1995 ford f150 4.9L my fan belt keeps falling off being pulled into the engine block even though i have replaced the belt, power steering pump + pulley and tensioner also the fan clutch. It isnt right away it happens after about 20mins of driving. ???
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Re: fan belt wont stay on 95 ford f150
You must have one pulley out of alignment, or else one of the pulleys you replaced doesn't have as many ribs as your belt, or you are getting it on crooked, or not the right way. Make sure you have ribs to ribs, and flat to flat.
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Most modern vehicles using an electric cooling fan have a thermostatic switch that will allow them to run even after the engine is turned off.
Start and stop driving can cause heat buildup in the block which can cause problems such as the one you have and if the fan isn't bringing the excessive heat down during a stop, the hot engine can refuse to idle or accept fuel as it should.
You should listen to see if the fan is turning on after the ignition is off; this is sometimes delayed for a minute or so until the thermostatic switch adjusts to the rising block temperature and starts the fan.
If the main fan is belt-driven, it may be the AC fan that is used for this purpose.
Engine temp sensor has gone bad, thinks the engine is hot even with the ignition off. open the engine compartment fuse panel and remove the fuse for the fan so you dont run your battery down while you park it, put it back in to drive though, just till you get the new sensor.
i'm going to keep answering this question, even though every time i do, the person give me a bad review. The diagram for the serpentine belt is either under the hood or on the front crossmember of the engine bay.
Is it getting the correct tension on the belt. Is the belt tension spring broke. Make sure you have the right belt. On the 1.9 engine they changed it in 1992 from a square tooth belt to a round tooth belt or the other way around. I'm not sure. Just make sure the teeth on the gears is the same as the belt. I know you said it was a 1994 but do you know if a previous owned changed the motor?
If you've never replaced the timing belt or chain,That would be my first thing I'd check is the Timing belt or chai, just aline the timing marks on crankshaft and then look at the position on the distributor to see if it's pointed in the #1 firing position .