![]() This is not really a simple yes or no question. What we're talking about here is a very specific recommendation by the manufacturer for your specific vehicle. If you don't, just keep rolling the dice.Īlso remember, the oil companies advice is a very broad generalization and it's meant to make thier products more attractive to prospective buyers (advertizing hype). That is, if you want to keep the same engine going. The 2.7 has a chain that's got to be about 8 feet long from end to end! This, combined with the fact that it's an interference design, that it eats away the guides (normal wear and tear, it's designed this way) and the tensioner is esentially a hydraulic lifter that plugs with varnish over time, means you should follow the recommended change interval by the manufacturer. They also didn't run on tensioners and guides like the 2.7 does. When engines had a chain about a foot long and were non-interference designed, stretch was something that could be mostly ignored. The issue with the 2.7 chain is that it is so long, the stretch is magnified. ![]() The gears also wear with the chain, which just makes things even worse. the chain may slip a tooth or two or outright break from this "whipping" and excess movement. Result? The chain will whip around as it becomes too long for the tensioner and guide plates to compensate. the chain gets longer in tension because of the cumulative play in the rollers and links. But when you have anywhere from 200-400 links (maybe more in the 2.7, never counted), the cumulative play adds up to what most people call stretch. The holes in the plates that the rollers reside in also develop play. What happens is the rollers develope play with normal use. ![]() each link is composed of plates and rollers. *Definition of timing chain "stretch"- The chain does not actually "stretch". The timing chain on all engines has a maintenance interval no matter what you're read or been told.Ĭhains "stretch" over time and will eventually skip a tooth or two.
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