1985 Chevy Silverado hydralic clutch

Tiny
CORKYDRIVN
  • MEMBER
  • 1985 CHEVROLET SILVERADO
Transmission problem
1985 Chevy Silverado V8 Four Wheel Drive Manual

Installed new clutch assembly along with clutch master and clutch slave. Bled the system and finally got a hard peddle. When I try to shift gears I have to go all the way to the floor and reverse wont shift. Turn off the truck and it shifts fine. The first time I bled the system it shifted easier, but you still had to put the clutch to the floor. The second time I bled the system and moved the truck you had to force the truck into gear. Need Help any ideas
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Sunday, July 25th, 2010 AT 5:41 PM

22 Replies

Tiny
MHPAUTOS
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Hi there,

Thank you for the donation,

Do you have any free play in the pedal, how far does the pedal go down before pressure is felt? Do this with your hand to judge it better.

Mark (mhpautos)
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Sunday, July 25th, 2010 AT 7:13 PM
Tiny
CORKYDRIVN
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Peddle is hard and about 1" freeplay
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Sunday, July 25th, 2010 AT 7:18 PM
Tiny
MHPAUTOS
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Can you measure the clutch slave cylinder movement with the pedal down, how far does the slave move in total? Does the clutch fork feel loose, did you check and lube the release bearing movement on the nose of the transmission? Did it have free and non binding movement?

Mark (mhpautos)
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Sunday, July 25th, 2010 AT 7:29 PM
Tiny
CORKYDRIVN
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1" travel, the fork is not loose yes lubedand it slid free.
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Sunday, July 25th, 2010 AT 7:40 PM
Tiny
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OK, just trying to locate your can on Mitchell 1 data base, and a silverado does not come up for Chev in that year. As I am in Australia I don't know what else it may come under, was told a C1500 but that was not there, is there any other I.D that you can help me with here,

Thanks, mark.
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Sunday, July 25th, 2010 AT 8:00 PM
Tiny
CORKYDRIVN
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It is a 1985 3/4 ton 4X4 Chevy Silverado
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Sunday, July 25th, 2010 AT 8:14 PM
Tiny
MHPAUTOS
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Hi there, still not coming up in the data base for some reason, so I just sent an SOS to other mods in the US to help me track down the tech info I need, will post as soon as I get any replies.

Mark (mhpautos)
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Sunday, July 25th, 2010 AT 8:38 PM
Tiny
CORKYDRIVN
  • MEMBER
Thank You Mark

I'm on solar power here in Arizona about 75 miles from anywhere. If I don't answer back, the power ran low and I'll be on at sun up. Nothing buy clouds and rain

George
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Sunday, July 25th, 2010 AT 8:49 PM
Tiny
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Thanks for that,

I will post and await your response in good time.

Mark
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Sunday, July 25th, 2010 AT 9:32 PM
Tiny
RASMATAZ
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Recheck and test the clutch master cylinder.
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Sunday, July 25th, 2010 AT 10:09 PM
Tiny
CORKYDRIVN
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Suns up Mark, any ideas yet?
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Monday, July 26th, 2010 AT 9:39 AM
Tiny
CORKYDRIVN
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Checked master cylinder & bled the system from the slave cyl. Have a hard peddel about 1" freeplay in peddel. 1" travel in slave cyl.
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Monday, July 26th, 2010 AT 9:55 AM
Tiny
CORKYDRIVN
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Mark are you there? Did you come up with some answers for me?
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Monday, July 26th, 2010 AT 9:06 PM
Tiny
MHPAUTOS
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Hi there,

sorry, had some family issues to deal with, I will sit down this evening my time (it's 3-00PM now) and send some info, just popped in from work so I don't have time just now, just wanted to let you know that I have not forgotten about it.

Mark
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Tuesday, July 27th, 2010 AT 12:14 AM
Tiny
MHPAUTOS
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Hi there,

Well after all that messing around I found what I was looking for, and you say that you have about 1" travel at the slave cylinder, well that is what I was looking for, so as far as I can ascertain so far the hydraulic system is working correctly, so I am wondering if there is a problem with some form of contaminate on the clutch surface.
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Tuesday, July 27th, 2010 AT 6:22 AM
Tiny
MHPAUTOS
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Further to that last post,

With new clutch assemblies, the pressure plate is coated with an anti rust compound, if so was this removed?
I feel that this will be a mechanical issue with the clutch assembly, I do think that the box will have to be removed and the clutch ass inspected for any faults.

Mark (mhpautos)
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Tuesday, July 27th, 2010 AT 6:30 AM
Tiny
CORKYDRIVN
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Hello Mark.
Sorry I didn't get back sooner had some computer issues. I am pulling the box tomorrow, will let you know what I find. George
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Tuesday, July 27th, 2010 AT 8:43 PM
Tiny
MHPAUTOS
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We have a job at work with similar problem, fairly good pedal feel good through at the cylinder, we pulled the box to find that the clutch fork was cracked and bending rather than operating the clutch, main problem was the fork pivot ball was not lubed and that was where the crack started, it had a new clutch not long ago, the mechanic didn't re lube the pivot, this was a 2 WD Toyota Hi-Lux.

Mark (mhpautos)
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Wednesday, July 28th, 2010 AT 5:55 PM
Tiny
CORKYDRIVN
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Pulled the box Thursday and didn't find anything wrong. The clutch fork is OK and the pivot ball is well lubed. Clutch disk is in the right way all looks good. The pressure plate measures 1/4" higher then the old one don't know if that makes a difference. The clutch set came from NAPA Auto Parts and they only listed one for the year of my Truck. I've been rained out the last two days, so when it dries up I'm going to the chevy dealer and have them look at the old and new clutch to see what they think. I'll let you know.

George
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Saturday, July 31st, 2010 AT 12:15 PM
Tiny
MHPAUTOS
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HI George,

late night here it's 3-30 AM, well i think that the pressure plate is going to be the fault, i get a few different part No's depending on which V8 engine, this may help.


http://www.2carpros.com/forum/automotive_pictures/61395_Capture_64.jpg



Mark.
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Saturday, July 31st, 2010 AT 12:28 PM

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