I bought a kit for the trailing arm, long shaft, brass bush which will have to be reamed, the kit does not have the roller bearing does this need replacing ?also the kit comes with a long plastic tube is this just for packing ?How is the brass bush removed? Confused P7676

I'd be checking with your supplier about the contents of the kit. The caged needle roller bearing should be there. The plastic tube that you have assumed is packing is the lube tube. The brass bush will need to be removed by pulling or reaming.

Throw the plastic tube and use the original metal one. If you get the needle roller bearing out remove tube long drift tap out bronze bush

Needle bearing is best removed with a puller.
There are details in the how to forum how to make a split collet one.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

P7676 - and others, how did you go with this job in the end? I'm about to tackle the same job.

I've got 2 questions before diving in -

1. I'm a bit confused about the reaming, the kit supplied states the bush will need to be reamed. I assume that is the new one, and if so, what tool do I need or this fairly precision part to be done well?

2. removal tool for the needle bearing - can that be be performed with the tool described in this thread,

viewtopic.php?f=3&t=86822&p=951550&hilit=front+needle+bearings#p951550

I made one up using the same concept and it worked great on the front needle bearings. It's basically a punch modified to slip between the bearing and recess in the arm.

Cheers for the input.

Mat

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1970 Mk2 Cooper S

I seem to remember a thread where Mick showed exactly what to do and the tools required to do it. Might be in the how to section.

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt

Note the correct needle bearing for the trailing arm is uncaged. These have more rollers and higher static load capacity than caged ones. Caged bearings are better in high speed applications which this is not.
Throw away the plastic tube if you still have the original steel ones. The plastic ones are rubbish, when they crack the whole arm casting fills with grease instead of lubing the needle bearing.

[edit] To remove the bush, I screw a 7/8 UNC tap into it halfway and then knock it and the bush out with a hammer and a bit of rod.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks for the input and the link to Mick's very detailed post.

The bushes in the arms are already different from each other. One has the spiral lubricating groove (as per the kit bush), while the other consists of dots in a grid pattern - see images below. The fit between the shaft and bush feels good, with a good fit. The reason i'm doing this job is because the needle bearings on one side especially has worn grooves into the shaft and so replacing the shaft and needle bearing is a must.

Would it be okay to just replace the needle bearing in this instance? Or, while the unit is out, just do the lot? Is it possible to extract the bearing without removing the bush anyway?

I could borrow a reamer and I'm up for it. (Opinions wanted)





Cheers

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1970 Mk2 Cooper S

There is an in depth article here on rebuilding rear arms
http://mk1-performance-conversions.co.uk/rad-rep.html

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I made a split collet tool to remove the needle bearing, details are in the how to forum.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I saw that post drmini, looked perfect. After pricing up a no9 reamer and talking with my local mini man, and his opinion on the existing bushes, I’ve decided to ask him to do the job. I feel somewhat defeated but think for a once off job I’ll sleep easy knowing it’s right.

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1970 Mk2 Cooper S