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Old 09-30-2024, 06:41 PM   #10
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Join Date: Sep 2018
Location: Laval QC
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Quote:
Originally Posted by JFP in PA View Post
I have a problem, particularly with single row engines, of replacing a bearing with a pretty well defined failure rate with brand new copy same thing; statisitically, you are still in the same probability of failure, so I don't see what you accomplished...
JFP, I should have mentioned that the bearing I replaced was a double row... all of my expieriece is with MY 2000 engines with double row bearings... except the replacement engine in my 2000 S which has a single row bearing that was replaced with a LN bearing. I totally agree, I would not replace a single row with the same bearing that came from the factory.

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."

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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Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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