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What does a bad flywheel sound like???
Posted by: rlp11 ()
Date: November 02, 2017 06:24PM

Got my free motor running. But it has a weird sound at the back end (front) of the motor. Sounds like a quite lifter click only at idle. No sound from higher rpm.

Roger Parent
El Cajon, CA
1964 Monza Driver
1964 Monza Project

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Re: What does a bad flywheel sound like???
Posted by: davemotohead ()
Date: November 02, 2017 06:28PM

Sounds like a ball peen hammer hitting the bell housing when they get really bad, push in the clutch and see if it goes away?





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Re: What does a bad flywheel sound like???
Posted by: jjohnsonjo ()
Date: November 02, 2017 06:41PM

Like Dave said if it goes away with the clutch pushed in its the flywheel.

IF NOT:

How many miles are on the engine. With a lot of miles, the cam gears wear in relation to the double lobes. Sometimes the cam makes a noise.

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Edited 1 time(s). Last edit at 11/02/2017 07:13PM by MattNall.

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Re: What does a bad flywheel sound like???
Posted by: rlp11 ()
Date: November 02, 2017 09:19PM

Motor is on a test stand. Motor was given to me. No history at all but he said it did run. I think tomorrow I will take it off the stand and remove the flywheel.

Roger Parent
El Cajon, CA
1964 Monza Driver
1964 Monza Project

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Re: What does a bad flywheel sound like???
Posted by: flat_six ()
Date: November 02, 2017 09:33PM

It sounds like: THUD

Oh. wait - that's AFTER you pull it out and hit it with a hammer.

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Re: What does a bad flywheel sound like???
Posted by: MattNall ()
Date: November 02, 2017 09:47PM

Right!! If the flywheel rivets are tight... it will "Ring" when tapped with light metallic object.





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Re: What does a bad flywheel sound like???
Posted by: JimBrandberg ()
Date: November 03, 2017 03:53AM

Often the starter will sound funny. The flywheel gets out of round and it takes the pressure plate and ring gear with it. The starter sounds funny as the ring gear gets tighter and looser against it through a revolution.
I don't think it would sound like a lifter click at idle but I could be wrong.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: What does a bad flywheel sound like???
Posted by: corventure Dave ()
Date: November 03, 2017 08:28AM

At the Toss I had two flywheels out for people to do the ring test. One lose, one tight. I am amazed at how many people hit the flywheel face with the rubber hammer. One needs to hit the center plate that bolts to the crankshaft to get a true test.
many times a marginal flywheel will appear tight when only the face is tapped.

Corventure Dave

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Re: What does a bad flywheel sound like???
Posted by: flat_six ()
Date: November 03, 2017 08:45AM

corventure Dave Wrote:
-------------------------------------------------------
> At the Toss I had two flywheels out for people to
> do the ring test. One lose, one tight. I am amazed
> at how many people hit the flywheel face with the
> rubber hammer. One needs to hit the center plate
> that bolts to the crankshaft to get a true test.
> many times a marginal flywheel will appear tight
> when only the face is tapped.
>
> Corventure Dave

Awesome Dave! I never knew there was so much science behind hammer testing of a Corvair flywheel!

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Re: What does a bad flywheel sound like???
Posted by: Frank DuVal ()
Date: November 03, 2017 10:45AM

Ah, but doesn't that depend on how you are supporting the flywheel for the ring test?

For your testing method, do you hold the "face", the inner mounting plate, or loosely set the large hole on a finger?

I loosely set the large hole on a finger, not gripping it.

Frank DuVal

Fredericksburg, VA

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Re: What does a bad flywheel sound like???
Posted by: corventure Dave ()
Date: November 03, 2017 12:18PM

Stand-hold the flywheel up on it's edge, like a bench top. One hand on the top edge stabilizing it, the other hand, small rubber hammer tap the center plate.

Corventure Dave

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Re: What does a bad flywheel sound like???
Posted by: MattNall ()
Date: November 03, 2017 01:16PM

Interesting all the various ways to test!





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Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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