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deltadllc
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03 Cat C-15 turbo boost dropped following a stock replacement install.

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Engine: 03 Cat C-15 1.2 mil miles. 700 k on rebuild. 379 Pete.

History: Last week blew the Intake side of the turbo wheel in Half. 4 Fins from the wheel missing. Limped to a shop, installed a factory replacement. Did not flush Charge air cooler by service tech recommendation. Exhaust fins had no sign of damage, no oil in the charge air cooler.

Concerns: Engine life - What is the probability of parts reaching the intake? damage it may cause? things to watch / listen for? Boost pressure on my KR scan Gauge maxed out at 70 previously, now it peaks at 54. Is this a wastegate adjustment or a sign of trouble?

**BTW thanks to the KR Scan Gauge boost was Immediately Identified upon break down.

I really like the way you formatted this post, makes it easy to read and understand.

Chris Hileman,

Update: Charge air cooler replaced w/ a new one. Boost pressure is Higher at the lower RPM'S, than with the leaking CAC, But Max boost is Still 5-7 Less than with original turbo. I think it's time for a Cat shop.

deltadllc,

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Your
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'''I've made the same repair on an N14. Remove your air cleaners and look for the pieces of the intake impeller in the air cleaner housings. When you have this type failure you get a blow back that can propel the pieces of impeller back toward the air cleaner closest to the turbo, sometimes you can find them laying in the air cleaner piping. If the pieces went the other way they should stay lodged on the turbo side of the air to air. You can always remove the CAC and try to shake the pieces out but it is common to do this with this type failure and leave them. The pieces usually are too big to travel through the CAC.

The boost sounds right at 54psi. Bruce Mallinson says the rule of thumb for horsepower is 12 HP for every pound of boost so at 54 psi X 12= 648 HP but at 70 psi X 12 = 840 HP. Drive it and don't worry.'''

Grin'n "Drive it and don't worry.''...Not sure on the Don't worry part, Maybe worry less. Thank you!! I really appreciate your input! I'm thinking: Part 2 of the question / boost gage reading seems too high on the first Turbo, if actual readout is correct. I have heard comments that have KR Scan Gauge boost may be Double the actual amount. If that were the case: 1st turbo would have produced 420 HP and now down to 324 HP.

deltadllc,

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MOtech9
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not real familiar with c13 but I agree with blackwood, ive replaced 50+ turbos that have sent pieces everywhere, even had a few without CAC that went into the cylinders, no real damage, upon teardown hundreds of thousands miles later found some dings in pistons but ran fine. keep an eye on fuel mileage and its possible that some of the pieces stretched and damaged some passages on the cac but that will show in fuel mileage if you tracked it before and after

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Chris Hileman
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If the CAC was damaged by the turbo explosion, that woul result in lower boost pressure as some of your boost is escaping thru the leaking CAC.

The shop said.. "A sudden failure in the CAC, can cause a Turbo to over rev., and fail as well".

deltadllc,

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deltadllc
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I had the Charge air Cooler checked for leaks Fri.. That's the Trouble. Scheduled for a replacement Monday. Will Update with results.

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deltadllc
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Update #2: I decided to have my local shop take a look at my boost pressure and try to determine where it has gone. They found my new turbo had been destroyed by debris from the old turbo entering the intake side. Explanation: "Back pressure" from a blown turbo will send debris toward the air cleaners, and must be removed prior to new turbo installation. The original shop has agreed to reimburse all parts and labor. Best news: got a borg/warner turbo this time. Whooo whooo .. and saved nearly 500.00!

Again: Scan Gauge KR Identified boost Immediately, AND told me the new Turbo was still not performing up to par. Therefore, I was able to get the problem resolved, before shops start to deny warranty on workmanship. Thank you Kevin!

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