magneti marelli 100 amp alt

[Disco_owner]

Does anyone here know if a Bosch replacement exists inplace of the Original magneti marelli on the 300tdi Disco ? if so does anyone recommend the Bosch replacement unit ?

[amshaw]

Does anyone here know if a Bosch replacement exists inplace of the Original magneti marelli on the 300tdi Disco ? if so does anyone recommend the Bosch replacement unit ?

We bought a magneti marelli 2 yrs ago from our local auto pro (Hunts) and from memory it was around the $320 mark.....same as gen LR without the LR sticker.....best bet is to take the unit with you to any good spare parts place and if there any good they should be able to help you out.......;)

[Disco_owner]

Hi Andrew;

Thanks for reply , John next door neighbour pulled apart the original MM and found the Bushes were worn out, so I thought whilst I have the MM Alternator out , I'd Like to replace it with higher Ampere Bosch unit , is this recommended ? will I be better off getting the existing one reconditioned thru a Auto Electrician ?
The Problem with these Unit is the desoldering and resoldering all the Wires ? would this be the case with the Bisch unit ? I have been told to stay away from the Lucas Alternators , does anyone have any thoughts on this ?

[ozscott]

Mate the Marnelli 100 amp is a nice unit. When I replaced mine at 230,000k it was the original alternator. I went to Ashdowns and bought the exact same one without the LR badge for $320 inc GST (only 4 months ago) - still made in Italy and looks identical. They last well I reckon. I tried reconditioning the original unit and it failed twice in quick succession, so Im not a fan of that.

Cheers

[slug_burner]

This (http://members.optusnet.com.au/mac.man/alternator_swap/) was posted from a link on this forum and it covers the change from MM to Bosch

[GeorgeZ]

I have done the same as the link above and installed a Bosch unit in my 93 RR. But recently I have been thinking, I did as noted and soldered a lead out of one phase for the tacho but couldn't I have just as easily linked the negative terminal from the coil to the tacho? I am now wondering why not? Its the standard way to get a pulse to the tacho. Can anyone enlighten me, why or why not?

George

[lokka]

I have done the same as the link above and installed a Bosch unit in my 93 RR. But recently I have been thinking, I did as noted and soldered a lead out of one phase for the tacho but couldn't I have just as easily linked the negative terminal from the coil to the tacho? I am now wondering why not? Its the standard way to get a pulse to the tacho. Can anyone enlighten me, why or why not?

George

Well if its a petrol motor with an ignition coil its the normal way to get the siginal tho the tacho may not accept the signal ;););)

[loanrangie]

This (http://members.optusnet.com.au/mac.man/alternator_swap/) was posted from a link on this forum and it covers the change from MM to Bosch

This is for a V8, no good for a TDI.

[langy]

This topic has been asked before - on the old forum I did a thread on what was inside a MM 100A 127i alternator in a 300Tdi, and how hard it was to source parts for it. I rebuilt the old one myself as a spare, and bought the generic MM (as described by the others) from Coopers at Tempe. The problem lies in that the 300TDI mounting needs an alternator cranked to the left. If you look at a V6 commodore alternator, you'll see that the two arms are in a straight line. Most other alternators have the adjustment arm cranked to the right. That's what prevents using a Bosch unit in a 300 TDi. On the positive side, you can get generic MM 127i alternators in 120amp at certain specialist electrical outlets - there was a listing for a place at Silverwater, but the only one I could find today was this (Look at the VG088)

http://www.pjldiesel.com.au/PDF/New_products/NewsJuly07-web.pdf

[rick130]

I'll post up the critical dimensions for a Tdi alt and the alternatives tonight.
Basically the only alternative in Oz is a Transit diesel one and IIRC a Mondeo one, so you may as well get an original type one as they are the same price.
Nothing Bosch, Hitachi or anyone else makes are remotely the same mountings.
BTW, most catalogues list them as a Lucas.

They are becoming more available through the wholesalers as the fella's above have outlined.

[rick130]

OK, OEX list the Tdi 100 amp alternator as an MXA 831.

Critical dimensions are:

Left hand mount
Pivot lug hole diam. 8.2mm
Adj. hole to pivot hole. 148mm
Length foot to foot. 80mm
Pulley diam. 53mm, 7 grooves.

Funny thing is that the Defender dimensions are listed as slightly different, but are in fact identical.

[slug_burner]

I have seen threads around on this and other forums that use the alt out of a Magna or V6 verada?? for the TDi alt replacement.

[loanrangie]

I have seen threads around on this and other forums that use the alt out of a Magna or V6 verada?? for the TDi alt replacement.

As in the link you posted ? only fit a V8, nothing fits a tdi.

[rick130]

I have seen threads around on this and other forums that use the alt out of a Magna or V6 verada?? for the TDi alt replacement.

been through the Bosch catalogue with an Auto Leccy and nothing matches the mounting dimensions I've posted above.

[Disco_owner]

Bushes were not as bad as we thought ,they had a few more 1000 k's left on em, so my mate John replaced the bearing inside ( whilst he had it pulled apart ) and I reinstalled original MM alt back on the car.

I'm still going to further investigate the option of placing a Generic 120A alt.

thanks of your replies

[tab]

I replaced my MM with frozen bearings, with a new Lucas atlernator, I thought it looked well made, external regulator on endplate, and servicable, ...time will tell I guess. I seems every time I drive on the sand at the beach another bearing dies.

[HAK]

Bushes were not as bad as we thought ,they had a few more 1000 k's left on em, so my mate John replaced the bearing inside ( whilst he had it pulled apart ) and I reinstalled original MM alt back on the car.

I'm still going to further investigate the option of placing a Generic 120A alt.

thanks of your replies

why don't you get it rebuilt and rewound I remember in the old duff duff days we use to get our alternators rewound to make up the power loss for the amount of amplifiers we ran some times up to 6

[Disco_owner]

why don't you get it rebuilt and rewound I remember in the old duff duff days we use to get our alternators rewound to make up the power loss for the amount of amplifiers we ran some times up to 6

ROVERNT I did notice you had a bit of a hearing problem when you came over my house before Xmas , were you not able to hear 200+ decibels of Choof Choof music ? having 6 Amps ? :D:D:D:D hehe just kidding Wow. Hey you may be able to give me a hand install 4 channel Amp somewhere inside the D1 and I'll help you in return with you rear Shelf / Storage unit.

[HAK]

Dont laugh I had the second loudest car in the 1998 Summernats 1000 watts RMS plus class only beaten by 2 DB by the strathfeild radio bedford who had 12 18" rockford subs I cracked a front windscreen from the base :D:D:D yes Im a little def I came in at 186DB 4 cerwinvager 12" stroker Subs rates at 1000RMS 4 7" 2 midbase 2 mid range and tweeters in the rear door Pannels had 6 7" 3 midrange 3 Midbase 2 tweeters each door 2 5 1/4" centre channels 4 amps base amp was rated 800w 4 ohm I ran it at 1/4 ohm stable at 1/4 due to dual car subs :-)

[Disco_owner]

Mate , what do you reckon ?

1 x 8" or 10" Sub in the read parcel shelf ,1 x 4 channel Amp to drive the Sub and 2 x 6" speakers under the seats . plus 6 really good quality 4" speakers which I have already installed . will that sound descent ? I don't want loudness , I 'm after clarity with a little bit of base.