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post #1 of 34 Old 04-28-2011, 06:47 PM Thread Starter
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Broken timing belt

My timing belt broke while doing 70mph on my 01' 4cyl. accord. My mechanic said that he won't know if I bent valves until he puts a new timing belt. And he's charging $400 for timing belt, water pump, head gasket, etc. what are the odds of having damage the valve? When the belt broke I heard a loud bang underneath the car the whole car shut off and all the lights on the dash turned on. I let the car coast for like 50ft. before stopping on the shoulder.

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post #2 of 34 Old 04-28-2011, 09:10 PM
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If you broke the timing belt while doing 70, you bent valves. All hondas from what I know of are interference engines! Even if you were running at idle and the belt broke you would most likely bend valves. I'd tell that mechanic to pull the valve cover off and check for bent valves. If he's any decent mechanic he would know to check that first. I can't imagine he would want to replace the belt and see if it runs. There is a possibility of doing more damage that way. Just my 2 cents. Just incase you aren't aware, the belt is supposed to be replaced every 105k.

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post #3 of 34 Old 04-28-2011, 09:34 PM
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You need a new Engine
Your valves are bent and along with that your head may also be damaged
You will only need a new Head Gasket if you are putting in a new Head with valves in it.
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post #4 of 34 Old 04-29-2011, 12:03 PM
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I guess he wants to put a new belt on to do a compression test.
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post #5 of 34 Old 04-29-2011, 12:12 PM
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Unhappy Unfortunate Scenario

Definitely agreed with present consensus: Throwing a timing belt in a Honda engine, it's a guarantee you've bent valves. And having the belt blow while at 70MPH is just about a worst-case scenario, at that. In such a circumstance I wouldn't trust the integrity of any internal engine parts. The engine is done, and your safest option is total replacement (or a total engine rebuild).

This highlights the criticality of replacing your timing belt at the recommended interval, and with a belt of known high quality. Failure to do so can result in catasrophic engine damage, so it's probably the last thing you want to skimp on.

I will say that is one thing I appreciate about my Prizm's Toyota engine: At least with that if the timing belt blows, the engine won't.

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post #6 of 34 Old 04-29-2011, 06:36 PM
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He's not guaranteed to bend valves on a 4 cyl sohc. Done quite a few that have survived. Both D series and F series.

He can tell if the valves are bent pre-job. Turn the crank 90 degrees OFF top center.
Put the cam on TDC, check adjustment of valves on cyl 1. If they are far off, loose or jammed tight, there's a problem. He can keep rotating the cam 90 degress ccw, check 3, rotate 90 degrees, check 4, rotate 90 degrees, check 2. if the cam binds when turning or won't turn. Well, there's another problem, like a valve jammed in a guide.

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post #7 of 34 Old 04-29-2011, 10:21 PM Thread Starter
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thanks guys, for all your reply's. I will keep you updated on my situation.
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post #8 of 34 Old 04-30-2011, 01:44 AM
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Quote:
Originally Posted by Fredsvt View Post
He's not guaranteed to bend valves on a 4 cyl sohc. Done quite a few that have survived. Both D series and F series.

He can tell if the valves are bent pre-job. Turn the crank 90 degrees OFF top center.
Put the cam on TDC, check adjustment of valves on cyl 1. If they are far off, loose or jammed tight, there's a problem. He can keep rotating the cam 90 degress ccw, check 3, rotate 90 degrees, check 4, rotate 90 degrees, check 2. if the cam binds when turning or won't turn. Well, there's another problem, like a valve jammed in a guide.
Well the chances are very remote that theres not a single bent valve with 16 valves going at a high rate of speed. Then you break the belt with everything in movement at 70, the chances of bent valves is VERY high. Especially with him saying that he heard a very loud bang is enough evidence for me. I had a 88 Accord blow the belt at 35 and it bent every single valve. Really all he has to do is remove the valve cover and test the valves by pulling up on them to see how much movement they have. You can shouldnt be able to get any slack from the rocker arm (where it touches the valve) if the valve is good. I would be willing to bet that most if not all the valves are shot. Also possible is holes in the pistons.
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post #9 of 34 Old 05-03-2011, 03:39 PM Thread Starter
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Well, my mechanic call me and said that now I need a new crank sensor which was broken in half by the belt. Called Honda dealer and ask about this sensor which is $270. The following day he called me and said that he put the new belt & sensor on and that the car started up fine no shaking or weird noises. I will pick it up tomorrow, but at the dealer I was talking to one of the techs. He told me that honda engines from 92' and up have some type of protection for when the timing belt brakes. My mechanic also said that there was two belts he had replace timing and stablilizing belt. Anyways im still a little skepticle about it, but I will see how the car runs tomorrow.
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post #10 of 34 Old 05-03-2011, 07:17 PM
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Well the chances are very remote that theres not a single bent valve with 16 valves going at a high rate of speed. Then you break the belt with everything in movement at 70, the chances of bent valves is VERY high.
You obviously don't know that Fredsvt is a honda mechanic...

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post #11 of 34 Old 05-03-2011, 07:47 PM
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You obviously don't know that Fredsvt is a honda mechanic...
I don't think FredSVT's expertise is even limited to Honda.

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post #12 of 34 Old 05-04-2011, 07:05 AM
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I would question the mechanic's original diagnosis of a "broken" timing belt if there were no bent valves. Possibly a loose section of the timing belt killed the CPS before the belt totally failed?? A failed CPS would immediately shut down an engine and maybe there was enough belt left to keep the cam in time. Just my thoughts.

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post #13 of 34 Old 05-04-2011, 05:12 PM
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I don't think FredSVT's expertise is even limited to Honda.
This is true.

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post #14 of 34 Old 05-04-2011, 06:38 PM Thread Starter
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UPDATE- OK, so my mechanic finish with my car timing belt, water pump, head gasket, oil change. When he turned the car on the engine started to sputter and check engine light came on. Then he did a compression test on the valves three valves read at 170 and one read at 20. So he tells me that one valve is bent. So now I owe him $700 for sensor, waterpump,timingbelt, etc. So now to do the valve job would be $800 that's putting in new valves. My main concern is paying all this money and still have engine problems. By the way my mechanic is a cousin of mines.
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post #15 of 34 Old 05-04-2011, 07:05 PM
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So he's basically going to have to do everything again, plus remove the head for valve replacement..........

Should have done what FredSVT suggested in his post #6 above first, at least it would have been clear if there is a problem so the head can be removed for the required repair at that point, rather than finding this out after everything has been put back together.


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