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Old 07-06-2008, 09:28 AM
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Small Block Flywheel

How in the world do I get the flywheel off of my engine. I have a 350 (5.7) in my boat that I removed, pulled the bell housing and trans, but how in the world do I remove the flywheen from the main shaft? The obvious other question then - is how do I reinstall it later too?

thanks for any help!!!

MDB.............................
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Old 07-06-2008, 09:34 AM
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You should be able to, just undo the bolts and pull it off.
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Old 07-06-2008, 01:03 PM
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Sometimes they will be stuck due to rust, plus they are a "lite-tite" fit-almost a press fit. You may have to get out the BFH, I'd use a deadblow or a lead hammer. Sometimes a couple of crowbars will help, just got to get creative, once the bolts are out it is just stuck.
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Old 07-06-2008, 03:53 PM
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You probably need to dress the hub of the crankshaft with a little emery cloth. The wet environment almost always causes rust there and it won't let the flywheel come off.

But a deadblow hammer or a rubber mallet... or a steel mallet with a block of wood will all work. Otherwise, it should go on as easily as a wheel on a car. After you reinstall it, paint over the hub to prevent rust reforming on the hub of the crankshaft. To get it off again, its easier to pull paint off than to get rust off.
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Old 07-06-2008, 11:53 PM
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Remove bolts with impact wrench.

Drive locating dowel out of crankshaft towards engine all the way out of the flywheel, the dowel is located in between the bolts. Make sure you rotate the engine over by hand until the dowel is in a location where you can drive it all the way out and not hit the engine casting, there is a spot right above the oil pan flange where the casting is relieved for this.

Using a small hand sledge hammer, tap around the face of the flywheel until it loosens, sometimes having someone pry between the flywheel and the engine with a hammer handle will help wobble it off.

Be prepared for when it comes off because its heavy, you don't want the ring gear to hit the ground and break off some teeth. Its good practice to chain the flywheel to the engine bellhousing mounting flange because when it finally pops loose it will come off in a hurry.

Some flywheels on boat engines have short tapers on the crank face and sometimes a tap on the bolts before you pull them out will help loosen the rusty interface between the taper face and flywheel.

On install, wirebrush the rust off the mating flanges and install flywheel dry, drive locating dowel back in with bolts tightened loosely but bottomed, put antiseize on the bolt threads and torque to spec.

Hope this helps.
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Old 07-13-2008, 02:14 PM
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Flywheel help

Thanks for the info. I did get it off - the bolts were covered by the some sort of other plate (3 bolts). I got that off then all the flywheel bolts - and off it came. Related, the round part that the wheel bolts to on the engine - is different on the one I'm taking it off of compared to the 350 I want to put it back on to. Different pattern - but both are 350 5.7L of the same vintage, Any thioughts on this??? I'm baffled.

thanks much

MDB.............................
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Old 07-13-2008, 03:34 PM
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What year are the two engines?, in the mid-eighties one year can make all the difference, 2-piece to 1-piece rear main seal design change makes rear of crank different in size, shape and bolt pattern.
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