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How many miles will 1998 Ford Explorer 4.0 V6 SOHC timing chains that were replaced at 60k mi in 2004 per recall last after they start making a rattle noise at idle rpm and mostly when engine is cold?
Wiki User
∙ 16y ago
Should not rattle again ever - its not the chains, but the tensioner(s) that cause the rattle and they have been re-designed, and now keep pressure on startup. To avoid failure, replace the chain's (all 4 on a 4*4, 3 on 2wd) every 100k miles - or drive until death and put in a new motor! The chains may last longer than 100k, they may even last 500k in a long journey motor.
Wiki User
∙ 16y ago
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You must have a 4.0 SOHC. It's not good. The timing chain guides and tensioners are probably bad. This is a MAJOR operation on that engine. It is not simply a matter of changing a timing chain, guide, and tensioner set, but there are three timing chains on that engine, and none of the sprockets have keyways or timng marks on them. You have to use a set of special alignment and holding tools to align the chains and gears. As said there are three chains. There is a primary chain that is where the old push rod type engine used to be. That is connected to a gear that drives a jackshaft that goes through the middle of the engine and there is a gear on the other end at the rear of the engine block that attaches to a gear and drives another timing chain in the rear that runs the right bank overhead cam. Back in the front, we have a gear behind the jackshaft driving gear, that runs another chain that drives the left bank overhead camshaft. The only explanation I have is that this engine was designed by aliens.
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