Torque settings for Aux Belt Tensioner and idler - Alfa Romeo Forum
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Old 06-04-10
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Torque settings for Aux Belt Tensioner and idler

Had intended doing all my belts over the Easter period, but! as usual my ex has decided that she would mess with my plans.

Anyways, Granny has been very good and taken care of my daughter for the day and i have decided that i will do the Aux belt and its Tensioner and idler on the 2.0TS. Sy has offered his help but! i have literally been given a window to do the work in the last hour and i believe that its a relatively easy task on the 2.0TS engines.

Have researched but noone ever mentions if they use thread lock on the replacement Tensioner or Idler nor what the torque is of these component bolts! Am i worrying about nothing?

Thanks in advance as always.

ER.
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Old 06-04-10
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Just got in after doing a rear wheel bearing, hand-brake cables and re-seating the join on the back box on my daughter's 147. Had a look in my manuals and cannot find any reference to the aux. belt tensioner and idler bolt torques. Not much help I suppose, but I just use an ordinary length spanner and nip them up. I use medium lock-tite on the threads.
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Old 06-04-10
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Many Thanks armoore.
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Old 06-04-10
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Manual quotes: Auxilliary units drive belt pulley securing screws 24+29 nm, 2.4+3.0 kgm.

Doesn't differentiate between tensioner and idlers, but quotes 'screws' plural so assume all the same.
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Old 06-04-10
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Thats great Watshot! which manual are you using if you don't mind me asking?
So! is Loctite 243 good enough for the bolts?

Thanks fellas, i really would be up a creek without this site.
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Old 06-04-10
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The original Alfa workshop manual, it was made available to us as a download some years ago.

I don't think it's likely that the factory used thread locking compounds on these bolts, so anything you want to use would be ok, just depends how difficult you want removal to be next time!
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In the hard copy manuals that I have that torque setting is for the drive pulley bolts and not the tensioner/idler bolts. However, that torque range covers many of the bolts/nuts all over the car so I would not be surprised that it will be in the approximate region for the tensioner/idler too.


243 is medium strength so will be fine. I tend to use thread lock a fair amount where oiled threads are not specified. Either that or copper grease if I know I'll have to take the part off from time to time, for instance the screws on top of the air box. Just be careful using thread lock near plastics as some are affected by it. There is a thread lock for plastics but not commonly used.

Last edited by armoore; 06-04-10 at 14:36.
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Old 06-04-10
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Cheers fellas! Just got into my work gear and will do the job now! report back later.
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Originally Posted by EauRouge View Post
Cheers fellas! Just got into my work gear and will do the job now! report back later.
I'm now aching having grovelled under the 147!
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Originally Posted by armoore View Post
I'm now aching having grovelled under the 147!
I've got the covers off and decided its time for a tea break!
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Well, I decided to change the upper front wishbone and the drop link on the driver's side, seeing as I had the parts (did the near-side last year). So just got in from that, now I know I'm going to ache!
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Old 06-04-10
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I don't normally use a torque wrench on auxillary belt tensioners.

Just do them up tight and use some loctite (I used 603 which is Medium-High strength, oil tolerant)

Just bear in mind that the screws go into aluminium so don't go too mad when you tighten them.
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Hi Sy, its a bit too dark now, got the old idler and tensioner of and the new ones on, but im flummoxed at how to get the new belt on, have loosened both bolts on the tensioner and tried turning the black wheel anti-clockwise but i reckon i need a feed of spinach as im damned if i can get it anywhere near to slipping the new belt on. I guess i will try again tomorrow AM.
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Originally Posted by EauRouge View Post
Hi Sy, its a bit too dark now, got the old idler and tensioner of and the new ones on, but im flummoxed at how to get the new belt on, have loosened both bolts on the tensioner and tried turning the black wheel anti-clockwise but i reckon i need a feed of spinach as im damned if i can get it anywhere near to slipping the new belt on. I guess i will try again tomorrow AM.
Tighten the bolts up on the tensioners tight before you start, then get a 15mm spanner on the top bolt of the adjustable tensioner to lever it anti clockwise.

It is pretty heavily sprung and you need to have had your weetabix, but you should be able to put the belt over all of the other pulleys, then put the spanner underneath the belt and lever over the tensioner enough to pop the belt over.

I have use a combination spanner in the past and levered the tensioner over, then used a long screwdriver through the ring end to wedge against the brake caliper whilst putting the belt on. Make sure the screwdriver is wedged solid otherwise if it slips it will hurt your fingers.

Smaky uses a length of cord or rope through the ring of the spanner then lifts the spanner up from the engine compartment whilst putting the belt on.

Both methods should work.
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Old 06-04-10
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Thanks Sy! the silly thing is that i will have to do the whole thing again in the short term as i need to change the cam & balance belt as you know. Im just scared of the Aux giving up the ghost as i have had a horrible grinding from the idler bearing. So! i will have another go tomorrow AM after i've had my weetabix.
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