Author Topic: loud noise on boost after TB broke & top end rebuilt on (Read 2753 times)

myke_w · « **on:** April 11, 2008, 02:41:19 pm »

So I took in a job with a broken belt.
Took head off, sent it away for valve job and cleaning with all new lifters, seats and valves and put it all back together with everything new in the belt train.

I pressure fill it with coolant, fill it with oil, time it and take it out for a spin.

As soon as boost begins building (when engine is under any load) there's an excruciating sound from under the hood, like a loud high pitch screaming, also accompanied by a nice oil stink, big cloud from exhaust, and oil barfing from the mating surface of the cartridge and hot side of the turbo. Also oil beginning to show where intake meets the head.

Customer swears (and I believe him) nothing like this was present before the belt broke..

Also, no chunks of anything were missing, so naturally I didn't take the turbo off to inspect it.

Seems to run fine on idle, and pre load -> no abject noises.

I'm obviously suspecting the turbo, but do you guys have no idea how it could have gotten damaged?

Any ideas? Anybody else ever hear a loud screaming when a turbo failed?

truckinwagen · « **Reply #1 on:** April 11, 2008, 04:28:09 pm »

sounds like the turbo.
it doesn't take much to blow them out especially when talking about a catastrophic failure like a timing belt failing.

myke_w · « **Reply #2 on:** April 11, 2008, 04:55:59 pm »

I'm gonna jerk it out. I'll let y'all know what I find, I expect one of the vanes is lost or somthing crazy like that...

myke_w · « **Reply #3 on:** April 11, 2008, 11:17:31 pm »

agreed, but this was immediately after i pulled it out of the garage..

HermTDI · « **Reply #4 on:** May 03, 2008, 05:57:42 pm »

Quote from: "myke_w"

agreed, but this was immediately after i pulled it out of the garage..

Mike...Check the EGR gaskets at the EGR valve pipe coming from the EGR cooler to the EGR valve.

I had a leak here after an intake cleaning...it sounded like a screaming witch under boost.

What I had were loose bolts at the EGR pipe and the boost made the metal gasket screeem wickedly.....tightened the bolts...solved problem

myke_w · « **Reply #5 on:** May 07, 2008, 10:03:36 am »

Thanks guys..

Turns out the bolts going into the intake that hold the egr cooler on were too short (and backed off.) I put the proper bolts in.. problem solved...