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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 05-28-2015
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Oil Leak

I have an oil leak coming from the rear of my '04 4.0. Before I pull the transmission to fix whatever it is, where are some common oil leaks at the rear of the 4.0 SOHC?
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Old 05-28-2015
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Take a look at your valve covers first. With age the seals get hard and don't seal as well. They can leak down the side and back to make it look like a leak at the rear. I had to replace my right side valve cover seal and the left will probably need it before too long.
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Old 05-31-2015
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I think I have found the culprit and it isn't the rear of the motor at all.

There is a good size bolt going into the head above the passenger rear spark plug. I think this is the source of the leak. I assume this is something for the cam chains.

Is there a gasket or copper washer that goes on this bolt?
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Old 05-31-2015
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The oil leak is definitely coming from the passenger timing chain tensioner. I'm going to see what the tensioner cost from the dealership and see what a local shop would charge to fix it.
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