hydraulic tensioner flexible hose delaminated?

[SunburntLobster]

Hi
Closer inspection of the root cause of my engine failure is shards of hard black plastic which seems to have originated from the inner lining of the black flexible hose used on the retro-fitted hydraulic tensioner upgrade (parts are dated 1989)

anyone else seen this before?

Thanks, Jack

[Classic 911]

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[ahh911]

Jack,
Is this from your 1976 911S post where one piston was wrecked linked below?

1976 911S project

If so, how did the shards/or at first silicone was your thought make it into the piston squirters? Did your oil filter fail along the way?

Phil

[SunburntLobster]

Hi Phil

yup that's the one. I found the shards of plastic in:

1) oil pump teeth
2) cam oil tube
3) oil cooler
4) sump strainer
5) piston squirter.

The reason we think it is the hose is because some large shards were in the banjo and to big to pass through from either side. Will cut it in half to confirm.

I would need to study the oil flow diagram to understand how it has got into all the components listed above.

[ahh911]

Jack,
Did you open the filter?
Phil

[SunburntLobster]

yup it was really clean, it had a new oil and filter shortly after it arrived in the country.

Thinking about it the previous owner had fitted a large oil cooler in the rear, I can't remember exactly how it was installed but I don't think it had a thermostat. It was brazed into the flow pipe from the tank and had a pair of flexi.

I had it removed because it was leaking, I suppose the debris could have come from this.

[stownsen914]

Hmmm, upsetting news to be sure.

Is it strange though that such debris made it from the tensioners/lines, past the sump screen, all the way through the scavenge system, through the filter to the tank, and back to the pressure side of the engine?