Great, I'm Fhuked, now what? - Pirate4x4.Com : 4x4 and Off-Road Forum

masterbeavis · 04-16-2002, 10:13 PM

I have a small challenge. I have a NP435. The motor that used to be behind it WAS a 351M, now it is a 460. I am using a Centerforce Dual Friction clutch. (DF70000)

Heres the dilema
The clutch will not disengage!

The details:
The old flywheel (from 351) sat further up twards the front of the truck, whereas the flywheel for the 460 sits about 1/4-3/8" further back than the OE flywheel. This appears to be because of the fact that the crank has more material sticking out past the end of the block on the 460 in relation of the 351M (about 1/4" more)
Old and new clutch are diagphram style
The flywheel I am using is from a 360 motor that had a 3 speed tranny. ('76 F150)
The clutch fork is experiencing full travel, the clutch pedal feels like something is stopping it when it nears the floor
A taller or shorter throwout bearing will not help I have tried adjusting the clutch rod all the way out, and the clutch still wont disengage

My questions are this.

1. Is there a neutral balance flywheel out there that has a negative offset twards the motor (that came from a ford product) that will bring the flywheel 1/4" back?

2. If not, will the flywheel from an '83 and later truck have the offset I need to move flywheel closer to motor?

3. When talkin to the the centerforce's tech guy, he said I was on the road to pre-mature failure because the clutch is too small for my application. Is this guy full of beans?? I really hope so.

4. How far do the fingers need to be pushed in for the clutch to disengage?

5. WHy would the centerforce tech guys initially recommend a clutch another employee says that is clutch is too small for my application????!?

6. I have also been told by a couple of board members that I will not like his clutch for offroad use? Any experience with this clutch?
Any other ideas, comments or suggestions?? (helpfull ones anyways??)

ONETUFF76 · 04-16-2002, 11:59 PM

been running mine behind my 390 for 3yrs now with no probs

masterbeavis · 04-17-2002, 11:44 PM

OK, its official, I am a moron!! The problem is that the clutch disc was catching the flywheel bolts. I ground about 1/8" off of the tops of the bolts and the problem is temporarily solved. I am going to buy some lower profile bolts to replace these ones.

Thumper046 · 04-20-2002, 10:38 AM

Congrats on locating the problem!!! Ihope the rest goes well also

04-16-2002, 10:13 PM	#1 (permalink)
masterbeavis Registered User Join Date: Jan 2002 Member # 9468 Location: Eldorado BFE, East of sac Posts: 2,827	Great, I'm Fhuked, now what? I have a small challenge. I have a NP435. The motor that used to be behind it WAS a 351M, now it is a 460. I am using a Centerforce Dual Friction clutch. (DF70000) Heres the dilema The clutch will not disengage! The details: The old flywheel (from 351) sat further up twards the front of the truck, whereas the flywheel for the 460 sits about 1/4-3/8" further back than the OE flywheel. This appears to be because of the fact that the crank has more material sticking out past the end of the block on the 460 in relation of the 351M (about 1/4" more) Old and new clutch are diagphram style The flywheel I am using is from a 360 motor that had a 3 speed tranny. ('76 F150) The clutch fork is experiencing full travel, the clutch pedal feels like something is stopping it when it nears the floor A taller or shorter throwout bearing will not help I have tried adjusting the clutch rod all the way out, and the clutch still wont disengage My questions are this. 1. Is there a neutral balance flywheel out there that has a negative offset twards the motor (that came from a ford product) that will bring the flywheel 1/4" back? 2. If not, will the flywheel from an '83 and later truck have the offset I need to move flywheel closer to motor? 3. When talkin to the the centerforce's tech guy, he said I was on the road to pre-mature failure because the clutch is too small for my application. Is this guy full of beans?? I really hope so. 4. How far do the fingers need to be pushed in for the clutch to disengage? 5. WHy would the centerforce tech guys initially recommend a clutch another employee says that is clutch is too small for my application????!? 6. I have also been told by a couple of board members that I will not like his clutch for offroad use? Any experience with this clutch? Any other ideas, comments or suggestions?? (helpfull ones anyways??)

04-16-2002, 11:59 PM	#2 (permalink)
ONETUFF76 Registered User Join Date: Feb 2000 Member # 56 Location: Salt Lake City, UT Posts: 2,432	been running mine behind my 390 for 3yrs now with no probs __________________ 76 F-250 High-Boy Built Not Bought "Got MASSEY?" Next time try letting the clutch out easier.

04-20-2002, 10:38 AM	#4 (permalink)
Thumper046 Registered User Join Date: Dec 2001 Member # 8519 Location: Rainier, Wa Posts: 158	Congrats on locating the problem!!! Ihope the rest goes well also __________________ Keep the rubber side down!!! Absolute power corrupts absolutely, Which is a problem if your absolutely powerless.

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04-17-2002, 11:44 PM	#3 (permalink)
masterbeavis Registered User Join Date: Jan 2002 Member # 9468 Location: Eldorado BFE, East of sac Posts: 2,827	OK, its official, I am a moron!! The problem is that the clutch disc was catching the flywheel bolts. I ground about 1/8" off of the tops of the bolts and the problem is temporarily solved. I am going to buy some lower profile bolts to replace these ones.