M2 abc Irvine 40 sport

[trebor]

Just stripped out the small and large crank bearings due to being cream cracker'd and tried to get replacements locally. I was told the larger bearing was an odd size on the outer diameter.

The bearing part no is S-026 and mine measures 28.6mm. Nearest I can get is 28mm. Does anyone know the correct size. 

Edited By trebor on 23/03/2016 11:59:34

[Jimbo565]

Trebor

try here

**LINK**

[trebor]

Thank you. Looks like some one has put an over size bearing in a past life.

Edited By trebor on 23/03/2016 12:33:49

[..]

I thought you had that from new Bob ? The 53's we have done have sometimes had differing size bearings.

[trebor]

Not this one Justin, this is another one. I've got to stop buying secondhand stuff This one seems all metric appart from the outside dia of large bearing which is 28.6mm / 1/8". God knows where the bearing came from or weather it's been machined out. A standard 28mm just falls through crank case

[trebor]

Just contacted Model Fixings, Just engines and spent a long time looking online. Not much hope. Normal size is 15 X 28 X 7 mm. Mines just 28.6 mm made by Nachi, can't make out the rest of the numbers. The moral of this story is don't buy an old mk 2 Irvine which might have an imperial case and metric shaft.

[Shaunie]

get some 0.3 mm steel shim (Usafoil) and cut a strip to go around the outside. Use some bearing retainer if necessary. If you can't get the correct bearing the engine is scrap anyway, so what's to lose?

Shaunie.

[Bob Cotsford]

Can you get the case machined to take a 30mm bearing?

Edited By Bob Cotsford on 23/03/2016 16:32:50

[trebor]

Thanks for the ideas, the case has only 33mm across outside so not much left after machining for larger bearing. Shims might do then again I could put it on eBay

[Lee Damms]

Trebor, I have the latest Irvine's and certainly the 46 and 53 have imperial at one end of the crank and metric at the other . Even model fixings qoute in metric tho ie. 9.525mm this is actually 3/8in. If it doesn't measure whole mm then 10 to 1 its an imperial bearing.

Regards Lee

[Lee Damms]

Forgot to say your 28.6mm is 1.125inches 1.1/8in

Lee

[trebor]

Forgot to put the 1 " in

Edited By trebor on 23/03/2016 19:40:39

[Steve Hargreaves - Moderator]

If I remember correctly the Irvine 40 did have a non standard rear bearing.....it may even have been a special size just for Irivine. You could buy "modified" standard bearings with a strip of steel fitted around the outside.....but I think you'd be lucky to find one now.....Just Engines might be your best bet.

Good luck...

[Martin Dance 1]

I recollect that at one time OS routinely used imperial rear bearings and metric front bearings on quite a number of their engines. Might be worth exploring an OS specialist or OS themselves. Wasn't the engine you are referring to made by OS?

[Nigel R]

**LINK**

 

rear bearing listed as 1 1/8" x 15mm

 

best of luck finding one, its an odd size

 

it might be easiest to find a bust 40mk2 to salvage the bearing from.

 

Edited By SuperNash on 24/03/2016 09:23:15

[Martin Harris - Moderator]

When I enquired about spares for my 1976 40 back around 2002 (which still has its original bearins!), Irvine mentioned that their standard procedure with the by then unobtainable hybrid bearings was to replace them with the next size up ID and machine a sleeve to fit the shaft.

[trebor]

Thats the first place I have seen it written down. I have the original paperwork and there is only just a part no mentioned.

Solent Bearings in Southampton have been a great help, they have located one somewhere but there source wants nearly £50 + £8 postage so for now I have put the bits in a box If i win the lotto I might splash out.

[Engine Doctor]

If your Irvine is an OS product you may have a problem. OS and other makers have in the past had bearings of special sizes made for their engines and are only available from them . The main bearing on the OS 120 twin was a"manufacturer only" as was the main bearing on one of the YS 140 . It may be that the Irvine is the same . The use of imperal front bearings is common practice with many makes as they are readily available and very cheap.

It was possibly OS' way of fazing out the Irvine brand a bit quicker so that their own brand engines were more attractive in the UK.

[Nigel R]

E.D.

trebor's Irvine will be from the '80s if it is a mk2.

Posted by trebor on 24/03/2016 09:27:15:

Solent Bearings in Southampton have been a great help, they have located one somewhere but there source wants nearly £50 + £8 postage

ouch!

PS if you want to sell the jetstream carb, I will take that bit of it.

[trebor]

Is there anyway to tell if its an OS product ? All its got on the white and yellow box is R/C ABC Irvine Mk 11 40 England.

To be honest it looks better quality than the newer ones !!

[J D 8]

Hi trebor, Have an Irvine 40 mk2 you can have for a few beer tokens.Its from the early 90s in a yellow and white box with jet stream carb.It is well used with little compression, however bearings run smooth with no play. I agree these were better made than later ones.PM me if interested.John.

[trebor]

I thought mine felt smooth till I got it revving up it sounded like pebbles stuck in your old hub caps.

[Nigel R]

Mk2 sport were definitely the Irvine product. And they were a quality motor - Irvine were a good brand in their own right, before they were used as the budget department of another manufacturer.

When OS took over when they were all red anodised. However, if it's red and says "made in england" its pre-OS.

[trebor]

I,ve put a picture up due to the casting being slightly different to the one in previous link.

[Martin Harris - Moderator]

That will be an Irvine made one - some of the later red versions were (are?) produced by OS (did I hear they were made in China?)

Sorry about any duplication - caught out by the new page since I last had my PC open!

Edited By Martin Harris on 24/03/2016 14:03:01