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#1
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3.3L V6 - What if I ignore timing chain rattle?
I have a 1990 Dodge Grand Caravan with the 3.3L V6 engine and 130,000
miles on it. I hear a a rattling noise at idle which goes away as the engine speed is increased past the idling speed. Per another thread, it was basically decided that it is likely the timing chain. My question is what if I ignore it? I know at some future point it will break (any thoughts as to how much further down the road?) but aside from the rattling noise, is there any reason I can't just ignore it? Does the rattling chain damage anything else (timing chain cover?) When the chain finally does jump/break, will it damage anything else? Is this an interference engine / will the valves be damaged? Thanks, Eric Kotz |
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#2
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Normally an 1/8 of an inch stretch of a timing chain is considered worn
out. If the chain is exsessively loose it may cause the cam sprocket teeth to break and cause problems. However there are some on here that let there customers wait untill the chain breaks before replacing em. I believe in preventive maintenance. Glenn Beasley Chrysler Tech > wrote in message oups.com... > I have a 1990 Dodge Grand Caravan with the 3.3L V6 engine and 130,000 > miles on it. I hear a a rattling noise at idle which goes away as the > engine speed is increased past the idling speed. Per another thread, > it was basically decided that it is likely the timing chain. > My question is what if I ignore it? I know at some future point it > will break (any thoughts as to how much further down the road?) but > aside from the rattling noise, is there any reason I can't just ignore > it? Does the rattling chain damage anything else (timing chain cover?) > When the chain finally does jump/break, will it damage anything else? > Is this an interference engine / will the valves be damaged? > Thanks, > Eric Kotz > > |
#3
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Well, I know the chain is worn, I guess I'm asking what is the
potential damage to the engine when it finally does go? |
#4
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#5
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AACUDA????
"maxpower" > wrote in message ... > Normally an 1/8 of an inch stretch of a timing chain is considered worn > out. If the chain is exsessively loose it may cause the cam sprocket teeth > to break and cause problems. However there are some on here that let there > customers wait untill the chain breaks before replacing em. I believe in > preventive maintenance. > Glenn Beasley > Chrysler Tech > > > > wrote in message > oups.com... > > I have a 1990 Dodge Grand Caravan with the 3.3L V6 engine and 130,000 > > miles on it. I hear a a rattling noise at idle which goes away as the > > engine speed is increased past the idling speed. Per another thread, > > it was basically decided that it is likely the timing chain. > > My question is what if I ignore it? I know at some future point it > > will break (any thoughts as to how much further down the road?) but > > aside from the rattling noise, is there any reason I can't just ignore > > it? Does the rattling chain damage anything else (timing chain cover?) > > When the chain finally does jump/break, will it damage anything else? > > Is this an interference engine / will the valves be damaged? > > Thanks, > > Eric Kotz > > > > > > |
#6
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Chain or gear breaks. engine damage will occur
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#7
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I've always wished there was some list somewhere for reference as to
which engines "bend valves" (interference engines). You say that "almost all chain-timed engines are interference types." I'm curious as to why that would be. Are pretty much all belt-timed engines OHC? And if so, how would that figure in to whether they're interference engines or not? |
#8
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On Sun, 23 Jan 2005, James Goforth wrote:
> You say that "almost all chain-timed engines are interference types." I can't imagine who told you this, but it must be one of the disreputable types in my killfile. It's not so. |
#9
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The comment about all chain timed engines being interference types was
from a poster just a few posts before mine. And that would be nice if one could automatically know if it was an interference engine just by determining if it used a timing chain vs. belt. I had never heard that either, but it piqued my curiosity in that so many OHC engines are belt timed while pushrod engines are chain--two distinctly different types of engines. Meanwhile, some engines are interference types while certain others are not, but I was never sure why that was or what made the difference. So anyway this got me wondering if one of the main criteria for whether or not an engine is an interference type is whether it's OHC or pushrod. Given the catastrophic damage an interference engine sustains from a failed timing gear, why are these engines not deemed undesireable and thus phased out or redesigned (since so many other engines are non-interference & provide satisfactory performance)? |
#10
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Because if all other things are equivalent, interference design engines can
generally produce higher power output. How many consumers actually know to ask the salesperson if the engine is an interference or non-interference design? (versus) How many ask about the engine's output in horse power? If the consumer actually knew to ask and figured in the timing belt, water pump, etc. replacement cost every few years then in my opinion there would be much more demand for chain driven, non-interference engines. Also, with regard to chains versus timing belts, about all you can really say is that chains generally last longer and require less maintenance during the engine's useful life. A belt is generally easier to change since it does not require complete access to the internals of the engine, but can still be very costly since you need to remove all the periphery, covers, etc. to gain access Bob "James Goforth" > wrote in message ... > Given the catastrophic damage an interference engine sustains from a > failed timing gear, why are these engines not deemed undesireable and > thus phased out or redesigned (since so many other engines are > non-interference & provide satisfactory performance)? > |
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