Restoring Rusty

[Gregski]

Originally Posted by greg64

Greg, what goes on that stub on the pedal is a big tension spring. What it does is hold the pedal in the fully up position, so the the weight of the pedal doesn't cause the throwout bearing to constantly ride against the clutch fingers. But it also increases the pressure to disengage the clutch a bit. The throwout bearings weren't intended to spin constantly when our trucks were made. But I think most modern throwout bearings actually do spin all the time.

Thanks whish I had a pic, cause even LMC Truck fails me in this regard, I believe their clutch pedal diagram shows more of a G Model than the C-K

[greg64]

Greg, I found the following picture that kinda shows what's going on:
http://s181.photobucket.com/user/Die...ts013.jpg.html
It's a 72, but the basic idea is the same. Sort of an over-center design.

It may be that those springs on your z-bar effectively serve the same purpose.

[Gregski]

[quote=greg64;7059038]Greg, I found the following picture that kinda shows what's going on:
http://s181.photobucket.com/user/Die...ts013.jpg.html
It's a 72, but the basic idea is the same. Sort of an over-center design.

thank you so much

Originally Posted by greg64

It may be that those springs on your z-bar effectively serve the same purpose.

I thought the same thing too, perhaps GM was reusing common parts, and just grabbed a pedal they already had

... and I don't mean to be a Drama Queen, but I just like doing things right and in order to put this linkage together properly I would like to know what I am missing and where it goes, capish?

[Titomars]

Originally Posted by greg64

Greg, I found the following picture that kinda shows what's going on:
http://s181.photobucket.com/user/Die...ts013.jpg.html
It's a 72, but the basic idea is the same. Sort of an over-center design.

It may be that those springs on your z-bar effectively serve the same purpose.

No it is called an over-center spring. it is a big garage door looking spring. the other mount point is high up on the pedal support. the mount point on the pedal support looks just like the pedal one. you will see it with a light and you looking up under the dash. It does not add effort to the pedal feel. What it does is pulls the clutch pedal and linkage back to unload the throwout brg. completely. if it were there and you did not have the pedal hooked up to the clutch it would hold the pedal in the "up" position till you depress the pedal about 1/2 inch then it would send the pedal to the floor with a nice bang. You need it or you will wear out throwout brearings.
Warning this spring is one very strong spring they are a real pain to deal with. Hook the top first then use a brake tool to "stretch" it over the pedal pin. It's a bit easier if you have the pedal on the floor.

[Gregski]

Originally Posted by Titomars

No it is called an over-center spring. it is a big garage door looking spring.

Might could this be it? Found it in the bed of the truck when I bought it, thought to my self what's this garage spring doing here, and tossed it in the spare truck parts bin, LOL

[Titomars]

Originally Posted by Gregski

Might could this be it? Found it in the bed of the truck when I bought it, thought to my self what's this garage spring doing here, and tossed it in the spare truck parts bin, LOL

yup that looks like it. the coil part is about 1 1/4 to 1 1/2 inches in diameter heavy gauge wire almost 1/4 inch in diameter. That is a common failure too

[rich weyand]

Hey, Gregski:

I found these in my PDF illustrated parts book, clipped the pages out and uploaded them to my site for you. Download them so I don't need to leave them on my site forever. I can also look up part numbers for specific parts if you need it. Sometimes the best way to find a part is just google the GM part number.

http://users.rcn.com/weyand/smalls/7...utchPedals.pdf

http://users.rcn.com/weyand/smalls/73-78Clutch.pdf

You might also want to purchase the CDs of the parts books. I copied the CDs to my machine, and can scroll the whole book.

http://horn-relay.dvautoparts.com/di...s-s-tiixsn8agk

[Chaplain]

You guys never give up. Good job...discussion, ideas, shared e-documents and scavenger search for old parts as well as assembly of new parts. Oh and all that with miles between us all.

[Gregski]

Originally Posted by Chaplain

You guys never give up. Good job...discussion, ideas, shared e-documents and scavenger search for old parts as well as assembly of new parts. Oh and all that with miles between us all.

