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Oct 14, 2019 10:20:16 GMT
Post by philip42h on Oct 14, 2019 10:20:16 GMT
OK, so I'm confused ... which isn't too difficult these days ...  Roger has a 2011 2.2 diesel - which is essentially the same engine as mine so the service schedules should be the same. Mine has a timing belt that is due to be changed at 100,000 miles or 10 years whichever comes sooner. The multi V-belt tension and condition gets inspected after 60,000 miles or 6 years and thereafter every 10,000 miles or annually - with no defined schedule for replacement. As far as I am aware, the timing belt does timing and the V-belt simply transfers power to ancillary components ... not so? no timing belt on mine it is a chain. ... and, a little more research later, I'm pretty certain mine does too.  The replacement of the timing belt I referred to comes from the service schedule "For Vehicles following 10,000 miles service intervals" so I can readily believe that this 'line' does not apply to vehicles with timing chains. So, does this mean that the timing chain is good for the life of the engine and requires no specific servicing or scheduled replacement? I ask only out of curiosity and for the sake of deconfusement ... while I continue to own my current car it is most likely to be serviced by Mr. T in accordance with the proscribed maintenance schedule ... |
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Oct 14, 2019 11:37:28 GMT
Post by widge on Oct 14, 2019 11:37:28 GMT
OK, so I'm confused ... which isn't too difficult these days ... Roger has a 2011 2.2 diesel - which is essentially the same engine as mine so the service schedules should be the same. Mine has a timing belt that is due to be changed at 100,000 miles or 10 years whichever comes sooner. The multi V-belt tension and condition gets inspected after 60,000 miles or 6 years and thereafter every 10,000 miles or annually - with no defined schedule for replacement. As far as I am aware, the timing belt does timing and the V-belt simply transfers power to ancillary components ... not so? no timing belt on mine it is a chain. Sorry I may have confused the conversation as I took the reference to serpentine belt to mean cam belt.
Dave
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Post by firemac on Oct 14, 2019 15:30:49 GMT
no timing belt on mine it is a chain. ... and, a little more research later, I'm pretty certain mine does too.  The replacement of the timing belt I referred to comes from the service schedule "For Vehicles following 10,000 miles service intervals" so I can readily believe that this 'line' does not apply to vehicles with timing chains. So, does this mean that the timing chain is good for the life of the engine and requires no specific servicing or scheduled replacement? I ask only out of curiosity and for the sake of deconfusement ... while I continue to own my current car it is most likely to be serviced by Mr. T in accordance with the proscribed maintenance schedule ... If it is a good quality duplex chain (i.e. a double row of rollers between the links) and oil and filter are changed regulary (at least annually) then it should never need replacement. If however it is a simplex chain (single rollers) - like the chocolate ones that BMW have started using! - then oil and filter quality and frequency of oil changes are critical to its lifespan. Tensioners are also very important so best to avoid the plastice ones (again such as used in BMWs) as they become brittle over time, break up and cause the chain to jump sprockets or break through fatigue causing terminal engine damage.
Certainly there are good quality simplex chains (and they are getting better owing to newer materials and strong QC procedures in manufacturing them) and generally speaking, chains are a better bet than belts. But both are fine as long as the engine is maintained with a reasonable degree of sympathy. I am strongly in favour of regular engine maintenance regimes, e.g 12 months/12K miles max and with these a chain in particular, since it is lubed by engine oil, should last the life of the car. With condition-based service schedules such as BMW's abortion, the simplex timing chain in particular has little chance of survival when the oil and filter may only be changed after 20K miles or 24 months, say. At that point the chain has been lubed for quite some time by the equivalent of 3-in-1 oil!
I think that some of the bigger capacity Toyota engines have used duplex chains and the smaller ones such as in the Yaris and Aygo, are simplex. In any event Toyota's quality seems very good so I'd be happy with either in a Toyota.
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