Question about Oldsmobile Delta 88

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How do I release belt tension to replace alternator in 1988 Oldsmobile Delta 88

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It should be a 15mm or a 18mm nut or a 3/8 or it will be a 1/2 ratchet and you need to push it towards to fire wall to get the belt off. It is a tight tenson on it.

Posted on Aug 22, 2010

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Fuse diagram for delta Oldsmobile 88 royal brougham 1988


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Sounds like you are in the right area. There is a good chance that the belt is OK and just needs tightening. I'm not familiar with this model but I'm presuming that there is adjustment available (Usually the pump is mounted on bolts that you can loosen and then lever the pump out a little to tighten the belt.

That should cure the issue. Failing that, or if you have already tightened the belt, time for a new one I imagine.

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1988 Oldsmobile Delta 88 3.8 liter engine VIN "C"

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Hope helps (remember rated this).

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1 Answer

1988 Oldsmobile Delta 88' car stalls out. Coil pack might need to be replaced


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Changing alternator belt in 1977 Delta 88


On the older cars, the alternator was attached by two mounting bolts. The long bolt goes through the alternator and is held on by a hex nut. The short bolt goes through a slotted curved piece into the alternator and is used for adjusting tension on the belt.

Depending on the location of the alternator, it may require you to work from the top of the engine or in some cases from under the car. Determine if any other belt is blocking the alternator belt. If so, this belt will have to be removed first to access the alternator belt.

Use a little penetrating fluid (e.g. PB Blaster) on the threads of both bolts and let it soak in to loosen up any corrosion. Using two wrenches/sockets(one to hold and one to loosen), loosen the long pivot mounting bolt; but do not remove. Then use a wrench or socket to loosen the short bolt and push the alternator towards the engine to allow the belt to be removed.

Installation is the reverse. You will have to lift the alternator up and outward to tighten the belt prior to tightening the short bolt. Then tighten the long bolt. Check tension by pressing down on the midpoint along the longest span between pulleys. Belt should not deflect more than 1/2 to 3/4 inch. If it does, loosen the two bolts and re-tension (you may need a pry bar for adjustment). Some setups use an idler pulley for adjusting tension.

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