2002 Sienna, does it have an interference engine or not?

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Old 03 Jun 2013, 11:51 am   #1 (permalink)
mrdarrett@gmail.com
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Default 2002 Sienna, does it have an interference engine or not?

Subject says it all, thanks

Michael
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Old 03 Jun 2013, 04:26 pm   #2 (permalink)
Don Schmidt
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Default Re: 2002 Sienna, does it have an interference engine or not?

What is an interference engine?


<mrdarrett@gmail.com> wrote in message
news:d8080bf1-804f-41bf-8c95-363724355f33@googlegroups.com...
> Subject says it all, thanks
>
> Michael



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Old 03 Jun 2013, 04:51 pm   #3 (permalink)
mrdarrett@gmail.com
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Default Re: 2002 Sienna, does it have an interference engine or not?

On Monday, June 3, 2013 2:26:04 PM UTC-7, Don Schmidt wrote:
> What is an interference engine?



If you change the timing belt, and it slips, and you continue to rotate the crankshaft with the camshafts out of alignment, the piston can slam into the valves, causing thousands of $$$ in damage.

Same issue if the timing belt comes off during driving. Not that that ever happened to me... (cough) bad water pump... (cough)

If it's non-interference, you don't have to worry - the engine is designed to allow extra space if the pistons go up with the valves opened.

I changed the timing belt on the '99 Camry, and my timing belt slipped a few times (first time, yeah it happens) but since it's a non-interference engine, no big deal, I just had to re-rotate everything to Top Dead Center.

I'm just not that familiar with V6 engines on the Sienna, is all.
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Old 03 Jun 2013, 05:17 pm   #4 (permalink)
Jeff Strickland
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Default Re: 2002 Sienna, does it have an interference engine or not?

It's an engine where if the timing belt/chain breaks, the valves and the
pistons can run into one another.

The general rule of thumb is that a timing belt will be on a
non-interference engine so that if the rubber belt breaks on the freeway the
worst that happens is you are stuck on the side of the road, or center of it
if you can't get over. An interference engine will have a timing chain since
a timing chain should never break.




"Don Schmidt" <Don Engineer@PNB.Retired_1987> wrote in message
news:scWdnXyzj7NalDDMnZ2dnUVZ_vmdnZ2d@posted.palin acquisition...
> What is an interference engine?
>
>
> <mrdarrett@gmail.com> wrote in message
> news:d8080bf1-804f-41bf-8c95-363724355f33@googlegroups.com...
>> Subject says it all, thanks
>>
>> Michael

>
>


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Old 03 Jun 2013, 05:19 pm   #5 (permalink)
Jeff Strickland
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Default Re: 2002 Sienna, does it have an interference engine or not?


<mrdarrett@gmail.com> wrote in message
news:42f04fed-1abe-43f4-9f54-543db950007e@googlegroups.com...
> On Monday, June 3, 2013 2:26:04 PM UTC-7, Don Schmidt wrote:
>> What is an interference engine?

>
>
> If you change the timing belt, and it slips, and you continue to rotate
> the crankshaft with the camshafts out of alignment, the piston can slam
> into the valves, causing thousands of $$$ in damage.
>
> Same issue if the timing belt comes off during driving. Not that that
> ever happened to me... (cough) bad water pump... (cough)
>
> If it's non-interference, you don't have to worry - the engine is designed
> to allow extra space if the pistons go up with the valves opened.
>
> I changed the timing belt on the '99 Camry, and my timing belt slipped a
> few times (first time, yeah it happens) but since it's a non-interference
> engine, no big deal, I just had to re-rotate everything to Top Dead
> Center.
>
> I'm just not that familiar with V6 engines on the Sienna, is all.


If there is a belt, it should be an non-interference engine, if there is a
timing chain then you should expect the pistons and valves to occupy the
same space at the same time if the chain breaks.

If you were an engine maker and there was a chance that the pistons and
valves would collide at some point, would you drive the valves with a belt
or a chain?


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Old 03 Jun 2013, 05:37 pm   #6 (permalink)
mrdarrett@gmail.com
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Default Re: 2002 Sienna, does it have an interference engine or not?

On Monday, June 3, 2013 3:19:28 PM UTC-7, Jeff Strickland wrote:
> <mrdarrett@gmail.com> wrote in message
>
> news:42f04fed-1abe-43f4-9f54-543db950007e@googlegroups.com...
>
> > On Monday, June 3, 2013 2:26:04 PM UTC-7, Don Schmidt wrote:

>
> >> What is an interference engine?

>
> >

>
> >

>
> > If you change the timing belt, and it slips, and you continue to rotate

>
> > the crankshaft with the camshafts out of alignment, the piston can slam

>
> > into the valves, causing thousands of $$$ in damage.

>
> >

>
> > Same issue if the timing belt comes off during driving. Not that that

>
> > ever happened to me... (cough) bad water pump... (cough)

>
> >

>
> > If it's non-interference, you don't have to worry - the engine is designed

>
> > to allow extra space if the pistons go up with the valves opened.

>
> >

>
> > I changed the timing belt on the '99 Camry, and my timing belt slipped a

>
> > few times (first time, yeah it happens) but since it's a non-interference

>
> > engine, no big deal, I just had to re-rotate everything to Top Dead

>
> > Center.

>
> >

>
> > I'm just not that familiar with V6 engines on the Sienna, is all.

>
>
>
> If there is a belt, it should be an non-interference engine, if there is a
>
> timing chain then you should expect the pistons and valves to occupy the
>
> same space at the same time if the chain breaks.
>
>
>
> If you were an engine maker and there was a chance that the pistons and
>
> valves would collide at some point, would you drive the valves with a belt
>
> or a chain?



If I were an engine maker I'd do whatever my boss told me to do... ahahahaha. Plenty of times at work I thought something boss wanted was ludicrous, and said so, then boss took a deep breath and said, "One more time... I want you to..."

Economics dictate some of it too...

I found somewhere that the VVT-i 1MZ-FE engines are interference. Yay. I happen to have a VVT-i...

Cheers,

Michael
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Old 03 Jun 2013, 06:11 pm   #7 (permalink)
Jeff Strickland
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Default Re: 2002 Sienna, does it have an interference engine or not?


<mrdarrett@gmail.com> wrote in message
news:c7534500-81ba-4e94-82d6-028ff0f96933@googlegroups.com...
> On Monday, June 3, 2013 3:19:28 PM UTC-7, Jeff Strickland wrote:
>> <mrdarrett@gmail.com> wrote in message
>>
>> news:42f04fed-1abe-43f4-9f54-543db950007e@googlegroups.com...
>>
>> > On Monday, June 3, 2013 2:26:04 PM UTC-7, Don Schmidt wrote:

>>
>> >> What is an interference engine?

>>
>> >

>>
>> >

>>
>> > If you change the timing belt, and it slips, and you continue to rotate

>>
>> > the crankshaft with the camshafts out of alignment, the piston can slam

>>
>> > into the valves, causing thousands of $$$ in damage.

>>
>> >

>>
>> > Same issue if the timing belt comes off during driving. Not that that

>>
>> > ever happened to me... (cough) bad water pump... (cough)

>>
>> >

>>
>> > If it's non-interference, you don't have to worry - the engine is
>> > designed

>>
>> > to allow extra space if the pistons go up with the valves opened.

>>
>> >

>>
>> > I changed the timing belt on the '99 Camry, and my timing belt slipped
>> > a

>>
>> > few times (first time, yeah it happens) but since it's a
>> > non-interference

>>
>> > engine, no big deal, I just had to re-rotate everything to Top Dead

>>
>> > Center.

>>
>> >

>>
>> > I'm just not that familiar with V6 engines on the Sienna, is all.

>>
>>
>>
>> If there is a belt, it should be an non-interference engine, if there is
>> a
>>
>> timing chain then you should expect the pistons and valves to occupy the
>>
>> same space at the same time if the chain breaks.
>>
>>
>>
>> If you were an engine maker and there was a chance that the pistons and
>>
>> valves would collide at some point, would you drive the valves with a
>> belt
>>
>> or a chain?

>
>
> If I were an engine maker I'd do whatever my boss told me to do...
> ahahahaha. Plenty of times at work I thought something boss wanted was
> ludicrous, and said so, then boss took a deep breath and said, "One more
> time... I want you to..."
>
> Economics dictate some of it too...
>
> I found somewhere that the VVT-i 1MZ-FE engines are interference. Yay. I
> happen to have a VVT-i...
>
> Cheers,
>
> Michael


I don't want to argue with you, but economics says that if the engine parts
will have a fatal collision during the warranty period, then it would be
cheaper to use a chain than a belt. And, no matter the parts cost, it is
passed on to the car buyers, so the engine design would not be affected by
this constraint. Yes, they could ask, "How can we make this engine $50
cheaper?" and the answer would be, use a belt instead of a chain.

But the general rule of thumb is that if the pistons and valves can occupy
the same space at the same time, there is probably a chain.



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Old 03 Jun 2013, 10:38 pm   #8 (permalink)
Geoff Welsh
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Default Re: 2002 Sienna, does it have an interference engine or not?

Jeff Strickland wrote:
>
> <mrdarrett@gmail.com> wrote in message
> news:c7534500-81ba-4e94-82d6-028ff0f96933@googlegroups.com...
>> On Monday, June 3, 2013 3:19:28 PM UTC-7, Jeff Strickland wrote:
>>> <mrdarrett@gmail.com> wrote in message
>>>
>>> news:42f04fed-1abe-43f4-9f54-543db950007e@googlegroups.com...
>>>
>>> > On Monday, June 3, 2013 2:26:04 PM UTC-7, Don Schmidt wrote:
>>>
>>> >> What is an interference engine?
>>>
>>> >
>>>
>>> >
>>>
>>> > If you change the timing belt, and it slips, and you continue to
>>> rotate
>>>
>>> > the crankshaft with the camshafts out of alignment, the piston can
>>> slam
>>>
>>> > into the valves, causing thousands of $$$ in damage.
>>>
>>> >
>>>
>>> > Same issue if the timing belt comes off during driving. Not that that
>>>
>>> > ever happened to me... (cough) bad water pump... (cough)
>>>
>>> >
>>>
>>> > If it's non-interference, you don't have to worry - the engine is >
>>> designed
>>>
>>> > to allow extra space if the pistons go up with the valves opened.
>>>
>>> >
>>>
>>> > I changed the timing belt on the '99 Camry, and my timing belt
>>> slipped > a
>>>
>>> > few times (first time, yeah it happens) but since it's a >
>>> non-interference
>>>
>>> > engine, no big deal, I just had to re-rotate everything to Top Dead
>>>
>>> > Center.
>>>
>>> >
>>>
>>> > I'm just not that familiar with V6 engines on the Sienna, is all.
>>>
>>>
>>>
>>> If there is a belt, it should be an non-interference engine, if there
>>> is a
>>>
>>> timing chain then you should expect the pistons and valves to occupy the
>>>
>>> same space at the same time if the chain breaks.
>>>
>>>
>>>
>>> If you were an engine maker and there was a chance that the pistons and
>>>
>>> valves would collide at some point, would you drive the valves with a
>>> belt
>>>
>>> or a chain?

>>
>>
>> If I were an engine maker I'd do whatever my boss told me to do...
>> ahahahaha. Plenty of times at work I thought something boss wanted was
>> ludicrous, and said so, then boss took a deep breath and said, "One
>> more time... I want you to..."
>>
>> Economics dictate some of it too...
>>
>> I found somewhere that the VVT-i 1MZ-FE engines are interference. Yay.
>> I happen to have a VVT-i...
>>
>> Cheers,
>>
>> Michael


> .....
> But the general rule of thumb is that if the pistons and valves can
> occupy the same space at the same time, there is probably a chain.
>


Since we don't live in fantasy land, a rule of thumb is useless. Some
engines with belts are interference, some are not. If you work at a
shop, you look up every one individually if the belt already broke to
find out for sure.

this is an example list, although not the resource I used at the shop:

http://www.agcoauto.com/content/List...erence_Engines

GW
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Old 04 Jun 2013, 07:52 pm   #9 (permalink)
uncle_vito
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Default Re: 2002 Sienna, does it have an interference engine or not?

You would think, but I had one break. Give it enough mileage, chains will
stretch and then break.


"Jeff Strickland" <crwlrjeff@yahoo.com> wrote in message
news:koj4ck$np1$1@dont-email.me...
> It's an engine where if the timing belt/chain breaks, the valves and the
> pistons can run into one another.
>
> The general rule of thumb is that a timing belt will be on a
> non-interference engine so that if the rubber belt breaks on the freeway
> the worst that happens is you are stuck on the side of the road, or center
> of it if you can't get over. An interference engine will have a timing
> chain since a timing chain should never break.
>
>
>
>
> "Don Schmidt" <Don Engineer@PNB.Retired_1987> wrote in message
> news:scWdnXyzj7NalDDMnZ2dnUVZ_vmdnZ2d@posted.palin acquisition...
>> What is an interference engine?
>>
>>
>> <mrdarrett@gmail.com> wrote in message
>> news:d8080bf1-804f-41bf-8c95-363724355f33@googlegroups.com...
>>> Subject says it all, thanks
>>>
>>> Michael

>>
>>

>



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Old 04 Jun 2013, 09:06 pm   #10 (permalink)
Hachiroku ハチロク
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Default Re: 2002 Sienna, does it have an interference engine or not?

On Mon, 03 Jun 2013 16:11:32 -0700, Jeff Strickland wrote:

> <mrdarrett@gmail.com> wrote in message
> news:c7534500-81ba-4e94-82d6-028ff0f96933@googlegroups.com...
>> On Monday, June 3, 2013 3:19:28 PM UTC-7, Jeff Strickland wrote:
>>> <mrdarrett@gmail.com> wrote in message
>>>
>>> news:42f04fed-1abe-43f4-9f54-543db950007e@googlegroups.com...
>>>
>>> > On Monday, June 3, 2013 2:26:04 PM UTC-7, Don Schmidt wrote:
>>>
>>> >> What is an interference engine?
>>>
>>>
>>> >
>>>
>>> >
>>> > If you change the timing belt, and it slips, and you continue to
>>> > rotate
>>>
>>> > the crankshaft with the camshafts out of alignment, the piston can
>>> > slam
>>>
>>> > into the valves, causing thousands of $$$ in damage.
>>>
>>>
>>> >
>>> > Same issue if the timing belt comes off during driving. Not that
>>> > that
>>>
>>> > ever happened to me... (cough) bad water pump... (cough)
>>>
>>>
>>> >
>>> > If it's non-interference, you don't have to worry - the engine is
>>> > designed
>>>
>>> > to allow extra space if the pistons go up with the valves opened.
>>>
>>>
>>> >
>>> > I changed the timing belt on the '99 Camry, and my timing belt
>>> > slipped a
>>>
>>> > few times (first time, yeah it happens) but since it's a
>>> > non-interference
>>>
>>> > engine, no big deal, I just had to re-rotate everything to Top Dead
>>>
>>> > Center.
>>>
>>>
>>> >
>>> > I'm just not that familiar with V6 engines on the Sienna, is all.
>>>
>>>
>>>
>>> If there is a belt, it should be an non-interference engine, if there
>>> is a
>>>
>>> timing chain then you should expect the pistons and valves to occupy
>>> the
>>>
>>> same space at the same time if the chain breaks.
>>>
>>>
>>>
>>> If you were an engine maker and there was a chance that the pistons
>>> and
>>>
>>> valves would collide at some point, would you drive the valves with a
>>> belt
>>>
>>> or a chain?

>>
>>
>> If I were an engine maker I'd do whatever my boss told me to do...
>> ahahahaha. Plenty of times at work I thought something boss wanted was
>> ludicrous, and said so, then boss took a deep breath and said, "One
>> more time... I want you to..."
>>
>> Economics dictate some of it too...
>>
>> I found somewhere that the VVT-i 1MZ-FE engines are interference. Yay.
>> I happen to have a VVT-i...
>>
>> Cheers,
>>
>> Michael

>
> I don't want to argue with you, but economics says that if the engine
> parts will have a fatal collision during the warranty period, then it
> would be cheaper to use a chain than a belt. And, no matter the parts
> cost, it is passed on to the car buyers, so the engine design would not
> be affected by this constraint. Yes, they could ask, "How can we make
> this engine $50 cheaper?" and the answer would be, use a belt instead of
> a chain.
>
> But the general rule of thumb is that if the pistons and valves can
> occupy the same space at the same time, there is probably a chain.




Nope....Rules of Thumb suck. That said, the Rule of Thumb for Toyota
engines is, if it is a SOHC it is probably interference, if it is a DOHC
it is probably not.

And, I believe Toyota has gone back to chains on all of their engines.
But that still has had problems, like the chain tensioners on the 22R
series that would wear away after ~180,000 miles or so, usually more.
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