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Thread: Alternators: Clutch vs Fixed Pulley

  1. #1
    Not a Mod ZENNON's Avatar
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    Alternators: Clutch vs Fixed Pulley

    Hi gents,

    What are the pros/cons of clutch vs fixed pulley alternators?
    (one in the GU is on the way out)

    E.g.
    http://patrolapart.com.au/product/ni...amp-alternator
    http://patrolapart.com.au/product/ni...h-fixed-pulley

    Cheers
    '03 GU PATROL
    '92 R32 GTST
    '86 4WD HILUX

  2. #2
    25 schmeckles? Do the safety dance.'s Avatar
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    I always put fixed pulleys in when replacing alternators. Way cheaper, one less thing to fail.

  3. #3
    Not a Mod ZENNON's Avatar
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    Yeah that's the way I was leaning as well actually but don't really understand the difference. Fixed pulley means the alternator will always be working when the engine is running. Does the clutch ones sometimes not run then? (surely not) Or is it just to make it "smoother" (for when it starts/stops)?

    #alternatorNoob
    Last edited by ZENNON; 11-04-17 at 09:19 AM.
    '03 GU PATROL
    '92 R32 GTST
    '86 4WD HILUX

  4. #4
    Goat roper Motherfucker Jones's Avatar
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    It's just a one way clutch. On a shitty diesel at idle they're so jerky that the belt motion practically starts and stops and this results in belt squeak from the belt slipping on the alt pulley. It's become more of a thing with modern high amp/high load alternators. The clutch essentially allows the alternator to keep spinning when the belt 'stops' for that short period of time. It's probably a little nicer for the insides of the alternator too.

    Downside is that they're shit and they fall off all the time, which can really fuck your day.
    Quote Originally Posted by RVK 355 View Post
    Hold it flat cunt

  5. #5
    Not a Mod ZENNON's Avatar
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    Quote Originally Posted by Motherfucker Jones View Post
    It's just a one way clutch. On a shitty diesel at idle they're so jerky that the belt motion practically starts and stops and this results in belt squeak from the belt slipping on the alt pulley. It's become more of a thing with modern high amp/high load alternators. The clutch essentially allows the alternator to keep spinning when the belt 'stops' for that short period of time. It's probably a little nicer for the insides of the alternator too.
    Cheers - makes sense.

    Quote Originally Posted by Motherfucker Jones View Post
    Downside is that they're shit and they fall off all the time, which can really fuck your day.
    The clutch ones?

    Might be biased but my engine is actually not that shitty and jerky so should be ok
    I'll just go with the fixed pulley on my powerful 4cyl 2953cc powerplant
    Last edited by ZENNON; 11-04-17 at 09:56 AM.
    '03 GU PATROL
    '92 R32 GTST
    '86 4WD HILUX

  6. #6
    Goat roper Motherfucker Jones's Avatar
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    Yeah the clutches fail and pulley makes an exit. Have seen quite a few D40s do it. Occasionally you see a lucky one where the belt lands back on the alternator shaft and they keep driving lol. If they don't fall off they just lock up and customer complains of belt squeal or they just lose drive altogether and charge erratically
    Quote Originally Posted by RVK 355 View Post
    Hold it flat cunt

  7. #7
    Chopped BigMuz's Avatar
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    I had it explained that it's also about how quickly these high comp engines stop, they tend to undo the nut if they don't have a sprag.
    Retard Honour Wall.
    Quote Originally Posted by Sloth View Post
    Rob Sloth Young did i ask for your opinion? no. i only want it for a paddock bomb. go play with traffic.
    Quote Originally Posted by Fondles View Post
    you stupid fucken imbicle.
    Quote Originally Posted by Fondles
    your are a fucken idiot of the highest level.

  8. #8
    Not a Mod ZENNON's Avatar
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    hmmm
    '03 GU PATROL
    '92 R32 GTST
    '86 4WD HILUX

  9. #9
    Chopped BigMuz's Avatar
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    What? They bounce backwards against a cylinders compression when they stop.
    Retard Honour Wall.
    Quote Originally Posted by Sloth View Post
    Rob Sloth Young did i ask for your opinion? no. i only want it for a paddock bomb. go play with traffic.
    Quote Originally Posted by Fondles View Post
    you stupid fucken imbicle.
    Quote Originally Posted by Fondles
    your are a fucken idiot of the highest level.

