have 4.2l RR Classic New heads recently, check or replaced all hoses (vac). Will go through a 1 quart of in a 100 miles or less. No oil on spark plugs. Really smokes bad over 2.5 grand. any help Thanks

 

If smoke is out the rear view mirror, as opposed to only out the tail pipe, could be external gasket leak on to exhaust. If coming from under the vehicle it may leave spots on rear door and glass. If out the tail pipe that sorta narrows it down to the head gaskets or exhaust valve seals/guides. Should not be rings, since you don't see it on plugs. Compression test to locate faulty valve (tells you which side, obviously we can't open just one cyclinder ). If a commercial shop did the work, there should be some sort of warranty?

Valve cover gaskets need snugging up? PCV (american name for it) system plugged up (my Disco has a squiggley piece of plastic baffle in the valve cover that if clogged is supposed to make oil come out elsewhere).

Don't forget to check oil cooler/oil cooler lines if so equipped. You could have an oil leak AND problems from something else at higher rpm.

Reason I mention exterior leak is that I had one when first got mine, was doing about 75, saw smoke, feared the worst, slowed down, it went away, found leak.

 

its very common for these to leak. if your only having the problem above 2500 its related to the higher oil pressure than you get at idle. if its just out the tailpipe it could be the pcv system, valve seal (were these done with the heads?) , could be rings, or head gasket kinked during installation as well...

 

If rings, would that show up as fouling on the plugs? Lotta oil going somewhere. I have a Mercedes that used to go through 1 quart every 500 mles with an external leak from valve covers, HG, and the O-ring on the oil level float switch (yep, they have a light that turns on when you are a quart low). Doing that in a hundred miles would have to leave a trail down the driveway to the Ponderosa.

Was hoping not rings so if he had any warranty issue on the HG it might be covered.

 

Rings will not necessarily foul plugs... if its cylinder wall splash it will just burn blue from the tailpipe... leakdown test should show rings ... anything with the head should be warrentied though if done by a professional... so start your checks there...

 

Thanks all for your in put. Today we took valve cover off checked compression, the compression was good but putting air in cylinders just went right into crankcase not good. Anyway ring are bad compression good at low rpms. Will just have to drive until it quits.

 

will be sooner rther than later if you ignore bad rings...