hmmm, first line of this post got cut off.......
SOURCE: MoPar Performance News, Tech Tips, by Larry Shepard - Mopar Chief
Engineer
-----Original Message-----
From: mrdancer <mrdancer@camalott.com>
To: dakota-truck@buffnet.net <dakota-truck@buffnet.net>
Date: Saturday, February 20, 1999 3:31 PM
Subject: DML: Detonation / Pinging check & fix
>Engineer
>
>The problem is related to the gasket that seals the cover to the bottom of
>the manifold on the Magnum engines. If this gasket does not seal properly,
>the engine can suck in oil vapors from the lifter valley and cause the
>engine to detonate due to the aggressive spark advance curve used in the
>Magnum computers. Remembering where this gasket is located, this is not
the
>first thing that you want to do. It could be expensive and time consuming
>to pull off the intake to check. However, we have a helpful tip. To
>determine if there is a proper seal, remove the PCV (Positive Crankcase
>Ventilation) valve from the right hand valve cover, but leave the PCV valve
>attached to the hose from the intake manifold. Remove the breather hose
>from the left-hand valve cover that goes to the air cleaner. Plug-off the
>connection at the valve cover. With the engine idling, place your thumb
>over the opening where the PCV valve was located. After 10-15 seconds you
>should feel pressure, which indicates that the gasket is sealing. If you
>feel a vacuum, the gasket is leaking and needs to be repaired. The best
>repair is to remove the intake manifold, remove the bottom plate and
discard
>the failed or leaking gasket. Clean all the surfaces thoroughly, and apply
>a bead of Mopar RTV sealant, PN 82300235 to the bottom of the manifold.
>Re-install the plate, let dry and then re-install the manifold. Refer to
>the service manual for manifold installation tips and details.
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