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  #1  
Old 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  
Old 07-24-2013, 03:50 PM
zeke's Avatar
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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

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  #3  
Old 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  
Old 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 108,000
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1985 300TD Still 225,000
2016 Ford Fusion 14,900
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  #5  
Old 07-25-2013, 09:52 AM
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Yeah, the bolt labeled 155 is the one I'm trying to loosen that won't budge, that is the proper one, right?
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  #6  
Old 07-25-2013, 10:07 AM
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ACtually, the 230 isn't wanting to move either...
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  #7  
Old 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  
Old 07-25-2013, 10:12 AM
vstech's Avatar
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Location: Mount Holly, NC
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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...
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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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  #9  
Old 07-25-2013, 11:12 AM
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Called in my grandfather to let me borrow his breaker bar and that did the trick, thanks so much for the help!
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  #10  
Old 07-25-2013, 01:35 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,179
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.
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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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