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#1 (permalink) Old 08-19-2010, 10:13 AM
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Timming Belt/Chain and Water Pump on Smart

When is the Timming Belt or Timming Chain / Water pump due to be replaced? At how many miles?
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#2 (permalink) Old 08-19-2010, 10:37 AM
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Theoretically 60k... I had smart center Sarasota look at it at 66k and I had to force them to do it... it was still in good condition.
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#3 (permalink) Old 08-19-2010, 03:54 PM
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Originally Posted by Wdhitch View Post
Theoretically 60k... I had smart center Sarasota look at it at 66k and I had to force them to do it... it was still in good condition.
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#4 (permalink) Old 08-19-2010, 05:41 PM
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No Wdhitch. He said Timing Belt/Chain.

It's got a chain Micro, haven't a clue when it wears beyond use. I could have sworn I have heard from a reputable source around 150k-200k but DO NOT quote me on it. I would suspect the water pump is right around the same.
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#5 (permalink) Old 08-19-2010, 07:05 PM
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I would say when the old one breaks. Preventative I would say 100-150K
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#6 (permalink) Old 08-19-2010, 09:51 PM
 
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Normally, a timing chain does not have a catastrophic failure like a belt breaking. It simply stretches over time (hours of running) until either the tensioner can't keep it tight or the crank to cam timing shifts enough to affect the performance of the motor. There should be no periodic replacement of the chain. I once replaced a timing chain on a Saab I owned that had 270,000 miles on it. The slack in the chain was causing the ignition timing to float causing rough idle. Nothing was actually broken but I replaced it to get the motor back to optimal running condition. I sold the car later with somewhere around 295,000 on the clock and the motor was still running like a fine timepiece.
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#7 (permalink) Old 08-19-2010, 09:53 PM
 
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Oh, and a water pump gets replaced when it starts leaking. Or, in rare cases, if the coolant gets dirty and causes excessive wear of the pump's vane reducing the coolant flow which can lead to overheating.
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#8 (permalink) Old 08-20-2010, 06:41 AM
 
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On the smarts with the 599/698 and 799 cc engines, the plastic chain tensioners can break, the chains can then jump the cog and all sorts of fun ensues. The oil pump chain is especially one to be wary of. Not sure about the Mitsu engine.
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#9 (permalink) Old 08-20-2010, 03:41 PM
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Thanks every one is very informative. Im glad the smart has a timming chain vs timming belt..Amen 2 that..
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#10 (permalink) Old 08-20-2010, 05:26 PM
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I've had two cars of mine jump a tooth on the chain (both 289 Fords). Both because they were stretched.

I am currently working on an Escort with 197k and the water pump IMO was due for a change as the bearing was having some play - a whooping $16 and I swapped it out.
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