Alternator belt

Alternator, waterpump, A/C, sensors, CAS, etc.

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Re: Alternator belt

Postby Fredjohn » Sun 09.02.2020, 17:31

FYI and apologies if you knew already, but the last 3 digits of the part no. are the length in mm.
If the new and old alternator pulleys are the same diameter, then the belt length should be the same. So your string measurement should be 690mm.
Hopefully they have supplied the wrong length.
Also look at posts above yours which suggest 685mm will fit.
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Re: Alternator belt

Postby dapinky » Sun 09.02.2020, 18:35

I have also used ones with imperial measurements ('cos they came from USA, where metric isn't the 'standard').....

....either ending 270 or 274 - which corresponds to 27.0 inch or 27.4 inch.......

(yes, I KNOW that they are mixing metric and imperial by having .4 of an inch, but hey ho, that's how it works!)
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Re: Alternator belt

Postby muley » Sun 09.02.2020, 19:51

dapinky wrote:I have also used ones with imperial measurements ('cos they came from USA, where metric isn't the 'standard').....

....either ending 270 or 274 - which corresponds to 27.0 inch or 27.4 inch.......

(yes, I KNOW that they are mixing metric and imperial by having .4 of an inch, but hey ho, that's how it works!)


27.4 inches =
695.96 millimetres

Which implies Geoff's solution will be close enough.

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Re: Alternator belt

Postby Tanz » Tue 11.02.2020, 21:33

Thanks for all the replies. SJ's reckon they sent the right belt but have said they will send me a 690mm if I send the 675 back so I have posted it.
Putting string around the pulleys with the alternator in the slackest position I.e. against the engine, and the measurement came out at 690mm. So the 690mm should just fit. Can't see anything in the service notes that refers to the belt size.
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Re: Alternator belt

Postby GeoffSmith » Tue 11.02.2020, 22:31

There's quite a bit in the Wiki Phil.
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Re: Alternator belt

Postby Tanz » Fri 14.02.2020, 17:54

Thanks Geoff.
SJ's sent me the 690 belt but still too tight. Almost goes on but if I did force it on, it would be way too tight, and the alternator would be held against the engine. Have now ordered a 700mm belt.
Is the pulley on the SJ replacement alternator the same diameter as the original alternator? I only ask as it has an extra rib which isn't a problem but obviously not the same as the original. I don't have an old alternator to compare.
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Re: Alternator belt

Postby Rambo » Sat 15.02.2020, 10:10

I'm fairly sure that people who purchase the SJS replacement alternator end up putting on the original pulley wheel from their OEM alternator. This would infer that the pulley wheels are different sizes ?

Correct me if I'm wrong somebody
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Re: Alternator belt

Postby Tanz » Sat 15.02.2020, 21:54

Rambo wrote:I'm fairly sure that people who purchase the SJS replacement alternator end up putting on the original pulley wheel from their OEM alternator. This would infer that the pulley wheels are different sizes ?

Correct me if I'm wrong somebody


I think they change them because the SJ's alternator has an extra rib on the pulley. Should be 4 rib as the belt number suggests 4PK700. However the extra rib is not a problem.
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Re: Alternator belt

Postby GeoffSmith » Thu 26.03.2020, 23:14

GeoffSmith wrote:
muley wrote:Thinking of trying a 4PK706.

I didn't listen to Pinky either but wasn't as radical as you so I've grabbed a 4PK698 on FleaBay as it's common and used on Citroën BX & ZX, Fiat Bravo & Doplo & Punto & Siena & Strada, Lancia Y, Misubishi Eclipse & Galant, Nissan Bluebird, Peugeot 205 & 309 & 405 and Talbot Horizon. It might be a complete waste of £3.95, but I can just about live with the potential loss.

PS 6PK948 seems to be a lot more common in the UK than 6PK945 (for the PAS belt).


I can confirm that the two very common (in the UK) belts that I used fit perfectly:

4PK698 put my alternator adjustment bolt right where I wanted it.

6PK948 is good for the no A/C PAS belt.

I'll update the Wiki.
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