  10. #10
    Registered User dnegative's Avatar
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    I don't think its that;
    More about belt life and NVH
    Quote Originally Posted by cracka View Post
    Fuck I'm retarded

  11. #11
    Convicted User data_mine's Avatar
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    I run clutch pulleys on the alt on my GT, the solid pulleys squeal and shit on gear changes.

    Never had one disintegrate on me, the ones I've seen fail just fail to engage the alt - they free spin, no charge.
    GT-P
    Bandsenkowagon

  12. #12
    Not a Mod ZENNON's Avatar
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    Old one came out easy at least
    Click image for larger version. 

Name:	Old GU3 ZD30 Alternator.jpg 
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    '03 GU PATROL
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    '86 4WD HILUX

  13. #13
    xxxx BoboTheMonkey's Avatar
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    of the 5 Nissan D40s we have at work, three have lost their alt pulley. All around 120k.

  14. #14
    Brown Cunt MR-PUNANNY's Avatar
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    Slightly off topic lads, but what about enclosed watercooled alternators?

    Couple of the petrol guys had issues yesterday after some deep muddy holes with their alternator dying on them.
    Quote Originally Posted by The Property Guru
    don't haemophrodites generally have tiny wangs?
    Quote Originally Posted by oxy View Post
    No, that's asians
    A80 Supra
    80 Landcruiser

  15. #15
    Gas Turbine enthusiast da9jeff's Avatar
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    Usually mud gets in and destroys the brushes. A normal alternator is water proof, just not mud proof. Look up bmw water cooled alternator. Pretty cheap on eBay.

    Sent from my SM-G930F using Tapatalk
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  16. #16
    Brown Cunt MR-PUNANNY's Avatar
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    Yeah, would have been mud, but the BMW ones wont fit a LC right?

    There is a place charging 2k for water cooled ones for Landcruiser
    Quote Originally Posted by The Property Guru
    don't haemophrodites generally have tiny wangs?
    Quote Originally Posted by oxy View Post
    No, that's asians
    A80 Supra
    80 Landcruiser

  17. #17
    Registered User TRD-MX62's Avatar
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    yeah the "cheap" bmw watercooled alternators require you make a water jacket for them hence the $2k price tag for aftermarket ones...


  18. #18
    Brown Cunt MR-PUNANNY's Avatar
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    yeah, the 100 series had the problem yesterday, died on the way hom on the freeway, due to alternator. so he is looking at getting that
    Quote Originally Posted by The Property Guru
    don't haemophrodites generally have tiny wangs?
    Quote Originally Posted by oxy View Post
    No, that's asians
    A80 Supra
    80 Landcruiser

  19. #19
    Gas Turbine enthusiast da9jeff's Avatar
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    Washing with water straight after mud also helps

    Sent from my SM-G930F using Tapatalk
    Tow car/camping bus: 2011 D40 Navara ST

    Baby mobile: 2016 Nissan Qashqai

    75 Mini Clubman club racer - DCOE powah

  20. #20
    Desert Nigga vet 180's Avatar
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    Quote Originally Posted by da9jeff View Post
    Washing with water straight after mud also helps

    Sent from my SM-G930F using Tapatalk
    This.

    I haven't had an alternator let go from mud yet, but I normally hose it down after
    Quote Originally Posted by Babalouie View Post
    Geez we're a bunch of softcocks...we have a 911 and we're obsessing over non-functional ducts and indicator colours

  21. #21
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    The camry V6 alternators just get noisy I forgot I did one a year before and chased a noise on one and realised it was the fucken gay clutch alt. Just had a golf at work that threw the pulley lucky it caught the belt lol.
    Quote Originally Posted by Lord_fahrquhar View Post
    The au put the fucking tunnel in with the bullbar. Even Chuck Norris respects the ability of the au coon.

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