Engine/Transmission (1994 - 1998) NV4500 Question

[JoelMartin]

My buddy has a 1997 12 valve NV4500 with a southbend clutch. He says that the clutch will not disengage the whole way when he pushs in the pedal. It has worked fine for many miles before this. Any ideas? He would appreciate a quick answer.

 

[HRDROKN]

My buddy has a 1997 12 valve NV4500 with a southbend clutch. He says that the clutch will not disengage the whole way when he pushs in the pedal. It has worked fine for many miles before this. Any ideas? He would appreciate a quick answer.

OK... I'll take at stab at it. I think all 2nd gens had the hydraulic clutch slave/master set up.



Did he check that the clutch cylinder has enough fluid in it? Any signs of leakage?



My . 02

 

[JoelMartin]

He said he checked that and it was good. Is there any chance of it bypassing fluid internally? Appreciate the quick answer.

 

[MMeier]

He said he checked that and it was good. Is there any chance of it bybassing fluid internally? Appreciate the quick answer.

My trans guy says yes.

 

[JoelMartin]

So should he check into getting new hydraulics? Is there an upgraded system from southbend?

 

[Dodgentwo]

I had this problem and one of the pressure plate bolts snapped off. My clutch was a dual disc. Is his clutch a single or dual?

 

[Dodgentwo]

Or check the throw out bearing

 

[JoelMartin]

I had this problem and one of the pressure plate bolts snapped off. My clutch was a dual disc. Is his clutch a single or dual?

Its a single disc. Thanx

 

[Don Tanklage]

how much play does the pedal have?



on the first gen trucks the pin on the clutch pedal and the hole on the end of the pull rod wear and it gets sloppy and you lose a lot of the throw

 

[JoelMartin]

He said it has a little play but its the same as it was before when it did still disengage.

 

[Woodenhead]

Could be throw out bearing. Is it just hard or impossible to get into gear or does it actually drag the clutch a little. Where does it engage when he lets the up on the cluch. If it hooks right at the bottom then maybe hydraulics or severly worn throw out fork. If it hooks a little ways up and it's just hard to get into gear and not draggin then I'd put my money on the bearing.



South bend does have upgraded hydraulics and from what I understand for less than the dealer.

 

[JTroiano]

I started to destroy the center of the SB disc and it was deformed so it looked like a food dish. Sorta concave. New upgraded clutch took care of the problem. To much torque on the disc.



Jon T

 

[JoelMartin]

Could be throw out bearing. Is it just hard or impossible to get into gear or does it actually drag the clutch a little. Where does it engage when he lets the up on the cluch. If it hooks right at the bottom then maybe hydraulics or severly worn throw out fork. If it hooks a little ways up and it's just hard to get into gear and not draggin then I'd put my money on the bearing.



South bend does have upgraded hydraulics and from what I understand for less than the dealer.

I just talked to my buddy and he says his mechanic thinks its the throw out fork. He said it is impossible to get in some of the gears but some go in easier than others. It seems to be easier to get in gear when its cold and now it seems to hook about the same place it did when it worked good. The gears feel very mushy when he tries to shift. From what you say it sounds like the bearing. Tomorrow he's gonna get his mechanic to drop the transmission and see if he can find whats wrong. Anymore advice?

 

[BigPapa]

If it's the small (12") clutch with the sprung hub I'd say it's coming apart on him and some of the pieces have fallen down into the spring fingers. Happened to me.



If not that I'd say it's the pilot bearing.



Scott

 

[JoelMartin]

My buddy just called and told me what his mechanic found in his transmission. He said both the pilot bearing and the throw out bearing needed replaced. Also where there gear shift is fastened it was coming loose which would explain the spungy feeling. I appreciate all the replies that I could pass on to him.