Mid Timing Belt change Question (Doh!)

[ldavies83]

Just putting everything back together and I think my crank pulley is duffed, the outer ring that houses the alternator/water pump belt is moving independantly of the rest of the pulley. Is this normal?? I ask because the notches for timing are completely up the duff now!


I want to drive my car again :p

Cheers,

Leigh

[kevin..in]

yep it's nackered I just had this problem its caused by the belt over heating(slipping due to water pump/ alternator bearings gone or just poor adjustment) and burning the rubber damping in the pulley bad news is £200.00 plus vat from Mr"T" got mine from crazylegs but I know he's been after one himself for a while with no luck. have to try emailing all ebay breakers but be careful I got one from the scrappy only to find on close inspection that was knacked too

[ldavies83]

Double Doh!

Would the pulley off a Same age Corolla GTI fit do you think? I remember my brother did an engine swap and left his old 4age engine round my uncles whom I happen to be visiting this weekend!

[feral4mr2]

all the 4age variants have the same crank snout, so the crank pulley will fit on either engine/s.
just measure the OD of the pulley to see if it's the same OD as yours. the 4agze uses a larger OD (145mm) pulley than that of the 4age (umm.. cant remember what it was 130-135mm?). (not that running a different sized OD on a na engine would make a great deal of difference).

[ldavies83]

Thanks for that, your absolutely right, just double checked on club4ag.com, 4age aw11 diameter was 131mm (close!) and 4agze was 146mm and there was a whopping 1kg difference between the 2 pulleys in weight!! No wonder you can buy lightened pulleys for the ZE

[kevin..in]

all the 4age variants have the same crank snout, so the crank pulley will fit on either engine/s.
just measure the OD of the pulley to see if it's the same OD as yours. the 4agze uses a larger OD (145mm) pulley than that of the 4age (umm.. cant remember what it was 130-135mm?). (not that running a different sized OD on a na engine would make a great deal of difference).

the corolla pulley will fit ok but it doesnt have the timing marks on so you will have to find TDC and mark the pulley

[Icsunonove]

Leigh,

I have a pulley off a 4AGE. It's not in brilliant condition, I think it has some chips on the outer ring. I bought it because I thought the inner pulley was the same diameter for the 4AGE and 4AGZE, well it isn't!

I was going to press off / machine off the outer ring and make myself a big supercharger pulley. Well I'm not now so it's spare. I'll try and find it and post a pic up if you're interested.

Post back if you aren't already sorted and I'll take that pic.

Another idea would be to drill two off M6 threads half and half and fit some grade 12.9 grubscrews, like this:



Then you would have to re-mark the timing marks on the pulley, but that's not difficult at all

[ldavies83]

Thanks guys for the help, I've put the feelers out for some prices of a new pulley from Jinxy. Icsunonove Thanks very much for the offer, very tempting, could I wait and see come this weekend as I'll see this engine again (after about 3-4 years!) and I can work out if it indeed will work.

It seems like the same engine in every respect (from what I can remember!). I think it was G Reg, one of those smaller corolla's, had a 4age with TVIS attached to it. I couldnt tell you how many "ribs" it had.

icsunonove, your idea about the grubscrews I fear my technical abilities may not be up to scratch to start drilling precision holes, but I think I see where your coming from!

[MartG]

Thanks for that, your absolutely right, just double checked on club4ag.com, 4age aw11 diameter was 131mm (close!) and 4agze was 146mm and there was a whopping 1kg difference between the 2 pulleys in weight!! No wonder you can buy lightened pulleys for the ZE

Remember the GZE pulley is actually 2 pulleys in 1 - one drives the alternator and aircon, the other drives the water pump and SC - hence the difference in weight. The GE just has one pulley which drives the alternator and water pump.

[Icsunonove]

icsunonove, your idea about the grubscrews I fear my technical abilities may not be up to scratch to start drilling precision holes, but I think I see where your coming from!

