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#1
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anyone ever taken the blower motor apart?
I opened up the compartment for my non-functioning blower fan and determined that it is not broken, because if I push on one of the connector terminals, it will blow. It is a bad connection from the connector to the interior of the fan (it's not just the connector wires, because I cleaned them off.
I got the fan out, but I need to take it apart to get at the connectors where they connect internally. How do you take the blower fan apart? There is only one screw, but it doesn't seem to allow you to take the plastic shroud away from the rest of it to get at the internals. Any tips? thanks PS it is a 126 - 83 SD in case you don't read my sig.
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles |
#2
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The brushes on the motor are probably burned down. You can buy replacements.
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle. |
#3
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No, the brushes are not worn down. The problem is a bad connection to one of the terminals where the wires connect. When I hold the connector upward towards the fan part (with power to the fan), the fan begins to spin.
Any idea how to get at the inner parts of the motor? I can't get the fan blade part or the shroud off.
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles |
#4
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You may be right after all about the brushes, as I could see when the shroud was off that the electrical connections go straight to the brushes.
For anyone else's future reference, you just need to take the screw out where it goes through the shroud, and pull the plastic shroud off. On mine, it was stuck together probably from 25 years of not being pulled apart so I didn't think it came apart that way, but it just took a little more tugging. I didn't have any brushes on hand for the blower, so a small woodchip laying on the driveway wedged in by the contact provided enough leverage to make the brushes contact for now until I can make the real repair.
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles |
#5
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Are you asking how to separate the squirrel cage and motor?
I did mine with a drift punch. Ensure that the empeller is supported very well and the motor will drop onto a soft surface, such as a piece of foam. A couple of good raps and it dropped right out.
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#6
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I have seen 2 styles of squirrel cages. If you have a nut it will be a left handed thread. If you have a pressed on model support the cage properly from all sides using a bearing press cage or similar apparatus, use a punch and tap the shaft out of the squirrel cage. This should be fairly simple to do. After apart the blower motor should simply have bolts holding it together that once removed will allow the assembly to pull apart. The brushes are eary to replace.
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#7
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Alas, my "fix" (wedged wood chip) didn't last long and I will need to pull it out again. I have no idea what the squirrel cage is. What I am talking about is when you pull the blower out of the car entirely... In the car, there is a sort of box that it is inside of, which you have to open up in order to get at the fan (fine, ok)... but when you unscrew the blower from under the dash, and pull it out, then there is still a plastic sort of shroud around it (which is what has the screw holes to actually hold the whole fan up inside of the car). That shroud was what I was having problems with.
Well, I figured out how to get that plastic mount off of the fan, but what I couldn't figure out after that was how to get at the brushes. It seemed to me like there was some little metal cages (are these the squirrel cages???) with springs in them about 1cm x 1cm x 4 cm deep, which I thought maybe were holding the brushes in tension to keep the electrical contact... but I have very minimal experience with electric motors, and that was just my guess from looking at it... Where are the brushes actually located and how do I get at them?
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles |
#8
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bump...
any hints on how to get at the brushes?
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles |
#9
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The squirrel cage is the green plastic fan blades.
I ended up buying a new motor. I could not get the motor apart due to the way it is held together with out screws. Mine has a press fit and chiseled tab look to it. New motor was close to $100. If you order a new one with the squirrel cage and black plastice, it is around $400.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#10
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If you're fairly determined and skilled with a small screwdriver, you can carefully move the tension springs behind the brushes out of the way, and get the brushes out (at least on the one in my 300SD you could).
The motor itself was staked and apparently welded together in mine, so I couldn't disassemble it further to check for undue wear, or to see if I just had something stuck in the bushings. I finally ended up just replacing the motor with one from a parts car another semi-local resident sold me.
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-Josh Testing the cheap Mercedes axiom, one bolt at a time... |
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