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Unread 02-09-2015, 12:56 PM   #1
DJ5GUY
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1979 DJ 
 
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Iron Duke flywheel

I have a 2.5l Iron DUke and cannot find the correct flywheel for it. I'm converting my 1979 DJ5 to four wheel drive. I cannot find a 153 tooth flywheel with the correct pattern to the crank. It is NOT the same as a SBC engine. The pattern is much smaller. I know the early 80's CJ5's came with the same motor but cannot find a flywheel anywhere. Local parts stores and websites dont even list one. I have searched on-line for days with no conclusion. HELP!

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Unread 02-09-2015, 01:40 PM   #2
Partsmke
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1998 YJ Wrangler 
 
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Quote:
Originally Posted by DJ5GUY View Post
I have a 2.5l Iron DUke and cannot find the correct flywheel for it. I'm converting my 1979 DJ5 to four wheel drive. I cannot find a 153 tooth flywheel with the correct pattern to the crank. It is NOT the same as a SBC engine. The pattern is much smaller. I know the early 80's CJ5's came with the same motor but cannot find a flywheel anywhere. Local parts stores and websites dont even list one. I have searched on-line for days with no conclusion. HELP!
Do you have a picture of the engine? Some Dispatchers in 1979 were built using an Audi 2.0 4 cyl engine. 1982-84 DJ's had the Iron Duke as did CJ's 1980-82 and a bunch of AMC cars through 1983.
The Iron Duke has a 6 bolt x 3.625" bolt circle, the same as Chevy V8's of the day.
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Unread 02-09-2015, 07:14 PM   #3
DJ5GUY
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I can take a picture for ya. It originally had the Audi engine in it. The previous owner had the 2.5 installed. Do you know where the engine numbers would be to confirm model and year of the motor?
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Unread 02-09-2015, 07:48 PM   #4
DJ5GUY
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Here are a few pictures. It had the 907 AT in it and I have test fitted my GM SB bell housing to the engine all is good there.
dj-engine-003.jpg   dj-engine-007.jpg   dj-engine-001.jpg   dj-engine-006.jpg  
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Unread 02-09-2015, 08:10 PM   #5
DJ5GUY
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I cannot find anywhere on the internet a flywheel for a CJ with a 2.5l.
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Unread 02-13-2015, 07:59 AM   #6
DJ5GUY
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Quote:
Originally Posted by Partsmke View Post
Do you have a picture of the engine? Some Dispatchers in 1979 were built using an Audi 2.0 4 cyl engine. 1982-84 DJ's had the Iron Duke as did CJ's 1980-82 and a bunch of AMC cars through 1983.
The Iron Duke has a 6 bolt x 3.625" bolt circle, the same as Chevy V8's of the day.
So nobody out there has the answers? The Iron duke does NOT have a 3.625 pattern. It is much smaller. I measured 2.312. It looks more like a YJ or Cherokee pattern. Like the newer 2.5L. But, I don't know for sure.
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Unread 03-09-2015, 09:12 PM   #7
DJ5GUY
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280 Jeeper views but nobody
has any idea?
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Unread 03-10-2015, 05:42 AM   #8
Mike Romain
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My book (Haynes) says the ID code is on the top front of the engine. Back then they did call it a 151ci engine, maybe that makes a difference in searching parts?
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Unread 03-10-2015, 08:52 AM   #9
dirtdudeaz
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A friend of mine had a similar problem with the later 2.5. If I remember right, he ended up getting his resurfaced; could not find any new one....anywhere!

If you don't have one, I would suggest trying to find a used one from a junkyard/jeep parts yard/ebay/craigslist/etc... and getting it machined.
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Unread 03-11-2015, 02:08 PM   #10
Partsmke
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Quote:
Originally Posted by DJ5GUY View Post
280 Jeeper views but nobody
has any idea?
It appears to have a Pontiac Fiero crankshaft flange. Check the Fiero pages they have a lot of pictures of the crank flange, it shows that it has a one piece seal that the flange seals in. They also list a new 153 tooth flywheel for that crank.
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Unread 03-11-2015, 08:29 PM   #11
Ken4444
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Is that a fuel filter connected to the vapor canister?
jeep-fuel-filter-charcoal-vapor-canister.jpg  
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Unread 03-12-2015, 01:21 PM   #12
stokey04964
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Does not help you right now but I'm about to take my Iron Duke out and will have a fly wheel for you. It may be a few more weeks but I hope to have it out around the first of April. Let me know if you want it. It's coming out of a 1980 CJ.
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Unread 03-12-2015, 08:02 PM   #13
Jeepcj30
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Well I know it's a duke. To bad Mines not on The stand still or I would measure the flywheel for you.
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Unread 04-05-2015, 08:12 PM   #14
DJ5GUY
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The fuel filter was there when I bought it. I drove it for 3 days then commenced to the 4WD and manual tranny swap. It sits now. waiting for time to put the master and slave in for the clutch (which i don't have yet do to no flywheel that will fit) I was reading that Fieros had the same motrr and appear to have the smaller bolt circle on the crank. I just needed confirmation on that before I spent the money. Tranny and t-case are in, Just need to do drivelines and clutch.
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