Is the bottom pulley supposed to run true?

[ARAF]

Never noticed before, but the bottom pulley (on the crank) doesn't seem to run true. Both the pulley and the bolt don't seem to be central to the crank.

The pulley doesn't seem to wobble, and the nut doesn't seem to be loose. Is this normal, and I just haven't seen it before, or should I take the belts off, and look into it further?

[MyM8V8]

Nah.Try specsavers.

[ringram]

If this is a convoluted way of convincing the wife that you need to pull the pulley off so that the cam cover accidentally falls off causing you to decide that the cam looks worn and needs replacing then. "Yes Ian, it sounds like you need to fix the problem"

[snowwolf]

Funny thing is I was looking at my bottom pulley this morning thinking it like it was running out, think it was just marks on the face of the pulley making look like it was, mine has had the key modification.

My landcruiser bottom pulley ran out slightly but it was like it for 255k miles !!!!!! I had to change the serpentine belt a bit more often than normal,

[007 VXR]

ringram said:

If this is a convoluted way of convincing the wife that you need to pull the pulley off so that the cam cover accidentally falls off causing you to decide that the cam looks worn and needs replacing then. "Yes Ian, it sounds like you need to fix the problem"

[ARAF]

ringram said:

If this is a convoluted way of convincing the wife that you need to pull the pulley off so that the cam cover accidentally falls off causing you to decide that the cam looks worn and needs replacing then. "Yes Ian, it sounds like you need to fix the problem"

I have a very understanding wife. A cam is on next year's list.

[stevieturbo]

ARAF said:

Never noticed before, but the bottom pulley (on the crank) doesn't seem to run true. Both the pulley and the bolt don't seem to be central to the crank.

The pulley doesn't seem to wobble, and the nut doesn't seem to be loose. Is this normal, and I just haven't seen it before, or should I take the belts off, and look into it further?

Really depends how much wobble you're talking about.

But absolutely it should run true, but in reality there might be very slight runout. But this should only be very slight.
The front pulley is usually a damper style, with bonded rubber between the main body and the rubbed section, so sometimes this sees some movement. But it should barely be visible.

[ARAF]

stevieturbo said:

ARAF said:

Never noticed before, but the bottom pulley (on the crank) doesn't seem to run true. Both the pulley and the bolt don't seem to be central to the crank.

The pulley doesn't seem to wobble, and the nut doesn't seem to be loose. Is this normal, and I just haven't seen it before, or should I take the belts off, and look into it further?

Really depends how much wobble you're talking about.

But absolutely it should run true, but in reality there might be very slight runout. But this should only be very slight.
The front pulley is usually a damper style, with bonded rubber between the main body and the rubbed section, so sometimes this sees some movement. But it should barely be visible.

I can see it when the engine's running, so it's probably a couple of mm out at most. I'm sure I can also see the centre bolt moving as well - but that may just be an optical illusion because of the pulley moving, though it looks as if the bolt head isn't central to the crank.

[MatrixXXx]

Mine does the same , checked the bolt and it was tight , it didn't look like it was putting any stress on the belt so I left it, 50k later no problems.

[ARAF]

Yes, I spoke with Monkfish yesterday, and they advised that it's often the case that the pulley doesn't run perfectly true.

Like you, I popped a 24mm socket over the pulley bolt last night for reassurance, and it just started to turn the engine, so I guess it is tight.

[SturdyHSV]

ARAF said:

Like you, I popped a 24mm socket over the pulley bolt last night for reassurance, and it just started to turn the engine, so I guess it is tight.

Don't take the piss, that's how we have to start our Monaros you know

[ARAF]

SturdyHSV said:

ARAF said:

Like you, I popped a 24mm socket over the pulley bolt last night for reassurance, and it just started to turn the engine, so I guess it is tight.

Don't take the piss, that's how we have to start our Monaros you know

I was half expecting you to say "My pulley runs true"

I was going to suggest you take the car in to have it replaced for a wonky one, as it's obviously not right.

[breakdown]

This is a common fault with ls engines - spoke to the fish about a year ago re air con belt mod. They asked if c/shaft pulley out of true-yes- very slightly. new pulley required-mod- and it takes a serious puller to remove old pulley. mine still has wobble-minimal. but will have to be done in near future.ouch.