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79porsche · Posted: Wed Apr 25, 2007 3:03 pm Post subject: Alternator belt wearing rapidly

I just put on new belts not long ago and my altenator belt is wearing. After looking at the alignment of the pulleys for the altenator belt....I noticed that the altenator is not sitting straight. What wears that would let the altenator's position shift?
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1979 Porsche 924 N/A

leadfoot · Posted: Wed Apr 25, 2007 4:19 pm Post subject:

upper bushings... and lower rubber mount breaks...
Leadfoot
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

If the lower rubber mount has gone, I'd advise replacing it with a home-made solid bracket. It'll make the adjusting the belt tension a whole lot easier.

If your upper bushes are rubber, replace then with ppoly bushes. I believe Ozzie found some Nissan poly suspension parts that are a good fit!
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Opps!

My mistake: it was Toyota Land Cruiser
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Leadfoot forgot to mention his economic alternative:

das push · Joined: 27 Oct 2005 Posts: 53 Location: cincy, oh, usa

Check to make sure the top front mount is on in the proper direction. If you have replaced the water pump, that bracket had to be removed. If put on backwards it will move the pulley about an 1/8 to a 1/4 of an inch out of alignmet.

Ask me how I know? After 2 belts in about 5k miles I realized my mistake. Whoops.
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1982 924 NA 85K owned since 1992
82 nicknamed das push"the push"by my kids.
lots of electrical problems 1st yr of owner ship!

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

79porsche · Posted: Fri May 04, 2007 4:04 am Post subject:

The souce of the problem is that there's two rubber covered mounts that hold the top of the alternator and the front mount rubber is completely missing. The mount on the bottom of the alternator consists of a large rubber chunk and it looks ok but it's not very firm...but it's not broken.

I don't see how the upper mounts can be fabricated.....they have a metal core that's the size of the bolt...which is covered in rubber...and the outside of the rubber slips into the metal bracket. The lower mount seems like it could be fabricated. I guess I need to try to find some factory replacement mounts for the top.
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1979 Porsche 924 N/A

Ozzie · Posted: Fri May 04, 2007 7:29 am Post subject:

The urethane mounts I got have a steel inner spacer tube.
Get 4 in a pack- you only need three. $26Au.
Steeny has the part no- I sent him the packet with 2 in it.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

79porsche · Posted: Tue May 08, 2007 3:02 am Post subject: A/C compresser rubber mount

Seems that my A/C compressor is also not lined-up correctly....and the rubber in the mount might be the problem. Where do I find the rubber bushing that goes in the a/c mount? All the rubber is dead on this car after 28 years.
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1979 Porsche 924 N/A

79porsche · Posted: Tue May 08, 2007 3:08 am Post subject: A/C compresser rubber mount

Seems that my A/C compressor is also not lined-up correctly....and the rubber in the mount might be the problem. Where do I find the rubber bushing that goes in the a/c mount? All the rubber is dead on this car after 28 years.
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1979 Porsche 924 N/A

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Having both the RHD and LHD alternator mounting brackets to compare, I notice that the rubber bushes are different between the US and OZ.
The RHD front bush is cylindrical and sits in a tube section whereas the USA one is a grommet shape. They both have an internal metal sleve.
It is likely that the RHD alternatives wont be a good fit on LHD. This is probably one instance where the genuine part is most cost effective.

Incidently, there is a 4mm spacer behind the waterpump pulley on both versions. LHD has the pulley moumted so that the belt runs behind the pump flange while RHD flips the pulley forward.

Roger

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Having both the RHD and LHD alternator mounting brackets to compare, I notice that the rubber bushes are different between the US and OZ.
The RHD front bush is cylindrical and sits in a tube section whereas the USA one is a grommet shape. They both have an internal metal sleve.
It is likely that the RHD alternatives wont be a good fit on LHD. This is probably one instance where the genuine part is most cost effective.

Incidently, there is a 4mm spacer behind the waterpump pulley on both versions. LHD has the pulley moumted so that the belt runs behind the pump flange while RHD flips the pulley forward.

Roger

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Having both the RHD and LHD alternator mounting brackets to compare, I notice that the rubber bushes are different between the US and OZ.
The RHD front bush is cylindrical and sits in a tube section whereas the USA one is a grommet shape. They both have an internal metal sleve.
It is likely that the RHD alternatives wont be a good fit on LHD. This is probably one instance where the genuine part is most cost effective.

Incidently, there is a 4mm spacer behind the waterpump pulley on both versions. LHD has the pulley moumted so that the belt runs behind the pump flange while RHD flips the pulley forward.

Roger

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Having both the RHD and LHD alternator mounting brackets to compare, I notice that the rubber bushes are different between the US and OZ.
The RHD front bush is cylindrical and sits in a tube section whereas the USA one is a grommet shape. They both have an internal metal sleve.
It is likely that the RHD alternatives wont be a good fit on LHD. This is probably one instance where the genuine part is most cost effective.

Incidently, there is a 4mm spacer behind the waterpump pulley on both versions. LHD has the pulley moumted so that the belt runs behind the pump flange while RHD flips the pulley forward.

Roger