Changing Crank Pulley

DannyR · Jan 19, 2012

Need to change my standard crank pulley to a keywayed Megane one. Do I need to lock everything in place?

I would of thought not as the timing part of things isn't moving, just undoing the bot out of the middle of it. Obvious I will have to lock the flywheel or crank so I can torque the crank bolt up but the main thing is do I nee to lock the timing.

Cheers
Danny

MicKPM · Jan 20, 2012

top end no, bottom end yes... but be bloody carefull.

Are you changing the bottom sprocket also or are you just running the outer solid pulley?

Dan519 · Jan 20, 2012

do the job exactly as you would a full cambelt change.

DannyR · Jan 20, 2012

Only changing outer pulley as the Crank is already keywayed, so won't this mean that the timing belt will stay in place on the crank?

I'm not going against what saying just trying to get my head round why I'd need to have the timing tools etc...

scotty2hotty81 · Jan 20, 2012

DannyR said:
Only changing outer pulley as the Crank is already keywayed, so won't this mean that the timing belt will stay in place on the crank?

I'm not going against what saying just trying to get my head round why I'd need to have the timing tools etc...

What mick says, the sprocket has no key way either, As soon as you remove crank pulley you lose timing, I think...

DannyR · Jan 20, 2012

But why? Doesn't the crank have the teeth on that keeps the timing. The Pulley for the aux parts is just bolted on is it not?

Dan519 · Jan 20, 2012

DannyR said:
Only changing outer pulley as the Crank is already keywayed, so won't this mean that the timing belt will stay in place on the crank?

I'm not going against what saying just trying to get my head round why I'd need to have the timing tools etc...

slightly confused by what you're asking now. The sprocket that the cambelt runs on is the part that is keyed on the megane engine, the pulley is not keyed on either the meg or the clio. If you're changing the bottom cambelt sprocket/pulley then you have to lock up the whole lot

DannyR · Jan 20, 2012

So there are two parts that unbolt but together using the one bolt?

Dan519 · Jan 20, 2012

yes, the bolt clamps the 2 pulleys together and when fully tightened stops them both moving

scotty2hotty81 · Jan 20, 2012

You want a keyed sprocket (what the cambelt runs round) no danger of the timing slipping then.

DannyR · Jan 20, 2012

519 Automotive said:
yes, the bolt clamps the 2 pulleys together and when fully tightened stops them both moving

Cheers Danny, I knew there was something I was missing.

What would you charge for cambelt and key way (Megane 225) pulley fitted?

Dan519 · Jan 20, 2012

need some details really. Guessing you dont want a full aux kit as you're charging the engine?? what setup are you running at the moment?

DannyR · Jan 21, 2012

It won't need full aux kit, just the belt for piece of mind as tensioner will be off virtually straight away and cost of a belt being f**k all it'll be worth it for the month or so before it comes off.

I'm currently running standard setup with AC. Will be supercharging current engine and then the engine I'm building. So ideally want cambelt done on current with keyway pulley which will then be changed later on to the new engine.

Andyman · Jan 21, 2012

Is it worth fitting a keywayed Megane pulley on a stock non forced induction engine if say your having a cambelt change for the added peace of mind?

Dan519 · Jan 21, 2012

DannyR said:
It won't need full aux kit, just the belt for piece of mind as tensioner will be off virtually straight away and cost of a belt being f**k all it'll be worth it for the month or so before it comes off.

I'm currently running standard setup with AC. Will be supercharging current engine and then the engine I'm building. So ideally want cambelt done on current with keyway pulley which will then be changed later on to the new engine.

Renault parts system is down so can't price the megane pulley up this minute, but I think it's about £35, £350 plus the pulley sounds about right

Dan519 · Jan 21, 2012

Andyman said:
Is it worth fitting a keywayed Megane pulley on a stock non forced induction engine if say your having a cambelt change for the added peace of mind?

If the bolt is torqued correctly then it shouldn't ever be an issue, to be honest I've done several that have ended up supercharged and they've not been problematic either. If you read the manual there's a contradiction on tightening procedure, I always use the tighter version

DannyR · Jan 21, 2012

My first one was never a problem but it's for piece of mind more than anything as they are known to randomly do it!

