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Unread 05-10-2010, 12:58 AM   #1
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Join Date: May 2010
Location: San Diego
Posts: 1
Harmonic Balancer/Pulley

Hello all. I blew up the 258 in my 1981 CJ-5 and the replacement I got is an older block of an indeterminate year. Everything matches up except for a few things. The main thing I'm worried about is the motor I'm about to put in only has one pulley where the harmonic balancer (the alternator is on the lower driver side). The original block has a two pulley system and the alternator mounts on the upper passenger side. Am I going to create a mess by changing the pulleys/harmonic balancer?

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Unread 05-10-2010, 01:35 AM   #2
frank c
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1981 CJ5 
Join Date: Sep 2007
Location: northwest arizona
Posts: 403
Not totally positive on this but if your original had 2 pulleys the outer most pulley should be separate from the damper, in other words it bolts onto the damper with the 1 pulley to form a 2 pulley assembly.
So if you have a block that has mounting holes for your add on accessories like the alternator or steering pump you should be set to go by removing the original outside 2nd pulley and remove the bolts from the new block with the single pulley and add the 2nd to it. Then figure which bracket assembly's match up to the mounts .
If I'm out in left field with that somebody will surely chime in.
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cj-5 , harmonic balancer , pulleys
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