CAT 12H Coolant issue

Any more on this? Didn't hear from Tony but thinking a leaky upper liner o ring may also be possible.
If the counterbore is passing exhaust gas it won't take much to get past the oring. And on intake stroke, no suction obviously to draw water back.
Would also account for spitting coolant out.
Metal spraying and re machining counterbores is a common repair on Cat engines as are all the gallery oring rebates on the deck face.

Have you done a leakdown on the cooling system yet?


Sent from my backyard TeePee using smoke signals.

I think he is waiting until he gets Bens results before taking it any further.
We basically want proof that the motor is due to fail as the machine has already been kept longer than it should have.
The CAT goes,I get a brand new machine and my Volvo becomes the maintence grader.
Andrew

It'l be a John Deere for you--:Rolling:

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Originally Posted by Pedro_The_Swift

It'l be a John Deere for you--:Rolling:

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A John Deere would be my first choice,had a demo day last year.My Volvo is good,the John Deere was better.It had better low down pulling power than Helga.Loved the hand controls,much easier on the back as your arms are at your sides,plus it has a small steering wheel too when you need to hang on.
More than happy to have another Volvo,great machine best service backup you can have.A neighboring shire has a CAT 12M,nobody likes operating it and when it breaks down they have service back up issues.
Andrew

Here you go Pedro.
They are the best selling grader in Australia at the moment.
Motor Graders from John Deere Construction Equipment
Andrew

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Originally Posted by LandyAndy

I think he is waiting until he gets Bens results before taking it any further.
We basically want proof that the motor is due to fail as the machine has already been kept longer than it should have.
The CAT goes,I get a brand new machine and my Volvo becomes the maintence grader.
Andrew

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Hope you (and Tony) got the results ok Andy?

Not good...

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Originally Posted by Blknight.aus

if it keeps on doing it that quickly its got oil contamination.

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Absolutely no oil, fuel (or carbon/soot) in the sample.

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Originally Posted by LOVEMYRANGIE

This would indicate possibly a porous block.

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I suspect you may be right - but it would need to be like a sponge for the levels found...

Tony called me last night. Most damage would occur when it's sat idle for extended periods not being used and coolant isn't being circulated. It has done 8000 hours over 8 years so it's idle period is fairly high considering there's 8760 hours in a year.
Suggested they get an endoscopic inspection done on the block to see how bad gallery walls are.

Andrew


I am not a moderator, I am a human being!!!

Hi Ben
Yes we got the results.
Thanks HEAPS for doing that.

Bens analysis indicates that the sludge that falls out of suspension is 57% Iron Oxide.No wonder the radiator is blocking up.CAT reccomend replacing the waterpump ASAP.Andrew are CAT waterpumps known to corrode badly????
Andrew

Quote:

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Originally Posted by LandyAndy

Hi Ben
Yes we got the results.
Thanks HEAPS for doing that.

Bens analysis indicates that the sludge that falls out of suspension is 57% Iron Oxide.No wonder the radiator is blocking up.CAT reccomend replacing the waterpump ASAP.Andrew are CAT waterpumps known to corrode badly????
Andrew

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Not really or at least no worse than any other cast iron component.
Not sure why they would suggest changing the pump though unless they know the impellers dissolved itself. Seems like a makeshift excuse that's starts with the pump and ends up with a new engine.....

As before, draining it and getting access to the galleries will be the only way to assess if anything else is going on inside.
It may well be serviceable with a citric acid soak and flush to descale and burn off any rust but you need to check the limit of corrosion around joints, seals and gaskets particularly around the deck/head seals otherwise it may eat a little too much hence and endoscope is required if your not going to pull heads etc.

Even pulling the gallery plugs along the side will let you peak inside it.

Andrew


I am not a moderator, I am a human being!!!

Quote:

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Originally Posted by LandyAndy

Hi Ben
Yes we got the results.
Thanks HEAPS for doing that.

Bens analysis indicates that the sludge that falls out of suspension is 57% Iron Oxide.No wonder the radiator is blocking up.CAT reccomend replacing the waterpump ASAP.Andrew are CAT waterpumps known to corrode badly????
Andrew

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Slight correction Andy - 57% Iron, so likely 99.99% Iron oxide.
The test only gives the amount of pure metal in the sample.