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Old 02-29-2012, 03:52 PM
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COOLANT IN THE OIL 5.3 motor

Hey guys, im working on a 00 silverado 5.3 motor thats using coolant too fast. I change the oil in it two days ago and it had water or coolant in the oil !! The truck never ran hot as long as I had it. IM HOPING ITS NOT A BLOWN HEAD

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Old 02-29-2012, 04:17 PM
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Better get it fixed

I ran my Escort that way and lost the engine eventually it was a cracked head on mine, White fluff in the oil was antifreeze and water
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Old 02-29-2012, 04:39 PM
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Look it over well. Most likely is a intake gaskets puking out.Pretty common on those.
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Old 02-29-2012, 04:53 PM
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X2 on the intake. I have take them apart and the engine was full of milk shake right up to the intake runners.
If you keep running it you will destroy the bearings
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Old 02-29-2012, 06:28 PM
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Quote:
Originally Posted by latech
Look it over well. Most likely is a intake gaskets puking out.Pretty common on those.
There is no coolant passages in the intake of the 5.3 vortecs(LQ4). Check the head gaskets and the heads very close. I've replaced a few gaskets for coolant loss without any overheats.

Good Luck
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Old 02-29-2012, 07:00 PM
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Only place coolant is slippery is the floor..

WHEN you pull the heads. Have them checked for warp/flat. AND have them pressure checked.

I get a lot of these that are cracked along the upper row of head bolts. Topside, where the casting is machined for the head of the bolt. HARD to find with naked eye. But, bubbles like crazy with p-check..
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Old 03-01-2012, 05:24 PM
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Quote:
Originally Posted by ethn_bert
There is no coolant passages in the intake of the 5.3 vortecs(LQ4). Check the head gaskets and the heads very close. I've replaced a few gaskets for coolant loss without any overheats.

Good Luck
My bad, you are correct.
Fact is the Gen III doesnt even look like a chevrolet.
The LQ4 would be the RPO for the 6.0 litre also.
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Old 03-01-2012, 05:44 PM
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Quote:
Originally Posted by CHEVY94-00
Hey guys, im working on a 00 silverado 5.3 motor thats using coolant too fast. I change the oil in it two days ago and it had water or coolant in the oil !! The truck never ran hot as long as I had it. IM HOPING ITS NOT A BLOWN HEAD
check intake manifold its a common gm screw job on those motors
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Old 03-01-2012, 05:55 PM
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Quote:
Originally Posted by latech
My bad, you are correct.
Fact is the Gen III doesnt even look like a chevrolet.
The LQ4 would be the RPO for the 6.0 litre also.
Yep...should have said LM4 or one of the 6 others. I only remember LQ4 because that is what my Father in law has and im always working on it.

Either way he needs to look at the head gaskets and/or heads for the coolant leak.
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Old 03-01-2012, 06:01 PM
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Quote:
Originally Posted by ethn_bert
Yep...should have said LM4 or one of the 6 others. I only remember LQ4 because that is what my Father in law has and im always working on it.

Either way he needs to look at the head gaskets and/or heads for the coolant leak.
I agree. After checking the differences in the sbc i see what you are talking about. You are correct.
I work on so many different cars that I really dont even pay much attention to them. Only when I am assembling one, after that its 5:00 somewhere...LOL.

Its getting to be there are as many different SBCs as there are carmakers.
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Old 03-04-2012, 11:16 AM
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GM head gaskets

I see I wasn't the only one to experience those wonderful engineers designs, but I had 150 K on mine when it started to do the same, It was less money to buy a 2002 running take out with low mileage.
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Old 03-07-2012, 07:31 AM
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There were some early GenIII heads that leaked coolant near the front and rear drain backs. The water jacket wall got a little thin and had porosity issues. What casting number are the heads? The last 3 digits of the casting number should be visible above the exhaust flange. It's cast in, not stamped or etched. should be could be 706 or 753, or something like that. Either way, it's time to pull the motor. If you have that much white stuff, it's likely you have some damage to the bearings. It's good insurance to pull it apart and check before the crank gets chewed up. Good news is that 5.3's are pretty darn cheap in the boneyard. I picked a good one up with a bad lifter for $200. Guy thought it had a spun bearing, but the journals are great.
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Old 03-08-2012, 10:31 PM
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Yea I thought it would be that the heads were cracked too because the new style LS motor don't have water going through the intake. I pressure test it and it didn't leak down so ima do a head job and hope I can save my baby THANKS GUY
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Old 03-09-2012, 12:14 AM
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The truck never ran hot as long as I had it.
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