Not a bad price then!

Dan519 · Jan 22, 2012

managed to get on the parts system, the megane sprocket is £44.33

DannyR · Jan 22, 2012

Awesome, is that all that's needed then plus the bolt? Different aux pulley not needed?

Fred@BTM · Jan 22, 2012

i'd go for the 182 crank bolt with the 225 pulley, aux stuff inc aux pulley remains as 172/182

DannyR · Jan 22, 2012

Is the keyway part not part of the bolt? I have no idea how this works! So anyone that can make an awesome paint drawing would be cool!

Do you do on site cambelts Fred

Andyman · Jan 22, 2012

Its basically a cog with a raised lug inside which slots into a groove on the end of the crank. The normal 172 / 182 one just slots on and doesn't have a locating lug

DannyR · Jan 22, 2012

So only the inner sprocket is actually keywayed as such and basically slots into the crank?

Fred@BTM · Jan 22, 2012

^yes, it's identical to the 172/182 one but just has a nobble built into it to slot onto the crank

Fred@BTM · Jan 22, 2012

DannyR said:
Do you do on site cambelts Fred

yes i could, but it wouldn't be cheap!

DannyR · Jan 22, 2012

Probably cheaper to bring you the engine!

Dan519 · Jan 22, 2012

nothing special needed, the megane sprocket just has a woodruff key, you're still running everything else clio so no need for anything else to change

DannyR · Jan 22, 2012

Is the woodruff key a separate part?

marinemackay2003 · Jan 22, 2012

hope it helps
:approve:

from bombers thread

http://www.cliosport.net/forum/show...g-Slut-of-a-Ph1/page21&highlight=megane+crank

mark123 · Jan 22, 2012

Can't you just buy a woodruff key and slot it into the crank and the sprocket, as the std sprocket has a slot machined in anyway?

E.g. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCX14

Not suggesting this is the right one just thought the picture would help people visualise.

DannyR · Jan 22, 2012

Awesome, cheers mate!

So the one laying flat is megane one, other is standard clio

mark123 · Jan 22, 2012

Here's shot from when I did my 182 cam belt. If I'd realigned the slots I could have slotted a woodruff key in, job done?

View attachment 70283

Dan519 · Jan 22, 2012

mark123 said:
Can't you just buy a woodruff key and slot it into the crank and the sprocket, as the std sprocket has a slot machined in anyway?

E.g. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCX14

Not suggesting this is the right one just thought the picture would help people visualise.

no, the slot on the crank doesn't match the slot in the sprocket. French

mark123 · Jan 22, 2012

519 Automotive said:
no, the slot on the crank doesn't match the slot in the sprocket. French

Thanks Danny.

marinemackay2003 · Jan 22, 2012

So the one laying flat is megane one, other is standard clio

as far as im aware yes

Andyman · Jan 23, 2012

Yeah - ignore the first crank picture tho as most shouldn't have that. Sure that one is a Laguna item ?

Stock 172 / 182 has a groove right to the tip of the crank as per post 32

Dan519 · Jan 23, 2012

Andyman said:
Yeah - ignore the first crank picture tho as most shouldn't have that. Sure that one is a Laguna item ?

Stock 172 / 182 has a groove right to the tip of the crank as per post 32

F7R 714 crank. I'm almost positive of it. I compared it when i rebuilt one a few months back

BRT Motorsport · Feb 8, 2012

Dan@519Automotive said:
If the bolt is torqued correctly then it shouldn't ever be an issue, to be honest I've done several that have ended up supercharged and they've not been problematic either. If you read the manual there's a contradiction on tightening procedure, I always use the tighter version

anyone tell me where i can get manual for bottom of engine, (block)

BrianB · Jan 10, 2013

Andyman said:
Its basically a cog with a raised lug inside which slots into a groove on the end of the crank. The normal 172 / 182 one just slots on and doesn't have a locating lug

Sorry to bump an old thread but does anyone know the part number for the megane item with the raised lug??

scotty2hotty81 · Jan 10, 2013

Don't know the number, when I ordered mine I went into renault with a meg 225 reg and ordered it that way.

Changing Crank Pulley

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