LOST JEEPS
http://www.lostjeeps.com/forum/phpBB3/

wierd info found out from previous owner about turbo
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=54293		 Page 1 of 1
Author:  ajk381 [ Fri Jul 16, 2010 1:10 am ]
Post subject:  wierd info found out from previous owner about turbo
so apparently the previous owner of my crd says he replaced the turbo due to it going bad almost 20k miles on the dot, says he replaced it 4x its got 90k now so he says its coming up on needing another at 100k. which i think 100k is a normal interval not 20k. has anybody had any similar problems? im not sure what kind he put on he said it was all repaired under an aftermarket warranty. thanks in advance.
Author:  LibertyCRD [ Fri Jul 16, 2010 7:42 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
If he was replacing turbos every 20K, there is definitely something WRONG. Wonder how he was killing them?
Author:  warp2diesel [ Fri Jul 16, 2010 7:45 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
ajk381 wrote:
so apparently the previous owner of my crd says he replaced the turbo due to it going bad almost 20k miles on the dot, says he replaced it 4x its got 90k now so he says its coming up on needing another at 100k. which i think 100k is a normal interval not 20k. has anybody had any similar problems? im not sure what kind he put on he said it was all repaired under an aftermarket warranty. thanks in advance.


Sounds like an Idiot Dealer Techs worked on it. I have run turbos on other diesels well over 250,000 Miles and they were still good when I got rid of them. There is a chance the veins are getting stuck due to the mix of oil and EGR turning into carbon or deposits from oil additives from oil burning and causing the problem. Install Provent, home made oil separator, or EHM and shut off the EGR; then the problem should go away. There are several posts on TDI forums that have had the veins stick. TDI owners cleaned up the veins and put the turbo back to use.
Author:  BVCRD [ Fri Jul 16, 2010 8:22 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
Probably was doing some stupid crap like pulling into the driveway and just shutting the thing down.
Author:  linewarbr [ Fri Jul 16, 2010 8:40 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
The previous owner is either an idiot, or just really likes having his vehicles in for dealer service. If a major engine component was "failing" every 20K miles, how would he not realize that there was something drastically wrong with it?

The reality is that there is nothing wrong with those turbos, a service writer simply saw an opportunity to do warranty work to pay the bills. The tech probably got so good at it that by the last time, he pulled and replaced the thing in 30 minutes and of course got his 6 hours shop time for it while he moved on to adding headlight oil and muffler fluid to the next vehicle down the line.

A common issue for these engines in stock configuration is soot from the EGR and oil from the CCV mixing and forming sludge in the intake tract. When this sludge interferes with one particular sensor in the intake, the engine throws a Check Engine Light with the code for "turbo underboost." It is at that point that the PO's dealer decided to ride the gravy train rather than address the issue - which is to pull the sensor and clean it.

Spend some more time reading up on this board. We here are the nerve center for CRD knowledge in the US and Canada, not the dealer network. (Or to quote JL, we're kind of a big deal)
Author:  changingtime [ Fri Jul 16, 2010 9:29 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
I have to assume if you do turbo cool down, the thing should last well beyond 100k miles. Maybe, i'm wrong here but not sure why a turbo would be failing that quickly.
Author:  JL Rockies [ Fri Jul 16, 2010 11:41 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
I never do turbo cool-down with maybe the exception of leaving the engine running while filling it on long road trips. I am past 99K miles now with the EGR connected and no bypasses or tunes.
Author:  BVCRD [ Fri Jul 16, 2010 12:18 pm ]
Post subject:  Re: wierd info found out from previous owner about turbo
JL Rockies wrote:
I never do turbo cool-down with maybe the exception of leaving the engine running while filling it on long road trips. I am past 99K miles now with the EGR connected and no bypasses or tunes.





It probably isn't an issue for around town driving. Critical for after high speed driving.
Author:  mikey1273 [ Fri Jul 16, 2010 1:07 pm ]
Post subject:  Re: wierd info found out from previous owner about turbo
yeah not a big deal to cool the turbo in around town driving unless you live at the bottom of the freeway offramp or have a long steap driveway to climb. Driving in stop and go traffic under 35-40 mph dosen't heat up the turbo like highspeed driving, towing or climbing steep grades does.

I normally get home park and gather the phone and things, put up the windows and then shut of the engine. If you read the owners manual there is suggestions for how long to idle to cool the turbo. City driving is 30 seconds or less I think. towing whil climbing steep grades is the longest upto 5 minutes.
Author:  linewarbr [ Fri Jul 16, 2010 1:13 pm ]
Post subject:  Re: wierd info found out from previous owner about turbo
I know you have your own way of doing it JL, but. . . you pays your money, you takes your choice.

When you're putting temperatures between 900 and 1300 degrees F into your turbo, it's a good idea to let it idle for a bit to cool off. The issue is not metal temperatures, it's oil coking in the passages and return lines due to the temperature of the metal. Using 0W or 5W full synthetic oil makes it less of an issue, but still - I cool mine some, particularly after exiting the Interstate where I've been going 80 mph for the last hour or two.

