What is going on?? - Team Camaro Tech
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post #1 of 17 (permalink) Old Sep 27th, 16, 01:51 PM Thread Starter
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What is going on??

On my epic quest hunting for the elusive coolant leak, I came across a small puddle of coolant in a pocket between the head and the intake. Please don't give me bad news.
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post #2 of 17 (permalink) Old Sep 27th, 16, 02:08 PM
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Re: What is going on??

GOOD NEWS:
You could attempt to torque the intake bolts and see if that seals it up. Start in the center and go in an x pattern working in a circle and work your way out to ends. Torque to 30 FT LBS, in increments starting at 10 FT LBS, 20 FT LBS and then 30 FT LBS. Let it sit for about 5 minutes if you get any rotation at any torque levels to allow gasket compression and go over the pattern 1 more time.

BAD NEWS:
Is the intake cracked where the plug was put in? I am going to say its most likely an intake gasket leak. They happen because of the expansion rates of cast iron vs aluminum are different and it can loose a seal over time. You need a very, very, very thin skin of silicone around the water ports on the head and intake sides of the gasket to prevent leaks.

I use ultra black, put a bead around the water jacket port. Spread it thin with your finger and do the same on the intake. I also use aviation which is a non drying gasket holding material around the intake ports on the head and manifold to seal those up.

"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......
Then, you have enough horsepower."
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post #3 of 17 (permalink) Old Sep 27th, 16, 02:14 PM Thread Starter
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Re: What is going on??

Quote:
Originally Posted by Joe Harrison View Post
GOOD NEWS:
You could attempt to torque the intake bolts and see if that seals it up. Start in the center and go in an x pattern working in a circle and work your way out to ends. Torque to 30 FT LBS, in increments starting at 10 FT LBS, 20 FT LBS and then 30 FT LBS. Let it sit for about 5 minutes if you get any rotation at any torque levels to allow gasket compression and go over the pattern 1 more time.

BAD NEWS:
Is the intake cracked where the plug was put in? I am going to say its most likely an intake gasket leak. They happen because of the expansion rates of cast iron vs aluminum are different and it can loose a seal over time. You need a very, very, very thin skin of silicone around the water ports on the head and intake sides of the gasket to prevent leaks.

I use ultra black, put a bead around the water jacket port. Spread it thin with your finger and do the same on the intake. I also use aviation which is a non drying gasket holding material around the intake ports on the head and manifold to seal those up.
Whew, ok. Thanks Joe. This doesn't sound that bad. Now, I just have to find that coolant leak at the radiator.
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post #4 of 17 (permalink) Old Sep 27th, 16, 03:38 PM
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Re: What is going on??

Yes, could be as easy as coolant getting past the gasket and/or intake bolt threads.

Did you use any sealant on the bolt threads ?

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post #5 of 17 (permalink) Old Sep 27th, 16, 04:30 PM
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Re: What is going on??

Quote:
Originally Posted by blackmagik3 View Post
Whew, ok. Thanks Joe. This doesn't sound that bad. Now, I just have to find that coolant leak at the radiator.
Use this dye with a black light to pin point the leak source.

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post #6 of 17 (permalink) Old Sep 27th, 16, 05:11 PM
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Re: What is going on??

Doesn't the second bolt go into the coolant area in head?

Don
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post #7 of 17 (permalink) Old Sep 27th, 16, 05:29 PM Thread Starter
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Re: What is going on??

Quote:
Originally Posted by zdld17 View Post
Doesn't the second bolt go into the coolant area in head?
I'm not entirely sure as I bought this crate motor pre-assembled. I'm learning as I go.
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post #8 of 17 (permalink) Old Sep 27th, 16, 05:46 PM
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Re: What is going on??

Quote:
Originally Posted by blackmagik3 View Post
I'm not entirely sure as I bought this crate motor pre-assembled. I'm learning as I go.
I bet is does, as the coolant passage is in the middle of those bolts . The front bolt is a blind hole the next bolt is into the coolant. I have had many bolts rust off. Some one mentioned this, you could drain the radiator to about half or lower , then pull that bolt and apply rtv in the hole and bolt, put it back together. refill and test.
Worse thing that can happen is have to take the intake off and put a new set of gasket. Easy. Let see what the others say but I believe I am right.

