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The mkiv Supra Owners Club

Aux belt seems to be sitting 2mm over the tensioner wheel?


Lude

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right so ive just re-firbished my PAS pump,

 

and put on my aux belt.

 

i start the car up, after being on idle for a few mins and turn off,

 

the belt looks asif its coming over the tensioner pulley?

 

its overhangin about 1or2mm.

 

 

ive taken it back off, and put back on, so its seated nicely, not overhanging. start the car back up for few seconds then checked it, and its moved off again?

 

 

is it suppsted to do this? im sure it used to run like this before and never fell off completly,

 

 

i havent touched the water pump, crank damper, alternator, and have put the PAS pump back on propper, so theres no reason why anything else would be "nocking it out of line"

 

 

 

note i have not driven the car harsh, which would result it jumping off the pulley.

 

 

also i dont run this part as i have removed the air con

image

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Check your harmonic damper crank pulley with the tippex test. When mine went, the first thing I noticed was the belt sitting about 2mm over the edge of the idler pulley. I was caused by the outer ring of the crank pulley attempting to escape!

 

Edit: I've just seen one of your other postings saying you've got a squeak in that area also. That was the second symptom that I had when my pulley failed.

Edited by Andy Blyth (see edit history)
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thanks andy, i will do a tipex test on satuarday to confirm it.

 

its the squeek thats doing my head in. wondered if it was the PAS bearing, the aux belt, or the tensioner doing the squeek.

 

i would imagine its going to be the crank damper. seen a few posts on here they tend to fail, so i will get an OEM one.

 

on a scale of 1to10 how difficult isit to remove it? special tool required? or just a huge breaker bar?

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IF you've got the right tools (harmonic damper removal tool, big breaker bar, tool to lock the crank, BIG torque wrench, shredded wheat for breakfast) it'a about a "2." Using anything other than the right tools I could see it quickly becoming a "10."

 

Taking the radiator out makes the job much easier.

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hmmm, undertray is off with all air con etc removed so theres plenty of room under there..

 

 

iv got a large breaker bar, and some shreaded wheat here ;)

 

what tool do you need to lock the crank? do garages keep damper removal tools and this crank lock tool there? or do i have to locate 1st?

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long shot.... when i brought my 2nd TT it had a belt squeek which i found out to be the power steering pump pulley.

 

the nut had worked loose and the pulley started drifting off the pump splines causing the belt to not sit straight and become noisy

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iv got a large breaker bar, and some shreaded wheat here ;)

 

what tool do you need to lock the crank? do garages keep damper removal tools and this crank lock tool there? or do i have to locate 1st?

 

As you have a manual you can try putting it in gear and have someone sit in and hold the brake pedal and then try with the breaker bar.....very unlikely to undo it without an extension over the top of the bar (scaffold tube etc). This way is not the 'proper' way just like the breaker bar and starter motor method isn't but it usually gets the nut loose.

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long shot.... when i brought my 2nd TT it had a belt squeek which i found out to be the power steering pump pulley.

 

the nut had worked loose and the pulley started drifting off the pump splines causing the belt to not sit straight and become noisy

 

Thanks for that. Ive jusr had the pump off and checked the pas pulley which is ok

 

guna do tippex test satuarday and will post up then...

 

Thanks

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Don't tell me you just removed the air con pump and put a short belt on, please.... If you have you may be in for a real bad shock, fingers crossed for you...... Search my user name and air con removal and broken / cracked engine block. I don't have time to go through it all again. You CANNOT, CANNOT, CANNOT just remove the air con pump...

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Don't tell me you just removed the air con pump and put a short belt on, please.... If you have you may be in for a real bad shock, fingers crossed for you...... Search my user name and air con removal and broken / cracked engine block. I don't have time to go through it all again. You CANNOT, CANNOT, CANNOT just remove the air con pump...

 

Uh oh that doesn't sound good!!

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Don't tell me you just removed the air con pump and put a short belt on, please.... If you have you may be in for a real bad shock, fingers crossed for you...... Search my user name and air con removal and broken / cracked engine block. I don't have time to go through it all again. You CANNOT, CANNOT, CANNOT just remove the air con pump...

 

ive got a brace on there calm down :D

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Are you sure the PAS pump isn't now cocked over? Put a straight edge on the PAS pulley face and see it isabsolutely spot on in line with the other pulleys. If it's even out a fraction it will make the belt walk on the other pulley(s). Put the AC pump back on and see if the problem goes away, if it does your brace is, err, not very good :)

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Are you sure the PAS pump isn't now cocked over? Put a straight edge on the PAS pulley face and see it isabsolutely spot on in line with the other pulleys. If it's even out a fraction it will make the belt walk on the other pulley(s). Put the AC pump back on and see if the problem goes away, if it does your brace is, err, not very good :)

 

hmm i suppose it could be a factor...

 

however the PAS pump can only go on or off, it cant really go half on? (unless you dont have the bolts done up correctly)

 

i think its best if i do the tipex test first, then look at a new brace,

 

will post up tomorrow, thanks :)

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update,

 

been up my garage today, did the tipex test.

 

 

it failed. only had the car on idle for a few seconds, and revved it. (didnt take it for drive)

 

 

put the aux belt back on the tensioner wheel, and after a few seconds it goes back off.

 

 

do i defo 100% need a new one? or could it be that the PAS pump being out of line causing the damper to split.

 

 

 

PS man those dampers are expensive lol

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