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SportTrac Discussion
Engine & Drivetrain
4.0L SOHC Metal Reinforced Timing Chain Guides Possible?
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<blockquote data-quote="Dean Hedin" data-source="post: 1029654" data-attributes="member: 57230"><p>Even the old 2.9L had a plastic chain guide. Most chain guides on other vehicles are also plastic. In some cases there have been upgrades to the plastic guides, like early Jag XK8 that were often done under warranty. It's possible the 4.0 SOHC's guides have been improved in the aftermarket.</p><p></p><p></p><p></p><p>That's not the real problem with the SOHC.</p><p></p><p></p><p></p><p>The problem is, on the SOHC, there is "one in the back". So to replace requires an engine pull - and nobody wants to do that. Because labor wise you might as well just put a new motor in.</p><p></p><p></p><p></p><p>Let's say at 160K your guides are shot. Are you really going to pull the motor out , just put new chain guides in and put the motor back in? More than likely other things need attention, and when you add up the labor it is easier to just put a reman motor in.</p><p></p><p></p><p></p><p>The mechanic explains this to the customer and the customer wisely determines that they would rather put the money towards a new vehicle.</p><p></p><p></p><p></p><p>I don't think it is a case of direct planned obsolescence. It's just that they should have put one big timing chain on the front of the SOHC engine.</p><p></p><p></p><p></p><p>Now, in the case of my 1988 Merkur Scorpio (with the 2.9L) it is probably a Saturday job to pull the front cover off and replace the timing chain tensioner. There is something to be said for simplicity. But don't worry, my Merkur comes with it's own set of issues.</p></blockquote><p></p>
[QUOTE="Dean Hedin, post: 1029654, member: 57230"] Even the old 2.9L had a plastic chain guide. Most chain guides on other vehicles are also plastic. In some cases there have been upgrades to the plastic guides, like early Jag XK8 that were often done under warranty. It's possible the 4.0 SOHC's guides have been improved in the aftermarket. That's not the real problem with the SOHC. The problem is, on the SOHC, there is "one in the back". So to replace requires an engine pull - and nobody wants to do that. Because labor wise you might as well just put a new motor in. Let's say at 160K your guides are shot. Are you really going to pull the motor out , just put new chain guides in and put the motor back in? More than likely other things need attention, and when you add up the labor it is easier to just put a reman motor in. The mechanic explains this to the customer and the customer wisely determines that they would rather put the money towards a new vehicle. I don't think it is a case of direct planned obsolescence. It's just that they should have put one big timing chain on the front of the SOHC engine. Now, in the case of my 1988 Merkur Scorpio (with the 2.9L) it is probably a Saturday job to pull the front cover off and replace the timing chain tensioner. There is something to be said for simplicity. But don't worry, my Merkur comes with it's own set of issues. [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
4.0L SOHC Metal Reinforced Timing Chain Guides Possible?
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