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Forums->Hot Heads Tech Talk->New 241 Dodge Build - coolant coming from #5 exhaust port???

FireDomeTim5
New 241 Dodge Build - coolant coming from #5 exhaust port???


Hello everyone!

I’m looking for help from the experts on what has been a tough day for me! I recently finished up my build of a 1954 241 RedRam Hemi. The engine is slated to go in a little ‘29 roadster hot rod that’s all period correct for the 1950s. I built the engine fairly stock - stock water pump, heads, everything very straight forward. All new parts aside from an early Edmunds 2 Deuce intake. I had it already to go on the engine run stand to break it in tonight and was excited! Everything was looking good until I put coolant in the system. I had her almost all the way topped off when I looked over and saw a steady flow of antifreeze coming out of the left-hand exhaust. I quickly removed the exhaust manifold on that side and noticed it was coming out of the number five exhaust port. The others were dry.

Luckily the valves were closed on that particular cylinder, so no coolant got into the cylinder itself. I had the intake fly cut just slightly because of its age and was really careful about it’s fitment knowing it was a bit of an antique. Is it possible that devil is leaking into the cylinder because the gasket isn’t sealing? Could it be something worse, like a cracked cylinder head? I thought of using some kind of a camera to look up in that port and see if I could notice anything. I didn’t do any major work to the cylinder heads other than a valve job and some very light porting. The intake mating surface wasn’t touched nor were any of the surfaces of the block milled/machined down.

Iknow it’s a longshot, but I thought I would drop a note here in case anyone else has had this issue! Thanks in advance for any guidance you can give me!


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on: Wed 17 of Oct, 2018 [04:51 UTC] reads: 641

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FireDomeTim5
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Re: New 241 Dodge Build - coolant coming from #5 exhaust port???
on: Fri 19 of Oct, 2018 [18:51 UTC] score: 0.00
Thanks Hemi Stude!

I think you may be right. I used a small camera and looked up into the port with a light last night. Tucked right up underneath the valve guide in the exhaust port I found what looked to be a crack in the head with a chunk completely missing. That would explain how fast the fluid is running out! I guess the next step is to pull the head off and replace it. I have an extra 241 head that I can hopeful transfer all of the new parts to. So close, but so far away!! I had the machine shop check everything for cracks so I am not sure how they missed it. The guy who did the work is a really nice guy. I feel bad, but do you think I am fair in asking him to help me out on the new head's machine work?

I took a video looking into the port and will post a link to it to see if what I am seeing looks the same to you. Just when I thought I was close to cruising down the highway!! :-(
>

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George
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Re: Re: New 241 Dodge Build - coolant coming from #5 exhaust port???
on: Mon 29 of Oct, 2018 [17:35 UTC] score: 0.00
I had the machine shop check everything for cracks so I am not sure how they missed it. The guy who did the work is a really nice guy. I feel bad, but do you think I am fair in asking him to help me out on the new head's machine work?
>
Obviously a flaw in their system....can't hurt to ask.

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hemistude
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Re: New 241 Dodge Build - coolant coming from #5 exhaust port???
on: Fri 19 of Oct, 2018 [16:01 UTC] score: 0.00
"I had her almost all the way topped off when I looked over and saw a steady flow of antifreeze coming out of the left-hand exhaust. I quickly removed the exhaust manifold on that side and noticed it was coming out of the number five exhaust port. The others were dry."

>
> If the valves were both closed and the coolant was coming out through the exhaust port, unless I'm wrong, there's no way it can come out there except through a crack in the head. did you have the heads mag'd before you rebuilt them?

If the engine is on the stand, you might be able to turn off all the shop lights, position yourself and peer into the port with a flashlight and find the source of the coolant. There's really no passage in the water jacket that could leak into the port unless it is cracked. A compromised head gasket would generally only create a leak into the combustion chamber but you said that's dry. Are you certain about that?

Dave





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Jack
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Re: New 241 Dodge Build - coolant coming from #5 exhaust port???
on: Wed 17 of Oct, 2018 [17:12 UTC] score: 0.00
Its not uncommon to get coolant seeping past the studs. But a steady flow sounds like something worse.
So if you are sure its coming from the port that's not it.
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