Wet head question.
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Road Master
Joined: Mar 2017
Posts: 894
Likes: 224
From: Lynden, WA
Wet head question.
Can anyone tell me if coolant flows through the head gasket of the 103 twin cam engines in the 2014 and up bikes? I just helped my brother put together a 107 with ported heads, the heads are ported stock heads and are an exchange deal. We got it all done and the motor sounds great but once it warmed up it started pissing coolant out of the rear head. Its coming out of the head gasket under the exhaust port. Im guessing the heads cracked because I was under the impression coolant only flowed through the head. Thanks for the help.
Seasoned HDF Member
Joined: Jan 2008
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From: Kansas City, Missouri
The way I understand it the coolant flows thru water jackets in the heads around the exhaust valves to cool down that portion of the head. So I believe you assumption would be correct. Bummer
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Road Master
Joined: Mar 2017
Posts: 894
Likes: 224
From: Lynden, WA
That was my understanding too. Theres no water jackets in the cylinders. I was just making sure Im not crazy. Well this sucks. Guess Ill give em a call on Monday.
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Road Master
Joined: Mar 2017
Posts: 894
Likes: 224
From: Lynden, WA
yeah...something. I was looking over the engine trying to find the drip, I figured I got an O ring leaking on one of the fittings in between the 2 cylinders or something but once the engine got warmed up it started bubbling out of that corner of the head unfortunately. I was hoping it was just one of the coolant lines leaking but that side of the head is totally dry, but you can clearly see it bubbling out by the head gasket once the leak really started goin after it got hot. So Im afraid the head is probably cracked or they got into a water jacket when they did all the machining on the head....
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Road Captain
Joined: Nov 2010
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From: huntersville nc
Or a bad cast when the head was made and the port job made it show up, good luck I know that sucks and hope you get it right,
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Seasoned HDF Member
Joined: Oct 2012
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From: St.Louis Mo.
I believe the wethead and the oil cooled bikes use two different head gaskets. I also think the water jacket comes in contact with the head gasket right there. Maybe a cracked head or mismachined,
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Road Master
Joined: Mar 2017
Posts: 894
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From: Lynden, WA
i dont believe thats true. Im pretty sure the oil cooled and water cooled bikes use the same cylinders and head gaskets. Oil/coolant only flows through the head. Im guessing either the head is cracked or it was a bad casting and when they machines the head they got into a water jacket. Im not really mad at the company because it is probably just a pin hole you cant even really see, the head was probably checked for cracks and pressure tested BEFORE it was rebuilt not after. I just hope that they stand behind this and take care of it and dont make me jump through a bunch of hoops before they send me another head.
Last edited by Kyle Moore; Feb 17, 2019 at 02:17 PM.