Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-30-2003, 10:32 PM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
Problem Turbo whistle?

Quote:
Originally posted by gsxr
Turbo whistle is from an intake air leak. Turbo whine (noise from spooling up & down) is normal, unless it's really loud - then it's a sign your turbo is near death. This is subjective so you need to drive another similar MB turbo for comparison.
Good luck,
uh ohhhhhhh... My turbo is running at 0.5 Bar... well thats where it sits... (about 7psi) I didnt set it there.... and I have the whistle of all whistles. I mean like it turns heads..... course the whole rig turns heads. I thought the whistle it was cool and normal. It does continue at all times once it starts and only stops once I decelerate and reach below a certain point in the RPM. This is the only MB I've ever driven or heard though. At what RPM it starts I have no clue since I dont have a Tach.

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

Attached Thumbnails
Problem Turbo whistle?-404td-1sm.jpg  
__________________
"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.
Reply With Quote
  #2  
Old 05-01-2003, 01:49 AM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
2D^

2D^ (To the top)

for the morning tech heads
__________________
"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
Reply With Quote
  #3  
Old 05-01-2003, 09:51 PM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
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.
__________________
"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
Reply With Quote
  #4  
Old 05-01-2003, 11:47 PM
Registered User
 
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
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
__________________
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!
Reply With Quote
  #5  
Old 05-02-2003, 01:56 AM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
Quote:
Originally posted by psfred

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
Well, I dont have to worry about it being exhaust restrictions issue cause when I bought this thing and had it shipped; they cut off the exhaust to help it fit into the shipping container. Sooo when I got it it had no exhaust.... It sounded just the same but a tiny bit louder.
__________________
"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
Reply With Quote
  #6  
Old 05-02-2003, 06:39 AM
R Leo's Avatar
Stella!
 
Join Date: Mar 2003
Location: En te l'eau Rant
Posts: 5,393
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
__________________
Never a dull moment at Berry Hill Farm.
Reply With Quote
  #7  
Old 05-02-2003, 10:47 AM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
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?
__________________
"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
Reply With Quote
  #8  
Old 05-02-2003, 11:54 AM
R Leo's Avatar
Stella!
 
Join Date: Mar 2003
Location: En te l'eau Rant
Posts: 5,393
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
__________________
Never a dull moment at Berry Hill Farm.

Last edited by R Leo; 05-02-2003 at 12:49 PM.
Reply With Quote
  #9  
Old 05-02-2003, 01:52 PM
coachgeo's Avatar
Registered User
 
Join Date: Jan 2003
Location: TX between Dallas and OK
Posts: 1,793
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.

__________________
"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
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 04:07 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page