37 replies to this topic

[WiredbyWilson]

Is this a damper type crank pulley?


It says it is off of a 970 cooper s so would it fit a 1275 A+??

Sorry for stupidity but i have no idea as you can guess when it comes to pulleys and their inter-changeability!

[Jordie]

I believe it will fit and looks like a normal pulley to me, by normal i mean 1275 damper type.

[GraemeC]

Be aware that the pulley off the Austin 1100, 1300 etc looks identical but the timing notch is in totally the wrong place for a Mini. I know - I have two of them!

Looking at the pulley face (ie the side the crank bolt head would be) and holding the pulley wth the key way at 12 o'clock then the timing mark must be around the 10 o'clock position, not the 2 o'clock position.

[WiredbyWilson]

thanks for replies.

Graeme - would i be right in assuming you could always make your own timing notch in the pulley?? If so are you looking to seel either of yours haha

[Nightrain]

Timing marks are in the same place on the Austin 1100/1300, yours are of something else most probably and inline engine (moggy, midget etc). That isn't a 970 S pulley as the S's had a much better arrangement as standard.

[WiredbyWilson]

Timing marks are in the same place on the Austin 1100/1300, yours are of something else most probably and inline engine (moggy, midget etc). That isn't a 970 S pulley as the S's had a much better arrangement as standard.

Ok so how do you tell, and can you tell me what pulley it is off of?

[GraemeC]

Mght be off inline engines - just know they're not right on a Mini and cause much head scratching before you realise what's up!

The 970S pulley (or the S pulley in general) was a bolted together 2 piece unit. The one pictures is more the standard pulley fitted to 1275s.

You could remake the mark in the right place - once you knom the engine was at true TDC then file or cut a small mark in the pulley adjacent to the pointer on the timing cover. Make sure that it is easily identifiable as the 'correct' notch by marking it with some white paint or similar so it shows up better under the strobe.
I would happily sell one but would need to work out postage costs etc as they aren't light!

[Nightrain]

because I've got several and if the timing marks where at 2 o'clock how would you time it up, because the Austin 1100/1300's where frontwheel drive and there timing pointer is on the cam chain cover same as a mini so they wouldn't line up they'd be about 90 degrees out.
The Cooper S pulley is a 2 piece part, the actual damper bolts to the pulley and it is of a much larger diameter. Minispares reproduce the S damper do a search and have a look, you'll see what I mean.

[WiredbyWilson]

I know minis-spares do a re-pro of them - but have seen the costs also!! the one above has what appears to be a thread in it, so maybe it does bolt together. The thing is i want to know if i could make it work on my 1275 A+ as currently i have no crank pulley

[Nightrain]

Threaded hole is for a puller to remove the pulley, I can assure you that is not a 2 piece pulley. Yes it will fit you 1275 in fact it'll fit any A series/A+ enigine. If you've not got one you really need one it's a very bad idea to run without a damper.

[mini_turbo_pete]

The pully's with the notches in the wrong place are Maestro ones as the engines are back to front in the cars.

[WiredbyWilson]

Threaded hole is for a puller to remove the pulley, I can assure you that is not a 2 piece pulley. Yes it will fit you 1275 in fact it'll fit any A series/A+ enigine. If you've not got one you really need one it's a very bad idea to run without a damper.

I know it is a bad idea, but atm it won't be running at all as i don't have apulley! So will keep an eye on it unless Graeme wants to weigh one of his and work out postage

[Nightrain]

The pully's with the notches in the wrong place are Maestro ones as the engines are back to front in the cars.

As I said above there inline engines used in lots of models one of which is the maestro.

[mini7boy]

Is this a damper type crank pulley?


It says it is off of a 970 cooper s so would it fit a 1275 A+??

Sorry for stupidity but i have no idea as you can guess when it comes to pulleys and their inter-changeability!

Your question is not a stupid one. Many others would have to ask it as well.

Whether or not it will fit a 1275, do yourself and your engine a favor by not installing that rubbish. This
damper has obviously not been cared for at all and is in appalling shape, totally unfit for duty...on any engine, even a 970.
The critical thing about damper health is the condition of the plastic layer that is between the two large metal pieces of the damper
It is this plastic which largely determines the damper's operating behavior. The plastic usually drys and cracks with age, thus relegating the
damper to the bin unless the damper is completely disassembled and rebuilt by a professional who REALLY knows what he is doing.
Additionally, dampers are "tuned" from the factory for the particular engine they are to be used with.

Even if this damper was brand new, it would be inadvisable to install it on a 1275. The 970 and 1275 have vastly different strokes and
thus torsional vibration behavior and magnitude. Just as you wouldn't remove a flywheel balanced for one engine and install it on another,
don't use a damper designed for one engine size and install it on another. Believe it or not, you could cause a broken crankshaft
by so doing. Vizard had some information in his TBASE books in the section in or near where he talks about building "big engines"
The need for a damper really goes way up as the stroke increases. KAD recently brought out a brand new damper of their own design
so that they could mitigate the savage vibrations of their 1400+ engines.

If you want to use a damper on a 1275, and you should, the best thing to do is buy a new one. But if the cost is unbearable, the next best
thing would be to buy a used one in great condition whose plastic layer looks like it has no cracks visible and has not hardened
due to age and or exposure to high temperatures. If you decide to spend for a new one, you might find that a good quality aftermarket
unit is a better unit than a replacement factory piece. There are several companies, like Romac of Australia, which make the
aftermarket dampers. None of them are cheap, but neither is a factory unit. Alternatively, you might locate a firm that can sell a GOOD QUALITY
rebuilt factory damper. Good luck.

Edited by mini7boy, 24 February 2009 - 07:24 PM.

[1984mini25]

I believe it will fit and looks like a normal pulley to me, by normal i mean 1275 damper type.

The few 998s I have striped for parts had both the slim pulley without the damper and the one pictured with the damper.