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Oilyrascal 11-04-2012 02:36 AM

Throwout fork
 
I posted this question within another section of this site and didnt have any luck with a helpful response so I am hoping to have better results here. Thanks again for all of your help.



I have what I am told is a 1970 351 W engine
I was told it was originally from a car such as torino ect ect from another ford forum and I am confident that I finally have that all sorted out and dont need to re-visit that again.

I am using this engine in a truck project, I do not however know what the trans came from originally, might be it is the same trans that has always been attached to the engine but I have a feeling not.

I pulled this engine and trans from a 68 F-350 so maybe the trans is original to that truck.

Anyway I notice that my throwout fork is fairly easily pulled out of and can be fairly easily inserted back into its place within the bellhousing.

Last weekend after scrounging clutch linkage parts at the boneyard I noticed that I cannot pull out the fork on other model trucks, ( I think they were early 80s or early 90s trucks ) they seemed to be held tight with some sort of internal spring that pulled the fork back in as I was trying to pull it out.

Stupid question maybe but what am I not understanding here. Why the differences?

I drove the 68 ( the truck I pulled the trans I am working with now ) for quite a few years and never had a problem shifting but that is not to say that whomever had done work in the past did anything correctly.

I dont want to get all of these clutch linkages fabricated/mounted and then have a throwout fork come out on me going down the road.

Thanks for any of your thoughts.

BTW if anyone can help me identify this trans that might be a help for the future.

Silver Surfer 11-04-2012 03:32 AM

Well I don't know anything about Fords, but I do know the clutch fork on my Chevy uses a retaining tab to clamp down on the throw out bearing. It is supposed to be there. One side of the retaining tab on the fork I removed from my truck was broken.

I did find this relevant Chevy place to buy a replacement tab, but in the end I saw some small cracks on the fork and decided to replace the whole thing.

Which brings me to my next point, clutch forks are cheap. Buy a new one and be done with it. If it turns out the replacement does not have a retaining tab, then return it and keep using the old one.

Oilyrascal 11-04-2012 03:50 AM

Quote:

Originally Posted by Silver Surfer (Post 1606745)
Well I don't know anything about Fords, but I do know the clutch fork on my Chevy uses a retaining tab to clamp down on the throw out bearing. It is supposed to be there. One side of the retaining tab on the fork I removed from my truck was broken.

I did find this relevant Chevy place to buy a replacement tab, but in the end I saw some small cracks on the fork and decided to replace the whole thing.

Which brings me to my next point, clutch forks are cheap. Buy a new one and be done with it. If it turns out the replacement does not have a retaining tab, then return it and keep using the old one.

Thanks, that might be the way I may have to go unless someone knows something different.

LATECH 11-04-2012 01:20 PM

Nope , hes right.
The fork has spring steel on the bearing end for the throw out bearing AND a small spring steel fork at the pivot , to keep the fork located on the pivot. Both are needed for long life of the throwout bearing.

By the way, in the future, do not create an Identical post. Just bump the original post up to the front if you feel the need.

Oilyrascal 11-04-2012 01:25 PM

Quote:

Originally Posted by LATECH (Post 1606987)
Nope , hes right.
The fork has spring steel on the bearing end for the throw out bearing AND a small spring steel fork at the pivot , to keep the fork located on the pivot. Both are needed for long life of the throwout bearing.

By the way, in the future, do not create an Identical post. Just bump the original post up to the front if you feel the need.

I guess Ill have to pull out that fork and take a second look at it then, dont remember any spring but that does not mean much. Thanks

cobalt327 11-09-2012 12:02 AM

Quote:

Originally Posted by Oilyrascal (Post 1606990)
I guess Ill have to pull out that fork and take a second look at it then, dont remember any spring but that does not mean much. Thanks

Between the spring clips that hold the throw out bearing (TOB) to the fork (this isn't a regular spring) and the spring steel clip to the pivot ball, the fork is held relatively securely- as you have found out in the boneyard.

If your fork comes out easily, start by checking the spring clip to the pivot ball as mentioned previously, along w/checking the pivot ball itself. The fork clips holding the TOB can be checked as well. If there's any doubt, replace the fork and pivot ball- neither costs that much and they're an important part of the mechanism. If they're worn out the Z-bar and the rest of the linkage prolly needs attention as well. This would be a good time to go over all of it.

You might consider using a hydraulic TOB assembly if the whole thing is shot.

BTW, if the tranny is a 4 speed original to the Torino (10 bolt top cover) it's a Toploader. If it's a 3-speed w/a 9 bolt top cover it's a Tremec. But you do need to be more specific- like you said yourself, we're not mind readers!

1971BB427 11-15-2012 02:56 PM

Not sure when they changed, but the other day I pulled a clutch fork out of a late 80's Chevy Suburban 4WD, and no clip for the pivot ball. Seemed very strange to me, as I can only think the hydraulic slave somehow holds tension on it, but then that would cause the throwout bearing to constantly turn, which is bad.
Anyone else noticed these later forks with no clips?

Oilyrascal 11-15-2012 04:50 PM

Thanks for all the replies, I am juggling a few things at once with this project but will be back on this deal shortly and post what I come up with


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