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Old 10-13-2013, 06:24 PM
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Question Diesel in coolant after cups changed

Full story: Buddy borrowed excursion and trailer for holiday. Took out water pump and overheated. Had ford dealer do a replacement on pump. Rig got home and appeared to be loading a cylinder occasionally on start up. Researched and figure cracked injector cup so we replaced all 8 and did all injector rings.

Still have diesel in coolant over flow. Thinking a cracked head. Any way to zero it down to one side or other or do you have to remove and get lucky?

Could it be something else?

Thanks in advance.
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Old 10-13-2013, 08:11 PM
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Did you flush the coolant system? There could still be a significant amount in the block after you pulled the heads.

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Old 10-14-2013, 05:40 PM
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We have flushed a couple of times. Should it take more flushing? I amusing distiller water to flush the system and have not added coolant yet. The coolant reservoir is over flowing as it appears excess diesel is getting into the coolant system.
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Old 10-14-2013, 08:54 PM
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Quote:
Originally Posted by 2000 7.3 excursion View Post
We have flushed a couple of times. Should it take more flushing? I amusing distiller water to flush the system and have not added coolant yet. The coolant reservoir is over flowing as it appears excess diesel is getting into the coolant system.
Well. You could try cups again. Did you use the loctite retaining compound on the cups? But I highly suggest pulling the heads to have them checked.

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Old 10-22-2013, 01:56 PM
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No we did not loctite on cups. Think we will pull heads and inspect. If cracked any after market heads to recommend? Do you replace them in pairs or does it matter?
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Old 10-22-2013, 04:49 PM
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Quote:
Originally Posted by 2000 7.3 excursion View Post
No we did not loctite on cups. Think we will pull heads and inspect. If cracked any after market heads to recommend? Do you replace them in pairs or does it matter?
I guess there is a trick to the trade when doing cups in a 7.3. I was told this by one of the old guys at blackwater. They need to be kinda peined/knurled slightly is what he described, and you NEED to use the retaining compound. IIRC it is loctite 620?? Its green lable I believe.
Depends on where exactly the possible crack(s) may be. If you end up needing them, I'd recommend blackwater, they are very knowledgeable with many diesels, especially the 7.3.

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Old 10-22-2013, 04:58 PM
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This is way to test for cracks around the cups to narrow down left or right.

Pull all 8 injectors, put cooling system back together and fill. Using a pressure tester pressurize the cooling system to 16psi and then look down into each inj hole. Look for coolant seeping around the cups or from cracks around the cups.
Also some only leak when hot, so plug the block heater in and let it sit over night then check.


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