possible backwards clutch disk - The 1947 - Present Chevrolet & GMC Truck Message Board Network

olRed · 01-12-2012, 12:18 PM

just put a sm465 in my truck, with new flywheel and clutch assembly.Got it put back together and it won't go into gear with the engine running. I tried to pit it in gear and start it, the truck moved very slightly but sounds like the clutch was slipping badly.

from what I've searched, sounds like the disk is in backwards, my question is which is the correct direction for it to face? it didn't have any markings on it...in hindsight I should have paid more attention to how the old one came out....oh well, hope you guys can shed some light
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68gmsee · 01-12-2012, 01:10 PM

The protruding center part goes towards the pressure plate. Also check the installation of the fork on the throw out bearing. Spring clips should not be on top of lip. Both the fork extension and spring clip should be on the inside.

olRed · 01-12-2012, 01:18 PM

alright ill be sure to check that throwout too.....I'm pretty sure I got both pieces in the groove though
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*HEI451* · 01-12-2012, 01:32 PM

Just a question, how much free play in the c;lutch pedal do yu have? How far down does the pedal travel freely before you feel it start to release the clutch?

It may well just be an adjustment of the throw out linkage.

olRed · 01-12-2012, 01:53 PM

I tried to adjust it all the way out as far as it would go and same deal
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dznucks · 01-12-2012, 03:37 PM

Are you sure you have the right throwout bearing?

Also, the pivot ball for the clutch fork may be adjustable.

I ran into this problem long ago with my three speed. Thought I had the wrong throwout bearing, so i swapped it. Realized i had the right one so i swapped it back and realized i have to adjust the pivot ball forward.

olRed · 01-12-2012, 03:52 PM

ok, just got trans back out....one side of the clutch disk has just the very center (right around the splines) protuding and the opposite has the whole part inside the friction material sticking out.....right now the side with just the very center protuding is facing the pressure plate....backwards or no?
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**truckdude239** · 01-12-2012, 03:55 PM

can you post a picture of the sides?

olRed · 01-12-2012, 03:57 PM

no, I wish I could
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68gmsee · 01-12-2012, 04:28 PM

If the protruding center portion is facing the pressure plate and the flat side the flywheel the disc is in correctly. With the lower inspection plate off, see if you can have someone step on the clutch pedal and check that the disc is in fact releasing/disengaging from the flywheel.

With the pedal depressed disc should not turn if it still does, then either the pressure plate is defective (I had that problem before) or there is some other mechanical or adjustment problem. Check the throw-out bearing size as mentioned above.

If it in fact is being retracted properly then your tranny has a problem.

olRed · 01-12-2012, 04:49 PM

ok guys, after quick investigation I found that it was backwards....I can see where the flywheel bolts were hitting the springs in the disk, and even putting it up by hand you can tell the disk will only fit in the flywheel one way.....man I wish I would looked at that the 1st time.....I preciate the help yall
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68gmsee · 01-12-2012, 06:01 PM

Looks like your first instinct was correct. Glad you found the problem.

*HEI451* · 01-12-2012, 08:05 PM

Yes, glad you found it.

**Captainfab** · 01-13-2012, 01:43 AM

The hub of the clutch disc that includes the springs goes towards the pressure plate and trans.

01-12-2012, 12:18 PM	#1
olRed Registered User Join Date: Dec 2011 Location: Mt. Pleasant, NC Posts: 7	possible backwards clutch disk just put a sm465 in my truck, with new flywheel and clutch assembly.Got it put back together and it won't go into gear with the engine running. I tried to pit it in gear and start it, the truck moved very slightly but sounds like the clutch was slipping badly. from what I've searched, sounds like the disk is in backwards, my question is which is the correct direction for it to face? it didn't have any markings on it...in hindsight I should have paid more attention to how the old one came out....oh well, hope you guys can shed some light Posted via Mobile Device

01-12-2012, 01:10 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: possible backwards clutch disk The protruding center part goes towards the pressure plate. Also check the installation of the fork on the throw out bearing. Spring clips should not be on top of lip. Both the fork extension and spring clip should be on the inside.

