Oil service

[alex_55]

I made until know six oil services and they never changed the oil from the turbos is this normal or should i be worried about that ?! thanks !

[jpflip]

Some people do them, some people don't. When you drain the turbos, only about 50 cc comes out. I do it in case of deposit in the bottom of the turbo reservoir but nothing so far....Remember this oil is from the engine and it is continuously moving from the turbo tank to the case drain via a suction pump and after to the oil reservoir. The turbo oil is not a closed loop system. Remember if you do the turbos there is a crush washer to replaced...

[alex_55]

thank you !

[Bostonduce]

Not to pick nits, but the 996tt turbo reservoirs use rubber o-rings, they are actually a 993 part number.

BD

[jpflip]

Bostonduce, I just look at my stock and they are crush washers part # 900 123 044 30 (see pics). This part becomes really hot and I doubt rubber would stand the heat. Turbos become red hot under heavy load.... Sorry if I am wrong but.... Just did a search at Pelican site and part# 900 123 044 30 is a crush washer...(there is a picture of the part)

Edited March 10, 2010 by jpflip

[alex_55]

the mechanics said that they are not changing the oil from the turbos because the reservoir is from aluminum and the screw plug can destroy the oil reservoir when they are trying to opening it

[jpflip]

Alex, I didn't know about that, but like I said before some people don't do the turbos. The first time I did mine I was afraid because the plug was overtighten. But I did so far three engine and turbos oil changes and after applying the proper torque, as per repair manual, I never had any problem...

[timf]

I recently changed my oil and decided to drain the turbo's, in the process I discovered a few things.

1. The dealer had clearly never drained the turbo's when they performed oil changes - I say this because the plugs were practically seized in place and it took tremendous torque to 'unstick' them (similar to jpflip experience ?). Of course the dealer could have removed them but just over torqued them during the re-install or perhaps that's the way they come from the factory ?

2. In my case the turbo drain plugs had no washers in place at all !! - and yes I checked very carefully that they weren't stuck to the plug or in the tank recess. I re-assembled everything per the correct torque settings sans washers and all seems well, no leaks. But I suspect I may re-visit this and install washers as shown above.

3. The amount of oil which came out was miniscule - so not sure if it was actually worth the effort / risk.

Edited March 11, 2010 by timf

[Bostonduce]

999-701-598-40-M17 O ring for 996tt '99-'05 and 993tt '93-98 :

I know it's wierd but Pelican does not show an crush washer application for the 996tt turbo reservoirs.

BD

[jpflip]

BD . I did a search in PET with part# 999 701 598 40 m17 and this part is applicable to 911 year 1989 and 964 year 1984 ??? It is not the first time Pelican had wrong information on parts but I always double check with Porsche parts cat and so far never had a problem. I hope you are aware of this good site for part# search AutoAtlanta, it is very useful but the parts are a bit expensive...

Just found something else the 999 701 598 40 is 18.65 X 2.45 and the one called by Porsche is 18 X 22

Edited March 11, 2010 by jpflip

[Loren]

999-701-598-40-M17 O ring for 996tt '99-'05 and 993tt '93-98 :

I know it's wierd but Pelican does not show an crush washer application for the 996tt turbo reservoirs.

BD

PET shows the washers and I have the March 2010 issue of PET.

[Bostonduce]

Ok you guys, you had to make me get down on the ground to check. :)

There is no crush washer on original 996TTS turbo reservoir tanks.

It's a recessed plug that takes a special hi temp o-ring.

Part number 999 701 598 40 from my last parts purchase. Curious that Auto Atlanta lists the part number, but it's no where to be found on the exploded diagram.

Most respecfully, it appears the PET is incorrect, and has been for years- can't see why they would supersede a crush washer when originally sealed with a o-ring.

Yes, the alumininum crush washer will 'work', but it can/probably will leak unless it's over torqued.

Pardon me while I go find some Advil...

BD

Edited March 12, 2010 by Bostonduce

[jpflip]

Good work BD . You make me laugh this morning and it is always a good start for a great day.... Have a good one!

[Boxxy]

I recently changed my oil and decided to drain the turbo's, in the process I discovered a few things.

1. The dealer had clearly never drained the turbo's when they performed oil changes - I say this because the plugs were practically seized in place and it took tremendous torque to 'unstick' them (similar to jpflip experience ?). Of course the dealer could have removed them but just over torqued them during the re-install or perhaps that's the way they come from the factory ?

2. In my case the turbo drain plugs had no washers in place at all !! - and yes I checked very carefully that they weren't stuck to the plug or in the tank recess. I re-assembled everything per the correct torque settings sans washers and all seems well, no leaks. But I suspect I may re-visit this and install washers as shown above.

3. The amount of oil which came out was miniscule - so not sure if it was actually worth the effort / risk.

I just did my first oil change and I found the same results as timf. VERY tight plugs. Looked to be never having been take out before. No crush washer either.

I did it because I wanted to see if there was any unusual wear (e.g. metal bits) in the oil from the turbo reservoirs (the oil was fine, no metal bits). In my opinion, there as a fair bit of oil in there. So I'm glad I did it. Other than the original over-torquing by either the factory or whoever did it last, it was easy to do, so I will also do it next time.

[Loren]

I don't know what it is about Turbos - we once had Turbo owner come to one of our Work on Cars Day and he could not get his oil filter loose.

At first I thought he was just not very strong (ok - I used the word wimp) ;) -- but after the first try I realized someone had way over torqued that filter housing.

I had to use both hands and grunt a lot to get it off - I almost went for a breaker bar.

Tools Pants had a little fun with the guy and after I loosened it - he had a woman (all of about 4 ft 5 in) come over and take it off in the owners sight. He was shocked! :lol:

[timf]

Hi Boxxy,

That's interesting that you had the same experience as me. Makes me wonder what's actually going on with these turbo drain plugs.

Out of interest - did you re-assemble with crush washers and torque down as they should be per specs ?

Tim

I recently changed my oil and decided to drain the turbo's, in the process I discovered a few things.

1. The dealer had clearly never drained the turbo's when they performed oil changes - I say this because the plugs were practically seized in place and it took tremendous torque to 'unstick' them (similar to jpflip experience ?). Of course the dealer could have removed them but just over torqued them during the re-install or perhaps that's the way they come from the factory ?

2. In my case the turbo drain plugs had no washers in place at all !! - and yes I checked very carefully that they weren't stuck to the plug or in the tank recess. I re-assembled everything per the correct torque settings sans washers and all seems well, no leaks. But I suspect I may re-visit this and install washers as shown above.

3. The amount of oil which came out was miniscule - so not sure if it was actually worth the effort / risk.

I just did my first oil change and I found the same results as timf. VERY tight plugs. Looked to be never having been take out before. No crush washer either.

I did it because I wanted to see if there was any unusual wear (e.g. metal bits) in the oil from the turbo reservoirs (the oil was fine, no metal bits). In my opinion, there as a fair bit of oil in there. So I'm glad I did it. Other than the original over-torquing by either the factory or whoever did it last, it was easy to do, so I will also do it next time.