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SN95 Cobras
Timing Chain Tensioner
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<blockquote data-quote="OCSnk" data-source="post: 6345613" data-attributes="member: 20042"><p>Found this on file hope this helps. Not my write-ups </p><p></p><p></p><p>Before you buy four tesioners and 32 valve tappets..$$$..Look in the direction of the passenger or driver side primary timing chain, usually its the passenger side one that dies if they die...To check the chain tension start by removing the valve covers or the valve cover where you isolated the noise and check the slack or tension in the chain..if there is some noticeable slack, your tensioner may have died..its always a good idea to pull both valve covers so you can compare...Also check the tension of the cam chain, Ive never seen a cam chain tensioner die, due to its non ratcheting design, but its possible the spring in the tensioner body could break..The lash adjusters are a bummer and do go bad, I found three bad tappets on the driver side head when I did a cam swap, which explained all the ticking prior to the cam swap. Upon removal the bad tappets, the plunger had absolutely no hydraulic pressure, you could actually actuate the plunger by shaking the tappet with your hand...You will have to remove the rockers (cam followers) to get to the valve tappets..you will have to remove valve covers to do this set the cam lobe at base circle and pop out the rockers that are at base circle and turn the crank to reset the remaining installed rockers at base circle and pop those rockers out, repeat this until all 32 or whatever head is producing the noise, so you may just have to pop out just 16..I use a flat head screwdriver to pop the rockers out and pop them back in.</p><p></p><p>If you find a bad cam chain tensioner in the head you’ll just have to pop the valve covers off but you'll have to pop the valve covers off anyway. If you have a bad timing chain tensioner the timing chain cover needs to be removed...Good-Luck...Duane V</p><p></p><p>=====================================================</p><p></p><p>Its the timing chain tensioner and it always seems its the passenger side one that fails ... What’s happening is the tensioner plunger doesnt pump up fully and the timing chain guide will bounce against the tensioner plunger, eventually it will get bad enough where the timing chain will start slapping against the chain guide...My advice change both the RH and LH timing chain tensioners, they are $70 each from Ford. All you have to do is remove the pulley accessories and timing chain cover, then remove the timing chain tensioner, submerge the new one in oil for about 30 seconds install it, torque down the two bolts to 22 ftlb, pull up on the timing chain guide and at the same time remove the plunger retaining pin from the tensioner body. Repeat this process on the driver side the only difference is you push down on the driver side timing chain guide...Its very easy to do...DA snake boy!!</p></blockquote><p></p>
[QUOTE="OCSnk, post: 6345613, member: 20042"] Found this on file hope this helps. Not my write-ups Before you buy four tesioners and 32 valve tappets..$$$..Look in the direction of the passenger or driver side primary timing chain, usually its the passenger side one that dies if they die...To check the chain tension start by removing the valve covers or the valve cover where you isolated the noise and check the slack or tension in the chain..if there is some noticeable slack, your tensioner may have died..its always a good idea to pull both valve covers so you can compare...Also check the tension of the cam chain, Ive never seen a cam chain tensioner die, due to its non ratcheting design, but its possible the spring in the tensioner body could break..The lash adjusters are a bummer and do go bad, I found three bad tappets on the driver side head when I did a cam swap, which explained all the ticking prior to the cam swap. Upon removal the bad tappets, the plunger had absolutely no hydraulic pressure, you could actually actuate the plunger by shaking the tappet with your hand...You will have to remove the rockers (cam followers) to get to the valve tappets..you will have to remove valve covers to do this set the cam lobe at base circle and pop out the rockers that are at base circle and turn the crank to reset the remaining installed rockers at base circle and pop those rockers out, repeat this until all 32 or whatever head is producing the noise, so you may just have to pop out just 16..I use a flat head screwdriver to pop the rockers out and pop them back in. If you find a bad cam chain tensioner in the head you’ll just have to pop the valve covers off but you'll have to pop the valve covers off anyway. If you have a bad timing chain tensioner the timing chain cover needs to be removed...Good-Luck...Duane V ===================================================== Its the timing chain tensioner and it always seems its the passenger side one that fails ... What’s happening is the tensioner plunger doesnt pump up fully and the timing chain guide will bounce against the tensioner plunger, eventually it will get bad enough where the timing chain will start slapping against the chain guide...My advice change both the RH and LH timing chain tensioners, they are $70 each from Ford. All you have to do is remove the pulley accessories and timing chain cover, then remove the timing chain tensioner, submerge the new one in oil for about 30 seconds install it, torque down the two bolts to 22 ftlb, pull up on the timing chain guide and at the same time remove the plunger retaining pin from the tensioner body. Repeat this process on the driver side the only difference is you push down on the driver side timing chain guide...Its very easy to do...DA snake boy!! [/QUOTE]
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