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Unread 02-10-2014, 09:19 AM   #1
cdt540
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1983 CJ7 
 
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Flywheel, clutch ? on rebuilt motor

The short story is I had an 83 258 that needed to be rebuilt but there was a chip out of the block where one of the waterpump bolts went so I sourced another "83" block to be rebuilt. Unfortunately I bought it sight unseen and the seller mis-read the build date and the motor was actually a '79. So the machine shop who rebuilds Jeep motors for the local Jeep specialty shop rebuilt the '79 block and used the 83 head. The shop drilled out the head bolts holes so the 83 head would fit (said he had done it several times). I have an aftermarket aluminum valve cover that I wanted to keep. So my questions are:

1. It appears the flywheel and clutch are different part numbers on the 79 vs. the 83. So I should not use the 83 flywheel I have and buy a new one specifically for the 79? The 79 i bought was and automatic so no flywheel came with it.

2. What is your opinion on re-using the flywheel bolts? Exact replacements don't appear readily available. ARP has them for the 4.0. Would those work?

I guess the question really is I should consider this a '79 motor except for parts directly related to the head/intake/exhaust manifold?

Thanks for your feedback....

Chris
'83 CJ7 (258 4spd)
Austin TX

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Unread 02-10-2014, 09:25 AM   #2
LumpyGrits
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Do not reuse f'wheel bolts.
I have no clue about 4.0 f'wheel bolts.
What you are looking for, is to NOT have the bolts protrude from the back side of the crank.
Your shop should be able to short'n a bolt with ease on a lathe.
LG
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Unread 02-10-2014, 09:33 AM   #3
John Strenk
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Agree, do not reuse flywheel or clutch bolts.

As for the flywheel, the only thing I ever ran into was two different set of clutch housing holes on some flywheels although I've only ever seen one diameter for the clutch ever recommended on those CJ's.

The clutch would be different because different transmissions were available between those years. I think is 79 only the T-150 or T-18 was available were as in 83 you had the T-5, T-4 T-176 Available.
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Unread 02-11-2014, 08:50 AM   #4
cdt540
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Quote:
Originally Posted by John Strenk View Post
Agree, do not reuse flywheel or clutch bolts.

As for the flywheel, the only thing I ever ran into was two different set of clutch housing holes on some flywheels although I've only ever seen one diameter for the clutch ever recommended on those CJ's.

The clutch would be different because different transmissions were available between those years. I think is 79 only the T-150 or T-18 was available were as in 83 you had the T-5, T-4 T-176 Available.
So as far as you know the flywheels on a '79 and '83 are the same (teeth, weight, etc) except for the clutch mounting holes. So as long as I buy the clutch kit for an '83 I should be OK? I am running out of project $$$ and I really don't want to have to buy another flywheel (already paid to have the 83 resurfaced). I don't want to cut any any corners at this point but more $$$ means more delays and spring is coming....!
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Unread 02-11-2014, 09:29 AM   #5
Balvar24
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I think 83 had a bellows type clutch standard. 79 had the lever type. How strong is your left leg? Good knees?
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Unread 02-11-2014, 10:30 AM   #6
kirbot
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I actually did reuse the flywheel bolts...

If I knew then what I know now, I'd have just spent the money to replace them for the peace of mind.
But... No problems yet, and I doubt there will be any.
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Unread 02-12-2014, 09:36 AM   #7
cdt540
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It appears that the '83 flywheel will work on the 79 motor. Although many suppliers show different parts number many show the same also. The same goes for pressure plates. where the difference appears is in the clutch plate and pilot bearing. The 83 shows a 10 tooth 1 1/8 spline while the 79 shows a ten tooth 1 1/16th spline. So it would seem to me that the flywheel is OK and if I purchase an '83 clutch kit to mate up to my T-5 I should be OK. Does that seem reasonable? Certainly someone has mated a T-5 to a '79 and prior CJ and had to deal with this isse. This is definitely something I don't want to get wrong and have to go back in...

Thanks again....

Chris
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Unread 02-12-2014, 09:38 AM   #8
CSP
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You definitely have it all figured there. The only real difference is the clutch disc because of the input shaft diameters.
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Unread 02-12-2014, 01:24 PM   #9
cdt540
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Great...thanks all for the feedback!
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