Clutch/ clutch linkage - JeepForum.com
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post #1 of 12 Old 09-20-2021, 06:58 AM Thread Starter
sk8brdtoday1
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Clutch/ clutch linkage

Hi,
I have a 1985 cj7 with a stock(original) clutch. It is extremely difficult to press down. If I got for a couple mile drive, it feels like I’ve been to the gym for an hour. One mechanic recommended I change the shift linkage as it was wrong, so I ordered linkage from quadratec. Still similar problem. He said he had to make a bushing for the linkage to line up? I will add a pic in a little while. Can someone send me the correct linkage or maybe address the issue?
Thanks!!

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post #2 of 12 Old 09-20-2021, 07:58 AM
bob4703
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Is this a problem you have always had or did it just show up recently?

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post #3 of 12 Old 09-20-2021, 08:11 AM Thread Starter
sk8brdtoday1
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Bought the jeep 3-4 years ago. Had the issue when I got it. 2 different mechanics said it’s not right and it’s clutch linkage. That was both of their opinions. Just curious if there is a different “correct” linkage? Or are both of the mechanics wrong? Or is it something else
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post #4 of 12 Old 09-20-2021, 09:54 AM
Ken4444
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If the clutch pedal is different to push, then it could also be a problem with the clutch pressure plate assembly (the actual clutch). This pressure plate assembly is ultimately what you're pushing against when you push the pedal and the associated linkages, bell crank, and throw out fork. The linkages and bell crank are pretty simple and should not provide much resistance compared to the clutch itself.

As a test, you should be able to disconnect/pull out the pushrod where it meets the throwout fork (see pic below). Let that rod dangle down, or remove it. Then the pedal. bell crank, and linkages move very freely with very little effort. If that's the case, then your problem is the clutch pressure plate assembly.
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throwout fork.jpg  

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post #5 of 12 Old 09-20-2021, 09:59 AM
bob4703
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I'm guessing that it has the old three finger clutch and needs to have it replaced with the newer type.

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post #6 of 12 Old 09-20-2021, 10:03 AM
John Strenk
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Does it have a body lift? Maybe pucks are too long?

That messes up the arms on the bellcrank. Ideally they should be around a 45* to 80* angle to the firewall to work smoothly. If the arm is almost vertical it takes more force at first. In that case you will need a longer rod from the pedal. Lets not even talk about the bell crank not being horizontal. This puts really odd forces into play.

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or as was previously mentioned it could be an old pressure plate.
If you play volleyball, keep it. as the clutch in my old F250 was super stiff but I could put my shoulders higher than an 8' net on a sand court.
When I eventually fixed the clutch, my vb game deteriorated. Now I'm lucky to get my eyes over on a hard court.

Could be worn parts also.
Look for stuff like this:

Pivot points could wear out on the rods like this:
clutchrodwear.jpg

And even the bellcrank can wear out.
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Usually these just prevent you from fully releasing the clutch making it hard to shift.
But they could be binding.

This was my favorite.
When this happens, the pedal drops real low any you have to bend your floorboards to get the clutch to release.

forkone.jpg

Another thing to think of is the throwout bearing dragging on the guide on the input cover to the tranny. I've seen worn out ones. but if was in a mud pit, mud could get pack up in there.

and lastly, if the pivot ball has fallen out, then the clutch arm pivots at a different location reducing you mechanical advantage.

missing pivot ball:


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post #7 of 12 Old 09-20-2021, 10:47 AM Thread Starter
sk8brdtoday1
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Thanks for the responses! So I have a correction I forgot. I did not originally have this issue. But the linkage snapped so I replaced it. And it looked identical upon replacement. But have had the issue since. In the pictures you can see the mechanic made some bushings and spacers to adjust for angle. Can anyone see any issue here. I’m also doing an old man emu swap this week and next. 2.5” lift. Old lift was like 3-4” so the angle should be less.
Attached Thumbnails
2B8A200F-EC49-4421-8B3A-E3AFB8484264_1632156371554.jpg   00AF98F0-0B8C-4475-991E-AFC220CEBFF5_1632156380524.jpg   46122B75-C6DC-44BE-BBF3-AC8C9BC5EDB9_1632156387779.jpg   8085C2F2-8937-4A1F-BD3C-6D625EC0561C_1632156398368.jpg   FAB08AE5-BCC5-4FD0-871D-46D7ACD5AF58_1632156420005.jpg  

A31214B0-46D8-45B4-A1A7-F0D40D77DB33_1632156432612.jpg   C6BC3CF7-960E-4FCB-8435-91B991F19E7D_1632156442879.jpg   E706CFF1-F677-4F8D-925D-E21E388206D8_1632156452955.jpg  
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post #8 of 12 Old 09-20-2021, 01:07 PM
John Strenk
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That doesn't look too bad.
Go with Ken4444 suggestion and drop the push rod and see how hard it it to move the rest of the linkage.


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post #9 of 12 Old 09-20-2021, 02:32 PM
keith460
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You got something wrong on that setup. The Z bar (Bellcrank) grease fitting should be facing down so it is accessible from underneath for regular greasing. And spacers off the Bell housing is something I have not seen before on the 258 engine. They should not be needed.

It's as though the the Z bar is upside down and the motor mounts for the I6 engine are too far back and causing more angle and the use of spacers.

My bet is the Z bar is upside down and needs to be flipped over to get the geometry and angles right for the link arms that attach to it.



clutchfork-4-.jpgclutchfork-5-.jpg

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post #10 of 12 Old 09-20-2021, 02:51 PM
Fourtrail
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Quote:
Originally Posted by keith460 View Post
You got something wrong on that setup. The Z bar (Bellcrank) grease fitting should be facing down so it is accessible from underneath for regular greasing.


It's as though the the Z bar is upside down

This right here, with the Z bar upside down and the long arm connected to the clutch pushrod and the short arm connected to the clutch pedal, you are losing your mechanical advantage. Flip the Z bar over and see what happens. Should be long arm to the clutch pedal and short arm to the clutch fork.
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post #11 of 12 Old 09-20-2021, 09:12 PM Thread Starter
sk8brdtoday1
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Thanks everyone! I’ll try flip the z bar this week and see if that helps
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post #12 of 12 Old 09-20-2021, 10:24 PM
jeepdaddy2000
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If you fail to fix it, there is a possibility that the rig has a "performance" clutch. High pressure clutches have a high pedal effort due to stiffer pressure plate springs.
In the end, you may have to look at your clutch assembly.

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