barely running ,engine noise in top end ,pulled intake & vale covers, when I trun engine over ,it locks up at one point,timeing chain on pass side gets tight then loose---should repair be tried or replaced, I understand special tools needed for cams
engine noise on 2004 Ford Explorer
by worleybird in Danville, VA on June 24, 2010
ANSWER by dandd on June 24, 2010
These Engines do wear out the Timing Chains and depending on the exact type of 4.0 V6, there may be 2 chain sets. Only real repair is to replace them with new good quality chains and guides. here is repair info site with online manuals http://bit.ly/mitchell_repair_manuals_online
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