Flywheel check? - ZR-1 Net Registry Forums

Ccmano · 05-31-2010

I have a used (30k mile original) flywheel sitting in the garage. Does anyone know how to check and see if it is OK? Not sure if I'm keeping it or selling it, but want to be sure it's good.
H

Hammer · 05-31-2010

Hans,

Don't know the procedure, but I know it is in the FSM.

Ccmano · 06-01-2010

The FSM doesn't say much, just "check for excessive looseness" by moving the plates by hand. Seems to me I read somewhere there is a tolerance for how much movement there should be. X number of inches. Although, it looks like this one is OK. It only moves an inch or less and not real easily.
H

LGAFF · 06-01-2010

Install in car, rev to 7000K RPM and hold for 20 secs, repeat with clutch dump......exit vehicle, if you are as tall when you exit as you were when you entered the vehicle the flywheel is good. Sudden loss of blood is also an indicator of a bad DM flywheel.

Hammer · 06-01-2010

Quote:

Originally Posted by Ccmano

The FSM doesn't say much, just "check for excessive looseness" by moving the plates by hand. Seems to me I read somewhere there is a tolerance for how much movement there should be. X number of inches. Although, it looks like this one is OK. It only moves an inch or less and not real easily.
H

Hans,
Below excerpt is from the 1991 FSM, Page 7C-12. I am assuming your 90 manual should be the same. Distance should not be more than 1.378 inches. Hope this gives you more to go on.

FLYWHEEL LASH MEASUREMENT
Figure 12

Remove or Disconnect
1. Clutch cover assembly and clutch disc, refer to clutch cover assembly and clutch disc in this section.

Important
? It is normal to rotate the primary flywheel against the secondary flywheel for a limited
distance by hand.
? This is called looseness of the dual mass flywheel.
? This looseness does not impair the function of the flywheel unless it exceeds the specifications listed below under "Measure" which may indicate internal damage.
? Dual mass flywheel will produce a clacking noise if engine has rough idle. Before replacing flywheel for noise complaint, engine should be checked for misfiring or rough operation at idle.

Measure
? For excessive looseness of dual mass flywheel.
2. Install 2 bolts which were used to retain the pressure plate to flywheel across from each other in the secondary flywheel.
3. By hand using the bolts to help rotate the secondary flywheel against the primary flywheel
clockwise until all looseness is removed.
4. Release the flywheel and draw a mark on the secondary and primary flywheels.
5. Repeat Steps 3 and 4 only rotate the secondary flywheel counterclockwise.
6. Measure the distance between the two marks, if the measurement exceeds 35 mm (1.378 in.). Replace the flywheel assembly.

Hammer · 06-01-2010

One more note. When talking with marc about the flywheel in #458, he said they wear concave and the center to outside tolerance was .015" max.

LGAFF · 06-01-2010

http://www.klann-online.de/Englisch/...7e090536oP.pdf

Not a Z but

Good: http://www.youtube.com/watch?v=kIg3S_n5F4E&NR=1

Bad: http://www.youtube.com/watch?v=bFnLMQNKKH8&NR=1

Ccmano · 06-02-2010

Quote:

Originally Posted by Hammer

Hans,
Below excerpt is from the 1991 FSM, Page 7C-12. I am assuming your 90 manual should be the same. Distance should not be more than 1.378 inches. Hope this gives you more to go on.

FLYWHEEL LASH MEASUREMENT
Figure 12

Remove or Disconnect
1. Clutch cover assembly and clutch disc, refer to clutch cover assembly and clutch disc in this section.

Important
? It is normal to rotate the primary flywheel against the secondary flywheel for a limited
distance by hand.
? This is called looseness of the dual mass flywheel.
? This looseness does not impair the function of the flywheel unless it exceeds the specifications listed below under "Measure" which may indicate internal damage.
? Dual mass flywheel will produce a clacking noise if engine has rough idle. Before replacing flywheel for noise complaint, engine should be checked for misfiring or rough operation at idle.

Measure
? For excessive looseness of dual mass flywheel.
2. Install 2 bolts which were used to retain the pressure plate to flywheel across from each other in the secondary flywheel.
3. By hand using the bolts to help rotate the secondary flywheel against the primary flywheel
clockwise until all looseness is removed.
4. Release the flywheel and draw a mark on the secondary and primary flywheels.
5. Repeat Steps 3 and 4 only rotate the secondary flywheel counterclockwise.
6. Measure the distance between the two marks, if the measurement exceeds 35 mm (1.378 in.). Replace the flywheel assembly.

Now that's interesting, my 90' FSM says none of that, in the very same section. It's must have been added in 91'. Thanks a bunch.

Lee, the videos a perfect, looks like the flywheel I have on the bench is perfect.
H

05-31-2010	#1
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Flywheel check? I have a used (30k mile original) flywheel sitting in the garage. Does anyone know how to check and see if it is OK? Not sure if I'm keeping it or selling it, but want to be sure it's good. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

05-31-2010	#2
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,653	Re: Flywheel check? Hans, Don't know the procedure, but I know it is in the FSM. __________________ [I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I]

06-01-2010	#3
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Flywheel check? The FSM doesn't say much, just "check for excessive looseness" by moving the plates by hand. Seems to me I read somewhere there is a tolerance for how much movement there should be. X number of inches. Although, it looks like this one is OK. It only moves an inch or less and not real easily. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. Last edited by Ccmano; 06-01-2010 at 03:09 PM.

06-01-2010	#6
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,653	Re: Flywheel check? One more note. When talking with marc about the flywheel in #458, he said they wear concave and the center to outside tolerance was .015" max. __________________ [I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I]

06-01-2010	#7
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Flywheel check? http://www.klann-online.de/Englisch/...7e090536oP.pdf Not a Z but Good: http://www.youtube.com/watch?v=kIg3S_n5F4E&NR=1 Bad: http://www.youtube.com/watch?v=bFnLMQNKKH8&NR=1 __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 06-02-2010 at 12:03 AM.

06-01-2010	#4
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Flywheel check? Install in car, rev to 7000K RPM and hold for 20 secs, repeat with clutch dump......exit vehicle, if you are as tall when you exit as you were when you entered the vehicle the flywheel is good. Sudden loss of blood is also an indicator of a bad DM flywheel. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 06-01-2010 at 03:31 PM.

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