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Car Forum / Jeep / April 2005strange enginr "rattle" timing chain?
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@aol.com http://www.billhughes.com/ > 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 293KM.. not miles. no real way to isolate it? it burns no oil, loads of power, lots of compression... > 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 [quoted text clipped - 8 lines] >> >> Jeep is 89YJ 4.2I, 293,000KM Pi-Eyed Piper did pass the time by typing: > 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 Possible small crack in exhaust header What does it do in N, D, R  SignatureDougW I just replaced the stock exhaust with a pacesetter header...I'll check that though > Pi-Eyed Piper did pass the time by typing: >> I have a strange engine "rattle". It's very quiet and isn't like anything [quoted text clipped - 6 lines] > > What does it do in N, D, R Pi-Eyed Piper did pass the time by typing: > I just replaced the stock exhaust with a pacesetter header...I'll check that > though 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. SignatureDougW I'll try that....I just dont want it to be engine noise, I wanted another year before I heard any of that... > Pi-Eyed Piper did pass the time by typing: >> I just replaced the stock exhaust with a pacesetter header...I'll check [quoted text clipped - 5 lines] > Although usually that type of a noise will go away as the > header warms up and expands. 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@aol.com http://www.billhughes.com/ > 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. > 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. [quoted text clipped - 5 lines] >> I'll try that....I just dont want it to be engine noise, I wanted another >> year before I heard any of that... 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. > could be...I retourqued them a week later but who knows....If thats all it > is, awesome. [quoted text clipped - 8 lines] >>>I'll try that....I just dont want it to be engine noise, I wanted another >>>year before I heard any of that... not the header, checked lastnight....theres about 20 degrees of turn in the timing chain....gonna give that a try. > 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. [quoted text clipped - 12 lines] >>>>another >>>>year before I heard any of that... 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 > not the header, checked lastnight....theres about 20 degrees of turn in the > timing chain....gonna give that a try. [quoted text clipped - 15 lines] > >>>>another > >>>>year before I heard any of that... wow, I thought that seemed like a lot...I'm at a loss it's not exhaust, wrong side. > Even new, the chain has an easy 15, but 20 is pushing it. > [quoted text clipped - 23 lines] >> >>>>another >> >>>>year before I heard any of that... Pi-Eyed Piper did pass the time by typing: > wow, I thought that seemed like a lot...I'm at a loss > > it's not exhaust, wrong side. Do you have one of these? If not, you should get one. http://www2.northerntool.com/product-1/385487.htm 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. SignatureDougW 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 > Pi-Eyed Piper did pass the time by typing: >> wow, I thought that seemed like a lot...I'm at a loss [quoted text clipped - 8 lines] > the I6 a rattle (tapping/ticking) sound will happen when > the bushing goes out. > 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 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. And the stethoscope doesn't have to be fancy, just a three foot section of garden hose works perfect. God Bless America, ßill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > 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 [quoted text clipped - 4 lines] > (top/back/bottom/front/etc). Replacing a timing chain as a preventative is > probably more work than needed. 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 > wow, I thought that seemed like a lot...I'm at a loss > [quoted text clipped - 27 lines] > >> >>>>another > >> >>>>year before I heard any of that... 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 was amazed when I changed one and still had almost 17 deg of slop. > That is with new steel wheels and chain. [quoted text clipped - 56 lines] >> >> >>>>another >> >> >>>>year before I heard any of that... 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.... That is a really good catch there Robb. Those clutch fans can make some strange noises as they go bad. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's > 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.... > > -- > Message posted via http://www.carkb.com Or perhaps water pump bearings ? Dave Milne, Scotland '91 Grand Wagoneer, '99 TJ > That is a really good catch there Robb. > [quoted text clipped - 10 lines] > > -- > > Message posted via http://www.carkb.com Maybe, but usually it's leaking pretty bad by the time we can hear the bearings. God Bless America, ßill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > Or perhaps water pump bearings ? > > Dave Milne, Scotland > '91 Grand Wagoneer, '99 TJ Thanks Mike, My Jeep is "LEARNING ME". Quite a few things unique to jeeps I'm finding out. |
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