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post #1 of 7 Old 03-19-2017, 12:17 PM Thread Starter
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No shaft play in turbo could seals still be shot?

I've had an oil issue for some time. Smoking. Anyway after pulling the head it's clear something is wrong with #3 cylinder. Could be valve guide. Will be taking it to the machine shop Monday. The turbo boosts strong and there is no shaft play. Could the seals still be shot? Did not notice any oil trail in the swing valve.
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post #2 of 7 Old 03-19-2017, 05:07 PM
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Re: No shaft play in turbo could seals still be shot?

The turbo is probably still good. If it was not blowing clouds of smoke, especially after the engine was hot and idling at least the piston seal on the turbine side is still good. The turbine will dump oil into the hot swing valve and create a huge cloud of smoke when the engine is at idle or as you come to a stop. That is because when you are driving there is back pressure in the exhaust and the oil stays in the turbo cartridge/housing. When you let off, the back pressure is gone and oil gets sucked or will drizzle into the hot swing valve.

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post #3 of 7 Old 03-19-2017, 07:06 PM Thread Starter
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No clouds of smoke. It's easy to go down the rabbit hole once the head is off. Gonna let it ride as is. We'll see.
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post #4 of 7 Old 03-19-2017, 09:13 PM
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Re: No shaft play in turbo could seals still be shot?

Quote:
Originally Posted by xtrooper View Post
No clouds of smoke. It's easy to go down the rabbit hole once the head is off. Gonna let it ride as is. We'll see.
If you change to Mobil 1, the amount of smoke will be reduced vs Dino oil. I have used this trick for over 30 years.
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post #5 of 7 Old 03-19-2017, 09:55 PM Thread Starter
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Been using synthetics for many years. Recently changed to Shell Rotella T6.
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post #6 of 7 Old 03-20-2017, 06:10 AM
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Re: No shaft play in turbo could seals still be shot?

When a seal went on my SRT-4 turbo it would throw a James Bond smoke screen under boost.
Never did it when I was not boosting.

This was a big wheel stock turbo that had some machining issues.
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post #7 of 7 Old 03-23-2017, 09:14 PM
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You mentioned #3 cylinder doesn't look right. Piston problems are somewhat common these motors. Not always as obvious as you'd think just looking real quick. Could be source of smoke and oil consumption. You might want to double check while the head is off.
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