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This special tool is needed to align the timing chain cover on the Jeep 4.0L engine and others (AMC 242 / Renix, Jeep 4.2L). The timing cover bolts are a slop fit and if the front crank seal is not perfectly centered to the crank you'll have an oil leak.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.