MudAllOverIt Posted November 22, 2008 Share Posted November 22, 2008 I've just bought a 100A AMR5425 Magneti Mirelli (Denso) alternator to replace the factory-fitted 65A AMR4249 Magneti Mirelli on our 300Tdi D90. The original 65 A alternator used a heatshield with a three-stud fixing whereas the reaplacement uses a 4-stud fixing for the heatshield. Does anyone know what he LR part numbers are for (1) the 4-stud heat shield and (2) the mounting pillars for the AMR5425 alternator? The 100A alternator is about an inch or so deeper than the 65A one so it's back cover will be closer to the manifold and don't want to risk it without the heat shield. Cheers, Quote Link to comment Share on other sites More sharing options...
western Posted November 22, 2008 Share Posted November 22, 2008 Don't bother with it, my 200Tdi has the same alternator fitted without the heatshield & it's never caused me or the 110 any problems. Quote Link to comment Share on other sites More sharing options...
MudAllOverIt Posted November 22, 2008 Author Share Posted November 22, 2008 Don't bother with it, my 200Tdi has the same alternator fitted without the heatshield & it's never caused me or the 110 any problems. Good to know. Was a bit concerned that on the 300Tdi the back of the alternator will end up about two/three inches from the downpipe. But looking at it the wire I ran to the W terminal on the old alternator hasn't come to any harm so far. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted November 23, 2008 Share Posted November 23, 2008 Ralph, your turbo is a lot further away on the 200 defender engine. The heat shield is be important on a 300 due to the altenator's proximity to the turbo. Mo Quote Link to comment Share on other sites More sharing options...
white90 Posted November 23, 2008 Share Posted November 23, 2008 I cable tied the Defender on onto the cables with some insulation to the Disco one I fitted. Quote Link to comment Share on other sites More sharing options...
western Posted November 23, 2008 Share Posted November 23, 2008 Ralph, your turbo is a lot further away on the 200 defender engine. The heat shield is be important on a 300 due to the altenator's proximity to the turbo.Mo Yeah, I know it's different. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted November 23, 2008 Share Posted November 23, 2008 Sorry Ralph, I disagree quite strongly and I think you've given some poor advice there. Mo Quote Link to comment Share on other sites More sharing options...
western Posted November 23, 2008 Share Posted November 23, 2008 oh well, if it's needed then fit the heatshield. Quote Link to comment Share on other sites More sharing options...
MudAllOverIt Posted November 23, 2008 Author Share Posted November 23, 2008 The weird thing is the simplest of web searches turns up multiple hits which give me the part number and a host of on-line retailers who do the (3 stud) heatshield (can get that for 6 quid on-line!!) and pillars for the original 65A alternator fitted to 300Tdi Defenders but I've not been able to any part number references or on-line retailers for the (4 stud) heatshield for the 100A alternator fitted to 300Tdi Discos although it's mentioned in a couple of places. Got to get some small stuff from our local main dealer this week anyway and will ask if they list it but even if they do I suspect prices will be silly. If I can't find anything I'll just get some standoffs and knock something up to use the old heatshield. Cheers, Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted November 24, 2008 Share Posted November 24, 2008 FWIW I have a 300Tdi Disco engine in my Defender, a 100A alternator and no heat shield with no ill effects. Well, none beyond a front bearing failure of the last alternator just after a weekend of heavy wading... Quote Link to comment Share on other sites More sharing options...
white90 Posted November 24, 2008 Share Posted November 24, 2008 mine fitted Quote Link to comment Share on other sites More sharing options...
MudAllOverIt Posted November 24, 2008 Author Share Posted November 24, 2008 mine fitted Thanks Tony -- that'll do for me and is a much simpler way of fixing it than I was thinking off Quote Link to comment Share on other sites More sharing options...
white90 Posted November 24, 2008 Share Posted November 24, 2008 Been there for 2 years no issues just use some split conduit or insulation on the wires/terminals Quote Link to comment Share on other sites More sharing options...
mmgemini Posted November 24, 2008 Share Posted November 24, 2008 I've had those wires from the alternator nearly fry...... Also they've rubbed on the dipstick tube. So the dipstick tube now has petrol pipe split and covering it. mike Quote Link to comment Share on other sites More sharing options...
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