Input needed on flywheel damage.

[yamanube]

Need some input on this wheel. It looks like it sheared a key and did some damage to the taper and keyway. Is it useable? Any advice? Its a Riva charging wheel.
(sorry the pics are bad, it was tough to get good shots but these are the best ones and give a fairly good idea of what is going on)

 

[#ZERO]

If that's an aluminum 62T flywheel, it will make a nice looking paper weight.

 

[WFO Speedracer]

Okay here is the deal,the key does nothing except locate the flywheel in position while you tighten it down,the taper on the other hand is what holds the flywheel on ,not the flywheel bolt,that looks usable but you need to lap the flywheel onto the taper with lapping compound ,that can be done in the boat but would be easier if you just removed the engine.

 

[yamanube]

If that's an aluminum 62T flywheel, it will make a nice looking paper weight.

So if it is an aluminum 61x flywheel it will be fine :slap:

Okay here is the deal,the key does nothing except locate the flywheel in position while you tighten it down,the taper on the other hand is what holds the flywheel on .not the flywheel bolt.that loose usable but you need to lap the flywheel onto the taper with lapping compound ,that can be done in the boat but would be easier if you just removed the engine.

The keyway damage doesn't worry me as much as the taper damage.

 

[WFO Speedracer]

My advice is lap it and see what it looks like,if it looks ok put it back on ,put some red locktite on the taper and bolt it down torquing it down to 70 ft lbs,at that point either it works or it dosen't nothing lost but time either way.Be aware that the flywheel will have to be heated to take it back off,the red locktite is serious business.

 

[Waternut]

In the event I run into this one day... What does "lap it" mean?

 

[JonnyB]

In the event I run into this one day... What does "lap it" mean?

Lap it referrers to valve lapping compound.

 

[WFO Speedracer]

Ok for the zillionth time here you take some valve lapping compound that you can get at any decent auto parts house and put some on the flywheel taper,then you put the flywheel on without the key.Now holding the crankshaft so it cannot turn you apply pressure to the flywheel and twist it with a back and forth motion thus lapping the two parts together to acheive a perfect fit.

 

[SXIPro]

Ok for the zillionth time here you take some valve lapping compound that you can get at any decent auto parts house and put some on the flywheel taper,then you put the flywheel on without the key.Now holding the crankshaft so it cannot turn you apply pressure to the flywheel and twist it with a back and forth motion thus lapping the two parts together to acheive a perfect fit.

You just saved a bunch of people from calloused tongue syndrome.

 

[WFO Speedracer]

You just saved a bunch of people from calloused tongue syndrome.

I feared as much lol

 

[Big Kahuna]

Does the flywheel have a steel hub or is is solid alum? If solid and you lap it, you will remove material from the flywheel causing it to sit farther in and possibly causing it to rub the pickups on the stator.

I speak from experience............ Dooohhh

 

[Scorn800]

I wouldn't run that.

 

[yamanube]

Does the flywheel have a steel hub or is is solid alum? If solid and you lap it, you will remove material from the flywheel causing it to sit farther in and possibly causing it to rub the pickups on the stator.

I speak from experience............ Dooohhh

BK that was my fear of lapping it to much, it is an aluminum hub. Also I am not sure that lapping it will offer much advantage, the taper itself other than the chunk that was taken out seems to be in decent shape so probably 90% of the mating surface is (maybe) adequate my worry was if 90% is enough or if it is just a paperweight.

 

[WFO Speedracer]

Well Scorn we have already determined that he jacked the crank up pulling the flywheel off so why not,there is only one more component in there and its cheaper than a flywheel or a crankshaft,I say go for it,worst you can do is make it a clean sweep .

 

[Big Kahuna]

Install it, and test it, if the motor is shaking more than normal, you got problems. But do not lap it. The only ones you lap are the steel hubbed kind. OEM or AM.

 

[yamanube]

Well Scorn we have already determined that he jacked the crank up pulling the flywheel off so why not,there is only one more component in there and its cheaper than a flywheel or a crankshaft,I say go for it,worst you can do is make it a clean sweep .

Crank is good, how about some usefull input.

 

[WFO Speedracer]

I see no problem with lapping it slightly,you can take a magic marker and paint the inside of the flywheel,wherever the magic marker is left after lapping is where it is not touching the taper,at least that way you know exactly what you are dealing with.LAPPING has been done on aluminum flywheels for a long long time ,I wouldn't get carried away though.

 

[yamanube]

I see no problem with lapping it slightly,you can take a magic marker and paint the inside of the flywheel,wherever the magic marker is left after lapping is where it is not touching the taper,at least that way you know exactly what you are dealing with.LAPPING has been done on aluminum flywheels for a long long time ,I wouldn't get carried away though.

Say I do lap it, that works fine, it cleans up the wheel and still clears the stator the large chunk will still be there. My worry is even with the rest of the surface perfect, will it be enough? Im not saying, will it be enough for a little while or run it and see what happens I want it to be 100% reliable, it is looking like that is not the case however.

 

[WFO Speedracer]

Truefully it was not 100% to start with or it would not have sheared the key off,aluminum flywheels are very tricky sometimes,the procedure is usually to install the flywheel,run it a few times then pull the front cover and retorque it,some of the aluminum flywheels did have problems and required lapping to seat correctly on the taper.The reason I suggested the magic marker was as an indicator ,it gives you a visual cue to how much of the flywheel is actually seating on the taper properly,if you lap it and all of the magic marker is gone ,you can pretty much assume it will seat correctly.As for being 100% reliable it is an aftermarket part attached to a watercraft 100% reliability therefore is not a possibility.

 

[yamanube]

By 100% reliability I was referring to 100% reliability of the wheel before the damage.