More data on the mosquito fogger
05-06-2009, 07:57 PM
#16
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By the way, I think ViperBob is the one selling the PSS10s a few posts down.
I also think Kevin at UMW is where you get the check valves.
Greg H.
I also think Kevin at UMW is where you get the check valves.
Greg H.
05-07-2009, 11:53 PM
#18
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I'll add a data point....
No check valves and no smoking for quite a while (1st 20k+ miles of my ownership). Then an oil change was followed by mild fogging. Changed to a second small filter (both Porsche filters) and all was good. Two oil changes later, mosquito abatement time. Took 3 trys on the small filter to corrrect. But correction lasted less than 500 miles (including one DE day). Appears seals cooked on one turbo, probably on its last legs but the extra oil in the turbo during the fogging scenarios must have finished the job. Replaced both turbos with units from UMW. Added the check valvles too. So far no problems.
I'm not convinced the check valves solved a problem for me. I added them anyway (while I was in there) and view them as cheap insurance.
Kevin
No check valves and no smoking for quite a while (1st 20k+ miles of my ownership). Then an oil change was followed by mild fogging. Changed to a second small filter (both Porsche filters) and all was good. Two oil changes later, mosquito abatement time. Took 3 trys on the small filter to corrrect. But correction lasted less than 500 miles (including one DE day). Appears seals cooked on one turbo, probably on its last legs but the extra oil in the turbo during the fogging scenarios must have finished the job. Replaced both turbos with units from UMW. Added the check valvles too. So far no problems.
I'm not convinced the check valves solved a problem for me. I added them anyway (while I was in there) and view them as cheap insurance.
Kevin
05-10-2009, 10:39 PM
#19
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Thread Starter
Another Data Point
Well, I got a chance to noodle around under the car this weekend for a few minutes (emphasis on FEW as it was Mother's "weekend"...not just day 
)
And I found that my Passenger Side turbo is leaking somewhere. It's definitely not the valve covers, not the timing chain cover, and it doesn't seem to be from any o-ring that I just replaced when I replaced the valve cover gaskets.
Sooooo...now what culprit should I be suspecting next? It seems that check valve is now not likely the culprit, nor the oil filter. Why can't these things happen at the END of the driving season???
)And I found that my Passenger Side turbo is leaking somewhere. It's definitely not the valve covers, not the timing chain cover, and it doesn't seem to be from any o-ring that I just replaced when I replaced the valve cover gaskets.
Sooooo...now what culprit should I be suspecting next? It seems that check valve is now not likely the culprit, nor the oil filter. Why can't these things happen at the END of the driving season???
05-10-2009, 11:22 PM
#20
Nordschleife Master
Scott,
My understanding is that faulty drain valves in the filters will eventually result in oil pooling in the turbos... eventually wrecking the turbos. I'd still recommend new filters and the anti-drain back valves. If you can do it before the turbos are wrecked, you may still live through this.
My understanding is that faulty drain valves in the filters will eventually result in oil pooling in the turbos... eventually wrecking the turbos. I'd still recommend new filters and the anti-drain back valves. If you can do it before the turbos are wrecked, you may still live through this.
05-10-2009, 11:30 PM
#21
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Scott,
My understanding is that faulty drain valves in the filters will eventually result in oil pooling in the turbos... eventually wrecking the turbos. I'd still recommend new filters and the anti-drain back valves. If you can do it before the turbos are wrecked, you may still live through this.
My understanding is that faulty drain valves in the filters will eventually result in oil pooling in the turbos... eventually wrecking the turbos. I'd still recommend new filters and the anti-drain back valves. If you can do it before the turbos are wrecked, you may still live through this.
I'm a little nervous this turbo might already be cooked. I didn't get a chance to pull the inlet side and look into the turbine to check for obvious oil blowby...that'll come next.
05-11-2009, 06:51 AM
#23
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As per my earlier post - remove the drain plug on teh turbo sump and post how much oil drains out.
05-11-2009, 02:38 PM
#24
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Last time I got my 96 P93T as a mosquito fogger was on a cold start right after oil/filter change. This also happened to be the first time I experienced this much smoke coming from the turbo and my car has gone thru numerous oil/filter change at 37kmiles. So drove my car back to the Porsche Tech carefully and gently without getting into boost. Initially they were sure that the cause was blown turbo seal since they do not think that the small filter is defective since they have been using the OEM Porsche filter batch for other 993s w/o problem. Putting a check valves was not my first option since the labor is not insignificant considering after more than 15 years this was my first experience with having my P93T turn into a mosquito fogger. I would put in the turbo check valve if I am rebuilding/replacing the turbo though.
So after replacing the small filter the problem simply disappear.
I had been replacing my oil/filter every 5kmiles or annually whichever come first but from now on, I will refrain from replacing the small filter until I hit 7.5kmiles and simply replace the oil only following my regular schedule.
Back then they said that the Mann filter is the one with defective valve but I believe that it can happen to any Porsche OEM filter. It is just not worth it to replace the filter too often with the risk of damaging the turbos in case of major oil flooding.
In my P93T, I will only replace filters every 7.5kmiles but I will replace the oil annually or 5kmiles whichever come first.
If I am not mistaken the Porsche manual recommend replacing oil and small filter every 7.5kmiles and the big filter every 15kmiles
So after replacing the small filter the problem simply disappear.
I had been replacing my oil/filter every 5kmiles or annually whichever come first but from now on, I will refrain from replacing the small filter until I hit 7.5kmiles and simply replace the oil only following my regular schedule.
Back then they said that the Mann filter is the one with defective valve but I believe that it can happen to any Porsche OEM filter. It is just not worth it to replace the filter too often with the risk of damaging the turbos in case of major oil flooding.
In my P93T, I will only replace filters every 7.5kmiles but I will replace the oil annually or 5kmiles whichever come first.
If I am not mistaken the Porsche manual recommend replacing oil and small filter every 7.5kmiles and the big filter every 15kmiles
