6 replies to this topic

[Pauly]

Morning all,

Has anyone had any problems with the latest A+ koyo idler bearings? Fitted one into my transfer case and it's a bit of a faff to get the idler in it, it's like the shaft on the idler is too big for the bearing, but with a bit jiggling it slides in. Once it is in it spins free and is a snug fit. When I fit the idler in the box and try and put the transfer case on that's when I get problems, because the idler gets caught up on the bearing in the case, after a bit more of a faff it goes on but it's the bearing causing the problem.

I think the needle rollers are to blame because once you have had the gear in it will slide in and out no problem. Have I brought a dodgy bearing? I can't remember them being that awkward to fit, you can usually slide them straight on.

[sledgehammer]

I'm guessing on all this as I havn't seen it ...

 

has the gear shaft got a small slight bevel on it , to aid fitting , is it smooth or does it have a slight edge ?

 

when the idler on it's own - does it spin freely in the bearing after fitting ?

 

does it start tight - then free up ?

 

was there any marks in the casing ?

 

wondering if the casing has been distorted while fitting ? 

 

two choices - fit another new one - or fit & hopefully forget

 

seem a shame to rip out a nice tight idler bearing , that could give years of service

 

guessworks is probably the man to ask for better info

 

best of luck

Edited by sledgehammer, 26 July 2014 - 10:07 AM.

[Stu1961]

I had this issue, the problem was a distorted bearing housing in the flywheel housing casting (Too much heat removing the outer race) if you can try and source a Torrington/RHP bearing they are out there, Koyo I think are of Czech origin so quality maybe suspect. Minispares were supplying these as an alternative to the Torrington/RHP at one time. Not sure if this is still the case.    

Edited by Stu1961, 26 July 2014 - 11:21 AM.

[Pauly]

Spins nice when in, bearing went in fine. Just brought another bearing from mini spares but seems the same, you need to get it perfectly square for it to fit, koyo must be manufacturing to tighter tolerances nowadays.

It's just a ball ache getting the casing on the box, when it's on the drops run fine

[Pauly]

I had this issue, the problem was a distorted bearing housing in the flywheel housing casting (Too much heat removing the outer race) if you can try and source a Torrington/RHP bearing they are out there, Koyo I think are of Czech origin so quality maybe suspect. Minispares were supplying these as an alternative to the Torrington/RHP at one time. Not sure if this is still the case.

This did cross my mind but it's doesn't bind when fitted?

Koyo have taken over Torrington now I believe?

Edited by Pauly, 26 July 2014 - 11:26 AM.

[Guess-Works.com]

I had this issue, the problem was a distorted bearing housing in the flywheel housing casting (Too much heat removing the outer race) if you can try and source a Torrington/RHP bearing they are out there, Koyo I think are of Czech origin so quality maybe suspect. Minispares were supplying these as an alternative to the Torrington/RHP at one time. Not sure if this is still the case.    

 

what a crock.....

 

 DSC_0338.jpg   73.98K   2 downloads

 

Koyo is Torrington which was Timken.... and in my lengthy time of using them never had a problem...

 

My suggestion is grease the bearing, even though a bearing does come with some lubrication on them, you should put some build lubricant on them or grease, not only does this help the rollers but without something there to hold the rollers they can drop slightly which could cause fitting issues. This is more apparent with the spigot bearing...

 

Another tip is when fitting the transfer case, make sure you have the primary gear on the crank, not only does this hold the idler gear in its correct position but allows you to turn the transfer gears as you install the case, which will then rotate the bearings, and it's a lot easier to put a shaft into a bearing of this nature while it's rotating... Same applies when installing the layshaft.

[Pauly]

Sorted it, it was the 1st motion nose bearing getting caught up on its outer race, turned the drop gears whilst pushing the case on and it slid home.

Cheers guys.