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Oil weeping from rear scavenge pump?

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7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

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YOUR RESEARCHOil weeping from rear scavenge pump?

Leading reported evidence

Replace o-ring itself

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed
The o-ring itself that seals pump to head and cover is still OK assuming it was replaced during the rebuild but the aluminium has probably oxidised so much that the surface it must seal against is too rough.
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Oil weeping from rear scavenge pump?

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Leading evidence: 'Replace o-ring itself' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace o-ring itself' (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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1 matching discussions · 7 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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Replace o-ring itself

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
The o-ring itself that seals pump to head and cover is still OK assuming it was replaced during the rebuild but the aluminium has probably oxidised so much that the surface it must seal against is too rough.
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Oil weeping from rear scavenge pump?

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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.

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

Rennlist: 1 discussions

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Generation: 20261026T052503Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

So I noticed I�ve got a little weep coming from the oil scavenge pump on the rear of the motor tonight. No puddles or anything under the car and it seems to be running fine. Pressures were normal at idle and under load when I had the car out. Car is a 2000 3.4 -> 3.8 build 6MT coupe with 83k miles and I have around 23k miles on the rebuild. Only other notable funny business was it threw a code for a bad catalytic converter two weeks ago which was cleared and has not returned. Car has its original exhaust and cats, so that kinda makes sense to me with how I drive it and the added displacement. Do the gaskets in these just go over time or should I be looking for bigger problems? Second photo is from behind the housing. Also it�s hard to see from the photo, but the orientation is correct with the 1-3 facing out towards the right wheel.

POST 2Original post

I believe I have the same issue on my 2000 C2 Cab. I notice that when I really step on the gas oil comes from that area and splashes onto the exhaust and smokes a bit. Oil pressures are fine. No smoke from the exhaust, just the burning splashes on the pipes under heavy acceleration.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 20732123

There�s no evidence of splashing on mine, you might be dealing with something else.

POST 4Original post

Mine may be further gone than yours? You really reviving it and it�s not worse? I bought mine that way so who know how long it�s been going on.

POST 5 / ORIGINAL POSTEROriginal post

Quotes source post: 20732151

Yeah, this car sees redline pulls just about every time I drive it.

POST 6Original post

Looks like the oil is weeping from between cam cover and cilinder head too. The o-ring itself that seals pump to head and cover is still OK assuming it was replaced during the rebuild but the aluminium has probably oxidised so much that the surface it must seal against is too rough.

POST 7 / ORIGINAL POSTEROriginal post

Quotes source post: 20732758

hmm you�re right. I looked again and it�s def coming from above the scavenge pump. Cleaned it up and drove it around a bunch today and it seems dry. Wonder if it could also be from one of the spark plug tubes?

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