Here's what's going to happen next weekend (was supposed to happen this
weekend but I got called to Florida on business).
The Intake manifold is coming off and a 1/8" aluminum plate is being TIG
welded to the manifold to cover up the factory "screw-up".
I'll have pictures up probably by the 9th or 10th of next month.
- Bernd
BTW: Good reading...thanks.
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of mike d.
Sent: Wednesday, March 29, 2000 5:15 PM
To: dakota-truck@buffnet.net
Subject: DML: Fw: [DiRT] aluminum intake manifold + steel plate + hidden
gasket = sure trouble ?
long subject, but good readin'...
-mike d.
--------- Forwarded message ----------
From: "Henry LaViers" <hl4@worldnet.att.net>
To: "dirt" <DiRT@4x4wire.com>
Date: Wed, 29 Mar 2000 07:18:04 -0500
Subject: [DiRT] aluminum intake manifold + steel plate + hidden gasket =
sure trouble ?
Message-ID: <001501bf9978$d5f08c20$6b822581@duke.edu>
Here are three post from MoparChat that talk about the troublesome plenum
gasket that is below the Magnum engine's intake manifold.
The steel bottom plate, paper gasket, and aluminum intake manifold are
talked about in TSB 09-05-00 at;
http://www.ecpe.vt.edu/~dfritz/technical/TSB00/09-05-00.htm
The more I learn about the stock 'beer barrel' intake manifold used on
the
Magnum engines, the more I dislike the design. Note that all the older
LA
engines, the new 4.7V8 and the Viper V10 have intake manifold designs
without ANY underpan or gasket. Coincidence ?
I post this because i think the bit about the steel plate and the
aluminum
intake manifold do probably expand at different rates with temperature -
and
this is probably why the gasket keeps failing - like someone wisely
points
out below.
I also think it is possible that
_a little bit of detonation_
from cylinders 7 or 8 may be the
'straw that breaks the camels back'
of the gaskets located close by.
-HankL
(begin quotes)
----------
"The easiest way to tell if you have a blown plenum gasket is by pulling
the
air charge temperature sensor. This sensor is located directly behind the
alternator on the intake manifold. It takes a 3/4" long barrel socket, I
believe, to pull it out. Since only air is supposed to go through the
tunnel, the sensor should be dry.
{Hank's note: because the PCV hose of the stock factory system dumps oil
vapor mostly into the side that feeds cylinders 1,3,5, and 7 this is
true,
because the IAT is in cylinder #2}
If there is oil on the sensor, then I'll bet any amount of money that the
plenum gasket is blown. My colleagues and I believe the reason why the
plenum gasket blows is because the plenum cover is made of steel and the
intake is made of aluminum. Since steel expands differently when being
exposed to heat than aluminum, it doesn't take long for the plenum gasket
to
work it's way out."
--------------
(another poster comments)
"I am gearing up to do a plentum gasket swap. I think it is a pretty
stupid
idea who ever came up with it. You have 20 bolts facing the bottom of the
engine. hope none of them ever fall out! And then, you may have to
replace
it more than once!My father and I are gonna change his real soon. We are
thinking of welding an aluminum plate on the bottom. No gasket, no
problem.
"
----------------
(another poster comments)
"The plenum gasket is paper thin, I suspect either DC received a BUNCH of
gaskets with partial tears in them or they are being damaged during
engine
assembly. All it takes is a tear less than 1/16" !! and you've had it.
It sounds like an assembly or a defect in the gasket because its always
around #7 or #8 where the oil gets sucked in."
-------------------------------------
(end quotes)
Hank's note: Chrysler now recommends RTV be used instead of a paper
gasket.
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