300 tdi Starter and Alternator - Defender Source
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  #1  
Old February 21st, 2012, 09:04 AM
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Jimmy
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300 tdi Starter and Alternator

My starter has been intermittently failing when it is very cold, so I need to replace it. I have contacted a few people that I buy parts from and neither have been able to find me one at a reasonable price. Where are you guys buying starters?

As for the alternator... Mine has finally pissed the bed, after having the main cable fall off multiple times due to someone previously stripping out the stud. After some searching I have seen people mention that the V8 alternator will work. Is there any modification need to make it fit, other than a bigger cable? I seem to remember the posts I saw about the V8 alternator being for a 200 tdi.

Thanks!
Jimmy
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  #2  
Old February 21st, 2012, 11:11 AM
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It's failing because of old grease in the solenoid.

My starter has about 115,000 mile on it. It started acting up this last October (cold), clicking, slow to engage, then quit all together. So I took it apart cleaned it up, blew it out with compressed air, cleaned the stator gaps, inspected the brushes, lightly greased the solenoid. The main thing I have found with a Bosch starter failure is the solenoid grease gets old and hard and won't allow it to operate. If you do all this and it still doesn't work, get it rebuilt locally, there's no need to spend $3 to 4 hundred on a new one unless you want to have a spare on hand while way off road. One of the easiest starters to remove too, you don't even have to get under the vehicle.

My alternator is acting up too, but I have a spare on hand that I bought from BP. The best price is probably to be had is from RovahFarm. It's a simple alt, actually and old Ford part. These can be rebuilt too.
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  #3  
Old February 21st, 2012, 12:56 PM
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Quote:
Originally Posted by Dennis View Post
It's failing because of old grease in the solenoid.
The issue I have is when it is under heavy load (cold temps) the spur will back out and keep spinning without turning the motor. Sometimes it stops spinning after a couple of seconds, sometimes it will go on for a while. If I disconnect ther battery it stops, but when I reconnect it, it sometimes still spins. I don't have the issue all the time, so I'm not in a huge rush to fix it.
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  #4  
Old February 21st, 2012, 01:06 PM
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Quote:
Originally Posted by Jymmiejamz View Post
The issue I have is when it is under heavy load (cold temps) the spur will back out and keep spinning without turning the motor. Sometimes it stops spinning after a couple of seconds, sometimes it will go on for a while. If I disconnect ther battery it stops, but when I reconnect it, it sometimes still spins. I don't have the issue all the time, so I'm not in a huge rush to fix it.
You can probably just R&R the bendix then. It is probably dirty and needs a good clean and lube. Worst case is a new solenoid.
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  #5  
Old February 21st, 2012, 01:10 PM
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Quote:
Originally Posted by Dennis View Post
The best price is probably to be had is from RovahFarm. It's a simple alt, actually and old Ford part. These can be rebuilt too.
you have that part number by chance?
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  #6  
Old February 21st, 2012, 01:12 PM
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Personally I would suggest going with an OEM (Marelli) 100 Amp alternator instead of whatever you might have at the moment OR talk to Pendy as I believe he does up a better than stock alternator.
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Old February 21st, 2012, 01:23 PM
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Quote:
Originally Posted by Red90 View Post
Personally I would suggest going with an OEM (Marelli) 100 Amp alternator instead of whatever you might have at the moment OR talk to Pendy as I believe he does up a better than stock alternator.
will do. thanks!
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  #8  
Old February 21st, 2012, 02:19 PM
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Quote:
Originally Posted by Red90 View Post
Personally I would suggest going with an OEM (Marelli) 100 Amp alternator instead of whatever you might have at the moment OR talk to Pendy as I believe he does up a better than stock alternator.
Is the 100 amp alternator the same as one from a V8 truck? Got a part #?
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  #9  
Old February 21st, 2012, 02:26 PM
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AMR4248: Stock 100 Amp alternator for Discovery 300TDIs with air con.

It is different than the V8 (STC1753) which has the adjuster on the other side and I think a different width mount.
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  #10  
Old February 21st, 2012, 02:27 PM
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There is a drop in alternative, just have to swap the pulley, 100 amps, from Iskra and it's about 180$. I have mine for 2 years now, no problems so far.
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  #11  
Old February 21st, 2012, 04:21 PM
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The 300tdi alternator has a weird swing and pad dimensions and I was never able to find a Bosch one to fit.

As JFD said, there are some alternatives, ones from a Ford Transit (do you get those in NA ?) and another is from a New Holland tractor. Most of these end up being MM's in a different box.
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  #12  
Old February 22nd, 2012, 06:06 AM
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Yeah, it sounds like the solenoid is just sticking. A rebuild of it, or replacement, would likely solve your problem. Though while the starter is out it wouldn't hurt to have it checked out by your local automotive electrical shop.
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  #13  
Old February 22nd, 2012, 07:05 AM
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I have seen people use a RRC alternator on a 300tdi. One of the rear ears needs to get sawed off. Can't help beyond that.



Quote:
Originally Posted by Red90 View Post
AMR4248: Stock 100 Amp alternator for Discovery 300TDIs with air con.

It is different than the V8 (STC1753) which has the adjuster on the other side and I think a different width mount.
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