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  #1  
Old 01-10-2011, 08:35 PM
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Quote:
Originally Posted by 300sdToronto View Post
I had the "siren problem" on my 617 turbo and the issue turned out to be a poorly seated gasket where the turbo air intake tube mates with the air cleaner housing. A simple pull it off, reseat the gasket and reinstall cured my suspected "failed turbo" problem. One of the gaskets is hard to align properly (see the Dieselgiant write up) and using some kind of jelly lube to help it seat is a good idea.

Indie was all over me to buy a new turbo.......
This sort of goes along with the above.
When the Turbo was rebuilt It may be they did not index the Aluminum Compressor Housing exactly. Meaning that the part the hooks up to the Intake manifold may be a degree or two off. That might keep the Tube between the Turbo and the Intake Manifold from sealing well.
If that is what the problem is not a big deal to line it back up; just loosen the Compressor Housing Bolts enough to rotate it a little to line it up.
A leak there should show up if you use the Soapy Water on the area.
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Old 01-10-2011, 09:49 PM
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Right, I re-indexed it on assembly.. any tricks for the tube from the compressor outlet to the intake manifold? I just put fresh o-rings on it and lined it up so the gap looked even all around.
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  #3  
Old 01-11-2011, 01:53 AM
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T series turbos are not match balanced. A turbo that is match balanced will be obvious as material will be removed from the compressor's nut.
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Old 01-11-2011, 04:18 PM
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There's a cut taken off the compressor wheel that could be for balance. It's visible in the picture slightly hidden behind the nut.



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  #5  
Old 01-11-2011, 09:43 PM
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Quote:
Originally Posted by mcneil View Post
There's a cut taken off the compressor wheel that could be for balance. It's visible in the picture slightly hidden behind the nut.
That is for the compressor, not the assembly.
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  #7  
Old 01-11-2011, 10:40 PM
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Clearly these cars are going to need an oil tank inside the car with a manual pump just to make it home.
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Old 01-11-2011, 11:33 PM
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Originally Posted by leathermang View Post
Clearly these cars are going to need an oil tank inside the car with a manual pump just to make it home.
It helps keep the speed holes in the oil pan from getting oil starved.
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  #9  
Old 01-12-2011, 12:44 AM
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Oil Consumption vs. Oil Vapor Loss:

Quote:
Originally Posted by leathermang View Post
Clearly these cars are going to need an oil tank inside the car with a manual pump just to make it home.
Here is what I have discovered about 617 'oil consumption.' Yes, when these engines wear out, they do develop a lot of blow-by. However, after installing an oil separator (off one of our dry sump race cars) on my 617.950, I discovered that my engine wasn't burning oil at all; it was blowing it out the PCV.

It is inevitable, except when using gapless rings (as I used on Dad's 617.952) that some combustion leakage past the rings just happens by virtue of the pressure escaping through the ring gaps.

I can take the oil cap off my 617.950 with it running and get no visible vapor out of the crankcase, but you can feel some pressure escaping. Some of this is due to the up and down movement of the pistons displacing space in the crankcase, but some of it is leakage past the ring gaps.

However, once the oil separator was installed, I was recovering 1 pint of engine oil from the separator tank every 3,000 miles, which was exactly the amount the engine was apparently 'burning' according to the dipstick.

Gas will escape past a ring gap REGARDLESS of the ring's seal against the cylinder wall. This is a fact that does not change, except with gapless rings. Even with a gapless 1st and 2nd ring, you can still lose some combustion gas AROUND the rings, but this is greatly reduced.

My theory is that what ever gas is escaping past the rings rises up through the crankcase, through the head and timing chain area, where it passes through an oil mist created by the spinning camshaft and timing chain assembly.

This mist is pushed out of the PCV, as there is no baffling whatsoever in the 617.950 and only very limited baffling in the 617.952 camshaft covers.

This mist is pressurized by the turbocharger and in the case of my 617.950, some of the mist collects in the wastegate hose and bubbles up between the two halves of the intake/exhaust gasket, which leaves a trail of oil film down the side of the engine block.

Interestingly, once the oil separator tank was installed, the ‘oil consumption’ totally disappeared. The ‘missing pint’ is simply drained from the separator tank every 3,000 miles and can be re-introduced into the crankcase or simply disposed of properly.

I am notorious for running my 617.950 up to 10,000 miles between oil changes out of laziness and not wanting to change oil in foul weather. I try to stick to a 5,000 mile oil change regiment, but I often fall short of that mark.

I have used Delvac, Delo and Rotella 15w40 with excellent results. I have also used Valvoline 20w50 racing oil, since I buy it by the case for my other cars and the 617.950 seems to like that oil just as well.
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #10  
Old 01-12-2011, 01:06 AM
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Just like ol' Bert to convert a joke into an oil thread...
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  #11  
Old 01-12-2011, 02:11 AM
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Sorry, mate...

Just sharing what oils I use....

I'm like a drunk I guess...I will use any good oil that I can find on sale. Lately, the Delvac has been pretty cheap; about $9.00/gallon at O'Reilley's. I usually have lots of 20w50 Valvoline on hand, because I use it in my Firebird, so I use it sometimes too. I'm sure the extra zinc doesn't hurt....
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #12  
Old 01-12-2011, 02:17 AM
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P.S.

For those of you who have asked.....No one makes gapless rings for the 617. Total Seal Inc. will convert any new set of rings to gapless, which is what we did on Dad's 617.952. We used a conventional top ring with a gapless second. The next 617 I build will use gapless top and second rings, like we do on all our gas engines....
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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