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#1
07-24-2013, 03:37 PM
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Nut won't loosen to change Alternator belt on 1977 300D
I'm trying to change the alternator belt for a 77 300D and can't get the nut to loosen. I tried penetrating oil, but no luck. I heard that heating a nut with a blowtorch can make it easier to loosen, but I'm worried that that might mess some stuff up with the alternator or other parts of the car. Do you guys think that would be safe to try? Any other suggestions?
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#2
07-24-2013, 03:50 PM
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which nut are you talking about?
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 Current Mercedes 1979 maple yellow 240D 4-speed Gone and fondly remembered: 1980 orient red 240D 4-speed Gone and NOT fondly remembered: 1982 Chna Blue 300TD Other car in the stable: 2013 VW Jetta Sportwagen TDI / 6-speed MT
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#3
07-24-2013, 04:26 PM
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I believe there is three bolts holding on the alternator. You have to loosen the two bolts that hold the alternator to the block, then loosen the bolt with the gear, this is the tension bolt....this is the bolt you use to tighten or loosen the alternator to tighten or removal the belt...you have to remove the ac belt and power steering belt first before you remove the alternator belt.
Heres a picture, you can see the bolts that need to be loosened 200, 230, 155....tell us which one you are having issues with 
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#4
07-24-2013, 04:36 PM
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Long handle 6 point box end wrench. Hold bolt and turn nut.
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2009 E320 Bluetec 117,000 1995 E300D 306,000 Sold 1996 Ford Taurus LX 130,000 Sold 1985 300TD Still 225,000 Sold 2016 Ford Fusion 24,900
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#7
07-25-2013, 10:10 AM
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155 that one is a bear sometimes... it sits in a steel tube that collects salt and water and can corrode badly...
best thing to try is SOAKING the alternator base in PB Blaster or AeroKroil for a day and whacking the alternator base with a mallet every so often... then, get a HONKING big 6 point socket on a 1/2" breaker bar, and POP against the wrench...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
07-25-2013, 10:12 AM
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230 technically doesn't need to be loosened... but the same treatment should be used for it as well...
hold the nut on the other end, perhaps even try loosening the nut instead of the bolt...
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#10
07-25-2013, 01:35 PM
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Harbor freight has a nice long breaker bar/hinge handle that's got a ratcheting end... but it's junk after one use. SUPER handy while it works though.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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