Don
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post #9 of 17 (permalink) Old Sep 27th, 16, 08:22 PM
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Re: What is going on??

I've used this GM thread sealant when threading into water jacket with good results.
https://www.amazon.com/Genuine-Fluid.../dp/B000QIXFEE
As Don said drain the coolant level below the area you're trying to seal first.
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post #10 of 17 (permalink) Old Sep 27th, 16, 08:35 PM
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Re: What is going on??

Quote:
Originally Posted by zdld17 View Post
Doesn't the second bolt go into the coolant area in head?
No. The end holes are blind. All the rest are open to the valley below. They should still be sealed to prevent oil from migrating up. Any coolant is seeping past the gasket, not migrating up the threads of the intake bolts.

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post #11 of 17 (permalink) Old Sep 27th, 16, 08:54 PM
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Re: What is going on??

Carl,
I know this is off topic, but from the photo you posted I see you have a rubber fuel line clamped to the fuel lines to your carb from the high pressure side of the pump. It wouldn't be good if this popped off or the line deteriorated causing a leak or spraying fuel on your hot manifolds/headers. For safety sake you might consider either braided lines with the proper AN fittings or a hard line from the pump like the OEM setup. Just hate for you to have a fire.
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post #12 of 17 (permalink) Old Sep 28th, 16, 06:59 AM
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Re: What is going on??

Quote:
Originally Posted by bilodeaulynn View Post
No. The end holes are blind. All the rest are open to the valley below. They should still be sealed to prevent oil from migrating up. Any coolant is seeping past the gasket, not migrating up the threads of the intake bolts.
Yes end holes are blind, so you ar saying there is no threads open to coolant? If thats the case , then his gasket is gone and coolant is migrating up via bolt threads.

I recall having to helicoil the inner bolt hole next to coolant passage, due to corrosion in the thread.

Don
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post #13 of 17 (permalink) Old Sep 28th, 16, 12:04 PM Thread Starter
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Re: What is going on??

Quote:
Originally Posted by ctcz28 View Post
Carl,
I know this is off topic, but from the photo you posted I see you have a rubber fuel line clamped to the fuel lines to your carb from the high pressure side of the pump. It wouldn't be good if this popped off or the line deteriorated causing a leak or spraying fuel on your hot manifolds/headers. For safety sake you might consider either braided lines with the proper AN fittings or a hard line from the pump like the OEM setup. Just hate for you to have a fire.
That's great advice. I'll look around for some braided fuel line this weekend.
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post #14 of 17 (permalink) Old Sep 28th, 16, 04:04 PM
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Re: What is going on??

Quote:
Originally Posted by zdld17 View Post
Yes end holes are blind, so you ar saying there is no threads open to coolant? If thats the case , then his gasket is gone and coolant is migrating up via bolt threads.

I recall having to helicoil the inner bolt hole next to coolant passage, due to corrosion in the thread.
Coolant is migrating past the gasket. If (AND THAT IS A BIG IF) it is migrating by any threads, then it is migrating down. Enough, and it will get a small amount of coolant in the oil.

Also, if coolant migrated into threads on the intake side of the head, it had to migrate past the gasket, then down the threads. And yes, that can happen.

Look at this head. The two end holes are blind (i.e. you can poke a wire in there and it will bottom out). The other four are open to the valley. While you CAN end up with coolant on threads, it only happens if there is a gasket failure.
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post #15 of 17 (permalink) Old Sep 29th, 16, 01:53 PM
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Re: What is going on??

Aviation on the bolt threads to the holes that open to the intake will seal them and not allow oil to migrate up the threads and under the bolt heads then onto the intake.

If you do not have one a rental torque wrench should be available at most auto parts stores.

"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......
Then, you have enough horsepower."
-Mark Donahue
My 67 Camaro Time Line
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