my 82 300SD has a problem with belts needing to be tightened.
the repair can be startling! ok first, the pair of altenator belts are the innermost belts, so of course they are the thinnest and most likely to need tightening... great design! (anyone know of a serpentine kit for the old turbo diesels?)
before you losen all the bolts to adjust the belt tension, OIL THE ADJUSTER BOLT WITH PB BLASTER!!! the special bolt that tightens the belts is very thin, and any rust... 45.00 bolt replacement! also, make sure you losen ALL THREE bolts that mount the altenator. they are 17MM they all losen from the back of the alt, and if you forget one... 45.00 bolt replacement! (anyone know where to get reproduction bolts for less?) two are through the alt. the third is on top of the bracket that holds the alt. only need to losen it a bit.
ok, now if you need to replace the belts... and who dosent? you will need to loosen and remove the AC belt and the PS belt. the ac has two bolts through it from the back of the compressor, they are 19MM I find the best way to get at them is with a 1/2" "breaker bar and a 6point shallow socket. a rachet will not fit between all the lines up there, and the top bolt can't be reached with a open end. then back off the adjuster nut... don't lose it. my car had someone break off the adjuster bolt on the PS pump, DON"T OVERTIGHTEN THE ADJUSTER BOLTS!!! the PS adjuster bolt is threaded into the soft aluminum body, it breaks easily.
oh, and I don't know how well this will hold up over time, but the injector return lines are hard to find. my local lawnmower repair shop stocks a clear fuel line that is the same id. real low cost solution to a leaking return line!
John