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iTrader: (6)

I need help for a problem i ve been tracking down for the 3 last months.

My engine(New lt4 crate motor,last one) got a whistle sound coming from the front of the engine since the first start,right now it got 140miles only.

I ve change everything around and the whistle never go away.So today ive bought i mechanic stethoscope and search thru all the engine.

I ve check:water pump/tb/iac housing/intake and no strange sound.

When i check the timing cover i could clearly hear the whistle sound.So its coming from underneath the timing cover wich point to the timing chain?

By he way its a whistle sound no a grinding/shaving sound.

What should i do?
What could make the timing chain to whistle?
Can i run the car or its a no no ?

Thanks

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iTrader: (6)

I keep telling myself that it cant be the timing chain since its a whistle sound that i hear and not a grinding sound like metal on metal.

But what could whistle under the timing cover ???

thesoundandthefury

iTrader: (3)

Read through this thread:

http://forums.corvetteforum.com/show....php?t=1163505

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iTrader: (6)

Thanks for the link but im not using the lt4 ED/Hd timing set.My motor came with the standard lt4 one.

thesoundandthefury

iTrader: (3)

On the last page, the OP does a Rockwell hardness test on all three types've cam sprockets, (LT1, LT4, LT4ED), and finds that they're all the same.

It is rumored that a certain number of cam sprockets made it through GM's Q.C. without being heat treated for proper hardness. When you have two gears with different hardnesses, the teeth in the softer one will become worn out of tolerance specs and develop gear whine.

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iTrader: (6)

Ok now i understand the purpose of the link.I will took off the plug that i ve put instead of the crank sensor that i dont use to see if there is any metal chip.

meangreen94z

Are you sure its not a vacuum leak?

vtec

iTrader: (1)

check for a bad bearing on the waterpump drive shaft.

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iTrader: (6)

I ve shoot some(a lot) "liquid start" wich is ether around the intake gasket and all the vaccum port and i dont have nay leaks what so ever

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iTrader: (6)

So i would need to take the damn timing cover off

vtec

iTrader: (1)

yarr. not a fun job. i wouldnt have though the bearing would be bad given the constant bath of oil, but ya never know.