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Old 07-30-2007, 11:47 PM   #1
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Default What happens when cleaning the head goes horribly wrong

Some here may have read what happened to me when I tried the 'dip a vacuum hose in some water and feed it into the intake to clean the combustion chambers' trick a couple of weeks back.....

Well... the replacement of the engine is progressing well, and I will look to rebuild the old damaged motor at some point, but first - here's the damage that occurred.....

This is a straight conrod (cyl 4):
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This is a bent one (cyl 1)
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Messy huh???

This is the intake side - you can see how it cleaned things up, but also how the little bit of residual standing water in the head around the valves is causing some surface rust:

cyl 4 -
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and cyl 1 -
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However, every dark cloud has a silver (polished?) lining. Replacing the motor gives me an opportunity to finish the job of making it all look good.....

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More pics will follow as I progress (including the full tear down of the old engine.....
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Old 07-30-2007, 11:53 PM   #2
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ouch man. Was the car running at idle speeds when that happened? Sux dood.
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Old 07-31-2007, 12:40 AM   #3
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Yah it doesn't take much water to send cylinder pressures to conrod bending levels.

I'd recommend using seafoam for this trick (sucking in cleaner through vacuum hose) in the future.

New engine looks nice.
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Old 07-31-2007, 07:01 PM   #4
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Water does not compress as readily as sayyyyyy air. Well, it will but it takes astronomical amounts of pressure to compress it.
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Old 07-31-2007, 08:49 PM   #5
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for anyone that wants to use water instead of seafoam i recommend getting the mazda recommended orifice (in their TSB on Top engine cleaning), they cost about $2 and will prevent the water being sucked down too fast.
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Old 08-01-2007, 02:07 AM   #6
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Wow, I thought it would be pretty hard to hydrolock through a vacuum line. How long was the line submerged?
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Old 08-01-2007, 03:09 AM   #7
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Quote:
Originally Posted by ApexOnYou View Post
Wow, I thought it would be pretty hard to hydrolock through a vacuum line. How long was the line submerged?
About 3-5 seconds, if that.

I know about the laws of physics - I did when I tried this trick too.....

If you do a look through the Greddy thread for a post on 'taking the head off', you'll see how this all got so out of shape, and how a little bit iof mis-(missing) information can do lots of damage.

Mazda specialised part of not - I'm not keen on the thought of doing this myself ever again. My Mazda workshop can do it, and when/if they get it wrong, they can do the bloody rebuild instead of me.....
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