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Advice swapping corroded 4.0 cams


Nagi636

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Hey guys I recently bought a 4.0 with 67k miles to replace my original 2006 with 220k miles that chewed up a failed chain guide. The new motor is in good condition but the cam lobes are corroded from sitting even with the anticorrosion spray they applied. Its much worse on the driver side where the oil fill was located on the original cover. Can I swap the cams from the old motor? If so do I need to replace the rollers? I appreciate any recommendations, Thanks!
67563

This Is the cam in the new engine
 


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Uncle Gump

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That is a damn shame...

I think what I would do is ask the company you bought the used engine from on what they suggest you do.
 

holyford86

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if you've got pitting and corrosion that bad on the cams, chances are water has gotten into other places too, if it was me I'd be looking for another engine, honestly. But if you're dead set on using the low mileage engine I'd be yanking the oil pan and all of the plugs and inspecting really good. Personal opinion is I'd rather have a higher mileage engine that was well maintained than an internally rusty low mileage one.
 

Nagi636

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Thanks! I pulled the upper and lower oil pan and everything is clean from rust and with little if any sludge I also looked around with a borescope and thankfully valves and cylinder walls are in good shape too. I guess I can accept that as being lucky these days. Considering everything else looks fine I went ahead and ordered two new cams from my ford service center. The place I bought the engine from offered a return for refund If I pay $350 for shipping. The new cams were only $286 so It was a little cheaper but more importantly for me its much faster than waiting for a refund and getting a replacement.
 

G8orFord

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Just the right size to touch the ground.
I'm probably too late, but I'd recommend getting new gear bolts too. Might not be a bad idea to replace the oil lines either. At least clean them up good. Could be some internal corrosion that might clog one of the oiling holes.

Also, not sure if you know it or not, but setting the timing on the 4.0 SOHC requires some special tools and attention to detail.
 


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