Author Topic: Intake coolant leak into one port?  (Read 1280 times)

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67428GT500

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Intake coolant leak into one port?
« on: March 09, 2019, 04:22:20 PM »
Has anyone had an aluminum C7ZX leak coolant into a single cylinder (#4) in their travels?

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jayb

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Re: Intake coolant leak into one port?
« Reply #1 on: March 09, 2019, 05:56:18 PM »
Haven't seen that, but #4 is right next to the head water jacket passage.  You could easily be seeing a gasket leak.
Jay Brown
- 1969 Mach 1, Drag Week 2005 Winner NA/BB, 511" FE (10.60s @ 129); Drag Week 2007 Runner-Up PA/BB, 490" Supercharged FE (9.35 @ 151)
- 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA (9.50s @ 143), 585" SOHC
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Gregwill16

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Re: Intake coolant leak into one port?
« Reply #2 on: March 09, 2019, 07:33:06 PM »
+1 Most likely and hopefully a gasket issue.

Dan859

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Re: Intake coolant leak into one port?
« Reply #3 on: March 10, 2019, 12:55:31 PM »
What's the over/under that the gaskets are Print-O-Seals?

67428GT500

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Re: Intake coolant leak into one port?
« Reply #4 on: March 11, 2019, 03:06:02 AM »
No. Not the Printoseals. 1246-S3 Fel Pro. They replaced the pressed paper style Printo seal and have a steel shim. They are extremely hard and don't compress much.  I just went through a mess because of core shift that caused water in the oil because of #6 weeping coolant into the oil.
After a sleeve and reassembly I thought I was good to go. Now #4 has coolant. I bore scoped the hole. What I noted is when it was pressurized It seems the coolant is coming from the top of the cylinder. I have 180LBS compression, so the headgasket doesn't seem to be an issue.
I thought perhaps the right rear side of the intake may be leaking into the #4 intake port while pressurized. There is no sign of coolant without pressurizing the system to 13-15lbs.