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Old 10-23-2010, 01:08 AM   #1 (permalink)
Trios
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A Cruise Servo Love Story: Two become One

So, my cruise control has never worked on my truck. I once attempted to remedy this by getting a 'new' cruise servo from sls639 (herein "sls"), but despite the exorbitant amount that I paid him for it, he gave me a bum servo. I got frustrated, ripped the bum servo off my truck, and both have been sitting under my work bench in the garage for months.

Well, the recent cruise control thread got me to thinking about them again, and I decided I would try and rip them apart to see what makes them tic, and if anything was salvageable.

So, here is what my servo looked like when I pulled off the cover.



And, here is sls's servo.



Mine was dirtier by far. So, I started doing some testing on these servos, and came to an interesting conclusion.

This is what my multimeter reads when set to read ohms and reading an open circuit:



This is what it was reading on my servo, pins A-C (should be 30-55 ohms)



This is what it was reading on C-E (also 30-55 ohms)



And this is B-D (should be 15-25 ohms)



Here is sls's servo (removed from housing, A-C)



sls (C-E)



sls (B-D)


So, obviously SLS's servo is within spec. I'd always noticed this servo felt funny though, and it became apparent why when I pulled the servo off the diaphragm housing:



The spring is in there 90 degrees off! I should not be able to see any spring when I look through that hole, but there it is.

And, the diaphragm itself is torn, which is no real surprise since the spring is in there crooked. Bad picture here, but you can still see it, around the metal portion on the rubber:



So, since my servo's diaphragm is in good shape (no holes, just dirty as hell) and sls's solenoid mechanism was working fine, I figured I'd just clean up all these parts and make one working unit.

Here is sls's solenoid mechanism after a thorough cleaning. If you use water at all during this process, make sure you let everything dry THOROUGHLY when you're done.



And, all the parts ready to be reassembled after they dry (from left to right): diaphragm housing, peanut butter, solenoid module, o ring, plunger and plunger pin (don't lose these, they fall right out after you take off the cover), brown sugar, mounting bracket, cover, throttle linkage + clip, and screws. You may omit the peanut butter and brown sugar.



I will update this thread after I get it all together and back in the truck to let you gents know it works out.

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Trios is right.
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x2 Trios is right lol

Last edited by Trios; 10-23-2010 at 01:12 AM.
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Old 10-23-2010, 04:22 AM   #2 (permalink)
wellgeo03
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Very nice write up so far. The testing info should be added to the stickys!!

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Old 10-23-2010, 09:16 AM   #3 (permalink)
Mikes85
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Just one question. Why would anyone want to omit the peanut butter And brown sugar when making servo cookies. That's just rediculous. Lmao
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mikes correct. twice today, wow man ,, lol.
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you guys ever wonder why my 6.2 goes so fast? all them rust holes, them is speed holes! makes it more areodynamical
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Ooh! De-railler! Chugga chugga chugga chugga whoo - D'oh!
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Ahh yes the old flex ring. Take the top cover off the IP and look for coffee grounds in the bowl. If yes that's the broken up flex ring. New IP and you're in business.
and ya'll call ME coffee grounds
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Old 10-23-2010, 10:53 AM   #4 (permalink)
Joeairforce
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Originally Posted by wellgeo03 View Post
Very nice write up so far. The testing info should be added to the stickys!!
Not gonna sticky it..... But I am going to add a link to it in the FAQ
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Old 10-23-2010, 11:04 AM   #5 (permalink)
Diaric
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Originally Posted by Joeairforce View Post
Not gonna sticky it..... But I am going to add a link to it in the FAQ
no joe, i am, i read it first
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well to make your pump retarded, you could let it hang out with me for a day
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Diaric wins thread derailment......
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Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
6.2 FAQ's AND ANSWERS Click Here
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Old 10-23-2010, 11:22 AM   #6 (permalink)
Joeairforce
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no joe, i am, i read it first
too late
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Old 10-23-2010, 02:08 PM   #7 (permalink)
Trios
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Fully reassembled servo:



Now, can anyone with c/c please do me a favor? I need to know the size/thread of the screws that mount the servo bracket to the throttle bracket. I lost mine somewhere in the last couple months and thus need new ones...
__________________
2003 Corvette Coupe, Quicksilver metallic, 6spd.
2005 Trailblazer 4.6L 4x4
1985 C30 Silverado, TH400, 6.2L all stock (except all mechanical gauges) w/ utility bed. SOLD
1997 Isuzu Rodeo 3.2L V6, 5spd, 4x4, brush guard, "Snowpacalype Beater" SOLD

Quote:
Originally Posted by IamDave0887 View Post
Trios is right.
Quote:
Originally Posted by Diaric View Post
x2 Trios is right lol
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Old 10-23-2010, 02:55 PM   #8 (permalink)
Mikes85
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Check the size of the screws that mount the throttle bracket to the IP. They're probably the same. Idk for sure cuz I don't have CC tho.
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1985 C20, 6.2, th400, 4.10 gears, locker, 86 ip upgrade, IP maxed, GM-1 Turbo, 13psi spike (8-10psi normal operation), pyro and boost gauges installed. Her name is Old yeller.


Quote:
Originally Posted by diaric View Post
mikes correct. twice today, wow man ,, lol.
Quote:
Originally Posted by 4320Diesel View Post
you guys ever wonder why my 6.2 goes so fast? all them rust holes, them is speed holes! makes it more areodynamical
Quote:
Originally Posted by argo View Post
Ooh! De-railler! Chugga chugga chugga chugga whoo - D'oh!
Quote:
Originally Posted by smackzed View Post
Ahh yes the old flex ring. Take the top cover off the IP and look for coffee grounds in the bowl. If yes that's the broken up flex ring. New IP and you're in business.
and ya'll call ME coffee grounds
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Old 10-23-2010, 03:18 PM   #9 (permalink)
Diaric
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trios.. its a course thread screw. if i measured correct m6 x 1.75 about 3/8" long. should be able to replace with a heavy sheet metal type screw
__________________
1987 6.2l Jimmy , being restored,4" lift, 35 mudders 1993 W350 5.9 , custom stretched cab, duelly flatdeck
2001 VW TDI Jetta 4 door loaded 2001 VW TDI Golf 2 door swapped engine project
Quote:
Originally Posted by 4320diesel View Post
well to make your pump retarded, you could let it hang out with me for a day
Quote:
Originally Posted by Hawkstrong View Post
Diaric wins thread derailment......
Quote:
Originally Posted by High Sierra 2500 View Post
Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
6.2 FAQ's AND ANSWERS Click Here
My Restoration Thread Click Here
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Old 10-23-2010, 03:51 PM   #10 (permalink)
Trios
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Perfect, thanks Rich. When my wife gets home with the truck I'll have to go grab some screws and get the cruise working again.

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2003 Corvette Coupe, Quicksilver metallic, 6spd.
2005 Trailblazer 4.6L 4x4
1985 C30 Silverado, TH400, 6.2L all stock (except all mechanical gauges) w/ utility bed. SOLD
1997 Isuzu Rodeo 3.2L V6, 5spd, 4x4, brush guard, "Snowpacalype Beater" SOLD

Quote:
Originally Posted by IamDave0887 View Post
Trios is right.
Quote:
Originally Posted by Diaric View Post
x2 Trios is right lol
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