=jon= Posted May 30, 2017 Share Posted May 30, 2017 (edited) Hi All I'm trying to source the 'right' alternator for my 4.6 - I bought a second hand unit from here, but it looks like the mountings are wrong, with the lugs being too narrow for the cast carrier... The alternator is listed as a Denso A127i - 100 which google suggests is indeed for a Serp v8. Do I have the bracket for a later 150A Bosch alternator, which I understand have different fittings? Am I going to be better off changing the bracket than sourcing a Bosch alternator - are these ECU controller rather than an onboard reg? Cheers Jon Edited May 30, 2017 by =jon= Quote Link to comment Share on other sites More sharing options...
elbekko Posted May 30, 2017 Share Posted May 30, 2017 IIRC the Bosch alternator is still internally regulated, not by the ECU. That mount doesn't look like either the GEMS or Bosch mount, maybe it's the intermediate serp mount? Pictures stolen from the interwebs where you can see the mounts for both Bosch and GEMS: GEMS: Bosch: Quote Link to comment Share on other sites More sharing options...
=jon= Posted May 30, 2017 Author Share Posted May 30, 2017 Hmm - thanks for that. The source engine was a GEMS, but it doesn't look the same. Next time I'm where the engine is I'll grab a pic of the bracket in situ as that will probably help! Quote Link to comment Share on other sites More sharing options...
L90-v8 Posted May 30, 2017 Share Posted May 30, 2017 get a pic of the front end of the engine theres so many different serp front ends you never know if someones changed it from original Quote Link to comment Share on other sites More sharing options...
simonb Posted May 30, 2017 Share Posted May 30, 2017 (edited) The 100A alternators for the V8 and Tdi are similar, but not identical. There is a difference in the width between the front and back mounting lugs (see earlier pics). By the sounds of it, you may have the (narrower) Tdi version - which could be why the "other" hole doesn't line up - assuming as others point out - its the correct bracket. Edited May 30, 2017 by simonb Quote Link to comment Share on other sites More sharing options...
=jon= Posted June 9, 2017 Author Share Posted June 9, 2017 I didn't get a decent pic of the front of the engine, but the mounting holes are approx 158mm centre to centre across the front of the alternator bracket. Part number stamped on it is ERR6892 which appears to be a P38 / Disco 2 alternator bracket. As the bracket is 'flat' - am I missing an intermediate vertical bracket that goes between ERR6892 and the alternator fittings? https://auto-parts-lab.myshopify.com/products/land-rover-discovery-2-ii-alternator-tensioner-bracket-err6892-oem-2003-2007 Quote Link to comment Share on other sites More sharing options...
=jon= Posted June 12, 2017 Author Share Posted June 12, 2017 (edited) Here's a pic of the front of the engine At the moment we've not figured out the belt routing - it looks like there's a couple of ways you can mount the idlers / tensioners that changes things. We don't have an AC compressor so will probably have to figure out the non AC serp routing. I bought a non AC belt, but it doesn't seem to work whichever way we try length wise... Edited June 12, 2017 by =jon= Quote Link to comment Share on other sites More sharing options...
L90-v8 Posted June 13, 2017 Share Posted June 13, 2017 this is a gems mount you might have a thor alternator mount Quote Link to comment Share on other sites More sharing options...
=jon= Posted June 13, 2017 Author Share Posted June 13, 2017 Great - thanks... Looks like I'm getting somewhere now Quote Link to comment Share on other sites More sharing options...
L90-v8 Posted June 13, 2017 Share Posted June 13, 2017 this is a 3.9 serp mount part no err4514 Quote Link to comment Share on other sites More sharing options...
L90-v8 Posted June 13, 2017 Share Posted June 13, 2017 just noticed your got thor rocker covers the jems filler cap is n/s the thor is o/s Quote Link to comment Share on other sites More sharing options...
=jon= Posted June 13, 2017 Author Share Posted June 13, 2017 Yeah, it's a bit of a bitsa engine It's built out of GEMS bits, but with a thor inlet - we put thor rockers on it so that you can get to the oil cap easily Quote Link to comment Share on other sites More sharing options...
=jon= Posted July 3, 2017 Author Share Posted July 3, 2017 Just a bit of an update - sourced a GEMS alternator mount and the alternator seems to fit this OK - thanks for your help! Quote Link to comment Share on other sites More sharing options...
=jon= Posted July 18, 2017 Author Share Posted July 18, 2017 Does anyone have any ideas on how a GEMS serp non-AC belt routing looks like? This is what we have come up with so far, but the GEMS non-AC belt appears to be the wrong length. I know we have an AC mount but no compressor, does that change the layout from a 'true' non AC setup? Quote Link to comment Share on other sites More sharing options...
elbekko Posted July 21, 2017 Share Posted July 21, 2017 (edited) Without: With: Edited July 21, 2017 by elbekko Images don't work Quote Link to comment Share on other sites More sharing options...
=jon= Posted July 21, 2017 Author Share Posted July 21, 2017 elbekko - many thanks, that's perfect. So it looks like we are on the right tracks - possibly if we lose the right hand idler the standard non-ac belt will fit... Cheers Jon Quote Link to comment Share on other sites More sharing options...
elbekko Posted July 21, 2017 Share Posted July 21, 2017 Yup, that's only there to ensure some wrap on the aircon pulley. The stock non-ac belt should fit fine. If it doesn't, get a piece of string, wrap it around everything, and mark the length you need. Then go to a parts store and ask for a xPKyyyy belt, where x is the number of grooves and yyyy is the length in mm. Quote Link to comment Share on other sites More sharing options...
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