The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-26-2014, 09:36 AM   #1
84GMC15tepside
Registered User
 
84GMC15tepside's Avatar
 
Join Date: Sep 2012
Location: Oakland County, MI
Posts: 138
NP440/A833 Pressure Plate, Help Please!

Hey guys,

I've been putting my 350 engine together and getting ready to drop it in the truck. Currently, I am putting on the flywheel, clutch and pressure plate so I can then mount the NP440 to the engine and then drop it all in the truck. I got my original flywheel resurfaced, and I got the clutch on and pressure plate mounted. While using a clutch alignment tool, I evenly bolted down the 6 pressure plate bolts in a star pattern. The bolts are shoulder bolts and have lock washers on them (The shoulder bolts and lock washers look original to the truck). Being shoulder bolts, the shoulder is supposed to stop the bolt from going in the provisioned flywheel holes once the shoulder hits the flywheel... but probably because it's the original flywheel, the shoulder continues to go in the flywheel holes when tightening down some of the bolts...

1. I don't think so (because of the shoulder bolts), but should the pressure plate be flat against the flywheel?

2. I assumed not to the above question... So I used a flat washer off my work bench as a thickness gauge. I tightened down one of the bolts until the shoulder hit the flywheel and I stuck the flat washer between the flywheel and P.P. while tightening the bolt until the flat washer was almost stuck. I yanked the flat washer out and went to the next bolt (in a star pattern)... until all 6 bolts were tightened down and the distance between the P.P. and flywheel at each bolt were the thickness of the flat washer. Is this an OK method to use? (By doing this the pressure plate is an even distance from the flywheel all around, and the lock washers should hold the bolts in place)


Sorry for the long thread, I'm just trying to make it as clear as possible!
__________________
MY6 Stepside

Last edited by 84GMC15tepside; 08-26-2014 at 09:51 AM.
84GMC15tepside is offline   Reply With Quote
Old 08-26-2014, 02:22 PM   #2
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
Re: NP440/A833 Pressure Plate, Help Please!

THe pp needs to be bolted down flush to the flywheel. No spacers or washers.
Do yours look like these in the link.
http://www.jegs.com/i/McLeod/673/150...ductId=1713332
geezer#99 is offline   Reply With Quote
Old 08-26-2014, 09:10 PM   #3
84GMC15tepside
Registered User
 
84GMC15tepside's Avatar
 
Join Date: Sep 2012
Location: Oakland County, MI
Posts: 138
Re: NP440/A833 Pressure Plate, Help Please!

Quote:
Originally Posted by geezer#99 View Post
THe pp needs to be bolted down flush to the flywheel. No spacers or washers.
Do yours look like these in the link.
http://www.jegs.com/i/McLeod/673/150...ductId=1713332
Yes they do look exactly like that... This is what I was doing before with the flat washer.

Name:  IMG_20140826_103443014.jpg
Views: 101
Size:  30.4 KB

But I ended up talking to some experienced guys from town and they said the same thing, for the PP to be flush against the flywheel. I took off the PP and clutch to examine the flywheel bolt holes more closely. It ends up that the threads in the flywheel holes don't start until approximately a quarter of the way thru the flywheel... basically the length of the shoulder. So I mounted everything back together and made it flush...

I got some help from a couple buddies and we attached the tranny and put it all in the truck!

Name:  IMG_20140826_165440504.jpg
Views: 106
Size:  42.9 KB

Name:  IMG_20140826_184635660.jpg
Views: 101
Size:  45.9 KB
__________________
MY6 Stepside
84GMC15tepside is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:24 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com