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#31
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Timing belt question, 99 Honda Accord DX
In article >,
"Forrest" > wrote: > "Elle" > wrote in message > ... > >A person at Honda-tech.com a few years back tossed out that, when a TB > >breaks, it is possible for the cam to be in a position such that all the > >valves are shut. > > I'm no expert on any of this stuff but that doesn't sound possible. I would > think that at any one time, the only cylinder with the valves closed would > be the cylinder on the compression stroke. While it's doing that, the > opposite cylinder, on a 4 cyl engine, is on the exhaust stroke with the > exhaust valves open. Check out this video. > http://www.youtube.com/watch?v=Hhc6x...eature=related Impressive video, thanks. And thanks to all those who contributed in this thread. I will have the TB changed soon. My thinking: I'm hoping to have this car for another 10 years. Obviously for safety's sake I need to have the TB done sometime in that period, and right now makes the most sense given that. |
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#32
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Timing belt question, 99 Honda Accord DX
"Forrest" > wrote
> "Elle" > wrote >>A person at Honda-tech.com a few years back tossed out >>that, when a TB breaks, it is possible for the cam to be >>in a position such that all the valves are shut. > > I'm no expert on any of this stuff but that doesn't sound > possible. I would think that at any one time, the only > cylinder with the valves closed would be the cylinder on > the compression stroke. While it's doing that, the > opposite cylinder, on a 4 cyl engine, is on the exhaust > stroke with the exhaust valves open. Check out this > video. > http://www.youtube.com/watch?v=Hhc6x...eature=related Right, I follow. Perhaps the valves could all land in an intermediate position when the cam stops. I would have to think about it more. I did notice recently at the yard that the "valve reliefs" (those indentations on top of the pistons that I am not sure all or any Hondas have) may certainly be assisting the valves' protection when timing is lost. For all I know whether damage occurs may depend on so much: the engine temperature (higher temp = less clearance?); carbon buildup; which Honda engine we're talking about; manual vs. auto tranny. I wonder if the valves can even be pushed shut (without damaging them) for a number of cycles as the engine comes to a stop. But this may be naive on my part. |
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