D330 C pushing water

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ms0115

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CAT D330 C
Serial - 4B1888

Total rebuilt 420 hours ago. Motor started getting warm and pushing antifreeze out the overflow. (8lb cap). Will only do it at wide open throttle, but will push a full stream out of the overflow tube. Pulled the head and had the surface checked and lightly resurfaced because it had just been resurfaced at the initial rebuild. Resealed all pre combustion chambers, used cat gaskets and o rings. The head was magnifluxed, no cracks found; I see nothing wrong with the liners. Any ideas?
Thanks,
Michael

[email protected]

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Fri, Apr 28, 2017 12:35 AM

Old Magnet

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Is it producing bubbles at the radiator neck when cap is removed?
Brings up the concern about proper liner projection.
What's the status of the radiator core?

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Fri, Apr 28, 2017 1:17 AM

ms0115

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Reply to Old Magnet:

Is it producing bubbles at the radiator neck when cap is removed?
Brings up the concern about proper liner projection.
What's the status of the radiator core?

[quote="Old Magnet"]Is it producing bubbles at the radiator neck when cap is removed?
Brings up the concern about proper liner projection.
What's the status of the radiator core?[/quote]

The radiator was sent to the shop and recored. There are no bubbles at idle , but as the rpm comes up it pushes water out of the spout (the water rises,but there are no bubbles). The new liners are the same thickness as the old ones. Is it possible for the pre combustion chambers not to seal and cause this kind of problem. No cylinders appear to be washed down, they are still carboned on the pistons and valves. The oil is staying black, but I am getting some water out of the crank case ventilation.

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Fri, Apr 28, 2017 2:43 AM

rmyram

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maybe your water pump is sucking air in the shaft seal and it builds up and pushes the water out. if it were a liner or precom, engine speed should not affect the air ingression. the faster the engine runs, the more negative pressure at the centre of the water pump impeller, may be enough to draw in air if the seal is dodgy.

just a thought from out side the conventional box.

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Fri, Apr 28, 2017 3:20 AM

ms0115

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Reply to rmyram:

maybe your water pump is sucking air in the shaft seal and it builds up and pushes the water out. if it were a liner or precom, engine speed should not affect the air ingression. the faster the engine runs, the more negative pressure at the centre of the water pump impeller, may be enough to draw in air if the seal is dodgy.

just a thought from out side the conventional box.

[quote="rmyram"]maybe your water pump is sucking air in the shaft seal and it builds up and pushes the water out. if it were a liner or precom, engine speed should not affect the air ingression. the faster the engine runs, the more negative pressure at the centre of the water pump impeller, may be enough to draw in air if the seal is dodgy.

just a thought from out side the conventional box.[/quote]

I will check it out, but we just had it rebuilt. Thanks for the help.

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Fri, Apr 28, 2017 3:26 AM

Old Magnet

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Reply to ms0115:

[quote="rmyram"]maybe your water pump is sucking air in the shaft seal and it builds up and pushes the water out. if it were a liner or precom, engine speed should not affect the air ingression. the faster the engine runs, the more negative pressure at the centre of the water pump impeller, may be enough to draw in air if the seal is dodgy.

just a thought from out side the conventional box.[/quote]

I will check it out, but we just had it rebuilt. Thanks for the help.

Whether you had compression leak or air drawn into the cooling system it would still vent at the filler neck. Have you checked thermostat function?
Do you know what the actual liner projection readings are?
Did the condition change after rebuilding the water pump?

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Fri, Apr 28, 2017 3:39 AM

catsilver

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Reply to Old Magnet:

Whether you had compression leak or air drawn into the cooling system it would still vent at the filler neck. Have you checked thermostat function?
Do you know what the actual liner projection readings are?
Did the condition change after rebuilding the water pump?

I'm not absolutely sure but I think it should have a 13lb pressure cap, if its not pushing air out of the radiator, I would be looking for a restriction in the radiator or transmission cooler, just a thought, take a look at what is happening to the bottom radiator hose when you open the throttle right out.

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Fri, Apr 28, 2017 3:54 AM

Old Magnet

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Reply to catsilver:

I'm not absolutely sure but I think it should have a 13lb pressure cap, if its not pushing air out of the radiator, I would be looking for a restriction in the radiator or transmission cooler, just a thought, take a look at what is happening to the bottom radiator hose when you open the throttle right out.

My parts book shows a 6L8617 (7#) radiator cap.

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Fri, Apr 28, 2017 4:36 AM

ms0115

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Reply to catsilver:

I'm not absolutely sure but I think it should have a 13lb pressure cap, if its not pushing air out of the radiator, I would be looking for a restriction in the radiator or transmission cooler, just a thought, take a look at what is happening to the bottom radiator hose when you open the throttle right out.

I will check these items, thanks.

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Fri, Apr 28, 2017 4:39 AM

ms0115

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Reply to Old Magnet:

Whether you had compression leak or air drawn into the cooling system it would still vent at the filler neck. Have you checked thermostat function?
Do you know what the actual liner projection readings are?
Did the condition change after rebuilding the water pump?

[quote="Old Magnet"]Whether you had compression leak or air drawn into the cooling system it would still vent at the filler neck. Have you checked thermostat function?
Do you know what the actual liner projection readings are?
Did the condition change after rebuilding the water pump?[/quote]
I do not know the height. I miked the tops of the liners and they were the same, so I reinstalled.
I installed a new thermostat and seals. When it started running hot again, I changed with another CAT thermostat.
It ran about 400 hours before it began running hot since the rebuilt.

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Fri, Apr 28, 2017 4:45 AM

ms0115

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[quote="ms0115"]CAT D330 C
Serial - 4B1888

Total rebuilt 420 hours ago. Motor started getting warm and pushing antifreeze out the overflow. (8lb cap). Will only do it at wide open throttle, but will push a full stream out of the overflow tube. Pulled the head and had the surface checked and lightly resurfaced because it had just been resurfaced at the initial rebuild. Resealed all pre combustion chambers, used cat gaskets and o rings. The head was magnifluxed, no cracks found; I see nothing wrong with the liners. Any ideas?
Thanks,
Michael

[email protected][/quote]

Waterpump impeller was spinning on the shaft. Will test run tomorrow and give an update. Thanks for all the help.

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Fri, Apr 28, 2017 6:46 AM

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