Do you have to take out the crankshaft to replace the main bearings?

How do you replace main bearing on 350?

Unfortunately, there is no simple way to replace main bearings.The main bearings support the crankshaft as the engine is running. Technically, the crankshaft is never supposed to be in contact with the bearing. As the engine runs it drives the oil pump which moves a relatively small amount of oil and is supposed to maintain about 30 to 60 PSI of oil pressure. The crankshaft "floats" on a film of pressurized oil and the crankshaft and bearings SHOULD never wear out if the oil pressure is maintained and if the oil is changed according to schedule.If/when the main bearing wears out the gap between the bearing and the crankshaft becomes great enough that a relatively large volume of pressurized oil leaks past the bearing and the pump will be unable to maintain the necessary pressure.So...To replace the main bearings you need to remove the crankshaft, and typically that means to pull the engine. While it is sometimes possible to pull the crankshaft while the engine is in place, usually the problems end up being far worse than just pulling the engine, and the potential for damaging other components is quite high.After the crankshaft is removed, examine the bearing surfaces. You'll find that worn bearings will be a different color than good bearings. As the babbitt surface wears through (it's only a couple thousandths of an inch thick) you get down to the copper (typically) surface.Any worn bearings, rod or main, should be replaced, and if you're replacing any rod bearings, replace them all; same with mains... but don't be in too big of a hurry just yet. Next, take the crankshaft to a machine shop and have them use a micrometer on each "journal" to make sure they are all "round" and within specifications. Journals that are worn can either be too small or worn out of round. In either case you need to make sure the surfaces are within specifications before re-assembling the engine.While the engine is apart, make sure you check the head for worn valves, and check the cylinders for wear. There's no point in reassembling a worn engine.Now for a little unsolicited advice: if the main bearings are worn you can often get many thousands of additional miles out of an engine by just switching to a heavier grade (thicker) oil. If you've been using 5W15, change to 10W30 or even 20W50. That single step can get you out of an expensive rebuild and keep the engine running for a long time.

How do you replace craftsman mower deck spindle bearings?

One can look in the owners manual of the Craftsman mower to learn how to replace the spindle bearings. Another way the spindle bearings can be replaced is to take it to a lawnmower professional.

How do you replace the front wheel bearings on a 2001 Ford F-250 4X4?

Take it to your local garage and they will replace it and you pay the bill

How do you replace the crankshaft sensor on a 99 ford windstar?

easy take old one off replace with new one! simples no

Remove wheel bearings?

The front bearings are pressed into the hub. Take the axles out of the hub and remove the steering knuckle/hub assembly. Take them to a machine shop and have the bearings pressed out and back in again. The rear bearings you just take off the grease cap. Unstake the keeper washer and take the nut off. Then you can pull the outer bearings out. then replace the nut on the spindle and pull out again which will take the inner bearing out along with the seal.

How do you do you replace mower deck bearings?

First you take the pulley and the blade off. You unbolt the plates holding the bearing in place. Take it apart. Take the bearings off and put new ones on and put back together again.

How do you replace the oil pump on a 89 suzuki sidekick?

How do I take the oil pan off The oil pump is on the front of the engine behind the main pulley on the Crankshaft, behind the timing belt. NOT in the Oil Pan.

How do you replace the crankshaft sensor on a 92 Honda accord?

take theone out and put in the new one. old

How do you replace rear wheel bearings on kawasaki mule 2510?

I have a 1997 mule 2510 You have to remove the whole rear end of it to replace the rear bearings because the bearings are inside the housing on the cv joint. The axle bolts in the rear diff with six bolts. you take the shocks and springs and all loose and drop the whole rear end and the and take the top part of the axle off the bottom half axle and then you will see the bearings

How do you replace the rear wheel bearings on a 1987 Cadillac Fleetwood Brougham 5.0?

They are pressed in the axle. Take it to a garage.

How do you replace the front wheel bearings in a 1990 loyale wagon?

you take off the hair and pink nails of the car

Do you have to take out the crankshaft to replace the main bearings?

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How do you change crankshaft bearings on a 1995 dodge ram 2500 series?