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#1
11-04-2006, 07:19 PM
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87 300TD Alternator Gone Bad!!!
Ok, my alternator hasent been working for a while, and i finaly got around to fix it..this is the first one im doing on a 87 300 turbo Disel, so i dont know how to change it...
First thing is first how do i loosen the belts..i know there are 2 13mm screws, jst dont know the location of the  ...Thats my biggest issure at the moment so if anyone could give me a step my step on how to do this, or just get me started ill figure it out it would be greatly appreciated... 
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#2
11-04-2006, 09:56 PM
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How do you know the alternator is bad? Usually the voltage regulator unit attached from behind the alternator is the culprit of insufficient charging. Pull the voltage regulator (2 Philips head screws) and check the contact brushes. If one or both aren't shiny, there isn't good contact with the armature.
To remove the belt - there is a bolt with a head and nut that take a 13mm socket. From the factory the bolt is nut to the front and head to the rear but it's often reinstalled the other way. There is a spring that holds the belt in tension. The bolt attaches to the top perch of the spring. The bolt is about 4" long and goes through the head casting. Remove the nut from the bolt, put a big screwdriver in the plastic upper spring perch, lever the perch CCW enough to remove the bolt, slowly release the perch. That will relieve enough tension to undo the belt from the alternator. If you don't have a belt routing diagram, draw the belt path for reference before you slacken the tensioner. Sixto 93 300SD
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#3
11-05-2006, 04:04 PM
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^^ good point i checked the voltage regulators out today and you were right.
thanks for the help
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