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Unread 07-24-2005, 06:37 PM   #1
PAvementENDS
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2008 JK Wrangler 
 
Join Date: May 2004
Location: PA
Posts: 52
Flywheel question

I'm in the middle of my first engine swap and ran into a snag. I took a 258 from a 1984 J10 with a manual tranny and put it in my 1983 CJ7 with an automatic tranny. I had to take the flywheel from my old 258 since the engine came from a manual tranny truck and but now have alot of vibration when I start the engine. (by the way, it did start... whewhoo).

I noticed that the flywheel from the truck was balanced (holes drilled in the sides of the flywheel) and my old flywheel wasn't. What could be causing the vibrations when the engine is started and running? Do I need a different flywheel, are they matched to an engine, and if so; am I trying to find a flywheel to match that engine or tranny?

Thanks in advance and HEEELLLPPPP!!!!??

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Unread 07-26-2005, 04:38 PM   #2
geojeeper
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I am curious about this as well. I have a balance issue on mine too. Try asking at cjoffroad.com, this post might get more attention there.

Good luck.
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Unread 07-27-2005, 04:01 PM   #3
PAvementENDS
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Location: PA
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Found the problem

I found the problem with my jeep. The engine, coming out of a truck with a manual tranny, had a pilot bearing on the end of the crank' which has to be removed.

Hope this helps you with your problem.
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Unread 07-27-2005, 04:44 PM   #4
gumby
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the manual and auto flywheel are completly different weight and balance as well as a shim between the flywheel and the crank
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1984 CJ-7 offroad special loves to get dirty and play rough. unlike the girls I meet
258 rebuilt with torquer cam/ weber 32/36 carb, HEI ignition ,headers 4 in lift AMC 20 detroit rear locked and trussed / tru trax front 4:56 Gears ,solid axles on 35's

"Two roads diverged in a wood and I - I took the one less traveled by, and that has made all the difference."-
Robert Frost
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Unread 07-27-2005, 05:05 PM   #5
jlayne
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Quote:
Originally Posted by gumby
the manual and auto flywheel are completly different weight and balance as well as a shim between the flywheel and the crank
yep manual has a flywheel autos have a flexplate
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86 XJ 2.8 V6, 4 barrel carb, lift, tires... blah blah blah
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Unread 07-29-2005, 09:54 AM   #6
PAvementENDS
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So you're saying....

So are you both saying that I need to replace the flywheel also?
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Unread 07-29-2005, 09:57 AM   #7
gumby
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only if you have the wrong one installed
__________________
1984 CJ-7 offroad special loves to get dirty and play rough. unlike the girls I meet
258 rebuilt with torquer cam/ weber 32/36 carb, HEI ignition ,headers 4 in lift AMC 20 detroit rear locked and trussed / tru trax front 4:56 Gears ,solid axles on 35's

"Two roads diverged in a wood and I - I took the one less traveled by, and that has made all the difference."-
Robert Frost
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Unread 07-29-2005, 06:52 PM   #8
PAvementENDS
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Location: PA
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OK, still confused

I put the flywheel from my old engine on the new one because I am still using an automatic tranny. Is this right?
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