Hi, here's an odd question:
I'm replacing the timing chain on my new to me '95 3.9 and figured I'd add a tensioner, seemed simple enough. Then I noticed the tensioner goes on the left side of the chain which, if my engine spins counterclockwise, isn't the slack side.
So, does the tensioner really go on the tight side of the chain (just doesn't seem right) or does the engine actually turn clockwise (which would mean my fan blades are on backwards)?
Please help

 

I cannot address your logic but when I did my 94 3.9 the tensioner went on the left to me looking at the motor. It is the only place it will fit and whatever instructions you are looking at should show you this.

 

Which way does your engine spin?

 

Doesn't really matter. It needs to take up the slack.

Consider an OHC motor; quite often the tensioner for the left head is on the left, and for the right head is on the right.

RwP

 

It just seems backwards to put the tensioner on the side that's trying to be tight. Wouldn't the tension of the chain under load just push the tensioner back?

 

I think the engine turns clockwise, when you are facing it from the front of the truck. The crank is what drives the chain, so the drivers side will be under tension. Passenger side is slack side.

 

That's what I was expecting but the fan says otherwise. When I look down at the top edge of the top fan blade it curves backwards towards the engine on the driver's side.

 

Mine runs clockwise when looking at the front of the motor. HOWEVER - the Serp belt motors use a reverse-rotation water pump; the fan blade rotation doesn't affect the CRANK rotation.

RwP

 

Doh that explains it. I feel better and a little stupid too.
Thanks for solving my non-issue

 

We love the easy ones.

No such thing as a stupid question here, if you don't already know the answer. That's what we're here for.