Question about 1999 Pontiac Bonneville

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1999 Pontiac Bonneville serpentine belt installation.

On my 1999 Bonneville I need to remove a bolt on the motor mount to get the sewrpentine belt off. Where is the bolt located and what does it look like?

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  • todd185 Jan 04, 2009

    Thanks - I was able to remove the bolt and then replace the serpentine belt. The bolt came out by turning the nut on the end and then aligned correctly on replacement through the motor mount.

  • Anonymous Mar 16, 2014

    Change motor mount on. A 97 pontiac bonneville

  • Anonymous Mar 19, 2014

    1999 Pontiac Bonneville

  • Anonymous Mar 22, 2014

    can't get the serpentine belt off of the pulleys

  • Anonymous Mar 26, 2014

    I want to use 16 inch rims on my 1984 pontiac bonneville



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If you look by the crankshaft pulley to the right you will see a tubular looking shaft about 1" diameter , you will notice you can't get the belt out from under this piece , it has a nut on it , once you take the nut off , you will notice it has a star shaped point on the tip of the stud , it requires a reverse torx socket or wrench to remove the stud , when you get the stud out the tube piece it can be removed , then the belt comes off , replace the belt , now comes the tricky part , fitting that tube spacer back into its spot , it can be difficult , once its in place put the stud back in , and put the nut on and tighten it , your pretty much a pro now . thanks.

Posted on Dec 30, 2008

  • Rick Byrd
    Rick Byrd Jan 03, 2009

    follow up - was this information worth a FIX YA vote ? thanks for voting ! .



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Trying to R & R the serpentine belt on a 1999 Olds Delta 88. The belt is routed arond a motor mount. Do I have to jack the motor and disconnect it from the motor mount in order to remove and replace...

yes you do. place a floor jack under engine with a block of wood on top of jack to protect the engine, put just enough pressure on jack to steady engine. remove motor mount, then jack up engine a bit to take belt off. replace the belt then lower jack and attach the mount. on the mount only the outside bolts need to come off to raise engine. do not remove from engine side unless you are changing it or its bad, be carefull when raising engine, pick it up from a sturdy place, not the oil pan. have a good day !!

Jun 07, 2011 | Oldsmobile Delta 88 Cars & Trucks

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My existing serpentine belt travels around a bracket mounted to the engine to the side of wheelwell. Is it on the correct way? do i need to remove engine mount to remove my serpentine belt?

No you do not have to remove engine mount. There is an idler pulley located to the left of the alternator mounted on the top of the engine. In the middle of this idler pulley/belt tensioner is a 5/8" Bolt. Put a socket on it, turn it away from the belt and slide the belt off. It looks like you have to remove the mount but you will see you do not. A belt routing diagram will help you put it back on. You can draw it yourself before you take it off.

Jan 11, 2011 | 1997 Pontiac Bonneville

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Where is the location of the starter on a 1999 bonneville se and is it hard to take off yourself?

(see Figures 2, 3, 4, 5, 6 and 7)
  1. Disconnect the negative battery cable.
  2. Raise and support the vehicle safely.
  3. If necessary for access, remove the splash shield.
  4. If equipped, unfasten the flywheel inspection cover bolts and remove the cover.
  5. Label and detach the electrical connectors from the starter.

Fig. 2: Unfasten the starter motor electrical connections. You may want to tag them first to avoid confusion


Fig. 3: Exploded view of the starter motor electrical connections
  1. It may allow more room it you remove the right side cooling fan.
  2. Remove the starter-to-engine bolts, then carefully lower the starter from the vehicle.

Fig. 4: The starter is attached to the engine with 2 mounting bolts (see arrows)


Fig. 5: Unfasten the front mounting bolt (1) and remove any necessary shims (2), noting their locations for installation


Fig. 6: Unfasten the long starter mounting bolt, then remove the starter motor from the vehicle

Before installing the starter motor, make sure the electrical terminals are secure by tightening the nuts next to the cap on the solenoid battery terminal and on the "S" terminal. If these terminals are not tight in the solenoid cap, the cap may be damaged during installation of the electrical connections and cause premature starter failure.


Fig. 7: Exploded view of the starter motor mounting - 1987-97 vehicles

To install:
Note the location of any shims so they may be replaced in the same positions upon installation.
  1. Place the starter in position, then install the starter-to-engine bolts and tighten to 32 ft. lbs. (43 Nm).
  2. Attach the electrical connectors to the starter, as tagged during removal. Tighten as follows:
    1. Tighten the nut on the solenoid battery terminal to 12 ft. lbs. (16 Nm).
    2. On the SD-250 and SD-255 models, tighten the nut on the "S" terminal to 22 inch lbs. (2.5 Nm).
  3. If removed, install the flywheel inspection cover and secure with the retaining bolts. Tighten the flywheel cover bolts to 62 inch lbs. (7 Nm).
  4. If removed, install the splash shield.
  5. Carefully lower the vehicle.
  6. Connect the negative battery cable.

Hope helps (remember rated and comment his).

Aug 06, 2010 | 1999 Pontiac Bonneville

1 Answer

The old belt broke and im not sure how the new one should go it looks like i need to remove th motor mount to install the new belt?

on the bottom of the motor mount is a bolt that you remove. it is on the right side of the bracket at the bottom where there is a spacer that you can remove so you can install the belt

Jun 28, 2010 | 1999 Pontiac Bonneville

1 Answer

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Hey Liv. You have to place a floor jack under the engine oil pan and support the engine. Now you have to remove the engine mount on the passenger end of the engine. you will need a 18mm wrench and some inverted torx bit sockets as the lower stud has to be removed to allow the mount to be removed. The two 18mm bolts will be really tight and should be tightened so when reinstalled. Remove the long bolt that goes thru the mount horizontally also. now you can remove the belt with the 18mm wrench on the tensioner. study the belt routing and remove it. install the new belt and reinstall the mount in reverse order. good luck and don't get hurt loosening the bolts. use gloves if you can.

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Nov 14, 2009 | 1997 Pontiac Bonneville

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Can the bottom section of the motor mount be removed to that the serpentine belt can be replace?

the bottom bolt of the motor mount can be removed. There is a cylindrical metal spacer there that drops out when the bolt is removed, leaving plenty of room for the belt.

Jun 22, 2009 | 1995 Pontiac Bonneville

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Dec 10, 2008 | 1997 Pontiac Bonneville

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