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<blockquote data-quote="swshawaii" data-source="post: 1037478" data-attributes="member: 67547"><p>Duncan, most reliable sources recommend timing chain hydraulic tensioner replacement around 70,000 to 80,000 miles. Rear is Ford 7U3Z-6K254-<strong>A </strong>and front is 7U3Z-6K254-<strong>B</strong>. Consensus is to spend a little more money and only use OE Ford replacements. I've read about issues even using reputable aftermarket brands such as Cloyes and Borg Warner. Also order the XU2Z-6M252-A crush washers because they are not included with the OE tensioners. Regarding priming, I did not and held the accelerator to the floor while cranking the starter until the "idiot" oil pressure light went off. Also tripped the inertia switch just in case it fired to prevent over revving. Start threading by hand, and make sure the washer is PERFECTLY centered to prevent leaking. Torque seems to vary because of leaking, but factory spec is 32 foot pounds using new crush washers, or 49 ft/lbs. when re-using the washers. Regarding the front tensioner, I averted disaster last week by only REMOVING mine. I'll start a separate thread with lot's of pics since I emailed Eddie who is also interested. Good luck.</p></blockquote><p></p>
[QUOTE="swshawaii, post: 1037478, member: 67547"] Duncan, most reliable sources recommend timing chain hydraulic tensioner replacement around 70,000 to 80,000 miles. Rear is Ford 7U3Z-6K254-[B]A [/B]and front is 7U3Z-6K254-[B]B[/B]. Consensus is to spend a little more money and only use OE Ford replacements. I've read about issues even using reputable aftermarket brands such as Cloyes and Borg Warner. Also order the XU2Z-6M252-A crush washers because they are not included with the OE tensioners. Regarding priming, I did not and held the accelerator to the floor while cranking the starter until the "idiot" oil pressure light went off. Also tripped the inertia switch just in case it fired to prevent over revving. Start threading by hand, and make sure the washer is PERFECTLY centered to prevent leaking. Torque seems to vary because of leaking, but factory spec is 32 foot pounds using new crush washers, or 49 ft/lbs. when re-using the washers. Regarding the front tensioner, I averted disaster last week by only REMOVING mine. I'll start a separate thread with lot's of pics since I emailed Eddie who is also interested. Good luck. [/QUOTE]
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