Crankshaft pulley issue during removal
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Crankshaft pulley issue during removal
First post, long time lurker. I started on the timing belt replacement today on my 98 4runner with the 3.4L and ran into an issue. I've done a lot of shadetree work on my cars in the past but this is my first timing belt.
I used a homemade SST to break loose the crankshaft bolt which used two pins that slid into the 3/8" holes on the pulley. After cranking on it, I felt a pop and figured it was the bolt but it turned out that the doughnut looking center part of pulley broke off. If its unclear, see the pic below in which I highlighted the section that separated. It looks like it's attached to the main part of the pulley with a rubber seal.
I managed to get the pulley off using the starter bump method but I have a few questions:
1) What is that center section? The damper?
2) Is the pulley toast? The crankshaft bolt clears the inside of the doughnut thing so I don't see any way of holding the doughnut on.
2) Should have I bolted the SST to the pulley to prevent this?
Thanks in advance.
I used a homemade SST to break loose the crankshaft bolt which used two pins that slid into the 3/8" holes on the pulley. After cranking on it, I felt a pop and figured it was the bolt but it turned out that the doughnut looking center part of pulley broke off. If its unclear, see the pic below in which I highlighted the section that separated. It looks like it's attached to the main part of the pulley with a rubber seal.
I managed to get the pulley off using the starter bump method but I have a few questions:
1) What is that center section? The damper?
2) Is the pulley toast? The crankshaft bolt clears the inside of the doughnut thing so I don't see any way of holding the doughnut on.
2) Should have I bolted the SST to the pulley to prevent this?
Thanks in advance.
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Yes, it is a rubber damper and, yes, the pulley is toast, AFAIK.
I doubt bolting the SST would have prevented it. Did the woodruff key in the crank break or round off?
I doubt bolting the SST would have prevented it. Did the woodruff key in the crank break or round off?
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Thanks for the quick reply. The woodruff key looked fine but i'll take a closer look at it tomorrow in the daylight. Guess I'll be hitting up the junkyards tomorrow...
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I checked the woodruff key, no damage.
See pics below for the actual crankshaft pulley and separated damper. The damper is just held on by a rubber seal.
When I was reading up on changing the timing belt, I saw several pulley holding tools that used pins, 3/8" drill bits, etc. It's obviously a really bad idea to rely on that rubber seal to hold up to the amount of torque required for the crankshaft bolt.
The starter-bump method worked great, broke the bolt loose on the first try. For torqueing the new pulley, I'll be bolting the pulley holder on or using a chain wrench if I can find one locally.
See pics below for the actual crankshaft pulley and separated damper. The damper is just held on by a rubber seal.
When I was reading up on changing the timing belt, I saw several pulley holding tools that used pins, 3/8" drill bits, etc. It's obviously a really bad idea to rely on that rubber seal to hold up to the amount of torque required for the crankshaft bolt.
The starter-bump method worked great, broke the bolt loose on the first try. For torqueing the new pulley, I'll be bolting the pulley holder on or using a chain wrench if I can find one locally.
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