Question about 1990 Mercedes-Benz 300 Diesel

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Have installed new belt on my 1986 300E and have loosened 19mm tensioner bolt out 1/4 inch... it's not giving the slack to get the belt over the alternator pulley so I can finish the job... please advise... Randy J

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  • randyinuc2 Jul 14, 2008

    1. There does not exist sufficient slack to do this even if it were an appropriate method, which it positively is NOT.

    2. The belt is supposed to be slacked and tensioned with the tensioner... removal of the pulley from the alternator and trying to force it back on with a serpentine belt of this diameter and torque could damage the alternator.

    3. I posted my message relevant to using the appropriate method with the tensioner... I expect the answer to be relevant to my question, and not be charged for an irrelevant and innappropriate answer. I am unable to get to my employment due to this problem and need to get this answer quickly by someone whom knows what they're talking about... namely a MERCEDES EXPERT, not someone with general automotive knowledge.

  • randyinuc2 Jul 14, 2008

    1. There does not exist sufficient slack to do this even if it were an appropriate method, which it positively is NOT.

    2. The belt is supposed to be slacked and tensioned with the tensioner... removal of the pulley from the alternator and trying to force it back on with a serpentine belt of this diameter and torque could damage the alternator.

    3. I posted my message relevant to using the appropriate method with the tensioner... I expect the answer to be relevant to my question, and not be charged for an irrelevant and innappropriate answer. I am unable to get to my employment due to this problem and need to get this answer quickly by someone whom knows what they're talking about... namely a MERCEDES EXPERT, not someone with general automotive knowledge.

  • randyinuc2 Jul 14, 2008

    HELP !!! WAS CONNECTED RECEIVING ASSISTANCE AND LIVE CHAT DISCONNECTED

  • Bill Bellomy
    Bill Bellomy May 11, 2010

    Randy-

    Somehow, my chat utility turned our screen gray and cut me off!!!

    -WildBill

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I hate to sound dumb, but are you sure you have it on correctly? When the tensioner is loose, the belt is of no consequence. Only if it's not properly put on is there a problem.

Posted on Jul 26, 2008

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You may remove alternator pulley and replace with belt over it.

Posted on Jul 14, 2008

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How to put on a water pump


It's easier than you think. Pull front covers off under hood that cover radiator area. One is a plastic guard and under that is the metal support. Pull electric fan out by unbolting it from sides and 2 clips on top and electrical connector. Now you have room to work. Loosen belts by loosening bolt in center of pulley then loosen them by turning adjustment bolt. pull off belts then pull off these pullies with their brackets as one unit off front cover. Take off front covers by taking off 10mm bolts. Crank area has a triangle shaped plate and you can and just loosen bottom 10mm bolt and take off the two above. now slide cover up and you can see water pump. Set cams on their marks for reference, they have a dot on cams and a slot on housings. loosen timing belt tensioner on bottom of engine and evenly pull bolts to get slack on timing belt about one inch should be enough. now you can pull pump off and slide it out being careful not to let belt slip on cams and lose timing. install the same way, then slowly turn each bolt up on hydrolic tensioner to ease tensioner center pin back to position. make sure timing marks are ok then put everything back by reverse order. Or you can also pull radiator and bottom crank pulley with a 3 jaw puller and replace belt with new one. This involves pulling out tensioner also. tensioner can be collapsed in vice slowly then use suitable pin to go through center pin and its case to keep it collapsed, set on new belt and pull pin after tensioner is installed to set belt tension. I hope this helps GOOD LUCK.




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How to replace alternator belt


Find the belt tensioner bolt and loosen it. There will probably be two other bolts that need to be loosened (just loosened not removed). Move the alternator to its " most slack position" pull the old belt off anf fit the new one. Push the alternator with a broomstick or something similar to tension the belt. (Be sure to push against a solid part of the alternator or you could break it) tighten the tensioner bolt. the tension should be set so that you can push the belt in about 20mm between the pullies with your finger. If the new belt squeels when you start the car the belt is too loose. Tighten the other two mounting bolts.
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Need belt routing diagram for 2001 chrysler sebring lxi


Thanks for using FixYa.




jturcotte_2444.gif

Fig. Accessory drive belt routing-2.7L engine
Chrysler Cirrus & Sebring Convertible; Dodge Stratus; Plymouth Breeze



jturcotte_2445.gif

Fig. Accessory drive belt routing-Chrysler 2.7L engine





2.7L Engine
A/C & Alternator Belt

  1. Raise and safely support the vehicle.
  2. Remove the right front wheel and belt splash shield.
  3. Loosen tensioner locking bolt and pivot bolt.
  4. Rotate tensioner clockwise to allow enough slack to remove belt

To install:
  1. Install the air conditioning compressor/alternator belt on pulleys, tensioner in slack position, slip belt over idler last.
  2. Adjust drive belt tension.
  3. Install the belt splash shield and right front wheel.
  4. Lower vehicle.
    jturcotte_2446.gif

    Fig. Installing A/C & alternator belt-2.7L engine


  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Raise and safely support the vehicle.
  3. Remove the right front wheel and belt splash shield.
  4. Loosen the tensioner locking bolt and pivot bolt.
  5. Rotate tensioner clockwise to allow enough slack to remove the belt

To install:
  1. With the tensioner in a slack position, install the Air Conditioning (A/C) compressor/alternator belt on the pulleys. Slip the belt over the idler last.
  2. Adjust the drive belt tension.
  3. Install the belt splash shield and right front wheel. Tighten the wheel lug nuts to 100 ft. lbs. (136 Nm).
  4. Lower the vehicle.

Power Steering Belt
  1. Raise and safely support the vehicle.
  2. Remove the right front wheel and belt splash shield.
  3. Remove the air conditioning compressor/alternator belt.
  4. Loosen belt adjusting bolt. It is not necessary to loosen the pivot bolt on the power steering pump. There is a bushing incorporated into the power steering pump/bracket that allows it to pivot.
  5. Remove the power steering belt.

To install:
  1. Install the power steering belt on pulleys.
  2. Adjust drive belt tension.
  3. Install the air conditioning compressor/alternator belt.
  4. Install the belt splash shield and right front wheel.
  5. Lower vehicle.


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daves944_3.jpg

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