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2004 Explorer 4.0. Timing chain tensioners.

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Old 05-16-2010, 02:13 PM   #1
cbexplore
saint Louis Missouri
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2004 Explorer 4.0. Timing chain tensioners.

I read through the forums here about replacing my rear timing chain tensioner, as I have the deadly rattle others have experienced. I replaced the passenger side rear tensioner (could not believe how easy that one was)
but I still have the rattle. I would like to replace any others tensioners required but didnt see specifics for the 2004 Explorer SOHC v6 4.0 4x4.
I need to determine how many my engine may have, where they are located, and how to replace them.
Thanks for any help.
CB
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Old 05-16-2010, 03:16 PM   #2
2000StreetRod
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2nd hydraulic tensioner

You should have another similar but longer hydraulic chain tensioner on the left head near the front on the inner side. On my 2000 the upper intake manifold must be removed. I'm not familiar enough with your intake manifold (which is different) to know if it must be removed. If your intake is like the one shown below I suspect it must be removed to access the tensioner.
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Old 05-18-2010, 11:38 AM   #3
cbexplore
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Thanks 2000StreetRod
I used your walk through to replace the other tensioner.
We have had some bad weather lately so I have been able to do anything.
The rattle does seem to have quieted some from the other replacement.
Hopefully the drivers side fixes it.
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Old 05-18-2010, 12:41 PM   #4
BrooklynBay
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Welcome to this forum! I've moved your thread into the stock 2002-2005 section.
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Old 05-24-2010, 06:19 PM   #5
cbexplore
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Thanks 2000StreetRod your accurate description led me right to the part.
Thankfully the engineers got smart and the 2004 V6 Explorer SOHC doesnt require manifold removal to get to it....its right in your face!...easy access with basic tools...I am changing it now and will post the results.
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Old 05-24-2010, 07:14 PM   #6
cbexplore
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Replaced the front tensioner ....still a slight rattle....but havent highway driven... I assume this means replacing the chains and guides?
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Old 06-01-2010, 08:54 AM   #7
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Dang Dang

Quote:
Originally Posted by cbexplore View Post
Replaced the front tensioner ....still a slight rattle....but havent highway driven... I assume this means replacing the chains and guides?
Well thought I could get a few more miles but now the engine is losing oil pressure to the top of the motor. I had a top end flush done on it but it didnt help. Pressure gage says all is well but the extremely loud dry noise says the ports or something is clogged and not getting oil.
Looks like 5,000.00 for a new motor is the only solution now.
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Old 06-01-2010, 11:53 AM   #8
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Pull the valve covers

Quote:
Originally Posted by cbexplore View Post
Well thought I could get a few more miles but now the engine is losing oil pressure to the top of the motor. I had a top end flush done on it but it didnt help. Pressure gage says all is well but the extremely loud dry noise says the ports or something is clogged and not getting oil.
Looks like 5,000.00 for a new motor is the only solution now.
If you've changed your engine oil and filter at the recommended intervals I doubt that you have an oil pressure problem. You're probably hearing timing chain rattle. If you remove the valve covers you can determine if the left and right chain guides are broken. Only a broken rear guide requires engine removal to repair.
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Old 06-01-2010, 12:30 PM   #9
cbexplore
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Originally Posted by 2000StreetRod View Post
If you've changed your engine oil and filter at the recommended intervals I doubt that you have an oil pressure problem. You're probably hearing timing chain rattle. If you remove the valve covers you can determine if the left and right chain guides are broken. Only a broken rear guide requires engine removal to repair.
Thanks 2000StreetRod its worth checking before I blow my savings
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