I have a strange engine "rattle". It's very quiet and isn't like anything
I've heard. it doesn't disapear above idle. Could this be the timing chain?

Jeep is 89YJ 4.2I, 293,000KM

Other than a roller, I've never heard a chain make any noise. It's
possible you may be hearing the fuel pump, but more than likely it's the
normal wear like piston slap, rod and main bearing knock, three hundred
thousand miles brings.
God Bless America, ßill O|||||||O
mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/

Pi-Eyed Piper wrote:

293KM.. not miles. no real way to isolate it? it burns no oil, loads of
power, lots of compression...



"L.W. ("ßill") Hughes III" <billhughes (AT) cox (DOT) net> wrote

Pi-Eyed Piper did pass the time by typing:
Possible small crack in exhaust header

What does it do in N, D, R

--
DougW

I just replaced the stock exhaust with a pacesetter header...I'll check that
though
"DougW" <post.replies (AT) invalid (DOT) address> wrote

Pi-Eyed Piper did pass the time by typing:
Might have to give the manifold bolts another snugging.

Although usually that type of a noise will go away as the
header warms up and expands.

--
DougW

I'll try that....I just dont want it to be engine noise, I wanted another
year before I heard any of that...


"DougW" <post.replies (AT) invalid (DOT) address> wrote

I'll put my money on Doug's suggestion, you forgot to retorque the
header bolts after hot and again each week until they no long snug up.
You may need a new gasket now.
Bearing noise we will change pitch with RPM.
God Bless America, ßill O|||||||O
mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/

Pi-Eyed Piper wrote:

could be...I retourqued them a week later but who knows....If thats all it
is, awesome.


"L.W. ("ßill") Hughes III" <billhughes (AT) cox (DOT) net> wrote

You need to retorque them 3 or 4 times. As Bill said, if they start to
leak, you can burn though and have to start over with a new gasket.

Pi-Eyed Piper wrote: