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how to fit alternator belt

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How to wire an alternator and starter?

Usualy there are 4 wires, one wire is from the casing which goes to the negative terminal of the battery, then out of the other 3 wires, one is the field wire which you should connect to positive but make sure you put a basic on off switch, turn switch on when starting alternator, turn off once running and leve off when not in use. the other two wires go to the positive terminal of batery, if …

How do you tighten the alternator belt?

Pull the alternator away from the engine until the belt is tight. You want to be able to press down on the belt at a mid point between two pulleys and only be able to move it downward about 1/8 to 1/4 inch. When you have the alternator in the right position, have an assistant tighten the top bolt and nut to lock the alternator in.

How do you remove and install an alternator?

Remove the main power cable from the alternator.The bolts will likely require standard sized sockets or wrenches in American made vehicles,and metric in most foreign applications.The only other cable running to the alternator connects to a harness,so it will be easy to identify.Set the bolt aside someplace safe until you install the new alternator.

How much does it cost to change the alternator?

Used alternators carry more risk, and realistically can either already have an issue, or go out at any minute. The cost of the three options typically ranges from about $300 to $500. The replacement itself should only take about 2-hours. Add this all together, and you have a total cost for an alternator replacement of between $480 to $940.

How to tell if alternator belt needs replacing?

A significant sign that your alternator or serpentine belt needs replacing is visible cracking along the belt . Modern serpentine belts are designed to prevent cracking and will last much longer than older accessory style belts, but all belts are prone to cracking over a long enough timeline.

How many belts does an alternator have?

Locate the alternator or serpentine belt. In older model vehicles, engines often came equipped with multiple belts that each powered a different accessory. However, most modern vehicles use only one belt to power the alternator as well as the power steering, air conditioning, and any other accessories.

How to tell if serpentine belt is worn?

You can purchase an inexpensive plastic belt gauge at most auto parts stores than can tell you if your belt needs to be replaced by measuring the depth of the grooves on the belt. Simply slide the gauge into one of the grooves and take note of how far it goes in.

How to tell if a belt is worn out?

Look for chunks of the belt missing in places, frayed fabric along the back of the belt, or signs that the belt has been rubbing on something.

What happens if a belt is dried out?

If the belt appears dried out and cracks have formed, it will need to be replaced.

Where to slide alternator belt?

If your vehicle has a belt only for the alternator, you will need to only slide it around the crank pulley at the bottom of the engine.

Where is the serpentine belt located?

Depending on the make and model of the vehicle, this belt (often called the serpentine belt) is often located on the front or side of the engine. Many American made vehicles with V6 engines or larger have the serpentine or accessory belts on the front.

How to put a belt on a pulley?

Making sure that it is installed properly and exactly the way it should be will prevent any damage to the car. Use the wrench to pull in the direction needed to loosen the tension and slip the belt in place and over the alternator pulley. Now, slowly release the tensioner, making sure to avoid any injury or damage. Remove the wrench.

How to remove alternator belt?

Releasing the tension on the belt will allow you to remove it. First you need to locate the tensioner pulley. The alternator belt can be wound around a number of different accessory pulleys, depending on the model and make of the car. The tensioner pulley is attached to a rotating metal bracket which can either bolt onto the car or engine block at the reverse end of the pulley. Use a wrench or ratchet that fits the rotating end of the bracket.

How to tell if alternator belt needs replacing?

You can check if alternator belt needs replacing by doing the following steps: Check the belt tension, if you push on the belt and it moves more than ¼ inch to a ½ inch then it means that it is worn out and needs replacing, now you can go on ahead and remove it.

How to check belt tension on a car?

Make sure that everything is placed the way it should be. Check the belt tension by pushing on it again; it shouldn’t have moved more than ¼ inch to ½ inch. Now you are good to go. Make sure that you get rid of all the rags and tools out of the engine area. You can now attach the negative battery cable and start your car.

How to know where alternator belt is attached?

Know how the alternator belt is attached and where it is attached exactly, you will need to know this when you put in the new alternator belt. Memorize every twist and turn the belt goes. It is imperative that you put in the new belt exactly the way the old one was put, or else it will not work properly. To be able to remember the exact way the belt is installed, you can either make a drawing of it or you can take a picture of it.

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What is the best way to relieve tension on a belt?

Relieve tension on the belt with the auto-tensioner (if equipped). Some vehicles use the alternator itself to apply tension to the serpentine or accessory belt, but others use an auto tensioner pulley.

