Crank pully sanity check...

[21TonyK]

"My" common sense says this is knackered. The cracking means the pully has slight movement when you press it and it rattles a bit.

If I'm wrong and its cosmetic tell me before I order a new pully and belt....

Edited by 21TonyK on Friday 21st August 15:00

[stevieturbo]

I'm not familiar with that engine, but that would concern me too.

[21TonyK]

N47N... mini/bmw

[shtu]

I'd be changing that.

Another pulley for comparison, also well used but nowhere near the amount of crackage, https://www.ebay.co.uk/itm/135318227597

[stevemcs]

Yep that’s fooked, at some point it will depart the car. Change the belt, pulley and crank bolt. Corteco do a kit.

[Sardonicus]

Yep very common repair on that engine and that needs doing now before it totally de laminates if the dealer part too expensive Corteco are an OEM quality brand and cheaper than dealer parts , probably pop in a new front seal while your in there no special tools required to change either

[ComStrike]

Will sound like a big end has let go shortly

[21TonyK]

Shopping list then. New pulley and bolts plus a stretch/angle gauge. Belt and crank seal.

Cheers all.

[shtu]

21TonyK said:

stretch/angle gauge

Would personally just mark the bolt heads and eyeball any angle setting - it's a mini, not the space shuttle.

[Sardonicus]

shtu said:

21TonyK said:

stretch/angle gauge

Would personally just mark the bolt heads and eyeball any angle setting - it's a mini, not the space shuttle.

< This and hence why I said no special tools needed

[21TonyK]

Sardonicus said:

shtu said:

21TonyK said:

stretch/angle gauge

Would personally just mark the bolt heads and eyeball any angle setting - it's a mini, not the space shuttle.

< This and hence why I said no special tools needed

Excuse for more tat to fill the garage

Is it worth a seal tool kit off Amazon. Got an N47 and an N16 to do.

[dhutch]

Had one fail on an pug806 once.

Obviously it picked the moment the car was half a mile up a dirt track, in mega rural Somerset, 5hours from home on holiday with six people a 900l roof box and a lot of camping gear.

That was a sketchy drag being an AA transporter.

[21TonyK]

Well... that didn't go well.

Changed the pully over and put a new belt on it. No issue.

But... as the pully bolts were tightening the pulley itself was turning until it started to resist allowing the bolt to tighten fully.

Then the next one, the pully turned a little more, bolt tighten. Pulley revolves a bit more until it resists, next bolt

in all the fully probably turned once or twice, resisted then turned a bit more 2-3 times as the bolts tightened.

All back together again, engine spins over doesn't start.

I assume I've done something stupid and get it recovered to local garage who have just called

Timing jumped, probably cost more to fix than repair.

I (stupidly) assumed the timing would not be affected by the pully revolving and not locked in place as the bolts were tightened

More than bit angry with myself.

Edited by 21TonyK on Wednesday 9th September 17:19

[Richard-D]

21TonyK said:

Well... that didn't go well.

Changed the pully over and put a new belt on it. No issue.

But... as the pully bolts were tightening the pulley itself was turning until it started to resist allowing the bolt to tighten fully.

Then the next one, the pully turned a little more, bolt tighten. Pulley revolves a bit more until it resists, next bolt

in all the fully probably turned once or twice, resisted then turned a bit more 2-3 times as the bolts tightened.

All back together again, engine spins over doesn't start.

I assume I've done something stupid and get it recovered to local garage who have just called

Timing jumped, probably cost more to fix than repair.

I (stupidly) assumed the timing would not be affected by the pully revolving and not locked in place as the bolts were tightened

More than bit angry with myself.

Edited by 21TonyK on Wednesday 9th September 17:19

Tightening the pulley bolts is turning the crank in its normal direction of rotation, tensioning the chain on the correct (non-tensioner) side. If that caused the chain to jump it would happen every time you started the car.

[E-bmw]

^^^^ Wot 'e said.

Turning the crank pulley will just turn the crank, which in turn just turns everything else as it is all connected.

In reality what probably actually happenned but you didn't see it was each time you tightened a bolt it got to the point of higher compression & the bolt torqued up, then when you removed the torque wrench the pulley rotated back to a point of lower compression, then rinse-repeat for the subsequent ones.

Edited by E-bmw on Thursday 10th September 07:51

[21TonyK]

^^^ this is what it felt like but the pulley rotated past the point of resistance as the torque wrench clicked.

It felt to me (and I assumed) it was the engine turning over and resisting so it didn't worry me at the time!

Any suggestions? Basically the engine spins on the starter but doesn't fire.

[bangerhoarder]

Damaged crank position sensor or wiring while down there?

[21TonyK]

Its possible something could have been damaged.

To get easy access to the tensioner I supported the engine on a jack, undid the top engine mount and lowered the engine a couple of inches.

[Richard-D]

bangerhoarder said:

Damaged crank position sensor or wiring while down there?

That's at the other end

[Richard-D]

21TonyK said:

^^^ this is what it felt like but the pulley rotated past the point of resistance as the torque wrench clicked.

It felt to me (and I assumed) it was the engine turning over and resisting so it didn't worry me at the time!

Any suggestions? Basically the engine spins on the starter but doesn't fire.

When you crank the engine what can you hear? Does it sound like a nice, even rhythmic pulsing? A video would help here.

On the subject of what the garage said; maybe they're absolutely right and the timing is out. If the timing is out it won't be because of you turning the crank whilst doing up the pulley though. There are lots of knowledgeable guys that work in garages but there are way more clowns that have no idea how an engine works.