Quote:
Originally Posted by elgyqc
LoneWolfGal, JFP makes the following point in the thread I linked to in previous post...
"5) The oil level only normally reaches the bearing level when the engine is not running; people fail to realize how far down the sump level drops with the engine running, particularly if it is running hard. Porsche put oil scavenging pumps in the cylinder heads for a reason: To get the excess oil trapped in the heads back down to the sump to keep the sump oil pump pickup covered. We actually tested this idea many years ago during an engine dyno test by drilling the case on a track car engine and installing barbed fittings with a clear hose in between them so we could see the oil level at various RPM levels. The oil level drops almost immediately after the engine starts and drops way more when the RPM levels go up. Even under modest engine speeds, the oil level is below the IMS bearing, so removing the rear seal allows oil mist in, not liquid oil."
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Logical. Surely LN would be aware of that, but in the statement I quoted it didn't seem to be a concern.
Quote:
Later on in the same thread he says...
"We remove the rear seals on the oversized non-serviceable IMS bearings any time we have reason to be in there, or when customer's request it; been doing it for years without any issues."
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Another $400 for the rear main seal. I will of course inspect my new engine's rear seal for evidence it leaked, but I have to assume on an engine with 39K the seal's just fine.