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#1 (permalink) Old 03-02-2011, 01:01 PM
 
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Timing Chain or Belt?

My 2008 smart is approaching the 84,000 mile mark and I would like to know:
Does the car have a timing chain?
Is the engine an interference engine (the valves mash into the head if the belt/chain breaks?

When do you change or inspect for a new belt chain?
I believe it has a chain and is an interference type engine

I have had so many problems with my smart I just don't want to spend more money on it ( 2 clutches, 3 coils, 2 rear seals, new oil pan plus many other smaller items.
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#2 (permalink) Old 03-02-2011, 01:14 PM
 
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Yes, it has a timing chain. if the chain breaks, wouldn't the valve springs keep the valves closed? Sorry to hear that you have had so many trials and travails
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#3 (permalink) Old 03-02-2011, 01:17 PM
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Originally Posted by gurps View Post
Yes, it has a timing chain. if the chain breaks, wouldn't the valve springs keep the valves closed? Sorry to hear that you have had so many trials and travails

The cams will stop where they are, on top of a lobe or not, so some of the valves will stay open. I believe it is an interference engine, but not 100% sure.
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#4 (permalink) Old 03-02-2011, 01:46 PM
 
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Originally Posted by WhiteNBlack08 View Post
The cams will stop where they are, on top of a lobe or not, so some of the valves will stay open. I believe it is an interference engine, but not 100% sure.
This is absolutely correct as I've taken my engine apart more then anyone on here...

As far as replacing the chain, I don't think you have anything to worry about. Being an auto mechanic we typically replace timing belts around 100k miles and visually check for cracks, splits etc but that's the nature of rubber but the chain itself is metal and on the factory engine there's not enough abuse going on to warrant you to worry about the chain.

Sorry to hear about the other things you had to replace, the clutch are disposal item that probably got worn out due to electrical and control issues... coils are electrical issues but the chain is metal and since it worked til now I don't see why there's any reason why it'll stop working.

Larry
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#5 (permalink) Old 03-02-2011, 02:13 PM
 
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Most timing chains on modern engines are designed to last the life of the motor. Tensioners and guides fail more commonly but can also last the life of the motor but they do wear quite a bit and can fail. . The timing chains are much better today , Pontiac back in day for example used nylon teeth on the cam gear, it was usually history by 50k and sometimes the nylon would flake off and clog the oil passages destroying the motor .
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