[DeTomaso] Cylinder Heads leaking

[Joseph F. Byrd, Jr.]

I Have lost track of who says what and the stated symptoms, but if it is
believed to be carbon on the valves (or even a ring not set), I recall my
Father use to drip water from a small Coke bottle with the throttled held
about 3K
Joe/NC

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Julian Kift
Sent: Friday, November 20, 2015 22:43 PM
To: Brian Dudley; sean mundy
Cc: mikeldrew at aol.com; detomaso at poca.com
Subject: Re: [DeTomaso] Cylinder Heads leaking

Following this thread, I would not be quite so quick to discount Mike Drew's
diagnosis; you said you had lot of carbon build up on the intake valves and
could feel air flow through the carb mount of the intake manifold with the
rockers removed, so where is that air escaping from? Is it possible the
carbon build up is enough to prevent the intake valve fully seating, it
isn't going to take a lot to get some significant leak down.

My other thought was bent intake valves, I over revved a ford 302 once
through a missed shift and very slightly bent all the intake valves, however
that would not explain the copious use of oil. I wonder if Mike's diagnosis
is not the root cause of oil getting into the cylinder and
carbonizing/coking up the intake valves, which are now not fully seating?

As you have the compression tester in hand I'd run a full compression test
first and determine whether this is a general issue or limited to certain
cylinders. I assume you have the rockers removed from both cylinders 7 & 8
and this not blow by from a bad head gasket from one cylinder to the other?

Good luck,
Julian

________________________________________
From: DeTomaso <detomaso-bounces at poca.com> on behalf of Brian Dudley
<bd8134 at gmail.com>
Sent: Friday, November 20, 2015 7:10 PM
To: sean mundy
Cc: mikeldrew at aol.com; detomaso at poca.com
Subject: Re: [DeTomaso] Cylinder Heads leaking

Have you tried the other cylinders?
Have you tried a compression test?
The leaking valves would not cause your bad oil consumption.
Unless the valve guides are badly worn.
A wrong pushrod length can cause the rocker to push against the valve stem
rather than push the valve down and quickly wear out the valve guide.
Was the engine smoking before you installed the heads?


On Fri, Nov 20, 2015 at 9:59 PM, sean mundy <seanmundy at hotmail.com> wrote:

> Autozone and Oreilly's don't have loaner tool leak down testers.  
> Harbor Freight has one for $40.
> It's starting to seem like my valves are leaking.  The engine only has 
> 4k miles since new.  Sad
>
> ------------------------------
> Date: Fri, 20 Nov 2015 21:51:07 -0500
> Subject: Re: [DeTomaso] Cylinder Heads leaking
> From: bd8134 at gmail.com
> To: byrdjf at embarqmail.com
> CC: seanmundy at hotmail.com; mikeldrew at aol.com; detomaso at poca.com
>
> Yep thats the style.
> Mine is similar to this one.
> http://www.amazon.com/OTC-5609-Cylinder-Leakage-Tester/dp/B0030EVL60
>
> On Fri, Nov 20, 2015 at 9:38 PM, Joseph F. Byrd, Jr. < 
> byrdjf at embarqmail.com> wrote:
>
> I had to google "leak down tester".  Basically making a flow meter.  
> The precision of the orifice effects the acceptable values
>
> -----Original Message-----
> From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of sean 
> mundy
> Sent: Friday, November 20, 2015 21:25 PM
> To: Brian Dudley
> Cc: mikeldrew at aol.com; detomaso at poca.com
> Subject: Re: [DeTomaso] Cylinder Heads leaking
>
> .... is that what you use for a leakdown test?
>
>
>
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