post #1 of Old 08-31-2015, 12:03 AM Thread Starter
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1988 YJ Wrangler 
Join Date: Feb 2009
Location: Green Bay, WI
Posts: 150
4.2 258 chain tensioner?

What is needed for a 4.2 258 timing chain replacement?
most reference I can find says spring tension on 2.5, Snubber on 4.0 and ??? on the 4.2 . If I need the Snubber then I need a new cover as my loose NYLON toothed timing ground the tabs for a non existent snubber. If not then Cloyes Steel timing set, Seal and Felpro gasket set and I am re assembleramma.

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post #2 of Old 08-31-2015, 06:09 AM
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I just read the FSM and did not see a tensioner at all for the 4.2......

Tip though.. When you put the cover back on, it has a little bit of adjustment left and right, so put it on and loosely bolt it up an Then take the pulley and put it on the crank shaft. This way the seal has equal pressure all the way around the pulley. Then tighten the bolts. If you have to pull the pulley off to get at the rest of bolts.. Just stick it on enough to engage the seal so you can pull back off by hand
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post #3 of Old 08-31-2015, 08:49 AM
Mike Romain
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1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant
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No tensioner. X2 on setting the crank pulley in place to center the seal. Once the cover bolts that you can get to are tight, you take the pulley back off to get the ones under it.

86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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