03 explorer 4.0

[Bob the bridge guy]

I have a high mileage 4.0, well cared for, but rolled the vehicle. Found another explorer just like it with a bad engine. Started making the swap, but heard these engines have trouble with timing. What should I do while my engine is ou

 

[Tech By Trade]

Pop the valve covers and make sure the guides/cassettes are intact.

 

[Bob the bridge guy]

I get a little time every weekend to work on this project. I have bothe engines out now. I decided to open the valve covers on the bad one 1st. The back chain is rubbing directly on a pin and has likely jumped. On the other side the back spring is broken and no sign of the retainer. Turned the engine over by hand covering one plug hole at a time with my finger and could only get a hiss, hint of compression on 3 cylinders. I think the seller was correct in his assessment that the engine was bad.

 

[sfhess]

Change the timing chain cassettes and guides while you have the engine out. Also the tensioners.

 

[Bob the bridge guy]

Change the timing chain cassettes and guides while you have the engine out. Also the tensioners.

Thanks I went ahead and ordered all that. Now I need to order the gaskets and the yield to torque bolts too