01-12-2012, 01:18 PM	#3
olRed Registered User Join Date: Dec 2011 Location: Mt. Pleasant, NC Posts: 7	Re: possible backwards clutch disk alright ill be sure to check that throwout too.....I'm pretty sure I got both pieces in the groove though Posted via Mobile Device

01-12-2012, 01:32 PM	#4
HEI451 Account Suspended Join Date: Mar 2011 Location: Yerington, Nevada Posts: 864	Re: possible backwards clutch disk Just a question, how much free play in the c;lutch pedal do yu have? How far down does the pedal travel freely before you feel it start to release the clutch? It may well just be an adjustment of the throw out linkage.

01-12-2012, 01:53 PM	#5
olRed Registered User Join Date: Dec 2011 Location: Mt. Pleasant, NC Posts: 7	Re: possible backwards clutch disk I tried to adjust it all the way out as far as it would go and same deal Posted via Mobile Device

01-12-2012, 03:37 PM	#6
dznucks Registered User Join Date: Feb 2006 Location: Smyrna, Ga Posts: 1,647	Re: possible backwards clutch disk Are you sure you have the right throwout bearing? Also, the pivot ball for the clutch fork may be adjustable. I ran into this problem long ago with my three speed. Thought I had the wrong throwout bearing, so i swapped it. Realized i had the right one so i swapped it back and realized i have to adjust the pivot ball forward.

01-12-2012, 03:52 PM	#7
olRed Registered User Join Date: Dec 2011 Location: Mt. Pleasant, NC Posts: 7	Re: possible backwards clutch disk ok, just got trans back out....one side of the clutch disk has just the very center (right around the splines) protuding and the opposite has the whole part inside the friction material sticking out.....right now the side with just the very center protuding is facing the pressure plate....backwards or no? Posted via Mobile Device

01-12-2012, 03:55 PM	#8
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: possible backwards clutch disk can you post a picture of the sides? __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

01-12-2012, 03:57 PM	#9
olRed Registered User Join Date: Dec 2011 Location: Mt. Pleasant, NC Posts: 7	Re: possible backwards clutch disk no, I wish I could Posted via Mobile Device

01-12-2012, 04:28 PM	#10
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: possible backwards clutch disk If the protruding center portion is facing the pressure plate and the flat side the flywheel the disc is in correctly. With the lower inspection plate off, see if you can have someone step on the clutch pedal and check that the disc is in fact releasing/disengaging from the flywheel. With the pedal depressed disc should not turn if it still does, then either the pressure plate is defective (I had that problem before) or there is some other mechanical or adjustment problem. Check the throw-out bearing size as mentioned above. If it in fact is being retracted properly then your tranny has a problem. Last edited by 68gmsee; 01-12-2012 at 04:39 PM.

01-12-2012, 04:49 PM	#11
olRed Registered User Join Date: Dec 2011 Location: Mt. Pleasant, NC Posts: 7	Re: possible backwards clutch disk ok guys, after quick investigation I found that it was backwards....I can see where the flywheel bolts were hitting the springs in the disk, and even putting it up by hand you can tell the disk will only fit in the flywheel one way.....man I wish I would looked at that the 1st time.....I preciate the help yall Posted via Mobile Device

01-12-2012, 06:01 PM	#12
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: possible backwards clutch disk Looks like your first instinct was correct. Glad you found the problem.

01-12-2012, 08:05 PM	#13
HEI451 Account Suspended Join Date: Mar 2011 Location: Yerington, Nevada Posts: 864	Re: possible backwards clutch disk Yes, glad you found it.

01-13-2012, 01:43 AM	#14
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: possible backwards clutch disk The hub of the clutch disc that includes the springs goes towards the pressure plate and trans. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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