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#1
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Problem Turbo whistle?
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Sooo anywhoseee... I have a stack exhaust like a big rig and no muffler. Just a small silencer. This thing certainly sounds to whistle from the exhaust stack and not inside the engine housing if that's what ya mean by intake whistle. Might I have an intake air leak? 83-84?? 5cy Turbo D
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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way". by JerryBro The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair 62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels Last edited by coachgeo; 05-02-2003 at 10:48 AM. |
#2
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2D^
2D^ (To the top)
for the morning tech heads
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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way". by JerryBro The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair 62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels |
#3
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Wow. Looks like I started a hot topic here.... whopeeee
Anyway..... if anyone has a clue on my question here is some more info. I can here the turbo windup.... and wind down.... as in the whistle increases and decreases accordingly..... but it does whistle a high pitch tune on down the highway when the RPM's are high enough.
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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way". by JerryBro The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair 62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels |
#4
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Depends on the turbo -- my Volvo has people looking around for the police car -- in variable traffic it sounds just like a cop car about a block back. Annoying. Better, though, than the quiet turbo on it when I bought it -- no power!
I would guess an air leak. MB usually has pretty quiet turbos, but that stack with a vortex type air cleaner may let a lot of noise out. Check the high pressure parts for split pipes, leaking seals, etc. If the boost is venting off, it will whine a lot. Boost will be low as a result of the leak, although 9 psi may be about right, depending on the engine series (617s were 9-11 from the factgory, 13 psi max). Could also be something loose in the front of the turbo, too, but that won't restrict boost. Also, check for an exhaust restriction! My brother's 300SDL started whistling when the trap oxidizer plugged up. The seal for the exhaust line to the trap blew out, the rest of the system was plugged. No boost, no power, but great milage..... Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
#5
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Quote:
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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way". by JerryBro The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair 62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels |
#6
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Boost Facts
If whine is an indication of a mortally wounded turbo, then there must be thousands and thousands of turbochargers that only are moments away from destruction. Frankly, I'd be surprised not to hear a lot of turbo whine with the un-muffled and relatively straight exhaust tract that's on your Mog.
And, is your post of .05 Bar correct or is that a typo that should read .5 Bar? .05 Bar is only .72 psi. and is not a whole lot of manifold pressure. I'm assuming that you really meant to type .5 Bar (7.2 psi). And, that the whistle you are hearing is similar to what you'd hear on an turbocharged over-the-road 18-wheeler and not a metal-on-metal squeal. Before doinking with anything on the turbo, or assuming that the whistle means that something terrible is going to happen, you should find out the following: 1) Boost specs for that particular engine (an OM617, right?) 2) Verify accuracy of your boost gauge Later, R
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Never a dull moment at Berry Hill Farm. |
#7
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Yes 0.5 bar (about 7.psi as I stated) thanks for catching the error Ill correct it.
You are correct in that their is no metal to metal squeal. Ill have the easy things cheaked at least. any other comments?
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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way". by JerryBro The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair 62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels |
#8
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Run it!
More thoughts...
.5 Bar sounds a tad on the light side since 617s are supposed to run something like .8 Bar. But, that difference could simply be your gauge calibration. Try to find another air pressure gauge and plumb it in temporarily to compare the readings. It's possible that, given the genesis of your engine (a stationary engine in a tech school?) the wastegate has been monkeyed with at some point. Or, it may have been 'detuned' for enhanced reliability but that doesn't really make much sense because the MB is so darned reliable anyway. If the whine is objectionably loud, maybe you could add a tractor muffler to the stack? I know also that sometimes the stacks on marine engines wind up being lenghened or shortened to eliminate objectionable harmonics...you may be experiencing the same sort of thing with that long, straight stack. I do think if that Mog was mine I'd just run it...if there was anything wrong with that turbo or the oil supply, it would have died long ago. If the turbo ist kaput, go get another off of a junker. Just my .02 R Leo
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Never a dull moment at Berry Hill Farm. Last edited by R Leo; 05-02-2003 at 12:49 PM. |
#9
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I dont object to the noise. My reasoning behind this post was simply to understand my engine better and to help catch poetential problems as soon as possible.
This thing will be making a long Journy in Late Aug, Early Sept. so I want to get this thing in tip top shape prior till that. I just won an EBay auction for a 617 perfermance book of sorts so this will help me better understand things too.
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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way". by JerryBro The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair 62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels |
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