What is this 10mm bolt on front of engine block?

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Old 13 Aug 2005, 12:47 am   #1 (permalink)
g00g1eme@gmail.com
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Default What is this 10mm bolt on front of engine block?

I'm wanting to change the coolant on my 1997 Camry with the 5S-FE
engine. The owner's manual says there is a drain plug on the BACK of
the engine block. I was having a look under the hood today and noticed
a 10mm bolt on the FRONT of the engine block, just under and to the
right of the exhaust manifold. Is this a coolant drain plug? I thought
I would ask here first before undoing it in case it was oil and not
coolant that came gushing out!

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Old 13 Aug 2005, 11:13 am   #2 (permalink)
Daniel
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Default Re: What is this 10mm bolt on front of engine block?

That would not be the coolant drain.
Engine tilts back slightly, so the drain is in back.
That's the second drain plug for the block though. In my experience, I
would not bother opening that drain on the block.
Last time I tried this, after draining the radiator, I had to lift the
car and place jack stands, then use an extension and universal joint
due to limited awkward access, then only a few drops of coolant came
out. Plus, the drain plug on the block has no replaceable gasket, only
a plug with tapered threads.
I guess you could say it was fun doing it once, but once was enough.
I did discover, that with a light, you can see the drain valve at the
bottom of the radiator, if you look carefully from above.
In the past, I had removed the plastic shrouding under the radiator to
access the drain plug from below, but it is much simpler and quicker to
do this from above.

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Old 13 Aug 2005, 11:20 am   #3 (permalink)
Rob
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Default Re: What is this 10mm bolt on front of engine block?

It may be another drain for coolant actually it is kinda high up on the
engine so maybe it needs to be removed when refilling to purge air from
the system. I checked my 97 Haynes manual and it does not mention it
but that manual is pretty bad.

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Old 15 Aug 2005, 03:01 am   #4 (permalink)
Johnnyboy
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Default Re: What is this 10mm bolt on front of engine block?

The drain plug at the rear of the block from memory is 18mm. Not really easy
to remove or replace but is can be done from above.
You may drop it a couple of time when removing or replacing it.
John
"Rob" <robmurr@aol.com> wrote in message
news:1123950041.108044.263840@g47g2000cwa.googlegr oups.com...
> It may be another drain for coolant actually it is kinda high up on the
> engine so maybe it needs to be removed when refilling to purge air from
> the system. I checked my 97 Haynes manual and it does not mention it
> but that manual is pretty bad.
>



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Old 16 Aug 2005, 09:38 pm   #5 (permalink)
MUADIBŪ
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Default Re: What is this 10mm bolt on front of engine block?

>It may be another drain for coolant actually it is kinda high up on the
>engine so maybe it needs to be removed when refilling to purge air from
>the system. I checked my 97 Haynes manual and it does not mention it
>but that manual is pretty bad.


BINGO! It's the "burp" valve. Whilst Filling the engine with fresh
coolant, loosen it to allow air out of the block, and coolant to get
into places it otherwise will not go until the block is too hot and
burps all the water out of the filler opening while trying to get rid
of the air pockets in the block....................The bubbles just
seem to keep coming out of the block no matter how many times the
thing burps up through the filler.............if you fill it with that
purge plug open, (engine cool) then there will be less of a problem
with losing coolant/water.




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