New timing tensioner -- is it oil pressure activated?

[mountaineer2004]

Clean oil is the difference between a 150k mile sohc and a 300k mile sohc

I always changed my 2004 4.6 every 5K miles, and it's still running fine at 313k, so I believe you.

 

[Xlrick1969]

Until the tensioner receives pressurized oil the guide relies only on the spring to keep some load on the chain. This is why I always use a new OE chain that hasn’t stretched and a new OE tensioner whenever I replace the water pumps on these engines. This minimizes the amount of free play in the chain drive and it won’t jump a tooth (every engine goes down the production line this way). Was your new tensioner OE or aftermarket? The aftermarket doesn’t always reverse engineer their parts correctly.

It is OE

 

[Xlrick1969]

There are also “pre oilers” you can buy which prime the system
Or like some of us you can run manual tensioners that do not rely on oil pressure to pump up

Where did you get the manual tensioners?