CRD rocker arm wear...more info

Hot Stuff · **Posted:** Tue Apr 02, 2013 7:36 pm

Here's my wasted rockers......... they almost all had a ton of roller slop, one wouldn't roll at all.

viewtopic.php?f=5&t=74587&start=80

At 92000 miles. Replaced both cams and all the rockers and lifters. Previous owner was always at 5000 mile intervals with Mobil 0w-40. So he said, and I believe him.

cmpbiker · **Joined:** Mon Mar 29, 2010 1:26 pm **Posts:** 62

What is the "MAP idle test"? I have the Torque Pro software and can find a MAF sensor but it shows CFM.

CATCRD · **Posted:** Fri Apr 05, 2013 8:36 pm

Go into the app settings and change units to g/s to compare with our readings. Also post your idle rpm during the test.

striperman36 · **Posted:** Sat Apr 06, 2013 11:08 am

DOC4444 wrote:

The $50 fee is to restore a tune that was lost due to a dealer or other reflash.

There is no cheaper way to get all the benefits of a GDE tune any other way. Regular ECO tune is the way to go if you do not plan to replace your torque converter. (You can always upgrade later for a small fee if you get a stronger TC.)

I would say that you have gotten your $$$ worth as much as anyone has from your CRD.

My suggestion is that you buy an ELM327:

http://www.ebay.com/sch/i.html?_trksid= ... &_from=R40

and the Torque Pro app for your phone and do the MAP idle test.

This will assess the level of rocker bearing surface wear without taking anything apart.

CATCRD thinks anything over 17 at 760 RPM at sea level means you are OK.

Please post results.

DOC

Do you have this on android?

DOC4444 · **Posted:** Sat Apr 06, 2013 11:47 am

Torque Pro is available for Android phones, but the developer is apparently not willing to make a version for the iphone.

DOC

striperman36 · **Posted:** Sat Apr 06, 2013 12:21 pm

DOC4444 wrote:

Torque Pro is available for Android phones, but the developer is apparently not willing to make a version for the iphone.

DOC

use a bluetoothe elm27?

I'm curious now, I may indulge before I starting towing the yacht

DOC4444 · **Posted:** Sat Apr 06, 2013 1:32 pm

See the link from earlier in this thread on where to buy. No need to buy the muli-hundred dollar "real" ELM327. The sub-$20 ones seem to work fine, at least with my Ford 7.3 and Jeep KJ CRD. (I have the one with the orange and blue label. I would go with that. One less variable to introduce.)

DOC

cmpbiker · **Joined:** Mon Mar 29, 2010 1:26 pm **Posts:** 62

I have my results- MAF reading 20.1 at 763 RPM at an altitude of 4171.
I still don't understand how this represents a wear test on your rockers. Let me know what the tea leaves say!

kjjet · **Posted:** Tue Apr 09, 2013 12:35 pm

cmpbiker wrote:

I have my results- MAF reading 20.1 at 763 RPM at an altitude of 4171.
I still don't understand how this represents a wear test on your rockers. Let me know what the tea leaves say!

The test is a reading as to how well the engine is using air. (breathing) I don't feel this is a great way to know how rockers are. There are other things that effect MAF readings. :2cents:

GreenDieselEngineering · **Joined:** Sun Jun 07, 2009 5:10 pm **Posts:** 1111

20.1 g/s is a good flow number given your altitude. It is a decent indicator that your rockers are in good health.

dieseldoesit · **Posted:** Tue Apr 09, 2013 5:33 pm

GreenDieselEngineering wrote:

20.1 g/s is a good flow number given your altitude. It is a decent indicator that your rockers are in good health.

Is there a table posted somewhere that has what expected values should be for different elevations?

cmpbiker · **Joined:** Mon Mar 29, 2010 1:26 pm **Posts:** 62

GreenDieselEngineering wrote:

20.1 g/s is a good flow number given your altitude. It is a decent indicator that your rockers are in good health.

Yes I would hope so, just had the bad ones replaced 10k ago. If this thread would have been around I would have over rode my mechanics suggestion and replaced all of them instead of the ones he felt were bad.

I am assuming that the flow numbers are based on the idea that we are getting full lift on the valves?

GreenDieselEngineering · **Joined:** Sun Jun 07, 2009 5:10 pm **Posts:** 1111

cmpbiker wrote:

GreenDieselEngineering wrote:

20.1 g/s is a good flow number given your altitude. It is a decent indicator that your rockers are in good health.

Yes I would hope so, just had the bad ones replaced 10k ago. If this thread would have been around I would have over rode my mechanics suggestion and replaced all of them instead of the ones he felt were bad.

I am assuming that the flow numbers are based on the idea that we are getting full lift on the valves?