Ha ha ha! There's nothing precision about it at all!!!

Just centre pop a hole on the interface line. Then use a 5.0mm drill and drill to a depth of, I dunno 12mm. Then tap it M6 and fit and Locktite a grubscrew in. Do this in two places and bob's your uncle.

Then you just need to remark the timing marks in the new position, that not's difficult either.....

[Icsunonove]

The GE just has one pulley which drives the alternator and water pump.

Are you sure? I thought the alternator and water pump were driven by independent belts (might be totally wrong on that though)

[MartG]

The GE just has one pulley which drives the alternator and water pump.

Are you sure? I thought the alternator and water pump were driven by independent belt (might be totally wrong on that though)

Googled a pic of the GE and checked before I put that post up, so yes, fairly sure. Remember that on a GE the alternator is at the back of the engine ( ie. where the SC is on a GZE ).

[Lauren]

The GE just has one pulley which drives the alternator and water pump.

Are you sure? I thought the alternator and water pump were driven by independent belt (might be totally wrong on that though)

Googled a pic of the GE and checked before I put that post up, so yes, fairly sure. Remember that on a GE the alternator is at the back of the engine ( ie. where the SC is on a GZE ).

Yes alternator and waterpump are driven by the same belt on a GE. The alternator is where the SC is on a GZE.

[Icsunonove]

Ok, sorry Leigh, I haven't got a spare pulley then God knows what it's off then?

(Mental note to me - don't get involved with 4-AGE questions, you don't know what you're talking about )

[feral4mr2]

our 4age's have 2 lots of belts just like the 4agze, as we have the a/c driven on the front belt..

[kevin..in]

icsunonove, your idea about the grubscrews I fear my technical abilities may not be up to scratch to start drilling precision holes, but I think I see where your coming from!

Ha ha ha! There's nothing precision about it at all!!!

Just centre pop a hole on the interface line. Then use a 5.0mm drill and drill to a depth of, I dunno 12mm. Then tap it M6 and fit and Locktite a grubscrew in. Do this in two places and bob's your uncle.

Then you just need to remark the timing marks in the new position, that not's difficult either.....

when I was looking for a pulley I enquired about trying to repair mine Paul woods said this was a definate "NO NO" as as pulley that was not 100% secure may shatter sending bits of shrapnel flying about! think about its position in relation to the driver and exploding at up to 7,000 RPM so best not to try and repair

[Icsunonove]

Found knackered pulley that I was told was off a 4AGE. Here it is:





I am almost certain that the hub is correct to fit on my 4AGZE. So it will fit on a 4AGE. As you can see it is a double pulley and it appears a belt has been running on both pulleys. Anyone got any ideas what it's off?

And Kevin, now I see what Paul's on about, I didn't understand how it was constructed, it's totally impossible to do the grubscrew bodge, there's actually an intermediate rubber layer!

[kevin..in]

Found knackered pulley that I was told was off a 4AGE. Here it is:





I am almost certain that the hub is correct to fit on my 4AGZE. So it will fit on a 4AGE. As you can see it is a double pulley and it appears a belt has been running on both pulleys. Anyone got any ideas what it's off?

And Kevin, now I see what Paul's on about, I didn't understand how it was constructed, it's totally impossible to do the grubscrew bodge, there's actually an intermediate rubber layer!

this looks like the correct pulley and it has aw11 timing marks if a belt has been on both pulleys it must be JDM spec with aircon the outer pulley does the aircon and on corollas with power steering it does the PS pump too

[jrleech]

I'd read somewhere that it's worth changing the 'key' on the timing belt pulley when you change the cambelt, as it wears, and once it starts to go, the damage to the timing belt pulley speeds up.



I'm about to undertake a cambelt change... is it worth replacing the idler pulley and spring on a 100k engine?

Cheers,
Jon

[Lauren]

Jon, I would change the idler pulley if there is any play in it whatsoever. On a 100K engine I would do it tbh.

Only change the key if there is play.