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Nairaland Forum / Nairaland / General / Car Talk / Sienna 2006: Fixing A Significant Power Loss Problem (1302 Views)
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Sienna 2006: Fixing A Significant Power Loss Problem by TRYGO(m): 11:13am On Nov 13, 2021 |
In engineering practice, we tend to solve problems, from the least to the complex. That way, one won't be trying to solve an issue, without understanding the basics first! In today's, attempt to identify, and profer solutions to a significant power loss experienced by a client of this Siena vehicle, after our investigations on the least suspects of systems or parts, that could be the culprit, and all checked good, we discovered as we went further in the diagnosis, that major some major work was donee on the client's engine, which needed reviewing. So now, here we go! 1. The vehicle's timing belt, which was supposed to be a maintenance item, had never been replaced, since it was imported into Nigeria from the USA. The belt was shredded, with it's ribbons worn out. Engines with timing belts and not chains, require that the timing belt(s), be replaced at particular intervals recommended by the manufacturer. Not doing this, would result into an underperforming vehicle, and may lead to engine damage, if the engine was an inteference one. 2. Crankshaft pulley, crankshaft sprocket keyways, were all damaged, including the "key" itself was crushed. This, and the shredded timing chain belt, was the reasons a P0335 crankshaft sensor "A" circuit was on display on our sccantool, leading to the loss of power problem. The fix?! Yeah, what we did was not just going ahead and replacing parts, but we went a further mile, identifying what actually triggered all these chain reactions that resulted in to this customer's vehicle problem. All damaged parts, identified, were replaced, and vehicle testdriven to ascertain state of repairs. Note: Don't ignore engine noises, and a P0335 trouble codes on a scantool, when you get such results from scans ran. Pls try to fix such issues. They don't disappear on their own. You got to fix the root cause(s) of the problem, before they clear. Regards, Joseph
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Re: Sienna 2006: Fixing A Significant Power Loss Problem by TRYGO(m): 11:19am On Nov 13, 2021 |
Figure showing damaged and replaced parts displayed side by side.
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Re: Sienna 2006: Fixing A Significant Power Loss Problem by TRYGO(m): 11:26am On Nov 13, 2021 |
On display also
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Re: Sienna 2006: Fixing A Significant Power Loss Problem by TRYGO(m): 11:31am On Nov 13, 2021 |
Comparison of both crankshaft pulleys. The old one has its keyway damaged, due to a crushed crankshaft key.
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Re: Sienna 2006: Fixing A Significant Power Loss Problem by TRYGO(m): 11:37am On Nov 13, 2021 |
Take a look at the damaged timing belt
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Re: Sienna 2006: Fixing A Significant Power Loss Problem by TRYGO(m): 11:42am On Nov 13, 2021 |
Got another crankshaft"key" as a replacement for the crushed one shown here.
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Re: Sienna 2006: Fixing A Significant Power Loss Problem by TRYGO(m): 11:47am On Nov 13, 2021 |
Take a closer look at the crankshaft gear(sprocket) key. The old one has it's keyway diameter expanded as a result of the crushed keyway, as compared to the normal diameter of the replacement.
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Re: Sienna 2006: Fixing A Significant Power Loss Problem by aryzgreat: 5:39pm On Nov 14, 2021 |
TRYGO: The belt was shredded, with it's ribbons worn out. But the belt Im seeing is not shredded |
Re: Sienna 2006: Fixing A Significant Power Loss Problem by TRYGO(m): 1:41am On Nov 21, 2021 |
aryzgreat: Yeah!!!! You're correct na. |
Re: Sienna 2006: Fixing A Significant Power Loss Problem by hedrez: 11:43pm On Dec 08, 2021 |
Good job bro 1 Like |
(1) (Reply)
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