4.0l Mercury Mountaneer burning oil like a SAVAGE!!!

[Iexplomo]

HI guys Im new to the explorer forum but im not new in the game. I recently bought a 2004 MERC 4.0 for my wife. while she was cruising without warning it started to bellow out smoke, burning oil. NO OVERHEAT, NO CEL!!! I had it towed to my local mechanic and he said the timing chain skipped a tooth and a valve popped a hole in the piston. I dont believe his diagnosis... The engine is running smooth but is smoking like crazy. The number 3 cyl is the one he diagnosed as being the problem has 145psi of compression on my gauge. any help would be appreciated guys. It only has 99k and i bought it from my inlaws and they are super **** about service and maint.... i hate to believe that this engine is toast

 

[Tech By Trade]

Believe. Every 4.0SOHC is a time bomb waiting to explode.

 

[Iexplomo]

I was just messing with it, its really bad..... I need a car asap so its off to the dealer i go.... I think something with a bow-tie will be in my near future.

 

[2000StreetRod]

slipped chain

If the timing chain for bank 1 slipped all cylinders on that bank should have reduced compression. If a valve stuck open instead of the chain slipping then only one cylinder would have low compression. I suggest that you check the compression on cylinders 1 and 2 for comparison with 3.

 

[drdoom]

A bow tie! Lame!

 

[Number4]

If you pop the valve cover I d suspect you'd find a bent valve stem. Or something visual.

 

[Tyleryac]

It would be best to get a new motor. Don't make the mistake I made and just repair the chains...

 

[Tech By Trade]

Street rod is right, especialy if it isnt noisy and still runs smooth. Oil has to be coming from somewhere. 145 is quite high for a valve stuck open though.