I've got a 6nz problem.

Robnozz · May 3, 2009

DDS said: ↑

You do not have to have coolant in the cylinder to have the headgasket failed. The head has a relief cut bettween the cylinders, if the gasket fails the compression can go up in the the relief, lowering the compression of that cylinder. I have had engines ran with a failed gasket for three months before it failed to the point of coolant entry. Did you try using a rubber tip air blower and applying shop air to the cylinders with all the injectors out? The last one I did I put pressure to number four and air came up out of cylinder five, The gasket ahad failed between four and five in the relief area.

And yes a broken injector spring can cause white smoke but how did the tech know that the cylinders were wet with diesel? When you remove the injecotors, even with the fuel rail blowen out, you always get a bit of fuel in the cylinders.
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As far as I know he did not try putting air to the cylinders. Its still apart so Ill let him know to do it.

He explained to me that the amount of fuel in the cylinders was more than usual.

Thanks for the response DDS.

05chopper · May 3, 2009

Pull the exhaust manifold off look for traces of coolant out of each port.The cylinder head needs to be checked for cracks this is done in a hot tank with air pressure.

Robnozz · May 3, 2009

05chopper said: ↑

Pull the exhaust manifold off look for traces of coolant out of each port.The cylinder head needs to be checked for cracks this is done in a hot tank with air pressure.
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Thanks chopper

He will be pulling it off to replace the exhaust gaskets tomorrow. Will check for any signs of coolant. All the coolant I use has to be going somewhere.

05chopper · May 3, 2009

When you had all the injectors out did you pressure up the coolant and bore scope each cylinder looking for water near the valve pockets? If no water in the oil or on the ground then my bet your burning it out the exhaust which means you have to pull the cylinder head to pressure check for cracks in a hot tank with the valves removed.

05chopper · May 3, 2009

If the head is crack free check the liners for small pin holes. Liners are also pressure checked when out

Robnozz · May 3, 2009

Yes he checked all the cylinders with a scope, water pressure was over 10 pounds, and was sitting like that for 5 or six hours. No coolant was in the cylinders. I don't know about the valve pockets, but will ask him and see.

DDS · May 3, 2009

If you are pulling the exhaust, I would leave it off and plug the turbo oil suppy. Then install the injectors and Top end. That way you can start the engine cold to see what cylinder is wet,
If any after the broken injector is replaced

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