(Home) Powersteering/crank pulley

dave/jim thanks for your quick responce taken floor pan out to have proper look to see whats going on started engine up and noticed that the pulley for fan belts on the crank shaft seemed to move side to side on shaft which most probably caused the powersteering belt to rip and come off so i took fan belts off and the pulley just slide off had a look at it but couldnt see any kind of securing/locating bolt so surely it shouldnt be like this should it the fan belts were a bit slack so maybe the belts should be real tight to keep pulley tight?

- (#14449) ian thomas, 7 Dec 04 07:36

I assume that this is a 2C engine with twin fan/alternator belts ? I think that you have been lucky and avoided the detached (and expensive) pulley drop off syndrome. No, the pulley tension does not keep the pulley located, there should be a bolt, screwed into the crankshaft, to secure the pulley. Also, is the key still in position and is there much wear in the pulley keyway?
For engines from 1988 to 1992 the part number for the bolt is 91511-61435 and the required plate washer 90201-14007. Your Toyota dealer should be able to help here.

- (#14449) John Davis (leics), 7 Dec 04 08:02

john thanks for quick reply its a 2lt engine 92 its got the two fan belts had another look cant see any bolt or even a hole for a bolt where would this bolt be ive even taken the power steering pulley off just cant see or feel anything and this plate washer is this positioned in between the p/steering pulley and fan pulley tried taking the pulleyof off the shaft to have a proper look but just cant do it would it undo clockwise sorry to be a pain

- (#14449) ian thomas, 7 Dec 04 09:14

No pain Ian and no problem. Are we talking about the main, crankshaft pulley ie, as per this extract from your original posting, "pulley for fan belts on the crank shaft seemed to move side to side on shaft" ?
Do you really mean that the three grooved CRANKSHAFT pulley cannot be moved ? If so, then it is securely mounted, on the crankshaft, by means of a securing bolt which screws into the end of the crankshaft. You should be able to see this bolt, right in the centre of the pulley. No, the bolt does not unscrew clockwise,(if you meant, is the pulley threaded, no it isn't) it is a right hand thread, on the bolt, and it unscrews anti-clockwise (quite often, on it's own as a number of owners have discovered).
You have taken the power steering pulley off, ie, removed the four bolts which attach it to the front of the crankshaft fan pulley. Can you not see a bolt head in the centre of the crankshaft? Has the bolt sheared, ie, the head has come away, leaving the threaded part still in the crankshaft? If this had happened, the crankshaft pulley would be able to be pulled of the crankshaft, especially as you previously mentioned that it moves from side to side on the crankshaft. Did you get your pulleys mixed up here ?
No, the securing bolt b& plate are not fitted between the P/S pulley and the fan pulley. There is a recess, in the fan pulley, and the bolt & plate sit in there.
If you still have problems, do come back and perhaps we can help with some illustrations. If you click on "To return to the homepage" above, then click on "Tasks", you will see an article about a pulley locking device. One of the images, contained in the article, will give you an idea how the pulley and it's bolt are assembled but, the illustration shows the older, single grooved crankshaft fan pulley. Yours is the later, double grooved type.

- (#14449) John Davis (Leics), 7 Dec 04 12:29

Sounds like you are describing what happened to me a couple of months ago. The crankshaft pulley has two metal parts, a central hub and an outer wheel which are bonded together by a thin layer of rubber. The whole affair is technically known as a harmonic balancer rather than a common or garden crankshaft pulley and it is meant to give a smoother ride. Sometimes the rubber gives way and you are left with two bits which run together on the friction created by the rubber. I hadn't noticed anything at the time but looking back I did tend to get heavy vibration at high speeds and when reversing slowly.

I stripped back the front of the engine and noticed a small oil leak from the oilpump front seal which I guess may have caused it, so replaced that, the crankshaft seal (while I was there) and cleaned the whole lot thoroughly with degreasant before sticking on a new timing belt.

I stuck the two halves of the pulley together with epoxy resin. Not ordinary araldite but some stuff my local factors had which claimed to be heat resistant to 200 degrees C so should be able to cope with the environment. It may sound like a bodge but if the genuine Toyota part gave way then why should that be any more reliable. Epoxies are incredibly strong things; the boats that run in the America's cup tend to be built mostly from epoxy resin.

Alternatively get the £200 pulley from Toyota.

http://www.mpvi.net/ia/ia4abg05.htm

- (#14449) Dave, 7 Dec 04 15:19

i think dave hit the nail on the head the twin fan belt pulley which is on the crankshaft pulley has come away from the crank shaft it slides off easily i did think of that by bonding it on that will be fine will it alot cheaper thanks again to all who helped

- (#14449) ian, 7 Dec 04 18:41

Yes, I am sure that Dave has hit the nail on the head. It is an unusual ocurrence and yours is only the second to be reported on this forum. I wonder if it is an age related failure and that we all ought to be inspecting this bond from time to time

- (#14449) John Davis (Leics), 8 Dec 04 04:10

Good point John. Dave thinks that oil may have caused it. It would help us if Ian can tell us whether there are siigns that oil had got on to the joint in his pulley.

- (#14449) Dave Mason (Sussex), 8 Dec 04 07:42

no no sign of oil leak what i failed to mention was when the fan belts snapped back in june i replaced all the belts (accept cam belt)which i mentioned first of all but did not say that afterwards there was a rattling noise/bearing gone noise i first thought it was btm a/con belt adjuster pulley rubbing against btm fan pulley did grind a/con pulley thinner to try and stop it but still had noise so i thought maybe bearing but now i think it was the loose btm fan pulley loose well i hope time will tell ill allow the bonding to dry let you no but again no sign of oil all bone dry but back to the point it may have just worn down or the engine got so hot but there is/was play on the pulley maybe about 1mm at the highest point with pulley on if you no what i mean but thanks all again couldnt of done it without your advice and ill let you no the outcome

- (#14449) ian, 8 Dec 04 08:56

Guess what just happened to us? The "pulley drop off syndrome!" On the upward bound Snake Pass just before the summit!!When the power steering and the servo braking fails handling becomes interesting, then add some Peak district very wet weather on a new years day and adrenalin is BROWN.
The long and the short is I don't think the key way is overly damaged but the pulley is gone it jumped ship with the bolt and washer.Has anyone got one?
Mine seems to have 4 belts??

- (#14449) fossie, 6 Jan 05 21:04