ALTERNATOR !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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300tdi alternator confusion

Postby Interlet » Sat 28 Apr 2012 1:38 pm

Having made two attempts now at buying a new higher output alternator, I am now stumped. The first one I bought was 120 amp and I can understand why that didn't fit as there was never a 120 amp alternator for the 300tdi. To my knowledge, Discoveries with aircon have the 100 amp alternators, and as I've read on numerous times, it's a popular alternator upgrade - putting a Disco 300 100amp alt on a Defender that has more electrical extras.

My understanding was that this is literally a simple alternator swap and wiring upgrade. But, having bought a brand new Denso 100amp alternator from Paddocks that states it is for D1 300td Range Rover 300tdi AND Defender 300tdi, I am now pretty frustrated that once again, these brackets are too close together to offer up to the engine.

Can someone shed some more light on this, as I rang Paddocks up and they said no it's not a straight swap and that you can't simply stick a 100amp one where a 65 one used to go. The gap is approx 10mm too short to fit.

The gap between the brackets on this one is the same gap as the one between the 120amp which is what I was originally after, which makes it even more frustrating.
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Re: 300tdi alternator confusion

Postby Ralph » Sat 28 Apr 2012 1:45 pm

one of the brackets should have a split sliding bush in it, I have a marrelli 100amp alt from a 300tdi Discovery on my 200tdi defender spec engine, been on there for over 10 years.
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Re: 300tdi alternator confusion

Postby OG. » Sat 28 Apr 2012 4:06 pm

I replaced Fester's 65A with a Denso 100A internal fan version and went straight on with no modifications at all...
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Re: 300tdi alternator confusion

Postby Interlet » Sat 28 Apr 2012 4:25 pm

I'm aware that there are sliding roll pins to adjust the gap a bit, but the actual casting brackets are 10mm too narrow - that's what is confusing me!
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Re: 300tdi alternator confusion

Postby Interlet » Sat 28 Apr 2012 4:27 pm

OG. wrote:I replaced Fester's 65A with a Denso 100A internal fan version and went straight on with no modifications at all...


OK, OG, can you measure up the gap between the top brackets on your alt?

Right, just measured.

Original alternator - a 65A Magnetti Marelli unit with official LR logo on it - gap between brackets (ignoring roll pin) is 82 or 83mm

New one I just bought the gap again excluding roll pin is exactly 70mm. The roll pin can only reduce that obviously not increase the gap.

Interestingly enough, so was the 120amp one I bought, but that said for a V8 on. This new one said Defender 300tdi !
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Re: 300tdi alternator confusion

Postby Greg Tingey » Tue 01 May 2012 2:12 pm

I wonder if you've been mistakenly sold the wrong unit ??
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ALTERNATOR !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Postby Interlet » Thu 03 May 2012 8:51 pm

OK, really fed up with the bad luck and confusion about my alternator!!

Having googled the part number, the only LR related thing mentions 200tdi :S

Anyway, here is a photo of all the details on the old Alty

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As I've said before, the gap between the lugs on this one are from memory, over 80mm.

One I bought is a Denso MSY63341-35303E and it does not fit!!!!!!!!11

EDIT TO MODS ANY CHANCE OF MERGING THE TWO THREADS?! CHEERS!
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Re: 300tdi alternator confusion

Postby Interlet » Thu 03 May 2012 9:01 pm

Greg Tingey wrote:I wonder if you've been mistakenly sold the wrong unit ??


It's possible, but I rang up and what the grumpy woman at Paddocks said was that you cannot simply swap a 65amp one for a 100amp one as they are completely different, which is why mien doesn't fit. That is contradictory to what I've heard and read by just about everyone.

EDIT TO MODS ANY CHANCE OF MERGING THE TWO THREADS? CHEERS!!!!!!1
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Re: ALTERNATOR !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Postby Edlen » Thu 03 May 2012 10:01 pm

Britishparts.co.uk shows the following information
ALTERNATOR ( A127 - 65 ) AMP
DISCOVERY SERIES 1 V8 CARB / EFI
DEFENDER 2.25 PETROL AND V8 CARB
DEFENDER 2.5 - 200 TDI WITH A / C
RANGE ROVER CLASSIC V8 EFI
It also shows

ALTERNATOR WITH LH FIXING A127 65AMP
DISCOVERY SERIES ( 1 ) 200 TDI DIESEL
RANGE ROVER CLASSIC 200 TDI DIESEL
DEFENDER V8 W CARBS
So this alternator comes in left and right hand fitting.
A 100 amp version also comes in both left and right hand and the V8 has a different fitting. I know cause I have a brand new one sitting in a box in the garage from when I went to buy a second alternator for my defender 300tdi. I hope this helps a little.
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Re: 300tdi alternator confusion

Postby OG. » Fri 04 May 2012 12:27 am

Interlet wrote:
OG. wrote:I replaced Fester's 65A with a Denso 100A internal fan version and went straight on with no modifications at all...


OK, OG, can you measure up the gap between the top brackets on your alt?

Right, just measured.

Original alternator - a 65A Magnetti Marelli unit with official LR logo on it - gap between brackets (ignoring roll pin) is 82 or 83mm

New one I just bought the gap again excluding roll pin is exactly 70mm. The roll pin can only reduce that obviously not increase the gap.

Interestingly enough, so was the 120amp one I bought, but that said for a V8 on. This new one said Defender 300tdi !


Just measured mine. Its a shade over 80mm. Not much use to you though as there are no stickers or labels on the alternator.
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