What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Knocking nosie comin from the flywheel/starter area

Dam* it! ...it's back. The knocking is now accompanied by a wonderful high pitch whistle. When I shut the truck off, the whistle sounds like pressure is releasing from the oil pan or somewhere close to it. It sounds like a sine wave going from high to low in 3 seconds.

The knocking seems to be worse when in drive at a stop. The engine also feels like it wants to shake loose from braking.

I knew that tightening the bolts was too easy.
 
Rev it up and see if you can blow out the bellhousing.

Just for sh!t$ and giggles.
 
Not sure what you mean. Are you thinking that maybe something is jammed in there?
 
he's fockin with ya.... stop driving it... get back in there and recheck the bolts...
 
Could it be the actual torque converter? Maybe it is ballooning and knocking against the bell housing? Would this explain the whistle /pressure sounds?
 
doubtful, usually when tc's balloon, they press forward and f*ck the thrust bearing up in the mill... I'm betting the flexplates fubar'd now...
 
Yep, I was kidding.

I'm going with ryoken: flexplate.

Change it out now or quit driving the truck. You'll do more damage if you do. Don't make my mistake.
 
cameronsaddress said:
Could it be the actual torque converter? Maybe it is ballooning and knocking against the bell housing? Would this explain the whistle /pressure sounds?
Click to expand...


Gotta love working on a 40-year old truck that the previous owner has already "improved" for ya!!!!

The more you look, the more problems you find.....it's inevitable, unfortunately. Good news is that eventually you will have fixed all the crap that the previous incompentent owner did, and you'll have an intimate understanding about EVERY part of your truck by the time you're all done.

That's a silver lining, I suppose. :dunno:


-G
 
Well I just tightened the tran bell housing bolts at the block. They were not very snug.

No knocking now (again )

...fingers crossed,stay tuned :)
 
Greg72 said:
Gotta love working on a 40-year old truck that the previous owner has already "improved" for ya!!!!

The more you look, the more problems you find.....it's inevitable, unfortunately. Good news is that eventually you will have fixed all the crap that the previous incompentent owner did, and you'll have an intimate understanding about EVERY part of your truck by the time you're all done.

That's a silver lining, I suppose. :dunno:


-G
Click to expand...
Or you replace every item on the truck until you almost have a new truck like me doh! :doah:

only sucky part is no matter how much you replace its still a $2k truck. :(

Good part is I dont worry about it when I rub up against a tree.
 
Chevy.... remove rad cap, replace rest of truck, reinstall rad cap.....
 
I found one of the vacuum leaks. It is between the manifold and the block.

Video:
http://plus.google.com/u/0/photos/117142580831503859149/albums/5677933206515603889/5694684954303033778?hl=en

Leak:
6198fa95-91a1-a3e2.jpg




When I plug it with a rag it stops whistling. Can I put a gasket paste on the outside or do I have to pull the intake manifold?

Weird thing though, when I plug it and shut the truck off there is still a pressure release sound coming from the engine / pan / and behind water pump area. So why would the engine be de- pressurizing during turn off all over the place all of the sudden?
 
Last edited:
cameronsaddress said:
I found one of the vacuum leaks. It is between the manifold and the block.

When I plug it with a rag it stops whistling. Can I put a gasket paste on the outside or do I have to pull the intake manifold?
Click to expand...
I think you already know the answer to that. More then likely its the crankcase that is venting through there. If it were a vaccum leak it would have to be the intake port leaking and you have a water jacket between the outside edge and the intake port.

I would at the very least pull the intake replace the $12 intake gaskets and reseal with silicone that area of the block. Not much work or cost to ensure its sealed up right.

Bad rings maybe that is creating a lot of blow by past the rings into the crankcase. I would do a leakdown test.
 
Anyone think that this could be a PCV issue? bad valve?

I wonder if this would create enough pressure to cause issue of it were plugged.

Also, i read that I should have ventilation ports on the valve covers... not sure that I do. where would I check?


Thanks
 
pull the pvc out and shake it, it should rattle.. carb cleaner will clean it.... it will usually have a breather on the other vc...

plan on pulling the intake...
 
you shouldn't have vacuum at that point of the engine....the first port in the cylinder head is a water port.....not an intake port..

now having said that....

There could possibly be enough vacuum being drawn in by the PCV and if there is no other breather on the engine, it will draw the crankcase into a vacuum...

there has to be a breather to let air into the engine also....Do you have a breather on the valve cover ?

If the intake gasket ( the rubber portion) is leaking where it meets the block, It could cause a vacumn sound if the crankcase is being sucked into a negative.....

just a thought....
 
Ok,
I have a pcv valve on right cover:
6198fa95-8045-2fa1.jpg


And oil fill cap on left cover:
6198fa95-8063-d0d3.jpg


I removed the oil fill cap and turned the truck on and there were no vacuum leak sounds anywhere. The pressure release sound at shut off was gone as well.

Should I have a breather instead of a cap? ( what is a breather)

Thanks!!
 
yup.....replace that fill cap with a breather type fill cap...

originally there was a tube that ran up into the air cleaner and had a small filter inside the cleaner lid....
it allowed filtered air to be drawn into the engine and mix with any blowby gases and then be sucked up thru the PCV valve,,mixed with the intake air and fuel charge and burnt in the cylinders.

accord_pcv_657b.gif




you have essentially plugged that incoming air.....

more than likely the engine has been sucking in air past the crank seals and any loose gasket...looks like your intake gaskets finally got sucked in...

Time to pull the intake... there is a rubber/cork gasket along the top of the block on both ends of the engine that the intake seals against...one or both may be sucked in....


a breather looks like this.....
pro-141-616_w_m.jpg
 
You must log in or register to reply here.

Latest Posts

Top Bottom