Bad intake gasket?
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Freshman User
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Bad intake gasket?
So I have a 1989 crew cab dually 7.3 idi turbo with C6 auto, I noticed about a month ago a lip coooant missing so I filled it up and then today I noticed a oil bit more missing so I found coolant around the cap of the oil fill but none on the dipstick,then I removed air cleaner and found oil laying in the bottom of there. The truck is running the same, but I have noticed it doesn’t not smoke black hardly as much as it used to when I get on it. The radiator had no oil in it so I think that elimantes the head gasket, and the tranny fluid was fine so I think that eliminates a leaking cooler line. So all that’s left is just the intake manifold gasket right?Thanks in advance
Scope Wizard
Joined: May 2019
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IF you have water on the Oil Filler Cap then it ain't the Intake Manifold Gasket.....
there is several things it could be..... it could be the oil cooler.... it could be Head Gaskets or Head... or it could be the Block.
Do you test your coolant SCA ?
since you are loosing Coolant it would seem that it is not Condensation
there is several things it could be..... it could be the oil cooler.... it could be Head Gaskets or Head... or it could be the Block.
Do you test your coolant SCA ?
since you are loosing Coolant it would seem that it is not Condensation
Posting Guru
Joined: May 2015
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There's no coolant passages in our intake gaskets.
Most likely cause is oil cooler orings putting coolant in the oil which probably steams and ends up on the oil cap and passes through the cdr to end up in your intake. The intake is really flat so it's bad about pooling up in there.
Most likely cause is oil cooler orings putting coolant in the oil which probably steams and ends up on the oil cap and passes through the cdr to end up in your intake. The intake is really flat so it's bad about pooling up in there.
Scope Wizard
Joined: May 2019
Posts: 6,530
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There's no coolant passages in our intake gaskets.
Most likely cause is oil cooler orings putting coolant in the oil which probably steams and ends up on the oil cap and passes through the cdr to end up in your intake. The intake is really flat so it's bad about pooling up in there.
Most likely cause is oil cooler orings putting coolant in the oil which probably steams and ends up on the oil cap and passes through the cdr to end up in your intake. The intake is really flat so it's bad about pooling up in there.
another good test is run it 20 or so miles then in the morning pull the Glow Plugs and have a look see.....
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Freshman User
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There's no coolant passages in our intake gaskets.
Most likely cause is oil cooler orings putting coolant in the oil which probably steams and ends up on the oil cap and passes through the cdr to end up in your intake. The intake is really flat so it's bad about pooling up in there.
Most likely cause is oil cooler orings putting coolant in the oil which probably steams and ends up on the oil cap and passes through the cdr to end up in your intake. The intake is really flat so it's bad about pooling up in there.
Scope Wizard
Joined: May 2019
Posts: 6,530
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ok I assume this is the original engine.......... next in my first post to you was is Do you test the SCA ... Coolant test strips as these engines are prone to Block Failure if the coolant system is not maintained properly. this is what I generally mean 
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Freshman User
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Yes it is original engine and barely over 104,000miles, and no I do not usually test the coolant,I live in California where it doesn’t get very cold so I just always put 50/50
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Scope Wizard
Joined: May 2019
Posts: 6,530
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As was mentioned, check out your oil Cooler first..... and to understand more about SCA search Diesel engine Cavitation
I'll give a quick link for our 7.3 Diesels ..... Understanding Cavitation in the 7.3L IDI Diesel
back in the old daze we used to use Water Glass in our engines probably rare to find it today (sodium Silicate) but it was a stop gap method that worked back then.
I'm not trying to say that you have this issue, but only trying to make you aware that it does in fact exist and you can do things to prevent it.
I'll give a quick link for our 7.3 Diesels ..... Understanding Cavitation in the 7.3L IDI Diesel
back in the old daze we used to use Water Glass in our engines probably rare to find it today (sodium Silicate) but it was a stop gap method that worked back then.
I'm not trying to say that you have this issue, but only trying to make you aware that it does in fact exist and you can do things to prevent it.
Thread Starter
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Freshman User
Joined: Oct 2018
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As was mentioned, check out your oil Cooler first..... and to understand more about SCA search Diesel engine Cavitation
I'll give a quick link for our 7.3 Diesels ..... Understanding Cavitation in the 7.3L IDI Diesel
back in the old daze we used to use Water Glass in our engines probably rare to find it today (sodium Silicate) but it was a stop gap method that worked back then.
I'm not trying to say that you have this issue, but only trying to make you aware that it does in fact exist and you can do things to prevent it.
I'll give a quick link for our 7.3 Diesels ..... Understanding Cavitation in the 7.3L IDI Diesel
back in the old daze we used to use Water Glass in our engines probably rare to find it today (sodium Silicate) but it was a stop gap method that worked back then.
I'm not trying to say that you have this issue, but only trying to make you aware that it does in fact exist and you can do things to prevent it.
i ain't rite
Joined: Mar 2005
Posts: 65,507
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From: Marlboro Mental Hospital.
i really really doubt he has cavitation issues since the truck starts and drives fine.
if it had cavitation it would hydrolock after sitting and not start.
clean the top of the engine and start it up. look closely at the thermostat area for leaks. i bet you will find a small coolant leak around the thermostat. could also possibly be a coolant hose with a small leak.
if it had cavitation it would hydrolock after sitting and not start.
clean the top of the engine and start it up. look closely at the thermostat area for leaks. i bet you will find a small coolant leak around the thermostat. could also possibly be a coolant hose with a small leak.
Posting Guru
Joined: May 2015
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I've seen 7.3's with cavitated oil cooler ends where they'll **** coolant out yet the sleeves were fine.
I'd definitely start with resealing the oil cooler if you find it in the oil. You should drain it and check for water after letting it sit over night. Not recommend to drive
Postmaster
Joined: Dec 2011
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Correct, but there are coolant passages in the heads that get blocked off by the intake gaskets. Late model IDIs have plugs in the head in this spot. Early ones(88 at least) have just open holes that are sealed by the intake gasket.
That being said, I'm not sure how likely an intake gasket is to leak, usually they are pretty well sealed when I take it off.
That being said, I'm not sure how likely an intake gasket is to leak, usually they are pretty well sealed when I take it off.
More Turbo
Joined: Mar 2008
Posts: 525
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From: douglasville
You said you havea turbo on it correct? Have you recently had rain in your area? The reason i ask is when i bought my crew cab it had a problem with getting condensation on the dipstick and oil cap during wet weather and it came out to be the seal in the intake manifold valley pan where the turbo oil drains back into the engine, the seal had rotted out and was completely gone. I replaced that seal and no more condensation. Might be worth a look and its a cheap fix if that turns out to be the problem.
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
the oil cooler is really the first place I would look, IF you have water in the oil JMHO
BTW you can look at this post ... seems like a good thing... https://www.ford-trucks.com/forums/1...re-tester.html
the Machine shop I use is Burton Industrial they used to do Radiators too and they have the equipment to Pressure test these oil coolers, not sure how easy it is to find a shop that can test in other places.
BTW you can look at this post ... seems like a good thing... https://www.ford-trucks.com/forums/1...re-tester.html
the Machine shop I use is Burton Industrial they used to do Radiators too and they have the equipment to Pressure test these oil coolers, not sure how easy it is to find a shop that can test in other places.