[DeTomaso] Cylinder Heads leaking

[Larry - Ohio Time]

Hi Sean,

If you hear air around the carb it is the intake valve leaking.
If you hear air around the exhaust it is the exhaust valve leaking.
If you see air in the radiator it is a crack or head gasket.
If you hear air around the crank case it is the rings.

You should bring the piston up to top dead center and lock the flywheel down
and test it that way as the rings may seal better on top of the bore.

Larry (uses a leak down tester) - Cleveland





-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of sean mundy
Sent: Friday, November 20, 2015 8:03 PM
To: mark skwarek; mikeldrew at aol.com
Cc: detomaso at poca.com
Subject: Re: [DeTomaso] Cylinder Heads leaking

I tried pumping air into 7 and 8 spark plug holes and both I can hear air
leaking.  I have all my rockers removed on that side so all the valves
should be closed.  I've tried a few different types of gaskets but buying
the CHI specific ones seemed to be the best approach.  They fit perfect so I
hoped my valve seals were the problem especially since there is a lot of
blue smoke on startup after the car has been sitting awhile.  I re torqued
the heads thinking the air leak could only be either the valves or a leaking
head gasket.  I have no signs of coolant in my oil.  Maybe I have multiple
problems ?
 
Date: Sat, 21 Nov 2015 00:52:12 +0000
From: ehpantera at yahoo.com
To: seanmundy at hotmail.com; mikeldrew at aol.com
CC: detomaso at poca.com
Subject: Re: [DeTomaso] Cylinder Heads leaking

I just buy a roll of gasket material and cut my own. Never any leaks and
easy to do.Mark 


    On Friday, November 20, 2015 7:30 PM, sean mundy <seanmundy at hotmail.com>
wrote:
  

    Thank you Mike.  That explains a possible oil leak being sucked in via
a leak but that wouldn't account for me hearing air leaking when   pumping
air into the cylinder with both valves closed?   I have CHI   heads and CHI
intake and I'm using their specific intake gasket set. I   don't think the
stock gasket is going to match up all that well.   > CC: detomaso at poca.com
> From: MikeLDrew at aol.com   > Subject: Re: [DeTomaso] Cylinder Heads leaking
> Date: Fri, 20 Nov 2015 16:12:19 -0800   > To: seanmundy at hotmail.com   >
> Sean,   >   > This is a VERY common problem. Your intake manifold gasket
has failed   and is leaking on the bottom edge, allowing oil to be sucked
from the   valley under the intake into one or more cylinders.   >   > Many
people have made the mistake of using Fel-Pro 'Print-o-seal'   intake
gaskets. These things are notorious for failing; so much so that   you can
find numerous references to them on Internet forums for all   sorts of cars,
where they are commonly called 'Print-o-leak' gaskets!   >   > I happen to
favor the stock-style valley pan gasket, Fel pro MS96012.   If you follow
the installation instructions to the letter, these seal   fine with the
added advantage of cooling the underside of the intake by   shielding it
from oil splash.   >   > There is a story with photos about this chronic
problem in a recent   PCNC newsletter; you can read it by accessing the
website at   www.panteraclubnorcal.com   >   > I've helped repair two local
cars with this problem in the past few   months and know of a third that is
awaiting repair....   >   > Mike   >   >   >   > Sent from my iPhone   >   >
On Nov 20, 2015, at 15:42, sean mundy <seanmundy at hotmail.com> wrote:   >   >
> After a long hiatus, I am back working on my Pantera. Latest issue   is
> > the engine is burning oil at about a quart every 300 miles.   > > My
spark plugs don't look horrible but something is going on. I re   > >
torqued the cylinder heads and intake manifold and made sure my pc   > >
valve was working. I looked at my intake valves with an   > > inspection
camera and there is a lot of carbon buildup but I only   have   > > about 2k
miles on the new aluminum heads. I thought my valve seals   may   > > be
leaking so I started removing the rockers on one side and tried   to   > >
replace the Teflon valve seals on #8cyl with new Comp Cam Viton   seals.   >
> I connected compressed air to the #8 spark plug hole to hold the   valve
> > up so I could remove the spring. I don't think you are supposed to   > >
but I can hear air leaking from somewhere inside the engine. It   seems   >
> like I can feel a little air coming out of the top of the intake   > >
manifold with my carb removed. I can't trace the air leak.   > > Need some
tips on what steps I should take at this point. Thanks,   Sean   > >
_______________________________________________   > >   > > Detomaso Forum
Managed by POCA   > > Posted emails must not exceed 1.5 Megabytes   > >
DeTomaso mailing list   > > DeTomaso at poca.com   > >
http://poca.com/mailman/listinfo/detomaso_poca.com   > >   > > To manage
your subscription (change email address, unsubscribe,   etc.) use the links
above.
_______________________________________________Detomaso Forum Managed by
POCAPosted emails must not exceed 1.5 MegabytesDeTomaso mailing
listDeTomaso at poca.comhttp://poca.com/mailman/listinfo/detomaso_poca.comTo
manage your subscription (change email address, unsubscribe, etc.) use the
links above.