Alternator Pulley Fell Off Topic is solved

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XC70Rider
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Alternator Pulley Fell Off

Post by XC70Rider »

On the way to work the alternator pulley fell off
I feel no damage to the clutch bearings and no damage to the pulley threads. Can I just turn the pulley back on alternator, throw on new belt and drive safe for a few days? I ordered a replacement kit from FCPEURO 30667878 that I'll get in 2 days.

Being towed home while writing this thread. :x

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Last edited by XC70Rider on Sat Oct 31, 2020 9:41 pm, edited 2 times in total.

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RickHaleParker
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Post by RickHaleParker »

You have the right tools to tighten it?
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

XC70Rider
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Post by XC70Rider »

The kit I ordered comes with the thread w splines and the 10mm stud. Tonight I just hand tightened the pulley while holding the clutch fins held in place.

I found no damage to the clutch nor pulley bearings and belt had no cracks. I threw the belt back on and drove for 5 miles tonight. No squalling while idling and all pulleys are in good shape.

The pulley threads back on CCW in same direction as the belt flows. Scratching my head on how it fell off in the first place? :?:

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RickHaleParker
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Post by RickHaleParker »

XC70Rider wrote: Tue Oct 27, 2020 7:27 pm Scratching my head on how it fell off in the first place? :?:
When the belt slows down, the inertia of the Alternator Rotor produces a relative CW spin between the shaft and pulley.
Indicates the pulley is not “free-wheel” or “overrunning” like it should.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

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darrylrobert
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Post by darrylrobert »

you can drive the car about 100km without an alternator, thats without using headlights/turn signal/radio/seat heater/avoid using brake light .
1981 260 GLE converted to 240 M46 after auto box failure
1987 740t auto converted to M47
1997 V70t5 auto converted to M56
1998 V70 factory M56 (parts car)
2001 XC70 factory M58
2002 XC70 auto (parts car)

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Post by XC70Rider »

With oe pulley and replaced belt thrown back on I drove 190 miles to and from work with no issues today.

At 146k miles the alternator might not last much longer so I ordered a new Boach from FCPEURO. I'll throw on the new alternator with a new belt and tensioner this weekend.

I'll rebuild the OEM alternator and keep it for backup. I'll search tor threads on what else to replace along with a new pulley and voltage regulator.

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Post by cn90 »

Agree with new alternator.

Pulley: life is about 140K-160K as you have learned.
Alternator lifespan is about 180K-200K (bearings, brushes etc.), the VR can fail any time between 100K-200K.

So a brand-new alternator is the way to go, less future headache.

I guess you can return the pulley (FCPEURO 30667878).
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

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Post by ljsommar1 »

The pulley on my alternator came off while I was about 90 miles from home. Almost unbelievably I was able to make it home. The serpentine belt still drove the alternator shaft. I did not even discharge the battery.
I ordered a new (not rebuilt) and have not had a problem since, about 30K miles. I rebuilt the original to have as a spare. It is worth noting most alternators sold are rebuilt units and most do not replace the bearings and if they do, they use cheap Chinese ones.

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Post by xHeart »

XC70Rider wrote: Tue Oct 27, 2020 3:08 pm On the way to work the alternator pulley fell off
Why would a pulley fell off? how old is the tensioner?
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ignatz
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Post by ignatz »

I also had a clutch pulley grenade on my past 2001 V70. I heard a noise in that area, but somehow I thought the power steering pump was making the noise. I was changing the power steering fluid and no improvement was made. Not too long after that, the clutch pulley gave loose.
I also remember that the shop put on a rebuilt alternator with a solid pulley. They probably figured that I don't go over 3 grand too much.
98 S70 T-5

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