How to disconnect a battery?

Disconnect the battery. Find the right socket to loosen the bolt that keeps the cable on the negative terminal tight. It’s the terminal of the battery with a visible (-) sign. Once it’s loose, slide the cable off the terminal to disconnect the battery. Never work in the engine bay of a vehicle without first disconnecting the battery for safety.

How to remove the main cable from the alternator?

Remove the main power cable from the alternator. The main power cable will be the thick cable attached to the alternator that runs from the battery. Depending on how much space you have in your specific vehicle, you may be able to use a ratchet, but in some, you may only be able to fit an open-ended wrench. Unscrew the bolt holding it in place and pull it from where it’s connected.

What does an alternator do?

The vehicle’s alternator supplies power to recharge the battery and operate its electronics. If your vehicle begins showing signs of reduced power like dimming headlights or interior lighting, you can have your alternator tested for free at most auto parts stores.

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Why disconnect negative battery cable?

Disconnect the negative battery cable before you work on any electrical parts in your vehicle to prevent shorting out the electrical system and damaging the electronics.

Where is the alternator located on a car?

Follow the serpentine or accessory belts to locate the alternator in your engine bay. Depending on the vehicle, it may be on the top closest to you, or it may be on one of the sides and difficult to access. If you can’t easily access it from the engine bay, you’ll need to jack up the vehicle.

What About Double-V Pulleys?

Double-V pulleys are pretty common and perform far better than a single-V pulley arrangement but they too can be more problematic than a multi-rib pulley system. If your vessel already has a double-v belt pulley system I would recommend using it, unless you desire more than 130A to 140A of alternator charging. Years ago, when industry used lots of v-belts, finding a * precision matched pair of belts was pretty easy (*Gates terminology), today, not so much. For the set up pictured below, Gates recommended their Aramid reinforced Predator Industrial Series belts but with limited sizing, in the industrial line, and the inability of the Predator series belts to wrap the alternator pulleys small outside diameter properly, the Gates XL Series was the next best choice.

How does an alternator work?

Internal fan alternators draw cool air in from both the front and rear of the alternator and expel it out the center. Front fan alternators draw air in through the rear and expel it out the front. Belt guards like this do nothing but make it more difficult to have a cool running alternator.

What is a small frame alternator?

Many marine engines, other than some large Cummins, Cats etc., generally ship with what is called a small frame alternator. Small frame alternators run the gamut in terms of build quality and durability but none of them are what could be considered “ constant duty “. The only way I know of getting a constant duty small-frame alternator is to remove the internal rectification and rectify remotely. This is what I have done on my own vessel for charging a large LiFePO4 battery bank.

Why is my alternator burning up?

Burned up alternators like you see below can happen due to a lack of alternator temp sensing/protection and/or a lack of being able to current limit the alternator. Compass Marine Inc. actually builds the identical alternator using the same internal components from the same manufacturer. We go a few steps further however and build the alternator with 400V 75A diodes. The manufacturer of the misleading claim above used only 200V 50A diodes. Despite the ability of our version to deliver significantly more power, and for longer, we would never, ever tell a customer the Compass Marine Inc., CMI-HD125-ER, is a continuous duty unit. That would be pure unadulterated BS.

How to check alternator alignment?

When on-board, alignment can be checked pretty easily by using a straight-edge. By clamping a known true straight-edge across the front face of the crank pulley, and extending it to the alternator and water pump pulleys we can easily check both angualr and parallel alignment. Parallel alignment is usually the more common issue but, alternator brackets made by the engines marinizer, such as on a Westerbeke or Universal, can tend to create angular issues more often than a factory made alternator mount such as a Yanmar.

What is the temperature of a marine alternator?

In other words, an alternators output rating is rated cold (73ºF to 83ºF) at 6000 shaft RPM and 13.5V. Simple stuff. While some marine alternator manufacturers, such as Balmar, provide both a cold (79ºF) and a hot rating (194ºF) this hot rating is still not a constant duty rating. The hot rating is simply telling you the expected drop in max achievable output, as the copper in the alternator heats up to 194ºF. A cool alternator simply produces more peak output than one at near 200ºF.

What is a hairpin?

The term hairpin refers to a stator design invented by the Japanese manufacturer Denso. The design places a lot of copper into a small space by using square magnet wire that can nest more tightly. Balmar uses this technology in its AT-165 and AT-200 series alternators.

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