What is crank pully wobble on VXR8's LS3?
Discussion
The inner part of the pulley is bolted to the crank. The outer part of the pulley, with the ribs is bonded/glued to the inner part of the pulley. Looking from the front you'll see a raised area of black rubber, that's the bond. It's as deep as the pulley, so quite deep. If you see cracks in the rubber then it's time to consider fitting a new pulley but it's not usually a crisis if you don't. A strobe light will show if the outer part has a wobble due to the bonding perishing.
Boosted LS1 said:
The inner part of the pulley is bolted to the crank. The outer part of the pulley, with the ribs is bonded/glued to the inner part of the pulley. Looking from the front you'll see a raised area of black rubber, that's the bond. It's as deep as the pulley, so quite deep. If you see cracks in the rubber then it's time to consider fitting a new pulley but it's not usually a crisis if you don't. A strobe light will show if the outer part has a wobble due to the bonding perishing.
Thnaks fo rthat quicjk response, Boosted.I guess this is something my local independent garage could check and also fit?
Can you suggest where a replacement pulley could be obtained; does the outer part have to be bonded after the inner part is bolted? If so that seems like a difficult process to reliably control.
SteveMJ said:
Thnaks fo rthat quicjk response, Boosted.
I guess this is something my local independent garage could check and also fit?
Can you suggest where a replacement pulley could be obtained; does the outer part have to be bonded after the inner part is bolted? If so that seems like a difficult process to reliably control.
It's bonded as supplied. If you replace it you'll need to fit a new bolt after using the old bolt or a threaded bar to install the damper onto the crankshaft. Then you tighten it down using the new bolt. The torque/angle procedure is quite specific.I guess this is something my local independent garage could check and also fit?
Can you suggest where a replacement pulley could be obtained; does the outer part have to be bonded after the inner part is bolted? If so that seems like a difficult process to reliably control.
Basically as above. Only option is replacement.
The bolt will be F*king tight to get off and may need a locking tool on the flywheel.
It will need a suitable puller to remove the pulley from the crank.
And ideally make up a puller to press the new one on via a piece of M16 threaded rod. I would not recommend using the bolt to try and press it n as you risk damaging the crank threads but some may have done it.
And new bolt is recommended when re-fitting and it needs torqued to silly torques. Again a locking tool on the flywheel may be needed.
The bolt will be F*king tight to get off and may need a locking tool on the flywheel.
It will need a suitable puller to remove the pulley from the crank.
And ideally make up a puller to press the new one on via a piece of M16 threaded rod. I would not recommend using the bolt to try and press it n as you risk damaging the crank threads but some may have done it.
And new bolt is recommended when re-fitting and it needs torqued to silly torques. Again a locking tool on the flywheel may be needed.
Hmm,
Same supplier, two parts with same description (different order of words) different costs?
It seems it is not an easy part t oreplace, I'll see what the local garage thinks after their inspection. I am inclined to leave it until Mokfish have car at its next service.
Thank you all for the guidance and advice.
Steve
Same supplier, two parts with same description (different order of words) different costs?
It seems it is not an easy part t oreplace, I'll see what the local garage thinks after their inspection. I am inclined to leave it until Mokfish have car at its next service.
Thank you all for the guidance and advice.
Steve
SteveMJ said:
Hmm,
Same supplier, two parts with same description (different order of words) different costs?
It seems it is not an easy part t oreplace, I'll see what the local garage thinks after their inspection. I am inclined to leave it until Mokfish have car at its next service.
Thank you all for the guidance and advice.
Steve
It's explained perfectly clearly the difference.Same supplier, two parts with same description (different order of words) different costs?
It seems it is not an easy part t oreplace, I'll see what the local garage thinks after their inspection. I am inclined to leave it until Mokfish have car at its next service.
Thank you all for the guidance and advice.
Steve
One is brand new, the other is a "new" takeoff from a crate engine. SO could be deemed used and would have no box etc.
stevieturbo said:
Been a few posts here about them on the VXR8's
It sounds unusual though. Are GM doing the bonding wrong for these engines? Or is there some reason why they have an issue, maybe some extra load or climatic issue? Back in the 'old' days I saw some truly knackered looking RV8 pulleys that just kept soldiering on. You'd think that 30 years later they could make a balancer that works properly.Boosted LS1 said:
I never knew that these engines had an issue with balancer wobble but I guess it could happen with age or high miles? OP, are you throwing drive belts or wearing them out? What symptons of an issue do you have?
Never been aware of any problem on mine, Monkfish mentioned this at last (and maybe one before) service; just checked my old notes, this was frst mentioned in 2011, so I guess not a problem yet.. No belts have ever come off (excepting air con one once, then idler was changed in August 2011).Whilst I'm typing this I am thinking its no big deal.
Stee
Boosted LS1 said:
It sounds unusual though. Are GM doing the bonding wrong for these engines? Or is there some reason why they have an issue, maybe some extra load or climatic issue? Back in the 'old' days I saw some truly knackered looking RV8 pulleys that just kept soldiering on. You'd think that 30 years later they could make a balancer that works properly.
And you'd think the French could make cars that werent pieces of s
t. But they still are ! lolWho knows what the reason is, but it's an issue that has been reported enough that it is common.
stevieturbo said:
And you'd think the French could make cars that werent pieces of st. But they still are ! lol
Who knows what the reason is, but it's an issue that has been reported enough that it is common.
Ha ha, the french are in a league of their own and we all know it. ;-) maybe GM Monaro's have french pulleys.t. But they still are ! lolWho knows what the reason is, but it's an issue that has been reported enough that it is common.
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