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Intake Manifold gasket or head gasket?

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Old Jan 1, 2025 | 12:35 AM
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Intake Manifold gasket or head gasket?

Getting coolant from my exhaust in a 92 F150 5.0 but that’s the only symptom I’m having. No bubbles in radiator no over heating no milky oil. I read somewhere the intake gaskets on these 302s have been known to go out and can mimic a blown head gasket. I did a combustion test and the liquid went from blue to a yellowish blue. Can anyone more knowledge about the combustion process and these 302s tell me if I could possibly only have an intake gasket issue and not a blown head gasket?
 
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Old Jan 1, 2025 | 01:20 AM
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Front intake coolant passages to head can leak into lifter valley.

On high mileage engines the area around port of manifold & head corrodes/pits.
 
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Old Jan 1, 2025 | 02:24 AM
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Originally Posted by Scndsin
Front intake coolant passages to head can leak into lifter valley.

On high mileage engines the area around port of manifold & head corrodes/pits.
I had a small puddle of coolant above the water pump sort of near the distributor. It kind of sounds like it could be the front intake gasket? And that would explain why I don’t have the other symptoms of a blown head yeah?
 
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Old Jan 1, 2025 | 08:31 AM
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It appears that the water pump/timing cover area on small blocks have seeped coolant from the upper studs & bolts across several manufacturing years.

Personally, I think this was either a tool fault or setting/spec error on the assembly line.

Usually described here on FTE by many folks as "truck looses coolant, stinks of coolant, no puddles under truck".

It fills in the area & cooks off the water leaving this area filled with gunk.

This is mine:



But this does not provide a direct path for coolant to make it into the oil.

I have a particular way that I seal this which works for me.
 
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Old Jan 1, 2025 | 12:34 PM
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From: Salkum
Curious on why you started a new thread on the same subject and questions (white exhaust smoke)as you did back on the 22nd?

At that time you stated that you did a combustion gas test and the color turned green and now it’s different?

Hopefully the moderators will delete this thread or merge it into your previous thread so people are not wasting their time to reply to a repeated subjunctive for you.
 
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Old Jan 1, 2025 | 01:01 PM
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Well, you can certainly do that. But I have never read the other thread much less considered responding to it.

He asked a specific question. I tried to respond accordingly.
 
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Old Jan 1, 2025 | 01:45 PM
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Originally Posted by HydroDog
Curious on why you started a new thread on the same subject and questions (white exhaust smoke)as you did back on the 22nd?

At that time you stated that you did a combustion gas test and the color turned green and now it’s different?

Hopefully the moderators will delete this thread or merge it into your previous thread so people are not wasting their time to reply to a repeated subjunctive for you.
well this thread is a little different because I’m asking about it possibly being an intake gasket blown instead of head. Sorry this bothered you so much if they want it gone then that’s fine.
 
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Old Jan 1, 2025 | 01:47 PM
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Originally Posted by Scndsin
Well, you can certainly do that. But I have never read the other thread much less considered responding to it.

He asked a specific question. I tried to respond accordingly.
the other thread was about the head gasket and this one is about the intake gasket so it is a little different but I guess it isn’t different enough.
 
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Old Jan 1, 2025 | 01:48 PM
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Originally Posted by Scndsin
It appears that the water pump/timing cover area on small blocks have seeped coolant from the upper studs & bolts across several manufacturing years.

Personally, I think this was either a tool fault or setting/spec error on the assembly line.

Usually described here on FTE by many folks as "truck looses coolant, stinks of coolant, no puddles under truck".

It fills in the area & cooks off the water leaving this area filled with gunk.

This is mine:



But this does not provide a direct path for coolant to make it into the oil.

I have a particular way that I seal this which works for me.
I wrote it off as the thermostat housing was leaking I’ll get a better look when I take the intake off.
 
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Old Jan 1, 2025 | 02:05 PM
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Exhaust coolant

What about the coolant passage in the throttle body? Has anyone had a leak there?
 
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Old Jan 1, 2025 | 02:31 PM
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Originally Posted by Scndsin
It fills in the area & cooks off the water leaving this area filled with gunk.

This is mine:

I had the same problem on the 302 but it only left a slight stain. I did eventually see a small puddle there.

Originally Posted by brandobronco
I wrote it off as the thermostat housing was leaking I’ll get a better look when I take the intake off.
Why are you removing the intake? Only the upper or both upper and lower?

Originally Posted by kenny nunez
What about the coolant passage in the throttle body? Has anyone had a leak there?
Only on a BBK throttle body. Never OEM.
 
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Old Jan 1, 2025 | 02:43 PM
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Originally Posted by My4Fordtrucks
Why are you removing the intake? Only the upper or both upper and lower?
From my first response I guess.

Originally Posted by Scndsin
Front intake coolant passages to head can leak into lifter valley.

On high mileage engines the area around port of manifold & head corrodes/pits.
I have seen the ECT pipe & t-stat leak & run down around distributor & if the O ring is compromised it can get in there too.
 
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Old Jan 1, 2025 | 02:47 PM
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Find the intake bolt:



 
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Old Jan 2, 2025 | 01:03 AM
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From: Salkum
Originally Posted by brandobronco
well this thread is a little different because I’m asking about it possibly being an intake gasket blown instead of head. Sorry this bothered you so much if they want it gone then that’s fine.
Your title in this thread is intake or head gasket but it still relates to your original problem that you feel that you are burning coolant(white smoke).

You are asking for diagnosis from the members and they are taking time out if there lives to help you out.
To turn around and ask virtually the same question without using the advice that you received before and then changing the the diagnostic facts and the remedies you have tried(head gasket sealer in a bottle) does not help the members help you. We end up repeating the same things to try.

And since this forum is a living document, there is going to be someone after you doing a search for problem similar or the same as you and it’s going to help them if it’s all in the same thread to find the end result.

As for bothering me, I have taken only time out of my life to help you. I don’t know you from a stranger walking down the street, but I was willing to help.
 
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Old Jan 2, 2025 | 02:09 AM
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Originally Posted by HydroDog
Your title in this thread is intake or head gasket but it still relates to your original problem that you feel that you are burning coolant(white smoke).

You are asking for diagnosis from the members and they are taking time out if there lives to help you out.
To turn around and ask virtually the same question without using the advice that you received before and then changing the the diagnostic facts and the remedies you have tried(head gasket sealer in a bottle) does not help the members help you. We end up repeating the same things to try.

And since this forum is a living document, there is going to be someone after you doing a search for problem similar or the same as you and it’s going to help them if it’s all in the same thread to find the end result.

As for bothering me, I have taken only time out of my life to help you. I don’t know you from a stranger walking down the street, but I was willing to help.
And I thank you! My question, to me, was different. Like I said sorry it bothered you I posted twice. Won’t happen again. I was asking a follow up question about whether the intake gasket can mimic these head gasket symptoms and my first post was a more general question about the exhaust smoke I was having. I’ll delete the other thread for the future users. Thanks for your help!
 
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