Hello All
I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine?
Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there.
Thanks
Mike

On Fri, 19 Dec 2003 23:32:22 UTC "Mikes_XJ" <mdufour (AT) iwon (DOT) com> wrote:

Before you get into expensive fixes (it could be a head gasket) check
the CCV system. If the crankcase isn't breathing right, you will
force oil out every seal at high RPM as pressure builds in the
crankcase. BTDT. If it's speed sensitive, that's the first place I
would look. It may well be as simple as removing the valve cover to
clean the breather and CCV ports. Pull the CCV line (rear of valve
cover) and make sure it's clear. Dont forget the port where it plugs
into the intake manifold. Check the breather tube to the airbox (mine
got plugged when it collapsed and shut off flow, but the 88 had a 180
degree bend that was prone to such nonsense). Once you have
eliminated the simple things you can start to think head gasket. Oh,
and I had a timing cover bolt work loose near the top and it did the
same thing but blew the oil back along the head just like a gasket
leak. After a long road trip it would sit there and just drip.

--
Will Honea <whonea (AT) codenet (DOT) net>

Hi Mike,
More than likely the orafice is clogged where it enters the intake
manifold, cause normal blowby to force oil out everywhere. I'd convert
it over to a Positive Crankcase Ventilation by drilling our the orafice
and adding the valve as pictured at:
http://home.sprynet.com/~dale02/vac-pcv.htm
God Bless America, ßill O|||||||O
mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/

Mikes_XJ wrote:

It shouldn't be the head gasket, because since it does not have an overhead
camshaft, it really doesn't have high oil pressure going through the gasket.
The oil reaches the upper head area through the pushrods and then drains
back through the head's drain holes.

Where is this oil, front or rear or passenger side?
Common leaks are from the oil filter housing or the oil pressure sending
unit.

Of course I could be mistaken. :-)
--
later,
dave
88 XJ 4.0 auto
82 Wag Ltd. 360 auto (to be retired!) anyone interested, whole or parts?
88 FSJ-GW 360 auto (GRAND 88)
Chicago

"Mikes_XJ" <mdufour (AT) iwon (DOT) com> wrote

it leaks like a siv. I washed down the engine and then drove it around for a
couple miles. When I poped the hood it looks like the oil is comming from
the head gasket, not the valve cover. Is this tipical on this engine?

Thanks, Ill have to check that out before I tare my engine appart.
Mike

You are not mistaken about the oil flow:
http://www.billhughes.com/oilgalle.jpg
God Bless America, ßill O|||||||O
mailto:LWHughes3rd (AT) aol (DOT) com

Dave wrote:

Bill\Dave

I took your picture and Marked the area. It is above and behind the Oil filter. After washing the engine down and runnning for a while this is where the oil shows up.
Now I realize you cant attach files?.... Any way it shows up in the gasket seam at the rear of the Passenger side of the engine, say the last 6 inches. This is about 4in higher than the oil filter. I did replace the oil sender about a year ago. Mabe Ill get some DYE and a UV light to be sure before I tare this thing apart...

Thanks for the imput
Mike

Send the picture to the address in my signature, if you like.
God Bless America, ßill O|||||||O
mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/

Mikes_XJ wrote: