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·
Discussion Starter · #1 ·
A neighbour had her Yaris engine written off as the oil pump failed. I
believe some Toyota engines do not have the oil pump interlocked with the
crank shaft and taken off the timing belt. Is that so? Is the Yaris one of
these?
 
G

·
Discussion Starter · #2 ·
"L2007" <[email protected]> wrote in message
news:[email protected]
>A neighbour had her Yaris engine written off as the oil pump failed. I
>believe some Toyota engines do not have the oil pump interlocked with the
>crank shaft and taken off the timing belt. Is that so? Is the Yaris one of
>these?
>


I am not sure what you mean by "interlocked with the crank shaft," but the
effect of an oil pump that is driven directly by the crank shaft and a pump
that is driven by the timing belt or chain is the same. If the engine is
moving, so is the oil pump.


--

Ray O
(correct punctuation to reply)
 
G

·
Discussion Starter · #3 ·
"Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
news:[email protected]
>
> "L2007" <[email protected]> wrote in
> message news:[email protected]
>>A neighbour had her Yaris engine written off as the oil pump failed. I
>>believe some Toyota engines do not have the oil pump interlocked with the
>>crank shaft and taken off the timing belt. Is that so? Is the Yaris one of
>>these?
>>

>
> I am not sure what you mean by "interlocked with the crank shaft," but the
> effect of an oil pump that is driven directly by the crank shaft and a
> pump that is driven by the timing belt or chain is the same. If the
> engine is moving, so is the oil pump.


So if the chain breaks no oil and no engine.
 
G

·
Discussion Starter · #4 ·
"L2007" <[email protected]> wrote in message
news:[email protected]
>
> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
> news:[email protected]
>>
>> "L2007" <[email protected]> wrote in
>> message news:[email protected]
>>>A neighbour had her Yaris engine written off as the oil pump failed. I
>>>believe some Toyota engines do not have the oil pump interlocked with the
>>>crank shaft and taken off the timing belt. Is that so? Is the Yaris one
>>>of these?
>>>

>>
>> I am not sure what you mean by "interlocked with the crank shaft," but
>> the effect of an oil pump that is driven directly by the crank shaft and
>> a pump that is driven by the timing belt or chain is the same. If the
>> engine is moving, so is the oil pump.

>
> So if the chain breaks no oil and no engine.


If the timing chain or belt breaks, the engine will not run. If the engine
is not running, neither the crank shaft or timing belt/chain will drive the
oil pump.

I am surprised that your neighbour's Yaris's oil pump failed because I
cannot recall ever hearing of a Toyota oil pump failing. Mechanical oil
pumps are very simple devices, and since they are moving oil, they are
always well-lubricated.


Ray O
(correct punctuation to reply)
 
G

·
Discussion Starter · #5 ·
"Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
news:[email protected]
>
> "L2007" <[email protected]> wrote in
> message news:[email protected]
>>
>> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
>> news:[email protected]
>>>
>>> "L2007" <[email protected]> wrote in
>>> message news:[email protected]
>>>>A neighbour had her Yaris engine written off as the oil pump failed. I
>>>>believe some Toyota engines do not have the oil pump interlocked with
>>>>the crank shaft and taken off the timing belt. Is that so? Is the Yaris
>>>>one of these?
>>>>
>>>
>>> I am not sure what you mean by "interlocked with the crank shaft," but
>>> the effect of an oil pump that is driven directly by the crank shaft and
>>> a pump that is driven by the timing belt or chain is the same. If the
>>> engine is moving, so is the oil pump.

>>
>> So if the chain breaks no oil and no engine.

>
> If the timing chain or belt breaks, the engine will not run. If the
> engine is not running, neither the crank shaft or timing belt/chain will
> drive the oil pump.


If the pump is off a belt and the belt snaps at say 70mph, In a car with
manual gear change the driver could drop down the gears using engine brake
to stop which means the engine is turning with no oil pump running, which
could mean serious problems. Not fail safe.

> I am surprised that your neighbour's Yaris's oil pump failed because I
> cannot recall ever hearing of a Toyota oil pump failing. Mechanical oil
> pumps are very simple devices, and since they are moving oil, they are
> always well-lubricated.


It is the first I have heard of. An oil pump failing is such a rare thing
on any car. I asked her if there was oil in it, she replied, yes. She was
on a fast A road doing around 65mph. The engine was written off, which
meant the car financially was. The rest of it is fine, so someone somewhere
will buy it cheap and drop in an engine, or recon the seized engine.
 
G

·
Discussion Starter · #6 ·
"L2007" <[email protected]> wrote in message
news:[email protected]
>
> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
> news:[email protected]
>>
>> "L2007" <[email protected]> wrote in
>> message news:[email protected]
>>>
>>> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
>>> news:[email protected]
>>>>
>>>> "L2007" <[email protected]> wrote in
>>>> message
>>>> news:[email protected]
>>>>>A neighbour had her Yaris engine written off as the oil pump failed. I
>>>>>believe some Toyota engines do not have the oil pump interlocked with
>>>>>the crank shaft and taken off the timing belt. Is that so? Is the Yaris
>>>>>one of these?
>>>>>
>>>>
>>>> I am not sure what you mean by "interlocked with the crank shaft," but
>>>> the effect of an oil pump that is driven directly by the crank shaft
>>>> and a pump that is driven by the timing belt or chain is the same. If
>>>> the engine is moving, so is the oil pump.
>>>
>>> So if the chain breaks no oil and no engine.

>>
>> If the timing chain or belt breaks, the engine will not run. If the
>> engine is not running, neither the crank shaft or timing belt/chain will
>> drive the oil pump.

>
> If the pump is off a belt and the belt snaps at say 70mph, In a car with
> manual gear change the driver could drop down the gears using engine brake
> to stop which means the engine is turning with no oil pump running, which
> could mean serious problems. Not fail safe.
>


Yes, this is a possibility if the engine is free-wheeling
(non-interference). If it is an interference engine and something snaps at
70 MPH, I would not count on engine braking.

The trend in newer Toyotas seems to be towards interference engines with
timing chains.

>> I am surprised that your neighbour's Yaris's oil pump failed because I
>> cannot recall ever hearing of a Toyota oil pump failing. Mechanical oil
>> pumps are very simple devices, and since they are moving oil, they are
>> always well-lubricated.

>
> It is the first I have heard of. An oil pump failing is such a rare thing
> on any car. I asked her if there was oil in it, she replied, yes. She was
> on a fast A road doing around 65mph. The engine was written off, which
> meant the car financially was. The rest of it is fine, so someone
> somewhere will buy it cheap and drop in an engine, or recon the seized
> engine.
>


One person's junk is another person's opportunity!

--

Ray O
(correct punctuation to reply)
 
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