Certainly. At idle the turbo makes no boost essentially and the air flow has correlation with valve lift to some degree.

dirtmover · **Posted:** Thu Apr 11, 2013 7:53 am

kjjet wrote:

The test is a reading as to how well the engine is using air. (breathing) I don't feel this is a great way to know how rockers are. There are other things that effect MAF readings. :2cents:

No it doesn't compare with a teardown and inspection but it's cheap and easy and in the absence of any other suggestion is the best option we have at the moment. Yes, there are other things that affect MAF readings but they are likely also things that we want to know about such as a failed intake hose, EGR issues, blocked or damaged filter etc.

My strategy is to assume my current reading (730mg/str @ 220') is good and start monitoring for change from now on. If it drops I know I need to start investigating.

dieseldoesit wrote:

Is there a table posted somewhere that has what expected values should be for different elevations?

Here you go:

So, for example, at 5000' you'd use about 86% of Keith's suggested target (640-720mg/str).

A reasonable rule of thumb for the altitude ranges we're talking about here is about 2.6% per 1000'

Auberon · **Posted:** Fri Apr 12, 2013 10:23 am

ON OIL availability.
In Australia there is not such a choice of FULLY SYN OILS and I have been forced to use Mobil 0W-40.
Despite searching on something I am passionate about to excess I have been unable to find an alternate oil that is NOT based on PAO that suits MY operational conditions / duty / etc.
It is not easy to obtain QUALITY oils here of the correct grades. When you start to look at NOACK , shear, Flashpoint, base etc there is always a shortcoming in an important property.
Too much mineral oil in the structure of the base.
Hence, my relatively short change interval of 5 000 km.

I continue to search but have little joy.
I NEED a better oil for when I commission the by-pass system.

supraman · **Posted:** Wed Apr 17, 2013 11:54 am

dirtmover wrote:

kjjet wrote:

Here you go:

So, for example, at 5000' you'd use about 86% of Keith's suggested target (640-720mg/str).

A reasonable rule of thumb for the altitude ranges we're talking about here is about 2.6% per 1000'

Was pointed to this thread by GDE and Doc... my test results: measured 17 g/s at 760 RPM at 4000' elevation. I ran through a conversion, and if I didn't screw the numbers up that lands me at 671 mg/str. Which adjusted, for 4000' elevation puts me above the suggested minimum flow from GDE?

Jeep stats: obtained at 164k, did ORM mod and switched from the Previous owners's use of Mobil 1 0w40 to Amsoil 5w40 at 167k. I'm now at 191k miles.

dirtmover · **Posted:** Wed Apr 17, 2013 3:02 pm

supraman wrote:

Was pointed to this thread by GDE and Doc... my test results: measured 17 g/s at 760 RPM at 4000' elevation. I ran through a conversion, and if I didn't screw the numbers up that lands me at 671 mg/str. Which adjusted, for 4000' elevation puts me above the suggested minimum flow from GDE?

Jeep stats: obtained at 164k, did ORM mod and switched from the Previous owners's use of Mobil 1 0w40 to Amsoil 5w40 at 167k. I'm now at 191k miles.

At 4000' you're looking at about 89% of the range which gives 570-640 mg/str so at 671 you're good.

JieselDeep · **Posted:** Thu Apr 18, 2013 2:58 am

Just ran the test with Torque Pro and got 8.8-9.0 g/s at idle of 752rpm.

I believe I'm one of the 'other factors affect MAF' guys because my intake hose and Clean Air hose are cracked and the replacement intake hose is in the mail!

The air filter isn't new, but the mechanic I took it to for the pre-sale inspection said 'that looks pretty good!" It's a paper Fram air filter.

I have a bad intercooler intake hose and a bad "Clean Air Hose"...I'll report in as soon as I replace them and let you know what my numbers are after the change.

Anyone know a good source for the "clean air hose"?

Thanks,
Jon

dirtmover · **Posted:** Thu Apr 18, 2013 5:32 am

groelzj wrote:

Just ran the test with Torque Pro and got 8.8-9.0 g/s at idle of 752rpm.

I believe I'm one of the 'other factors affect MAF' guys because my intake hose and Clean Air hose are cracked and the replacement intake hose is in the mail!

Yes, this is likely the biggest contributing factor to your low reading but bear in mind it's about half what it should be which means that, if this is the only issue, half your intake air is completely unfiltered. This could be pretty bad if it's been run like this for extended periods.

DOC4444 · **Posted:** Thu Apr 18, 2013 7:20 am

groelzj,

Have you checked your turbo shaft? If this rig has been running this way for long, the turbo is probably shot. When you remove the air intake hose, you can grab the end of the shaft. If there is ANY endplay, have it TOWED to the dealer where you have the warranty and have them install a NEW turbo (NOT rebuilt). Cheapest place is GDE ($800). (Barely perceptible axial play is normal.)

Several people here have lost their entire motor in LESS than a minute after turbo failure.

DOC

CRD rocker arm wear...more info

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