Busboy

Try spraying down with dish soapy water mix, if there's boost pressure you will see bubbles. I suspect you have a leaky gasket on the intake manifold. You may want to look at the vacuum lines again very closely, a cracked plastic line could be doing it.

patdaly

Did you start it with the belt off?

Tocapet

No vacuum on a diesel!

Busboy

I beg to differ, there are MANY things controlled by vacuum on our diesel trucks, all with vacuum lines running to them. The bubbles would be from "pressure" escaping from a leak on the intake manifold.

John Faughn

A diesel engine may not have vacuum , but on the back side of the PS pump is a vacuum pump .

bradler

well the neighbors are missing a cat but....

I didn't try to start it with the belt off because everytime its whistling/squealing away and i shut it off, it never does it when i restart until i get her fully warmed up again. I'm leaning towards intake plenum gaskets, time for some soap and water. Is there just the one gasket on the bottom of the intake horn or are there others below that? Guess i will try and follow all the lines from the vacuum pump and check them. THanks!

Dusty_Bottoms

Hey, this is an old thread but I have a scarily similar situation... a squeaking / whining / chirping sound from somewhere near the driver's side, but seems to echo down through the exhaust pipe pretty bad. I can't pinpoint the cause to save my life, neither could two diesel repair shops.


Curious how you made out?? Did you find the cause?

Kennys

When did they stop using a cam bearing? That's probably not the problem but every one of these engines that I have seen apart had 1 cam bearing in the front.

totalloser

Forget about engine bearings, they don't squeak when they go bad, they knock. I'm guessing the OP's issue was a clutch bearing since it was affected by operation of the clutch. Probably throwout bearing issue. In *theory* they don't touch when disengaged but in reality they do. Sometimes damaged pressure plate fingers can drag, too.

Most squeaking that can't easily be nailed down is from exhaust leaks at the manifold or the manifold to turbo due to loose fasteners or warping, or from leaking intercooler boots. The exhaust gaskets are stamped metal and when exhaust goes past them they almost sound like a bird chirp from the exhaust going past the metal like a reed in a musical instrument.

These are tougher to figure out because they only show up under load. Ball bearings (alt h20 pump etc) can make some pretty nasty squeaks, but show themselves at no load and can be more readily found.

I'd encourage you to start a new thread, Dusty, since your question likely will get skimmed over by many readers (thinking it's an answer). Welcome to the forum.