Re: Engine Knock Right at Engine Start only!!

On May 5, 11:57=A0am, "Randal O'Brian" <ROBRI...@[EMAIL PROTECTED]
> wrote:
> "Dunamis" <u43397@[EMAIL PROTECTED]
> wrote in messagenews:83af08b03e6ec@[EMAIL PROTECTED]
> > I'm trying to get as much research for this as I possibly can before
> > taking
> > action. Any info you guys could provide would be greatly appreciated!
>
> > My Situation:
>
> > Sometimes when I go to start my truck, I will turn the engine over and
> > when
> > it fires up there are a series of 4 knocks and then it goes away. Each
a=
nd
> > every time it does it, it's four knocks. It usually happens after the
> > engine
> > has been sitting for the night. I took my truck to a mechanic
concerning=

> > this
> > "knock". He said it sounded like front/rear main bearings or possibly
th=
e
> > crank shaft, but he could not tell which area it came from. What
puzzled=

> > him
> > is that it only "knocked" four times and then went away. After that,
> > everything sounded perfect. Absolutely NO ENGINE NOISE WHAT SO EVER.
He
> > commented that the truck ran remarkably well.
>
> > Info I recieved from another forum:
>
> > this is most likely a problem with the crankshaft main bearings.
general=

> > motors had a bulletin on this when these engines were new and the fix
wa=
s
> > to
> > measure the main bearings and install oversized bearings on the mains.
> > they
> > also note that this will not affect the longevity of the engine.
bottom
> > line
> > is leave it alone.
>
> > Do you guys concur with this response?
>
> > Thank you for your input!
>
> > Phil
>
> It is simply the hydraulic lifters pumping back up after leaking down
> overnight. =A0Engines have been doing this ever since hydraulic lifters
we=
re
> invented. =A0There is nothing wrong, they are working like they are
suppos=
ed
> to. =A0 Seehttp://en.wikipedia.org/wiki/Hydraulic_lifters=A0if
you don't
> understand.
>
> Randal- Hide quoted text -
>
> - Show quoted text -

Well...now theres "rattle" and there's "tick tick tick". If its rattle
rattle rattle, Im leaning towards rod/crank bearing. If its "tick tick
tick" then definately lifters. This has been my experience anyway.