Valve seals

[oldman]

Does anyone have links to tach articles on changing the valve seals with the head attached?

I had excessive crank case pressure which blew my turbo seal. After I remove the exhuast manifold I can clearly see wet oil in and around the center two exhaust ports. Compession test was 165 162 155 160 dry and + 20 across wet. I will do another compression test tomorrow but it would have to be a cold test, most of intake and exhaust have been removed. Do you guys agree that I probably blew valve seals as well as the turbo seal? Thanks.

 

[WhiteCloud]

When I had bad valve stem seals, I had oil around 3 exhaust ports, and had smoke puff out of the exhaust when taking off from a stop (at idle). There was not a lot of smoke, nor was there constant smoke.

To remove the valve stem seals with the head attached, you need a Miller's Valve spring compressor. I think there is a link to directions on how to do it in one of my previous threads, if you feel like searching...but the tool itself is a couple hundred bucks.

 

[oldman]

I did search, are you speaking of the vfaq valve spring compressor article? My condition is almost like what you described accept my is really bad when ever I hit boost and I hae oil all over my ic and piping. I was removing everything today to clean and prepare for the new tubo in transit when I saw the oil on the exhuast ports. My friend and I figure if it's just the turbo seal the oil would have burned off.

 

[DSMatMSU]

that tool is expensive, and the ones you make yourself can be tricky to use.... i made one, man was it a pita.... i would look into removing it completely... so you could check out your valve guides...see if the valves are seating properly... theres all kinds of good stuff you could do... and still keep it cheap... something to look into if your willing to spend a little more...

 

[oldman]

In conclusion, do you guys agree that oil from turbo seal leak ahould not reach the exhaust ports on the head either from the compressor side or the exhaust side? If so, it would be the valve seals since I had good compression numbers, right? Is there a way to test for sure?

 

[DsMWookie]

I dunno about testing but I did my valve stem seals on the car. I bought the tool off ebay for 80$ and it worked great. I can take pictures of the tool if you need me to but Id check for it on ebay. It was worth every penny get a friend to go halfies with you and your good to go.btw I was puffing some smoke mainly at idle and alot on beginning crank up. It went away after i replaced those seals and burnt the excess of buildup off in the exhaust.

 

[Tallen]

I had excessive crank case pressure which blew my turbo seal.

There are no seals in a turbo that will blow out from excesive oil pressure.

Doing it on the car will cost about as much $ as taking the head off and doing it. Your choice there!

It would not hurt to have the valves re-lapped into their seats.

 

[oldman]

There are no seals in a turbo that will blow out from excesive oil pressure.

Not true, unless my turbo happen to blow the same time my catch can froze.

 

[Tallen]

Not true, unless my turbo happen to blow the same time my catch can froze.

Your basing this off your intricate experience of how a turbo works? You use the term "turbo Seal" to generally, because the only real seals are in in the cold side of the turbo. The piston rings "seals" won't become unseated by high oil pressure, we get these threads every winter. My ghetto catch can froze and I think my tubo blew. Either there is lingering oil in the exhaust or it aggrivated an already present problem in the turbo, then again, maybe its valvestem seals or something that took a dive.

 

[oldman]

Your basing this off your intricate experience of how a turbo works? You use the term "turbo Seal" to generally, because the only real seals are in in the cold side of the turbo. The piston rings "seals" won't become unseated by high oil pressure, we get these threads every winter. My ghetto catch can froze and I think my tubo blew. Either there is lingering oil in the exhaust or it aggrivated an already present problem in the turbo, then again, maybe its valvestem seals or something that took a dive.

That could be possible because I had this 16g for about 50k now. When this first happen, I was burnning both coolant and oil but the coolant part went away after I unhooked the "ghetto catch can". At first I thought it was the HG but compression was good and I have oil all over my intake track so I concluded it was my turbo but apparently the valve seals may be bad too. Thanks.