It's how we do!

[Gregski]

you guys didn't think I was just eatin' and sleepin' the last few days did you?

here is the brake pedal, original, wire brushed, acid dipped, and finally painted

[Gregski]

a better man would have separated these two pieces, taken the clutch pedal completely apart, but hey "IT'S A TRUCK!!!"

first pic - original custom Rust Patina

second pic - after using a 4" angle grinder with a wire brush

third pic - brushed on some Phosphoric acid to get into nooks and cranies

fourth pic - not drying paint inside the house on our beautiful hardwood floor, honey

[Gregski]

with all the pedals and linkage bits drying it was time to move on to the transmission

first we used the "skateboard" as my daughter calls it to relocate it to the triage facility

[rusty76]

I sure am learning a lot here today.!

[Gregski]

took off the rubber padded bracket that holds the transmission to the cross member, in order to clean both pieces more better

making a mental note that it goes back on there a certain way, seems like it sits closer to the passenger side as it is a bit off center by design

[Gregski]

as I was knee deep in operation code name "SM465" I recalled that when I drained the juice out of this iron mellon and shoved my finger in the drain hole I felt some shrapnal

that's it I thought, to take this beast out and not take a peak inside that would be criminal

so out came the shifter so I could shove it half way into reverse, that is the open sesami for taking the lid off

[Gregski]

to be honest with you all, I removed the top case off the transmission because I was skierd to take off the sides, you see I looked at so many transmission pics and diagrams, somewhere along the way I got confused into thinking the sides are attached to linkages and rods and clips that when undone I would never git back into place

I am happy to find out that is not the case and that the side panels are just for inspection / cleaning if you will

and let me tell you this transmission is as simple as it gets, and very well put together, simple and strong

but as I went to remove the second side cover, that's when she drew blood, hmm maybe I'll dub this the Busted Knuckles Garage

[Titomars]

Originally Posted by Gregski

but as I went to remove the second side cover, that's when she drew blood, hmm maybe I'll dub this the Busted Knuckles Garage

Damn she bit you! I guess you need to train that trans to play nice

[greg64]

The old knuckle buster, eh? I tend to wear gloves doing jobs like that these days, I'm tired of cutting up my hands. That and my wife laughs at me when I need yet-another bandaid.

Those side covers are for PTO. The 465 has them on both sides, whereas the earlier SM420 only had a PTO port on one side.

As you can see, the gearing is pretty brawny. The straight cut gear is first. I have the same transmission in my 77. Sure, it shifts like a truck tranny, but I like it.

[Gregski]

Originally Posted by greg64

those side covers are for pto. The 465 has them on both sides, whereas the earlier sm420 only had a pto port on one side.

pto - ?

[jetmech85]

"Power Take Off" An assortment of devices could be driven from a gear box that bolts to the side transmission. A mechanical winch or a hydraulic pump for a dump bed for example.

[Gregski]

Originally Posted by jetmech85

"Power Take Off" An assortment of devices could be driven from a gear box that bolts to the side transmission. A mechanical winch or a hydraulic pump for a dump bed for example.

Thank you, I did not know that, learned another thing, cool.

[rusty76]

Just a little love bite.

[Gregski]

in case some of you didn't know what's inside those universal joint ends, I took one cup off to see them roller bearings for myself

top tip is to put tape around them when off the vehicle so they don't slip off on their own

I will be replacing mine with brand new ones, so I am not too worried

[Gregski]

since the transmission gaskets had to be special ordered and won't arrive till Tuesday, I had to change gears (see what I did there, LOL) and move on to something else to keep The Greg busy

so working our way from the front of the truck to the back, and having cleaned and semi assembled the clutch, and torn appart the tranny, the Drive Shaft was next

so the wire wheeling gets under way...

[Gregski]

so after transfering all the rust and dust off of the driveshaft on to me, I gave it a little acid wipe (that's what discolored it a bit, heck it might have even been flash rust) and then it was time to POR it on

last pic not too good, cause of shadows and the sun, but I wasn't gonna pick up a wet piece just to move it in the shade for a pic