shimming the gear tighter for alignment and say it’s been saving bearings. I think more than likely the tighter end gap is keeping more oil inside the bearing instead of spitting out the sides. I use a sand too fit bearing and you have too trim the length also. Maybe the tighter end clearance has been adding to longevity?

 

[yamamarc]

saw this on another site and thought it was interesting. hole in bushing can be aligned with hole in gear


Corrosion-Resistant Sleeve Bearings with Groove

Grooves on the inside of the bearing provide a flow path for lubricant, distributing it evenly along the bearing’s surface. The addition of iron and aluminum provides high strength and excellent corrosion resistance.

Note: Dynamic load capacity is the maximum load a bearing can withstand at a given shaft speed. If your application’s load and speed requirements are below the values listed, the bearing will work.

For technical drawings and 3-D models, click on a part number.

For
Housing ID Lg. Dynamic Radial
Load Capacity Lubrication Temperature
Range, °F Each
954 Aluminum-Bronze Bearings
For 1" Shaft Dia.
1 1/8" 1" 3,900 lbs. @ 60 rpm Required -350° to 500° 2924T56 23.90
1 1/4" 3/4" 2,900 lbs. @ 60 rpm Required -350° to 500° 2924T57 22.90
1 1/4" 1" 3,900 lbs. @ 60 rpm Required -350° to 500° 2924T58 24.59
1 1/4" 1 1/2" 5,850 lbs. @ 60 rpm Required -350° to 500° 2924T59 27.92
1 1/4" 2" 7,800 lbs. @ 60 rpm Required -350° to 500° 2924T61 32.67

Groves /oil path would help allot...imo
I bet it would keep a more consistent layer of oil between the shaft and bushing then just oil holes
Is there a part #

 

[sideshowBob]

Oil should be getting to the bearing through the three holes when driving, not sure how backing up would get more oil into the bearing

As we all know the upper gear only rotates on the jackshaft when in reverse...so my thinking is backing up will allow lubricant to be refreshed and spread over the bushing surface??

 

[KnappAttack]

Groves /oil path would help allot...imo
I bet it would keep a more consistent layer of oil between the shaft and bushing then just oil holes
Is there a part #

Can grind a grove in the bushing with a dremel and a small bit too if you think it would help. A lot cheaper than buying that expensive bushing pre grooved and drilled. I’ve thought about grooving but don’t see it helping in this case much. Maybe it would, try it and see. I just think there are other variables at play.