Here is the turbo chart from the owner's manual:
Image
Author:  tonycrd [ Fri Jul 16, 2010 4:56 pm ]
Post subject:  Re: wierd info found out from previous owner about turbo
ajk381 wrote:
so apparently the previous owner of my crd says he replaced the turbo due to it going bad almost 20k miles on the dot, says he replaced it 4x its got 90k now

Never changed oil? Or used dino from Wallmart? 100k+miles and no problems here. Gets fresh full synthetic oil every 6250..
Author:  Joe Romas [ Sun Jul 18, 2010 7:53 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
tonycrd wrote:
Or used dino from Wallmart?


Tony. Walmart also sells Shell Rotella 5-40 and Mobil 1 Turbo diesel truck oil :jester:
Author:  Cowpie1 [ Sun Jul 18, 2010 11:12 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
linewarbr wrote:
I know you have your own way of doing it JL, but. . . you pays your money, you takes your choice.

When you're putting temperatures between 900 and 1300 degrees F into your turbo, it's a good idea to let it idle for a bit to cool off. The issue is not metal temperatures, it's oil coking in the passages and return lines due to the temperature of the metal. Using 0W or 5W full synthetic oil makes it less of an issue, but still - I cool mine some, particularly after exiting the Interstate where I've been going 80 mph for the last hour or two.

Here is the turbo chart from the owner's manual:
Image


If you are putting temps of almost 1300 to the turbo, you've got some real issues to resolve. The only way you would even come close to those temps in the turbo is if you had the accelerator to the floor and were pulling a heavy load up the side of Vail Pass in Colorado, on a scorcher of a day and keeping your RPMS too low for the pull! Getting to those temps is a function of exhaust flow, fueling, RPM and load. I never even approach those temps in the turbo on my Cummins ISX in my semi pulling 80,000 lb thru the mountains of W. VA on a 100F day. Really kind of hard to imagine you are doing it with a CRD.

That being said, turbo cooldown is not bad, but not the issue that most think it is. I have taken original turbos to over 1.4 million miles without worrying about turbo cooldown in all but a very few situations. I even have turbo blankets installed on most of my turbos, since there is a cooling effect as the exhaust goes thru the turbo and the slight cooling actually creates a restriction. By having a turbo blanket on, the temps actually run 100-200F cooler in the turbo because the exhaust is not being slowed down in the turbo by any cooling. Restriction is always the turbo killer. Total fueling under a hard pull with the RPMS too low will generate a considerable amount of heat. If driven right, even under hard towing and high speeds, no turbo will be at risk of reaching the temps you suggest. Speed and higher RPMS are not what causes a turbo to reach critical temps. It is restriction in the exhaust that keeps the exhaust from getting out of the cylinders, thru the manifold, by the turbo and on out that causes excessive temps. Too low of RPMS with high fueling under a hard pull will do this as well.

This is the primary reason I advocate that one of the first mods that ANYONE should do to any diesel engine is to open up that exhaust!!! Reducing the restriction there has the best bang for the buck in saving that engine and turbo. I am just about ready to go over 3 million miles commercial operating turbo diesels and have seen most problems with turbos are restriction in the exhaust which will raise EGT's higher than necessary. Opening up the exhaust can lower EGT's considerably and increase power to the rear wheels.

Just the running down your street a few blocks and coasting on into your driveway will cool a turbo down from even the most extreme temps it may have been at. Most good drivers will decelerate and coast onto the off ramp of a freeway and in that time, the turbo temp will drop considerably from the temp it was under during that hard running. Unless you have the accelerator to the floor, pulling 5000 lb up hill, on a 100F day, and then reach up and shut the engine off without even letting up on the throttle, you will never destroy a turbo from excessive heat and not allowing it to cool. Once you remove the fueling from the engine, the exhaust cools considerably and likewise the turbo cools soon. Plus the oil is still circulating thru the turbo and is also has some cooling effect as well. Of Course, a rotten driver can destroy a turbo as well.

Do your cool down routine as you wish. No problem. Just don't develop some sort of of superiority complex that those who do not do it like you are somehow inferior. That is based on feeling and not science.
Author:  linewarbr [ Mon Jul 19, 2010 10:21 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
x2 on all of that, but particularly the superiority/ inferiority complex comment. Most of us are on here BECAUSE we have strong opinions, and sometimes we state those opinions as though they are cold hard fact. It is the fact that you can find, here, opinions backed up by fact that make LOST what it is.

Keep reading and learning, and no, you do not need a new turbo every 20,000 miles!
Author:  ajk381 [ Mon Jul 19, 2010 11:17 am ]
Post subject:  Re: wierd info found out from previous owner about turbo
Sorry haven't been on in a few days and this thread blew up. I know it shouldn't be replaced that often. The guy didn't say why just that it was I've never heard of any turbo going bad than fast. Even in work trucks that are beat day in and day out. He did say that he did use it as a truck and the wear proves that, not sure if these just aren't ment to be worked hard or what. Also I did feel quite a bit of shaft play but I'm not sure if the variable turbos have more then regular ones do. Btw it's had the orm and ehm done for about a month now since I got it. And I've been lurking around the whole time so I learned Alot already I know about cars crds are just new to me.
Page 1 of 1 All times are UTC - 5 hours [ DST ]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/