24V cambelt tensioner pulley bearing question

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Giri
Posts: 15
Joined: Wed Sep 11, 2013 3:20 pm
Location: Comune di Punkalaidun

24V cambelt tensioner pulley bearing question

Post by Giri » Thu Jan 09, 2020 8:58 am

Hi all,

What have you all used as the cambelt tensioner pulley bearing when replacing the belt and associated parts? The supply of 60580235 oem pulleys has more or less dried out and the Dayco ATB2574, which I assume is of OEM quality, is very expensive. I have understood that the cheaper alternatives which are readily available, use a single row bearing while the OEM (and probably Dayco ATB2574 since it is so expensive) has a double row bearing.

I would not want to replace the existing one with an inferior part so am thinking about the alternatives. One possibility is to press out the center hub and use just a new bearing on the old hub. Obviously it would be best to use SKF 633254, which (again I assume) is the one used on the OEM part but I cannot find it anywhere anymore. I remember reading from somewhere that also two single race bearings can be pressed onto the old hub. Has anyone tried that and knows the part number of the bearing?
Daily driver:
Giulia JTDm 180 AT8
Projects:
1993 164 24V QV
1990 33 16V QV
1992 155 2.0TS 8V
ex Alfas:
159 2.4 JTDm Qtronic, 156 JTS Selespeed, 164 3.0, 33 1.5, Alfetta 1.8

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Alfan
Q4 owner
Posts: 1218
Joined: Thu Oct 22, 2009 8:20 pm
Location: Denmark
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Re: 24V cambelt tensioner pulley bearing question

Post by Alfan » Mon Jan 13, 2020 7:33 pm

I will soon start work on my Q4 and will be replacing cambelt and tensioner as well, so interested in this. If I find anything interesting, I will let you know, but so far I have found the same as you have.
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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killergame
Posts: 129
Joined: Sun Aug 17, 2014 9:29 pm
Location: Slovenia
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Re: 24V cambelt tensioner pulley bearing question

Post by killergame » Tue Jun 23, 2020 8:31 am

Bearings are all unavailable. I have checked all possible bearings manufacturers. Even SKF which made original, said no replacement.

But luckily I have found some italian manufacturer which makes NEW bearings with 24V middle part. So for 24V direct install, and for 12V you need to press out 24V middle part and then press in 12V middle part. Have done this already 5-6 times. Works great.

I have bearing available if anybody needs it. Shipping worldwide. Price for bearing is 75€.

Image

Image
Alfa 164 3.0 V6 12V "QV" Q2 1990
Alfa 156 SW 1.9 JTDm 2005

Alfa 156 SW 1.9 JTD 2000 - ex
Alfa 164 2.5 TD 1993&1998 - ex
Alfa 164 2.0 TS 1993 - ex
Alfa Giulietta 2.0 1974 - ex

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