1999 GMC Safari Burst Engine Oil

Tiny
SUPLINCA
  • MEMBER
  • 1999 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
I changed the radiator and took off the thermostat because i had overheating problems then I went do a road test and suddenly the temperature needdle went up and I loose the engine power, I turned it off quicly and when I lift the hood and it was oil all over. I want to know what can happend beause I can't see where the oil burst is coming from, Please Help!!


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Sunday, November 22nd, 2009 AT 12:36 PM

9 Replies

Tiny
IMPALASS
  • EXPERT
Hello -

To better assist you please tell me your engine size in liter and if you have a rear wheel drive.

From what you are currently saying you may have blown an oil line going into the radiator. Have you checked those connections?
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Sunday, November 22nd, 2009 AT 5:05 PM
Tiny
SUPLINCA
  • MEMBER
My van is 4.3L V6 Vortek
The radiator has no problem at all everything is well connected. What I'm traying to say is the engine has a big leak I don't know from where. I added today a whole gallon of oil I turned it on just about 30 seconds and spill it almost completly. I couldn't even see from where in the demage everything is oil all over front top to bottom. Oil Pump? Timming Chain Cover?
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Monday, November 23rd, 2009 AT 12:27 AM
Tiny
IMPALASS
  • EXPERT
Hello -

Thanks for the info.

Well, as you say, you can't see because there is so much oil I too am unable to assist since I can not see.

However, this is what I would do. I would completely wash the engine. Top and bottom. Get it as clean as possible so there is no "fresh" oil on it.

Next fill and then don't start the car but turn the key to where it turns over just for a second and then turn it off and look it over really good. Look at the bottom of the car on the ground and that may give you a starting point of where to look up.

Then with a strong light look the top over really good and work your way down the sides to the bottom.

If no leak found then let the engine turn over a little more then shut off again. The whole point is to only have a little oil running out to narrow down where it is coming from.

As you said, it could be coming from anywhere. The front cover, valve covers, oil sending unit and so forth. It would be impossible for me to tell you without looking since there are many possibilities.

Remember the key is to just start the engine long enough to start the oil leak - not enough to spray oil everywhere.

I just had a vehicle in that blew an oil line.I did the same thing and once started there was a tear in the oil cooling line going to the radiator. But since I had oil all over the top of the engine I could not be sure until I cleaned, let dry and then do as I said above.

Let me know what you find.
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Monday, November 23rd, 2009 AT 4:00 PM
Tiny
SUPLINCA
  • MEMBER
Hi,

I did everything you advised me, I washed the engine and I found a hose oil cooling loose from radiator. I fixed it and now I have an overheating problem. Radiator an fan clutch is brand new and thermostat as well. What can be now the problem.
Thank you
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Monday, November 23rd, 2009 AT 6:08 PM
Tiny
IMPALASS
  • EXPERT
Hello -

Okay, that puts us back to the start of why you worked on it to start with if I am not mistaken.

You started having overheating problems so you changed the thermostat and radiator and fan clutch. Correct?

Then you started it and did the test drive and boom. The oil line.

Okay. If I am correct so far when was the last time you changed your water pump?

Are you sure all air is out of the system? Your top and bottom hoses are hot?

Do you have any heat inside the car when you turn your heater on high?

Does it overheat when driving or just when sitting idle and then cool down when driving?

You did a 50/50 mix of prestone?
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Monday, November 23rd, 2009 AT 8:21 PM
Tiny
SUPLINCA
  • MEMBER
Hi ImplaSS !

Thanks for helping me out this painfull issue!
Water pump never changed
Upper and Botton hose are hot
Radiator filled up full strength Orange Napa Fluid
Is overheating when I'm driving and needle goes up to 3/4 of gauge I think about 235 F. At idle stays
I don't use heater and make sure is not on either.

Have a good day! Thank you!
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Tuesday, November 24th, 2009 AT 12:02 PM
Tiny
IMPALASS
  • EXPERT
Hello -

Is okay to use heater as that will actually cool the engine down a little. So please check next time to see if you have good heat in the cab and don't be afraid to turn it on and leave it on to cool the engine.

Next since you have change your radiator, thermostat and fan clutch that only leaves the water pump. Is the shaft loose at all or is there any evidence of antifreeze leaking out of the bottom of the weep hole on the water pump?
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Tuesday, November 24th, 2009 AT 8:45 PM
Tiny
SUPLINCA
  • MEMBER
Hi !

I've checked all over no signs of any drip by or around the water pump. A friend told me the problem is already on gasket head blown up because the overheating. Is he right?

It is Ok to run the engine at that high temperature over 210 F

Thank You!
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Tuesday, November 24th, 2009 AT 9:40 PM
Tiny
IMPALASS
  • EXPERT
Hello

If it is running hot then no, I wouldn t run it. That can warp the heads and damage others things in the engine.

Besides running hot, do you have white smoke coming out the exhaust? Is it running rough? Are you loosing engine coolant?

Also, I believe Auto Zone carries a product similar to above.

With the number of miles you have on your vehicle.I would use the detector but I would also consider the water pump after the detector.
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Thursday, November 26th, 2009 AT 9:23 AM

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