MuddyWinny Posted December 16, 2015 Share Posted December 16, 2015 It's time for a new alternator and I was wondering if there is a reason to buy a particular version other than pulley size and price. The 300tdi came from a M reg Discovery. The alternator currently fitted has the smaller diameter pulley and is not the original one (no surprise) so I don't know what pulley size was originally fitted. So far I have learn't: YLE10113 - Fitted to early 300Tdi engines AMR4248 - Fitted 94-96 now supersedes to AMR5425 AMR5425 - Fitted 97-98 All 3 are still available. Looking at Denso, prices vary from £116 for YLE10113 to £162 for AMR4248. AMR5425 is around £125. Is there reason to favour AMR5425 over YLE10113? I can see the the casing is different between the two with AMR5425 looking like it has more vents and would possible cool better. Does anyone know of any reason to favour one over the other? Thanks Mark Quote Link to comment Share on other sites More sharing options...
vulcan bomber Posted December 16, 2015 Share Posted December 16, 2015 The pully will be interchangeable between the old and new alternator. The smaller pully was used to simply give more volts at idle. The mounts the same on all 300s so all the alts will fit. Might be worth getting your current unit reconned instead. Quote Link to comment Share on other sites More sharing options...
MuddyWinny Posted December 22, 2015 Author Share Posted December 22, 2015 Thank for your reply. I can pick up an exchange unit for £80 to £90. I was just wondering if there was any preference in the two designs. Quote Link to comment Share on other sites More sharing options...
dave88sw Posted December 22, 2015 Share Posted December 22, 2015 I doubt there's any real benefit to one over the other but i would use the smaller pulley, as above, it spins faster at low rpm giving better voltage. Just make sure you use the right length belt if you're changing from big to small pulley Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted December 22, 2015 Share Posted December 22, 2015 I don't often see 300TDI's now,but when I did I was very disappointed with most of the alternators on sale,esp the Denso ones. They seemed to last about a month out of warranty. Genuine Bosch exchange ones cost a bit more, but did last alot longer. Quote Link to comment Share on other sites More sharing options...
Range Rover Blues Posted December 22, 2015 Share Posted December 22, 2015 The smaller pulley was common to the V8, though from the interim engine onward you can't use the short bodied V8 alternator. The large pulley was stopped at the same time as the soft dash RRC was dropped (including the interim V8). Is the 97-98 alternator still the same rating? Quote Link to comment Share on other sites More sharing options...
MuddyWinny Posted December 23, 2015 Author Share Posted December 23, 2015 Thanks for the replies. Yes, all three are 100 amp. I'll take a look at Bosch. Mark Quote Link to comment Share on other sites More sharing options...
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