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YOUR RESEARCHStill finding plastic in oil after chain guide replacement
Leading reported evidence
Replace scavenge pump, deviation dropped back down close
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No successful repair reported for this finding.
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Performed · outcome unconfirmed · Original poster
Replaced the scavenge pump, deviation dropped back down close to zero.
Still finding plastic in oil after chain guide replacement
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Leading evidence: 'Replace scavenge pump, deviation dropped back down close' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace scavenge pump, deviation dropped back down close' (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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Suggestion
The tensioners themselves might still be OK, although if you are getting chain rattle at cold start, replacing the tensioners
Still finding plastic in oil after chain guide replacement
Replace the brown bits stopped showing up
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Suggestion
After a couple track days and oil/filter changes, the brown bits stopped showing up.
Still finding plastic in oil after chain guide replacement
Replace without splitting the case
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Suggestion
If you are getting black bits, that could be the IMS tensioner pad, but that pad cannot be replaced without splitting the case.
Still finding plastic in oil after chain guide replacement
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Hi everyone,
When I bought my 996 three years ago, the car was in a remote area and there was only one shop that could do a PPI, and they didn't check cam deviation. I didn't know it was an issue on these cars.
I later found deviation on one of the banks to be cresting 10 degrees and approaching 12, so I took it to a reputable shop. They found plastic in the oil filter from the chain guides and recommended replacing them, so we did.
Deviation went back down to zero before approaching 8 degrees again in the subsequent year. I took it back to the shop and they said the oil scavenge pump was dragging and forcing the cam gear to spin the engine out of time. Replaced the scavenge pump, deviation dropped back down close to zero.
Now, one year later, I'm finding brown flecks of plastic in the oil again. Any ideas what could be causing it? When I looked back over the paperwork for the chain guides, I noticed they didn't replace the tensioners. Should this have been done?
Thanks!
Well in my opinion if the tension pads on the solenoids have not been changed then I would suspect them as being the culprit of the brown pieces of plastic.
Here is what my old ones looked like, when I replaced them and I also have a picture of what the new ones look like to compare with.
New replacement pads (Porsche) almond & light brown colored. Evidence of wear on original (brown) pads.
Solenoid pads (brown), a chain rail (long brown part) and chain tensioner (black).
On the early engine, there are four total tensioner pads, top and bottom per side. If those were replaced, brown bits might just still be leftover in the engine. I had this happen to me. After a couple track days and oil/filter changes, the brown bits stopped showing up.
If you are getting black bits, that could be the IMS tensioner pad, but that pad cannot be replaced without splitting the case.
The tensioners themselves might still be OK, although if you are getting chain rattle at cold start, replacing the tensioners
could
resolve that issue, but there is no guarantee that will happen. Old tensioners can leak, and they are at the end of the oil pressure system, so they receive oil last, after everything else has gotten oil.
This is a source reference. Confirm exact model applicability in the original material.
