strange enginr "rattle" timing chain?

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

Pi-Eyed Piper did pass the time by typing:

Possible small crack in exhaust header

What does it do in N, D, R

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.

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

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

not the header, checked lastnight....theres about 20 degrees of turn in the timing chain....gonna give that a try.

Even new, the chain has an easy 15, but 20 is pushing it.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Pi-Eyed Piper wrote:

wow, I thought that seemed like a lot...I'm at a loss

it's not exhaust, wrong side.

Pi-Eyed Piper did pass the time by typing:

Do you have one of these? If not, you should get one.

Take a listen to the distributor, actually take a look into the base and see if there is oil in there. On the I6 a rattle (tapping/ticking) sound will happen when the bushing goes out.

yep, I have one.

this rattle isn't really rythmic at all. Not like a lifter. it's more like the sound of a nut or bolt bouncing around in a tight spot, but really quiet. I'm gonna do the timing chain anyway, if thats not it (which it probably isn't) its one less thing I'll need to worry about

I was amazed when I changed one and still had almost 17 deg of slop. That is with new steel wheels and chain.

They can start rattling on the cast guide when they get too stretched though. The marks on the inside cover will tell you, if the cast guide isn't worn, the chain is fine.

A cheap auto stethoscope that most parts stores sell is great for pegging noise.

I once told a new acquaintance I met from this group when I met him that I heard bearing knocks at #1, #3, #4, #6 and maybe another up front on his recently 'rebuilt' 258.

I laughed and said ok, this stethoscope is just too much, I hear too much, LOL!

Well, a couple weeks later he spun a bearing and the 'rebuild' had mixed up bearing caps so all the knocks I heard were valid.....

I helped rebuild that engine between Xmas and New Years at -20C in an unheated garage.... He only lived around the corner, literally.

Mike

Pi-Eyed Piper wrote:

I hope the cover is scored...I dont want anyone to tell me im gonna be rebuilding this engine. one more year, just ONE more.

I had a valve rocker work it's way loose. Clattered something nasty. Didn't wreck anything though. But this was on a 2.8L V6 so it may be less relevant.

Never underestimate the value of using a stethoscope to isolate the source of a noise. Narrow down exactly what side of the engine it's coming from (top/back/bottom/front/etc). Replacing a timing chain as a preventative is probably more work than needed.

one thing you might want to check is your fan itself. The name is evading me right now, but they have the temp sensitive fan clutch on them. Mine went out at 80 thousand miles....