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4.0 Head Gasket Oil Leak



 
 
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  #1  
Old December 22nd 04, 01:08 AM
DougW
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Posts: n/a
Default 4.0 Head Gasket Oil Leak

Matt Osborn did pass the time by typing:
> My dealer showed me an oil leak along the passenger side of the engine
> and said my head gasket needed to be replaced. He also said that DC
> had redesigned the head gasket to prevent these leaks fro the oil
> galleys.
>
> My 2000 TJ has just over 98K miles and I switched to Mobil 1 for the
> first time about two weeks ago. A google search turned up evidence of
> this leak as a common problem, but most decided to ignore it as the
> leak wasn't severe.
>
> Anybody know the true story here?


Just to clarify something. There is a valve cover gasket and
a head gasket. Odds of the head gasket needing replaced because
of an oil leak is about as close to zero as you can get.

What you have is a small leak from the valve cover gasket that's
running back and down the side of your engine. Just like mine does.

A full synthetic will find holes regular dino won't. I'd just wipe
the engine side and watch for where the leak is. If your not getting
drips on the driveway I'd ignore it.

--
-- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
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  #2  
Old December 22nd 04, 02:23 AM
Mike Romain
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Default

Is it a seep or a leak?

A seep makes a mark and is quite normal, a leak drips.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Matt, Osborn wrote:
>
> My dealer showed me an oil leak along the passenger side of the engine
> and said my head gasket needed to be replaced. He also said that DC
> had redesigned the head gasket to prevent these leaks fro the oil
> galleys.
>
> My 2000 TJ has just over 98K miles and I switched to Mobil 1 for the
> first time about two weeks ago. A google search turned up evidence of
> this leak as a common problem, but most decided to ignore it as the
> leak wasn't severe.
>
> Anybody know the true story here?

  #3  
Old December 22nd 04, 02:32 AM
L.W.(ßill) Hughes III
external usenet poster
 
Posts: n/a
Default

Hi Matt,
Your rockers are lubricated via the lifters, and hollow push rods:
http://www.billhughes.com/oilgalle.jpg
God Bless America, ßill O|||||||O


Matt, Osborn wrote:
>
> That's what I thought as well, The google search turned up reports
> about the galleys feeding oil to the valves were under high pressure
> and that the head gasket was susceptible to the leak.
>
> I'll take your advice and keep a close eye on it.

  #4  
Old December 22nd 04, 02:54 AM
Eric
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Posts: n/a
Default

I had a Stealth that I started using Mobil 1 in at about 65k miles. Found
all sorts of holes that conventional oil didn't. Ended up needing just
about every gasket replaced. Dealer quote: $1300 for rebuilding the engine
with new gaskets and old parts. No way.

Eric
99 TJ SE
<Matt Osborn> wrote in message
...
> My dealer showed me an oil leak along the passenger side of the engine
> and said my head gasket needed to be replaced. He also said that DC
> had redesigned the head gasket to prevent these leaks fro the oil
> galleys.
>
> My 2000 TJ has just over 98K miles and I switched to Mobil 1 for the
> first time about two weeks ago. A google search turned up evidence of
> this leak as a common problem, but most decided to ignore it as the
> leak wasn't severe.
>
> Anybody know the true story here?



  #5  
Old December 22nd 04, 04:51 AM
Lon
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Posts: n/a
Default

Matt Osborn proclaimed:

> My dealer showed me an oil leak along the passenger side of the engine
> and said my head gasket needed to be replaced. He also said that DC
> had redesigned the head gasket to prevent these leaks fro the oil
> galleys.


?!!!?!! If the dealer really is trying to sell you a new head gasket
run, do not walk, to another dealer. The engine is infamous for
leaking valve cover gaskets, easily fixed but expensive with dealer
parts and labor.
>
> My 2000 TJ has just over 98K miles and I switched to Mobil 1 for the
> first time about two weeks ago. A google search turned up evidence of
> this leak as a common problem, but most decided to ignore it as the
> leak wasn't severe.


You might want to try a few capfuls of Marvel Mystery oil in your
crankcase to help. Or switch to a different brand of synthetic or
even a synth blend. At 98K miles however, surprised you haven't
noticed a bit of leakage from the valve cover before.

  #6  
Old December 22nd 04, 04:15 PM
Lee Ayrton
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Posts: n/a
Default


So I have to ask: If the synthetic oil makes the engine leak, what would
be the reason for switching?


On Wed, 22 Dec 2004, Eric wrote:

> I had a Stealth that I started using Mobil 1 in at about 65k miles. Found
> all sorts of holes that conventional oil didn't. Ended up needing just
> about every gasket replaced. Dealer quote: $1300 for rebuilding the engine
> with new gaskets and old parts. No way.
>
> Eric
> 99 TJ SE
> <Matt Osborn> wrote in message
> ...
>> My dealer showed me an oil leak along the passenger side of the engine
>> and said my head gasket needed to be replaced. He also said that DC
>> had redesigned the head gasket to prevent these leaks fro the oil
>> galleys.
>>
>> My 2000 TJ has just over 98K miles and I switched to Mobil 1 for the
>> first time about two weeks ago. A google search turned up evidence of
>> this leak as a common problem, but most decided to ignore it as the
>> leak wasn't severe.
>>
>> Anybody know the true story here?

>
>
>


--
"A thousand ghost cows roar with laughter."
Anthony McCafferty explains urban planning in AFU.

  #7  
Old December 22nd 04, 05:04 PM
L.W.(ßill) Hughes III
external usenet poster
 
Posts: n/a
Default

It has gone through a couple of more steps in refinement, therefore
a better lubricate. But I have no problem with Pennzoil 20/50 in my old
cars with over three hundreds thousand, no sludge, not even a brown
tarnish on the oil filler caps or Positive Crankcase Ventilation valves.
God Bless America, ßill O|||||||O
http://www.billhughes.com/

Lee Ayrton wrote:
>
> So I have to ask: If the synthetic oil makes the engine leak, what would
> be the reason for switching?
> --
> "A thousand ghost cows roar with laughter."
> Anthony McCafferty explains urban planning in AFU.

  #8  
Old December 22nd 04, 05:05 PM
Mike Romain
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Posts: n/a
Default

The sales droids have folks convinced it 'must' be better because it is
'synthetic' and costs 4 times as much.

They forget to mention that the word 'synthetic' means absolutely
'Nothing' legally so they can use the regular old oil add a chemical or
tweak a chemical and charge 4 times extra by putting the name
'synthetic' on it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Lee Ayrton wrote:
>
> So I have to ask: If the synthetic oil makes the engine leak, what would
> be the reason for switching?
>
> On Wed, 22 Dec 2004, Eric wrote:
>
> > I had a Stealth that I started using Mobil 1 in at about 65k miles. Found
> > all sorts of holes that conventional oil didn't. Ended up needing just
> > about every gasket replaced. Dealer quote: $1300 for rebuilding the engine
> > with new gaskets and old parts. No way.
> >
> > Eric
> > 99 TJ SE
> > <Matt Osborn> wrote in message
> > ...
> >> My dealer showed me an oil leak along the passenger side of the engine
> >> and said my head gasket needed to be replaced. He also said that DC
> >> had redesigned the head gasket to prevent these leaks fro the oil
> >> galleys.
> >>
> >> My 2000 TJ has just over 98K miles and I switched to Mobil 1 for the
> >> first time about two weeks ago. A google search turned up evidence of
> >> this leak as a common problem, but most decided to ignore it as the
> >> leak wasn't severe.
> >>
> >> Anybody know the true story here?

> >
> >
> >

>
> --
> "A thousand ghost cows roar with laughter."
> Anthony McCafferty explains urban planning in AFU.

  #9  
Old December 23rd 04, 02:42 AM
Eric
external usenet poster
 
Posts: n/a
Default

Switching is fine if you do it early on. And only do it if you really need
to. For example, back home in Alaska, when it would get really cold out
normal oil would be sludge when sythetic would still pour. Thus, when you
started your engine oil was actually circulating instead of sitting in a
ball in your oil pan.

Of course if you switch later on in the engine's life, it may find all those
holes that were previously plugged up.

Eric
"Lee Ayrton" > wrote in message
x.com...
>
> So I have to ask: If the synthetic oil makes the engine leak, what would
> be the reason for switching?
>
>
> On Wed, 22 Dec 2004, Eric wrote:
>
>> I had a Stealth that I started using Mobil 1 in at about 65k miles.
>> Found
>> all sorts of holes that conventional oil didn't. Ended up needing just
>> about every gasket replaced. Dealer quote: $1300 for rebuilding the
>> engine
>> with new gaskets and old parts. No way.
>>
>> Eric
>> 99 TJ SE
>> <Matt Osborn> wrote in message
>> ...
>>> My dealer showed me an oil leak along the passenger side of the engine
>>> and said my head gasket needed to be replaced. He also said that DC
>>> had redesigned the head gasket to prevent these leaks fro the oil
>>> galleys.
>>>
>>> My 2000 TJ has just over 98K miles and I switched to Mobil 1 for the
>>> first time about two weeks ago. A google search turned up evidence of
>>> this leak as a common problem, but most decided to ignore it as the
>>> leak wasn't severe.
>>>
>>> Anybody know the true story here?

>>
>>
>>

>
> --
> "A thousand ghost cows roar with laughter."
> Anthony McCafferty explains urban planning in AFU.
>



 




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