Question about 1981 Ford F 100

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I cannot loosen the alternator enough to put new fan belt on. Does the nut on the bottom side of alternator need loosened in order for alternator to spin down?

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Yes it does

Posted on Jan 01, 2011


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1 Answer

How to replace alternator

You don't say what type of vehicle it is but generally there is one bolt on the top sliding bracket that should be loosened first. Then loosen the bottom bolt (its a long one) You may have to use two spanners.(one to hold the head of the bolt while undoing the nut with the other) When the bottom bolt is slightly loosened pull up on the fan belt and the alternator will move up making it possible to remove the fan belt from the alternator pulley.Fitting the new alternator is the reverse process

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How to tide belt

okay loosen alternator pivot bolt that is the bottom bolt below the alternator pulley,loosen also top pivot bolt to alternator.then you have long adjuster bolt top upper side alternator you need to loosen adjuster bolt lock nut then tighten the adjuster bolt to get alternator belt belt tension should be 170 - 180 ft lbs, used drive belt tension is 95 - 135 ft lbs, torque adjusting lockbolt 13 ft lbs, pivot bolts to 41 ft lbs.

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Oct 02, 2011 | 1999 Mitsubishi Montero Sport

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How to Install a new Alternator Belt on a 1998 Mitsubishi Mirage?

First take off the negative battery cable, facing the back of the car reach UNDER the alternator and loosen the bolt on the bottom right side, now loosen the bolt on the adjuster block on top, you can now turn the adjuster bolt and move the alternator to change the belt. If you need to change the steering pump belt on the front of the motor, you need to loosen the nut on the back side of the pulley it holds the adjuster pulley in place . Then you can use the adjuster belt to move the pulley to adjust the belt.

Oct 31, 2010 | 1998 Mitsubishi Mirage

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Assuming this is a XG 350, the process is lengthly.
1. Remove the RH radiator cooling fan (two 10mm bolts at the top & wiring harness connector to it).
2. Lift vehicle to remove the Right Front wheel (then remove 4 10mm bolts securing the plastic splash shield & remove it)
3. Loosen the 14mm nut on the alternator belt tensioner pully
4. Loosen the tension on the belt by rotating (counter-clockwise) the 14mm bolt at the bottom of the idler pully and remove the belt.
5. remove the pully & the idler pully (three 12 mm bolts)
6. Loosen the 14mm nuts at the top and bottom mounting points of the alternator.
7. Using a floor jack (or vehicle lift), support the engine using a jack-stand & 2x4 piece of wood under the oil pan.
8. This is tricky - lift the engine 'SLIGHTLY' to take pressure off the front engine mount - loosen the 17 mm nut on top of the mount itself and observe engine movement. If the engine moves upward 'slightly' remove the 17mm nut - if not, raise the engine slight more until you see the mounting bracket rise off the mount.
9. Remove the remaining 17mm nut (deep well socket), and two 17mm bolts and remove the engine mount bracket.
10. Here's another tricky step. Some 350's bottom Alternator bolt bores are 'SLOTTED'... some are NOT. You'll need to determine wether you'll need to REMOVE the lower bolt, or just loosen the mounting sleeve at the bottom bolt. If it's 'sleeved', I use an air hammer to loosen the sleeve. If it's not slotted, I remove the lower bolt (it's the only way to remove the alternator and pry it off).
11. At the top is an "L" bracket which uses two 12mm bolts to attach it to the engine (head). One of the two 12mm bolts is difficult to get to -- do your best to remove it because the battery cable to the alternator is in the way.
12. Disconnect the alternator wiring (battery cable & regulator harness connector)
13. Lift the engine as high as it will go & pry the alternator off its lower mounting.
14. manuver the alternator upward taking care not to damage the radiator.
15. Installation is in reverse order.
NOTE: If your XG's lower mounting point was slotted, your task is easy. If it isn't, your task now becomes more difficult as you must align the new alternator to facillitate re-insertion of the lower bolt.
PS If not slotted, I use a telliscoping magnet to help re-insert the lower bolt.

Aug 09, 2010 | 2004 Hyundai XG350

1 Answer

How to fit fan belt for mercedes 250 deisel

1- Loosen the Tension Lock Nut between the power steering pulley and water pump pulley first. This is important. Otherwise, it will cost you more to replace the tension nut kit. 2- Loosen the Tension Nut next. 3- There are 2 bolts to hold the alternator on to the engine bracket, Loose the top one while remove the bottom one. Use the top one as a pivot point to move the alternator to get the belt out and in. 4- After put the new belt in, follow the reverse order. Have fun in a hand-on job.

Oct 09, 2009 | 1990 Mercedes-Benz E-Class

1 Answer

I have a 99 mitsubishi diamante and i broke the power steering belt how do i put it back on

Looking at the front of the engine you should see, from left to right, the PS pump, a tensioner pulley, and the crank pulley.

Loosen the 14mm fixing bolt and the 14mm fixing nut on the tensioner pulley.
On the bottom there is a 14mm adjuster bolt, loosen it to slide the pulley downward. It helps to have a swivel socket to access this bolt.
The belt goes around the outside of all 3 pulleys.

The alternator belt will need to be loosened to get the PS belt on behind it.
Between the Crankshaft pulley and the ac compressor pulley you will see another adjuster. Simply loosen the 14mm nut on the center of the pulley, then loosen the 14mm adjuster bolt sticking out the bottom to slacken the belt enough to slip it off.

Use the same adjusters to tension the belts once installed, and tighten down all fixing nuts/fixing bolts.

Be advised: If you broke your PS belt, you should verify your pump and tensioner pulley are in good shape and spin freely, and were not the cause of belt failure before putting on a new belt!

Sep 09, 2009 | 1999 Mitsubishi Diamante

3 Answers

I need to replace to replace fanbelt on 300D 1984 mercedes.

Transit Guru360 is right, It's not so hard and you might remove a few extra nuts...but once you've done it, it's a piece of cake the next time.

I just did this on my 300CD and this is what you do...

I dont have a AC belt since my AC doesn't work I removed it a while ago

1 You'll need:
a. a nice long pry bar (for tightening belts later)
b. a pair of 13m and 17mm wrenchs as well as sockets to do other side of each bolt.
c. a pan for the antifreeze to drip into since you'll remove the top hose to give you more room to
work and it will be full of antifreeze.
d. straight screwdriver
e. Some Gojo...yes working on diesels is a dirty dirty job

First take off top radiator hose, then smaller overflow hose, then upper and lower air intake hoses and unplug that little wire...not sure what it does, but it's in the way.

The power steering and alternator both have 3 bolts that hold them in'll have to remove the power steering belt first. These are all 13mm. If standing at drivers side, there's a bold at bottom of powr steering pump, its an adjustment kind, remove the nut or just loosen it but leave bolt in.

Then remove the other two bolts, they are recessed in the back of pump on lower side. You can see which ones they are by looking for the nuts on front of pump. Loosen them and remove them.

Pump will be totally loose now, take off that belt and carefully finagle it around fan and off if need replaced, if not, just drop and let hang for now.

Then onto Alternator which will be bottom left of engine as you look at front of engine. Theres a through bolt on bottom of alternator, just roll up your sleevesand climb under car and use 17mm wrench...the alternator is threaded so there's not nut down there to loosen. Dont remove this bolt, just loosen it well.

Now loosen the top 2 bolts, dont worry about the adjustment, mine was stripped...and my adjustment was the prybar:) Loosen those but dont remove them...wiggle the alternator until it gives you the slack you need to remove the belt, if you cant get the slack, you can wrap your fingers around the belt upper and lower and squeeze, this will give lots of leverage and force alternator to move in, then pop that belt off and discard.

Now just put the alternator belt back on, use prybar to get proper tension...and tighten. A half inch of play is about the right tension...but tighter is good with a new belt since it will stratch a bit over time.

Make sure all 3 bolts are tight on alternator then move to replace power steering pump belt, but you will have to put at least onee of the top bolts back on to pivot against when using prybar to tighten that belt, then once you have the tension you want, tighten adjustment bolt, then keep the tension and put 3rd bolt in and tighten, make sure all are tight and you have 1/2 inch play on that belt as well. Then put all the other things back together ...check to make sure all tools are out from engine compartment and fire it up, if it squeels, it's too loose, if not, you're good and you can wipe down your tools, put them away and use the GoJo:)

Good Luck!

Jan 08, 2009 | 1984 Mercedes-Benz Mercedes Benz 300 Class

2 Answers

1990 nissan 300zx nonturbo - change alternator belt how?

If you look at the front of the alternator, behind the belt, you'll see a curving grooved metal track - that's the adjuster track for the alternator. There's a bolt going through the groove into the alternator, which holds the alternator in place. You need to loosen that. I believe it's a 14mm bolt. You may also need to loosen a couple of the 12mm bolts that mount either the bracket or the alternator, to allow it to move. You'll probably find that it's easier to cut the old belt off (so it's out of the way) and then do the bolt work with a little more room to spare. Belt changes are always a pain on these cars - stick with it even if it takes awhile. If that doesn't get the alternator loose, loosen or remove other bolts on the alternator mount or on the track mount, and it will move eventually - not much, but it'll move. You may find that you can partially seat the belt on the alternator pulley, but can't get the belt fully onto the pulley. If that's the case, get it as far on as you can, and then put a 27mm socket on a long breaker bar, put the socket on the crank pulley bolt, and with the car in neutral, rotate the crank pulley by hand. This will pull the belt onto the alternator pulley.

Sep 26, 2008 | 1990 Nissan 300ZX

1 Answer


Just did mine today.....Jack up the front as high as possible, remove front passenger wheel, put jackstands under car so it doesn't come down on you, remove the plastic inside fender well by taking out the 2 bolts and 3 plastic toggles, you need to remove the alternator belt to get to the power steering belt so loosen the center nut on the idler pulley/tensioner and then loosen the idler using the bottom nut/bolt to take the tension off the belt, remove the alternator belt first drawing a picture of how the belt is routed on all the pulleys for reassembly. Now loosen the 2 face nuts/bolts on the power steering belt idler pulley/tensioner and then use the nut/bolt on it's bottom to take the tesion off the belt and then remove the belt. Reinstall the belt and reverse everything to get it back together. Put on a new alternator belt on while your at it.

Jul 22, 2008 | 2001 Mitsubishi Diamante

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