School Bus Conversion Resources

School Bus Conversion Resources (http://www.skoolie.net/forums/)
-   Cummins Drivetrain (http://www.skoolie.net/forums/f39/)
-   -   Broken Leaf in Stack - new leaf or new stack? (http://www.skoolie.net/forums/f39/broken-leaf-in-stack-new-leaf-or-new-stack-18391.html)

upbeat 07-05-2017 11:53 AM

Broken Leaf in Stack - new leaf or new stack?
 
Hi All,

My 1974 Crown is currently in the shop to fix urgent issues and get it safe for family trips. Back wheels are off to do the rear brakes and we found a broken leaf on right side.

Option a) fixt the one leaf.
- pull out the stack and have the spring shop make a new one
- I'm paying a mechanic for this work, so I'm trying to do minimum and save non-critical jobs for me later.

Option b) wait and swap both stacks with salvaged parts.
- leave it as is and wait until I have time to salvage a whole new stack and parts for both sides and then do it on my own time.
- concern is driving with a broken spring in the stack - we don't use it much, and it's lightly loaded when we do, so as long as it's not going to drop out on the road, considering driving as is until I have time to do both sides with salvaged parts.

Welcome your thoughts.

Thanks,

Adam

EastCoastCB 07-05-2017 11:54 AM

Hmmmm... Maybe its time to upgrade to air ride!?

Rusty 07-05-2017 12:00 PM

Suspension component broken in heavy vehicle carrying my family?

I'd fix it now. Some leaf springs are more critical than others , depends which it is. Longest one with eye is a keeper.

Why does he want to exchange both sets? Why did it break- how does rest of pack look?

How much is a new pair fabricated to your specs?

upbeat 07-05-2017 12:41 PM

Exchanging both sets was my idea.

I have little history on the bus, other than miles are 367k.

My thinking is if one leaf broke it's likely age/fatique, and there's no way to really know the condition of the rest of the stack, or the other side, but they're probably all relatively similar = old and tired.

If I pay to custom make/bend a replacement leaf (their current proposal) what's to say the other side isn't ready to crack somewhere too.

They're thinking probably $500 to replace a single leaf.

I haven't yet found numbers for a new spring, but I understand part of benefits of Crown is compatible with class 8 parts. I was hoping that meant I might find a stock leaf spring that would work.

upbeat 07-05-2017 12:42 PM

Can delay big family trips until everything is squared away. I'm prioritizing best use of money to make best possible restored vehicle. Usually that means not being in a rush, so I'm relatively patient on this one if there's a better way than custom individual leafs.

Rusty 07-05-2017 03:31 PM

Quote:

Originally Posted by upbeat (Post 212888)
I'm prioritizing best use of money to make best possible restored vehicle.

I hear you, for sure.

I understand your concern for the remaining springs- you don't know what event caused the failure or the condition of the remainders. Same issue with salvage springs.

Best bet would be to take some accurate measurements- calipers help here. Start calling around like you do this every day-have your lingo and specs ready as most shops aren't real patient. Be wary of the price too good to be true.

Here is link about measuring

Tango 07-05-2017 03:38 PM

Check with Eaton Detroit. Been around forever and have or can fab springs for darn near anything at a reasonable price.

A stack that approaching 50 years old in a rig that size is probably due for replacement.

Kubla 07-05-2017 04:42 PM

If you are near a city of any size, there will be a spring shop that can fix the pack or make a new one

Stu & Filo. T 07-08-2017 06:09 PM

Quote:

Originally Posted by upbeat (Post 212886)
Exchanging both sets was my idea.

I have little history on the bus, other than miles are 367k.

My thinking is if one leaf broke it's likely age/fatique, and there's no way to really know the condition of the rest of the stack, or the other side, but they're probably all relatively similar = old and tired.

If I pay to custom make/bend a replacement leaf (their current proposal) what's to say the other side isn't ready to crack somewhere too.
.

I Built a trailer & put brand new spring packs on & first trip out broke a spring, Also broke a spring on a Semi once & other springs where fine I wouldn't go thru the expense off changing both spring packs, Also there's a shop in Dixon,CA that makes single or spring packs to order, they seemed reasonable to me when I used them.

Iceni John 07-08-2017 11:26 PM

You should check if you have the same number of leafs (leaves?) on each side. My Crown has one more leaf on the left side rear because the two 8D start batteries were on that side, so Crown balanced their 330 pounds weight by making the left spring slightly stiffer and slightly thicker. Will you have an equal weight on each side, or will you have more weight on one side or the other? This may affect what you do now to deal with the broken leaf.

My issue is that I will eventually have about 800 pounds more weight on the right side, because the eight house batteries, the two Group 31 start batteries and the generator are all on the right. As a result of this unavoidable weight imbalance and the different springs, my bus now sits about 1.5" lower on the right. I plan on making some simple brackets that will sit next to the frame rails above the rear axle, and each bracket will hold two 4.5"-diameter air bags bearing down on the top of the axle's spring clamps. This should be sufficient to level the bus with less than 100 PSI. If the bus leaned to the left I wouldn't bother doing anything, but road camber makes the right lean seem worse than it is.

John

cowlitzcoach 07-09-2017 01:20 AM

If it was me, I would check the rest of the springs in the pack to make sure none of the others were broken or getting ready to break.

And then I would pull the broken spring out and put it back together without it. I doubt you will miss it any time soon.

Eventually you will need to think about new springs or going air ride. But short term you will never need the support that one leaf would carry since you won't be loading any weight inside.

cadillackid 07-09-2017 08:08 AM

ive always looked at air ride as a means for height adjustment and sort of 'shocks' wit hthe stock shocks.. however is there a way to determine whether i should just my air ride 'down' or not since my bus is obviously lighter than it would be with a load of kids on it?
-Christopher


All times are GMT -5. The time now is 10:32 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.