Mad Professor
Contributor
Posts: 186
Reg: 12-30-08
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08-16-23 07:42 PM - Post#2861623
This is the first anything that has a POS hydrualic clutch.
85 C10 M465 creeper.
Pressed clutch down, then fell to floor. Snap ring popped out of MC on linkage.
WTF??? I fixed it . Will it repeat?
Had this truck > 10,000 miles, no work on these parts.....
62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package
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 gchemist
Member #271 Senior Chevytalk Moderator
Posts: 25950
Loc: Austin, TX 78748
Reg: 05-09-00
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08-17-23 04:11 PM - Post#2861651
In response to Mad Professor
It’s why slave cylinders were invented. Breaking parts was common with a hard pedal clutch.
Did you use a new clip?
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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Mad Professor
Contributor
Posts: 186
Reg: 12-30-08
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08-18-23 12:25 AM - Post#2861663
In response to gchemist
I put the clip back in might not have seated fully? It popped out again and 2nd time I made sure it was seated. Will see if it stays.
Are the clips sold separate from the cylinders, or will I have to match one up?
It may be part of the push rod assy?
How can I post a scan of the page in the service manual?
I have no idea why it popped out.
62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package
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Edited by Mad Professor on 08-18-23 12:48 AM. Reason for edit: No reason given.
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Mad Professor
Contributor
Posts: 186
Reg: 12-30-08
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08-25-23 02:18 PM - Post#2861911
In response to Mad Professor
Has not popped out again.
When this first happened, it was raining and foot slipped off pedal a few times getting into gear.
I think the going from tne floor to back up popped out the clip. Last timè foot slpped is when clip popped out
62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package
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gchemist
Member #271 Senior Chevytalk Moderator
Posts: 25950
Loc: Austin, TX 78748
Reg: 05-09-00
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08-26-23 05:19 AM - Post#2861926
In response to Mad Professor
Is the clip similar to the brake pedal clip? The brake clip lock has to lock on the rod grove. If it does not, it will pop out. I've received calls to help remove those clips. I use a small flat head screwdriver.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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Mad Professor
Contributor
Posts: 186
Reg: 12-30-08
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 09-18-23 01:57 PM - Post#2862646
In response to gchemist
I've located the problem,....... after the master cylinder pushrod popping out a few more times........I've gotten good at putting it back in. I've used a small flat blade screwdriver to get the circlip back in, make sure it is fully seated. You'll also need a good light to see in there
I never would have found this without the truck service manual. I have a 1986 version. > 1500 pages......took a while to find this.
On page 7C-5 there is a diagram of the hydraulic clutch pedal assy. The parts are listed in figure 1. Part #111 is a rubber bumper, that mounts above the pedal on a metal support plate, that restricts the clutch pedal travel on return. I never would have looked for this as the problem without the service manual.
If it is damaged or missing, if your foot slips off the clutch pedal it will return and yank on the master cylinder pushrod. Part is discontinued, chevy # 12338127 I'm looking for a source, may have to fabricate one.
I assume this may be on many cars/trucks with hydraulic clutch systems. So if the pushrod pops out, check this.
62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package
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Edited by Mad Professor on 09-18-23 05:20 PM. Reason for edit: typo, #111 not #11
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gchemist
Member #271 Senior Chevytalk Moderator
Posts: 25950
Loc: Austin, TX 78748
Reg: 05-09-00
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09-19-23 04:15 AM - Post#2862662
In response to Mad Professor
Reference photo provided by Mad Professor.
Interesting. I've never would have guess without a diagram or manual truck.
If you take an assembly pic, please forward it. We can post it for reference.
Nice work!
 Attachment: bump.jpg (44.98 KB) 0 View(s)
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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gchemist
Member #271 Senior Chevytalk Moderator
Posts: 25950
Loc: Austin, TX 78748
Reg: 05-09-00
|
09-19-23 04:17 AM - Post#2862663
In response to gchemist
Is it this small?
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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Mad Professor
Contributor
Posts: 186
Reg: 12-30-08
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09-19-23 08:01 AM - Post#2862666
In response to gchemist
Damm @gchemist! You found the same source!
62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package
|
|
Mad Professor
Contributor
Posts: 186
Reg: 12-30-08
|
09-19-23 10:50 AM - Post#2862674
In response to Mad Professor
I've located the problem,....... after the master cylinder pushrod popping out a few more times........I've gotten good at putting it back in. I've used a small flat blade screwdriver to get the circlip back in, make sure it is fully seated. You'll also need a good light to see in there
I never would have found this without the truck service manual. I have a 1986 version. > 1500 pages......took a while to find this.
On page 7C-5 there is a diagram of the hydraulic clutch pedal assy. The parts are listed in figure 1. Part #111 is a rubber bumper, that mounts above the pedal on a metal support plate, that restricts the clutch pedal travel on return. I never would have looked for this as the problem without the service manual.
If it is damaged or missing, if your foot slips off the clutch pedal it will return and yank on the master cylinder pushrod. Part is discontinued, chevy # 12338127 I'm looking for a source, may have to fabricate one.
I assume this may be on many cars/trucks with hydraulic clutch systems. So if the pushrod pops out, check this.
I may have to eat crow on this one.
When I found the parts diagram , it was pouring rain yesterday. The diagram looks like the bumper is for pedal return.
I just got my face up under there better today, and it appears the bumper is for when you push the pedal down. And the bumper is much smaller than mentioned in several online sources (4" X 4"). It's more like 1.5" X 1.5".
Seems the clip popping out is still a mystery. I'll look better again later. I have to put the dust seal back over the pushrod/master cylinder which is almost as much of a PITA as getting the clip in. Last time it popped out it was raining and I had to get home, seal was not a priority.
I've got to work on a tractor this afternoon.
62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package
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Edited by Mad Professor on 09-19-23 10:52 AM. Reason for edit: No reason given.
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gchemist
Member #271 Senior Chevytalk Moderator
Posts: 25950
Loc: Austin, TX 78748
Reg: 05-09-00
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09-19-23 02:56 PM - Post#2862684
In response to Mad Professor
Ha! Same search engine!
Nice LWB truck!
Attachment: C10.jpg (111.59 KB) 0 View(s)
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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