Shimming Governor springs - Interesting discovery

D

deerefanatic

Always learnin...
Joined
Aug 27, 2011
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As referenced in my tranny thread, I'm shimming my governor springs as my tranny likes to shift at around 2800 WOT and with stock springs, this sucks! LOL. So, I'm following the writeup that BlackSkyRacing put up.

First off, the pump has never been worked on.... The safety wire was still in place, and the AFC had never been touched either, so doing the springs from above. When I measured stud protrusion on the first spring, it was about .027 inches, or 1 click as it turns out. Now, this is vastly different from what Stan (BlackSkyRacing) says is normally seen (.050, or 5 clicks)

I'm thinking this may be why my truck has always had a chronicly low idle speed, and is very, very easy to stall. I always blamed the stalling on advanced timing, maybe not? Also, truck does not start well unless you pedal the accelerator.

Anybody else seen this on a stock truck that's never been messed with?
 
I would blame your low idle and need for pedal on start-up due to your idle being set low. Adjust it up some.

Stud protrusion is going to vary from pump to pump. IIRC, my 12v was around .080" or so. Never measured it on my 24v. Preload is whats going to determine its characteristics. Stud protrusion is a good measurement for setting it to the same spec it came out at, nothing more.
 
Normally, looser springs make for a more stable idle. Id also go with tate in saying you just need to raise your idle some.

I have been there and done that with the shifting. With the stock GSK my truck wouldnt pull far enough to shift at WOT without defueling first. The GSK completely takes care of that and makes the truck 100% more fun to drive.
 
Cummins Driver said:
Hey, 24 valves dont have governor springs :lolly:
Click to expand...

They do when they're p-pumped!! LOL

OK, got the springs installed, 5 clicks on each spring. Cranked the idle up. Hey! it starts without pedal! hehe :doh:

Haven't driven it yet, but seems to rev quicker in neutral. We'll see here in a bit...
 
OK, so I need to back em down a click, as the pump likes to hang at 1500. But, HOLY BATMAN, really, when they say governor springs make it a new truck, they're really serious! I don't know why the heck I didn't do this a year ago!

If you're sittin on the fence about this mod and can't afford real GSK, DO THIS MOD!!!
 
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