gregdiscovery Posted September 5, 2010 Share Posted September 5, 2010 hi all have had my disco 300 for a few months now, well im was curious to what revs should the engine be doing at 70 on the motor way. as mine seems to be around 3250 at 70 in 5th gear is this correct? its a five speed manual with the r380 box. thanks for the help Quote Link to comment Share on other sites More sharing options...
M&S Posted September 6, 2010 Share Posted September 6, 2010 Sounds about right. Quote Link to comment Share on other sites More sharing options...
piper109 Posted September 6, 2010 Share Posted September 6, 2010 That sounds too high. Mine shows about 2800 rpm at 70 mph. Is your alternator stock? Steve Quote Link to comment Share on other sites More sharing options...
BogMonster Posted September 6, 2010 Share Posted September 6, 2010 To elaborate, the 300Tdi can have two alternators fitted one has a 49mm pulley and one has a 61mm pulley and the rev counter in the vehicle needs to be calibrated for the correct one, so if somebody has fitted the wrong one at some point in the past (or changed the rev counter) it will rubbish up the reading. Also the belts are a different length. I think it sounds a little high so chances are it has the small pulley and the rev counter is calibrated for the big pulley. How old is the vehicle? Quote Link to comment Share on other sites More sharing options...
KenM Posted September 6, 2010 Share Posted September 6, 2010 Could possibly be that the transfer box has been swapped to a higher ratio one in the past Ken Quote Link to comment Share on other sites More sharing options...
gregdiscovery Posted September 6, 2010 Author Share Posted September 6, 2010 hi thanks for the replies. its a Mreg also it had a new alternator fitted just before i bought it and its not a landrover one, cant really see any names on it apart from the remains of a label with a part no. on it. Also had to fit a new binnacle as the one in when i bought it was stuffed thanks for the help. Quote Link to comment Share on other sites More sharing options...
SPendrey Posted September 6, 2010 Share Posted September 6, 2010 You could look at the aux belt... if it is marked 1580 it'll be the 'new' alternator size, if it is 1595 it'll be the 'old'. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted September 7, 2010 Share Posted September 7, 2010 You could look at the aux belt... if it is marked 1580 it'll be the 'new' alternator size, if it is 1595 it'll be the 'old'. That assumes the correct belt has been fitted for the alternator which may not be so If it is M reg it probably should have the large pulley (this was fitted to the first year or so of production), and it probably has the small pulley fitted as later 300s all had that, so that would explain the rev counter reading. Cheapest option would be to get the correct pulley, it should fit and the alternator is otherwise the same. Quote Link to comment Share on other sites More sharing options...
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