strangest engine problem ever!!!

twolo4u2c2 · Aug 25, 2010

pulled the plugs and the pass side cylinders all are black from oil. drivers side all look normal. TAKE YOUR BEST GUESS!!!!

i'm lost

thanks

jrichker · Aug 25, 2010

Check the oil return passages in the driver's side head. If the oil return passages clog or are obstructed, the oil will pile up the the valve cover and start to leak past the valve guides.

twolo4u2c2 · Aug 26, 2010

They are new heads....nothing blocked

will1992 · Aug 26, 2010

is it a new motor? when i rebuilt my engine i left some oil in the cylinders so nothing would rust in the bores and forgot about it and when i started it up the first time all the left over oil in the cylinders burned off making my plugs fouled, i had to clean them with some gas and a wire brush.

twolo4u2c2 · Aug 26, 2010

No...not new engine. Has about 30k on it...heads are new. Didn't smoke right away...the heads have about 1000 miles on them.

BlackGT89 · Aug 26, 2010

What's the history of the heads ? Are they fresh from the manufacturer or could they have changed hands a time or two ? Was any work done on the heads? At any rate I would call the place you bought them from or the manufacturer if they are still in waranty. Sounds like the valve seals / guides on one head have a problem.

twolo4u2c2 · Aug 26, 2010

Heads were brand new never used.
I have the heads pulled and both look the same seal wise..just the pass side cylinders are all black

jrichker · Aug 26, 2010

Keep in mind that 5.0 head gaskets don't have a top or bottom side. However, they do have Front stamped on the gasket. No matter which side you put the gasket on, the Front has to be in the front to keep from blocking passages.

twolo4u2c2 · Aug 26, 2010

I verified that first thing after removing the heads

BlackGT89 · Aug 27, 2010

Not to over simplify, but the oil either has to come from the heads down or from the pistons up. With that low of mileage it's not likely the oil came from the pistons up, especially one whole side and not the other. Just curious, what kind of heads ? At the risk of sounding repetitive I think I would call the company and send 'em back if there is any kind of waranty.

twolo4u2c2 · Aug 27, 2010

RHS 200 cast iron heads....I have pulled some springs and the seals are tight....could this come from the pcv system?

BlackGT89 · Aug 27, 2010

twolo4u2c2 said:
RHS 200 cast iron heads....I have pulled some springs and the seals are tight....could this come from the pcv system?

I suppose you're right, that could be another source, but unless you changed something to do with the PVC system would you not have had the same problem before ? Can you tell by looking at the oil path if it seems to be ahead of the valve guide area ? Did you keep the original valve covers and just remove the baffle ? Lots of people do that with no problems, but maybe some do have problems. Check your PVC screen and make sure it's not clogged (clean / replace as needed).

twolo4u2c2 · Aug 28, 2010

The changes made were heads and intake...everything else stayed the same. It didn't start right away....it very slowly started...and its only at idle...as soon as I rev it up and hold it up there there is no smoke.

Rick 91GT · Aug 28, 2010

Did you do a compression test or leakdown before you pulled the motor apart? Still could be the seals, guides etc and really wouldn't be uncommon.

Do a simple fluid test and put some rubbing alcohol down each port and see if it leaks past the valve. It is not a perfect test but would find a major head/seat issue quick, the proper way is to vacuum test each port to make sure it is not leaking past the seat.

What type of seals come of the RHS heads?

BlackGT89 · Aug 28, 2010

I didn't catch the new intake part until now. Did the new intake come with a baffle under the PVC valve area ? If not it could be sucking oil there through the PVC valve, and there would probably be oil in the intake. If it sucks oil at idle (when the vacuum is high) that is a strong indication that it's pulling oil past the valve seals.

v8only · Aug 28, 2010

run it with that valve cover off and see what it's doing.

twolo4u2c2 · Aug 31, 2010

FOUND THE PROBLEM...photos!!!!!

pulled the intake valves and look at all the oil i found under the seal...guides are worn a little.

Mustang5L5 · Aug 31, 2010

That's a brand new head?

BlackGT89 · Aug 31, 2010

Bingo !

There ya go. Are you going to try and send the heads back ? I'm curious what they will say. Be sure and check your rocker arm alignment and all of the valve geometry when you put it all back together.

twolo4u2c2 · Aug 31, 2010

I doubled checked the push rod length and you can see the wear pattern in the center of the valve...not sure why the guides are worn

strangest engine problem ever!!!

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