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Yellow-ish/tan deposits/film around oil scavenge pump mating surface

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHYellow-ish/tan deposits/film around oil scavenge pump mating surface

Leading reported evidence

Use oil analysis reports identified nothing abnormal

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Performed · outcome unconfirmed · Original poster

My two used oil analysis reports identified nothing abnormal, so I'm guessing this "stuff" isn't anywhere else.

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Yellow-ish/tan deposits/film around oil scavenge pump mating surface
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Leading evidence: 'Use oil analysis reports identified nothing abnormal' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use oil analysis reports identified nothing abnormal' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Use oil analysis reports identified nothing abnormal

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

My two used oil analysis reports identified nothing abnormal, so I'm guessing this "stuff" isn't anywhere else.

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Yellow-ish/tan deposits/film around oil scavenge pump mating surface
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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

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Generation: 20261026T120458Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I'm refreshing my 130k-mile '99 C2 (UOAS, fuel injectors, etc.). Today I pulled the bank 1 oil return/scavenge pump. The bank 2 pump came off easily, but bank 1 seemed tighter. When I finally got it removed, I found dried yellow/tan deposits and film around the mating surfaces. Bank 2 was completely clean. My two used oil analysis reports identified nothing abnormal, so I'm guessing this "stuff" isn't anywhere else. Does anyone have thoughts on what this is or might be? Any precautions I should take besides scraping/cleaning it off and reinstalling the pump? (None of this stuff is inside the pump itself.)

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 18993747

The pumps are not supposed to have Loctite there -- just the o-ring... correct? I dismantled the pump to be sure none of the gasket material was present. Is this scoring of any concern?

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