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post #1 of 13 (permalink) Old 03-02-2011, 01:01 PM Thread Starter
 
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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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post #2 of 13 (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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post #3 of 13 (permalink) Old 03-02-2011, 01:17 PM
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Quote:
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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post #4 of 13 (permalink) Old 03-02-2011, 01:46 PM
 
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Quote:
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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post #5 of 13 (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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post #6 of 13 (permalink) Old 02-23-2017, 11:50 AM
 
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Hi Larry I have a roadster that just died no bad noises from engine at all dash went dark so figured alternator or battery I had just had replacement battery so took off alternator had that repaired, after fitting went to start it and just had a click one click tapped starter no joy so took started off, garage said they believed something had been catching it slightly, so the cleaned it up and said it works fine now, so I refitted it still the same everything comes on fine but one click engine won't start so jacked up road wheels and have found we cannot turn the crankshaft at all forwards or backwards,do you have any idea what would of caused this as the engine all seems fine in itself but it's not starting as the starter can't turn the flywheel as the crankshaft will not move?? May thanks for any help
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post #7 of 13 (permalink) Old 02-23-2017, 09:39 PM
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Hi Lisa,

I am new here But just answered similar in another thread...

Did you notice this thread is Old? 3/2011...

Just a thought; You might start a new thread Asking your question to get opinions from the Members here...

A Moderator might come along and help you out OR place this question into a New Thread for you...

signed....BUBBIE
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post #8 of 13 (permalink) Old 02-23-2017, 09:57 PM
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Welcome Lisa roadster to SCoA. sounds like you have a pretty serious problem with the motor. It could be a timing chain issue, or a damaged piston, or maybe a cylinder full of gas or water.

I would start by taking out the spark plugs and see if any of them show damage or if they look melted. I would guess the motor will have to come apart and see why it won't move, I would be looking for another motor from a scrap yard .

We don't get many Roadsters on here but the smarts are quite similar and the basic motors are close enough to help with what we can.
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post #9 of 13 (permalink) Old 02-24-2017, 07:38 AM
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Also recommend subscribing to Evilution - Smart Car Encyclopaedia - tons of info on there; you might also try asking for assistance on the smartManiacs site in the UK.
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post #10 of 13 (permalink) Old 02-25-2017, 08:55 AM
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Harley Owner and Smart too IMO

I wonder HOW you tried to spin the engine over off the ground.?

Yes IF it will not turn it may be frozen... BUT you really can't tell as Turning the motor over in Neutral is the way to check, IN Gear by Tires, requires More (***below)...

I do Not know IF you have a Way to turn that motor Over other than the pulley end of the motor. Motor Compression with the plugs IN might Turn Hard Enough to Not turn over by hand...
***Plugs OUT is a better way: allowing No Compression holding the motor movement back...

I really wonder IF the motor is bad? You never said you Checked that New Battery... The Battery could be a Problem...

I'm not up to date on the Smart Car but am a Very good Mechanic on Harley. Just learning here on the Fantastic Smart Car I have...LOL...

If you Have Oil, and Oil looks Clean and You have no Metal grinds if you check there in it, still think the motor might Not be the problem.

IF you want to check the oil for metal running thru the motor, YOU Can remove the oil filter, look at the oil condition there... Also carefully cut filter open and look at the filtering material... IF it shows Metal Grinds then suspect the motor...

More to this than just what I posted here but this will get you started into a Direction of "finding out what it is"

Good Luck...

signed.... BUBBIE
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