How to tell when the cummins holset vgt turbo is failing?

Do you have black smoke pumping out of your stacks yet?
Second....You'll notice Turbo lag.......

Btw....EGR's are designed (Be sure to thank Mary Nichols from CARB for that....) to fail...They'll take the VGT with them....I know...I have had the EGR...The EGR Cooler and three VGT's replaced on my '09......

 

Yep...Thank God for warranties....

 

you let me know where you get this borg warner and pdi manifold from.

and yes your turbo is going out. and no you won't experience lag.

i just had mine rebuilt and it lasted 2 weeks. this time however, it's makeing whistles and whirs. and the smoke is coming back just like before. only this time it's constant where as before it was off and on. with no noise. it just slowly went out.

when the thing finally got fixed. there really wasn't much power or performance improvement. only the smoke went away. and my milage only went up .5. so instead of the mid 4's. i'm in the very low 5 range. and i also installed a shuttle high flow muffler with the rebuilt turbo.

bottom line is. you really wont' see a performance difference untill it's basically dead. but you will see smoke.
and all that extra fuel is diluting your oil. not good for the engine.

 

there won't be any exhaust temps i don't think. beucase the engine isn't working that much anymore. it's basically being choked to death.

 

What I experienced with the ISX turbo was when you started to see oil leaking from the actuator shaft, then it is time to consider getting a new one. That oil could also be leaking in to the CAC and if it gets loaded up with oil, you have a real mess on your hands an likely will have to just bite the bullet and get a new CAC. Since the turbo is already too darn expensive, adding insult to injury by having to replace the CAC is a real hard hit. Mine lasted until almost 800,000 miles, but the cost and hassle gave me just another nudge to quit fighting with all this stuff and order up a glider with a pre-egr engine. A new turbo on the ISX was $3600 (with core exchange) on the parts counter last spring. A new turbo on my new glider is $695 with free shipping (and no core exchange) to my front door. Now it is practical to have a spare turbo on hand.

 

Don't forget,when it starts to use oil,the axle off the turbo has play on it.
It can cause the the vanes to touch the housing...............which can give you an engine filled with iron pieces.
Not good for pistons and valves.

04 Macks were prone to do that.