Crankshaft Pulley Failure?

[dibber]

Has anyone had the same prob as me. Today all hell broke loose under the bonnet when I was sitting at a junction.

Popped the bonnet and noticed the alternator belt and air con belt were in a bit of a mess.. shredding at the edges.

I blipped the throttle and noticed the crankshaft pulley moving outwards by about half an inch!

Yikes. I have not stripped it yet but I can see the crankshaft pulley is now in three parts. Two cast parts bonded to a rubber damper or in my case not bonded.

We had a very cold night here last night so I reckon it must have been ready to go and with the cold making the rubber harder it just gave up. Had thought about rebonding it but if it failed it could lead to a right old mess.

Toyota want £150 + Vat to supply a new one plus the cost of a couple of new belts. I would be fitting it myself. The parts guy said he had never heard of one going.

Anyone know of any breakers I could try online? Its a 98 1.8 Manual

[gazza1286]

Ther rubber on the crankshaft pulley is only an insert. I can only imagine that is serves as some form of resonator. Is doesn't have any bearing on the integrity of the pulley wheel. Never heard of one going.

These guys may sell aftermarket pulley wheels:

http://www.fensport.co.uk/parts.htm

The Avensis range isn't listed but the dimensions of the pulley wheels is similar across the entire range. Eg - the 7A is the same as the 4A and that was used on the MK1 MR2

If you can wait a couple of days use these:

http://www.247spares.co.uk/toyota

Alternatively ring round the breakers yards.

I've use 'Jap Parts' - a local (to me) specialist breaker. They do mail order.

01642 672255 (stockton-on-Tees)

[dibber]

Thanks for the reply Gazza. I stripped it off tonight and its as I thought. The rubber was no longer bonded to the pulley. It had made a clean break as well leaving no rubber on the pulley side.

After giving it all a good clean I tried using superglue to bond it back together and it worked a treat. Its back up[and running and I will get some new belts over the weekend but I am going to replace the pulley anyway so i will check those links you posted.

Thanks again.

[Black Knight]

The rubber damper is only pressed into place. I suspect the glue solution won't last long.

The job of the damper pulley is two fold.

One is to drive the auxillary equipment via the belt.

The other is to absorb the torsional vibration in the crankshaft. The two cast pieces move relatively to one another and rubber absorbs the backlash and disipates it as heat.

Since it'll be getting an awful lot of torsional vibration I reckon it'll crack the glue pretty sharpish

[dibber]

The rubber damper is only pressed into place. I suspect the glue solution won't last long.

The job of the damper pulley is two fold.

One is to drive the auxillary equipment via the belt.

The other is to absorb the torsional vibration in the crankshaft. The two cast pieces move relatively to one another and rubber absorbs the backlash and disipates it as heat.

Since it'll be getting an awful lot of torsional vibration I reckon it'll crack the glue pretty sharpish

Pressed in place would certainly account for the lack of rubber residue on the inner face of the outer ring thoguh I find it hard to believe this would be the method used coming from an engineering background. Its not uncommon for rubber to be bonded to metal espcially in the likes of suspension bushing.

I used the 247 link that gazza posted and have a replacement coming early week. I would never have been happy with the "Glue" fix. Part cost me about 50 quid in the end from a breakers and 20 quid for new belts. I would rather have the piece of mind.

[Black Knight]

This has a summary of manufacturing mehods and includes interference fit of the damper ring in place

http://www.wilmink.nl/wilmink/produkt/Prec...ndCatalogue.pdf

Whilst not a toyota part it is the same method of manufacture

[dibber]

Very interesting read.. thanks for posting the link