S2000 Under The Hood S2000 Technical and Mechanical discussions.

oil in the radiator

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Old Oct 31, 2006 | 06:48 AM
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Default oil in the radiator

collant hose is crushed and theres oil in the radiator and the collant overflow....this happend once before back in april and supposedly honda fixed it but didnt obviously so ima go bitch them out and see wtf is wrong..

but what yall think this is...cause it happened only 6 months ago or so and now its happened again
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Old Oct 31, 2006 | 06:56 AM
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oil in the coolant and or coolant in the oil is a sign of a leaky head gasket. Could be something else but most of the time it comes down to that.
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Old Oct 31, 2006 | 06:59 AM
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It appears that you have a leaking head gasket. The dealer will have to remove your head and replace the head gasket.
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Old Oct 31, 2006 | 04:25 PM
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**** now its starting to overheat
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Old Oct 31, 2006 | 05:59 PM
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Originally Posted by dupmaronew,Oct 31 2006, 08:25 PM
**** now its starting to overheat
oily coolant does not cool well, that is typical. You get what most people refer to as a milkshake. The water pump sucks in oil and it starts to foam. Then you lose a lot of heat transfer due to foaminess. Also you need to be aware that if you have oil in your coolant it is likely you have coolant in your oil as well. Water laden oil does lubricate well either. You really shouldn't be driving the car in this state....
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Old Oct 31, 2006 | 06:25 PM
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Originally Posted by dupmaronew,Oct 31 2006, 08:25 PM
**** now its starting to overheat
Yep. That's what happens when you have a small leak in your head gasket:

As you drive the car, the high pressure of the cylinder firing forces some combustion gases and a little oil into the cooling system.

When you turn off the engine, some of the pressurized coolant leaks into the cylinder. But because the head gasket has a leak, the cooling system sucks vapors from the leaking cylinder rather than pull coolant from the reservoir as the engine cools down. Because of this, the radiator doesn't fill back up with coolant even though there may be extra coolant in the reservoir.

When you start the cold engine back up, you will get a misfire for a few seconds from the leaking cylinder due to the coolant in the cylinder. Once the coolant is gone, the cylinder will start firing again, and it will appear to run well. But because the radiator didn't fill back up when the engine was cold, there isn't enough coolant in the radiator to prevent your engine from overheating.

You need to get your head gasket replaced immediately. you run the risk of hydrolocking your cylinder. And make sure you change your oil right away as well. You will have lots of coolant and water in your oil.

BTW: You will also probably notice your A/C doesn't work well either. That's because the low coolant in your radiator will make the air coming through the radiator very hot, therefore significantly reducing the efficiency of your air conditioner.
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Old Oct 31, 2006 | 06:39 PM
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Crap man...yeah, that's typical of a blown HG. Replace it yesterday. GL! That stinks...
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Old Oct 31, 2006 | 07:31 PM
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Oil in the radiator can also be a sign of the oil cooler has an internal leak. The engines oil pressure is much higher than the cooling system pressure. Oil will enter the cooling system, but coolant won't make it to the crankcase.

Which coolant hose is sucked in?

You may still have a head gasket issue, but a leakdown test needs to be performed before tearing down the engine.
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Old Oct 31, 2006 | 07:46 PM
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make sure your oil is there and not green or light brown!
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Old Oct 31, 2006 | 11:30 PM
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so basically hey honda dealer fix my shit
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