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1999 Chevrolet Tahoe tapping very loud

Tiny
TOLLEY81
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 200,000 MILES
I used liquid glass to repair a leak where water was getting in my oil, after fixing the leak I changed my oil. Drove home (28 miles) with no problem. Never ran hot or made a sound. Today I started my truck and it was tapping very loud and my oil was milky again but my cooling system is still full of water ( no antifreeze was used). Oil pressure is between 20 and 40 psi like normal. What's wrong and how can I fix this? Please help, Ican drive my truck to work or anywhere
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Sunday, May 17th, 2015 AT 9:25 PM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You can fix it by taking the engine apart and actually repairing whatever is wrong with it. There is no such thing as "Mechanic in a Can"
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Monday, May 18th, 2015 AT 2:04 AM
Tiny
TOLLEY81
  • MEMBER
  • 6 POSTS
I know that. The liquid glass was a temporary fix til this Friday when I get paid again. I'm going to drain all oil, replace oil filter, drain and flush the cooling system, replace head gaskets and clean the inside of valve covers, lifters and spark plugs. Before I put new oil in and refill cooling system is there anything that the liquid glass may have damaged that I need to replace first? I have no problem paying you this Friday when I get my pay check if you could please just give me fair and honest reply. I work 7 days a week and I need transportation. Do you think I can fix this engine fairly cheap or should I just replace the engine. I should have never listened to the autozone employee that suggested liquid glass as a temporary solution.
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Monday, May 18th, 2015 AT 2:23 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
It's hard to say. That type of stuff is notorious for plugging up radiators and heater cores but you won't know until you get the engine repaired and running. How do you know the head gasket is the problem? Did the truck previously overheat badly? Are you sure the problem isn't the intake manifold gasket? That's a distinct possibility if the engine wasn't overheated. Far more common than head gaskets. If you do pull the heads you have to send them out to a machine shop to be tested and resurfaced at minimum.
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Monday, May 18th, 2015 AT 2:44 AM
Tiny
TOLLEY81
  • MEMBER
  • 6 POSTS
Ok thank you sir. I will find the problem and fix it or I will just have the engine rebuilt. And thinking about it I think Ur right on it being the intake manifold gasket because there is still water in the oil after the liquid glass and what bothers me the most is my engine never made a sound and it near ran hot before the liquid glass but now is tapping so loud it sounds like 100 tap dancers on metal. Its not a rod knocking the tapping is all coming from the top of engine almost like its not getting oil to lifters or push rods but it is. I'm gonna disconnect my heater core and take thermostat out also just in case the L. Glass stopped that up too. Again thanks
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Monday, May 18th, 2015 AT 3:15 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
NO, NO, NO. You can't remove the thermostat. That will effect all kinds of things in the computer.
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Monday, May 18th, 2015 AT 3:47 AM
Tiny
TOLLEY81
  • MEMBER
  • 6 POSTS
I meant replace the thermostat not just take it out.
Sorry I'm half asleep still
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Monday, May 18th, 2015 AT 3:51 AM

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