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Old 06-23-2013, 02:05 PM   #1
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Default Best solution to block a coolant nipple.

So I dont use the coolant nipple that comes off the back of the 99 heads (maybe all 1.8l heads). I have it blocked off with a rubber vacuum cap and hose clamp. The problem is that ever 6 months (probably 10hrs run time) the thing is rotted out and cracked from the heat and coolant.

I was at the track yesterday and of course it has to let go, so my only option was to take a piece of vacuum line and a bolt and plug it up. So does anyone know of a good solution to block off a coolant nipple that wont rot out. Something that doesn't involve me pulling the head off. This was i don't waste my track time fixing stupid issues.
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Old 06-23-2013, 02:16 PM   #2
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Short length of silicone hose with a bolt or plug clamped into it. Maybe add some rtv if you're feeling feisty.
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Old 06-23-2013, 03:14 PM   #3
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Yeah, those rubber pieces used to fail on me every 4-6 months too. I'm sure there's a high quality silicone piece you can buy, but the easiest method I found was to clamp a short bolt in a piece of high pressure fuel line. That lasted me two years before I pulled the head, and drilled and tapped it.
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Old 06-23-2013, 03:59 PM   #4
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Quote:
Originally Posted by curly View Post
Yeah, those rubber pieces used to fail on me every 4-6 months too. I'm sure there's a high quality silicone piece you can buy, but the easiest method I found was to clamp a short bolt in a piece of high pressure fuel line. That lasted me two years before I pulled the head, and drilled and tapped it.
lol
i just did this on my protege...having exact same issue as the OP
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Old 06-23-2013, 05:44 PM   #5
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yeah everyone i know has had this problem. Just trying to see if there is something better out there than the bolt plug method lol
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Old 06-23-2013, 09:07 PM   #6
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You can either remove the entire fitting and weld up the head, or run a hose around to the water pump inlet in the front. I've started doing the latter after having a bunch of those plugs fail as well.
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Old 06-24-2013, 08:39 AM   #7
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Use can use caps, but you must use caps that are rated for coolant, not vacuum caps, which WILL rot and fail.

I have my rear outlet routed to the #1 port on my IM as a solution, since both those caps failed on me at the same time
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Old 06-24-2013, 11:11 PM   #8
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A somewhat expensive route would be cut the beaded tip off, and install a compression type AN fitting with a cap. Then you will still have the option of using the port if needed later on.
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Old 06-24-2013, 11:24 PM   #9
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well im not removing the head, if i did i would just use a LEE PLUG and be done with the issue forever. i will rock the hose and bolt or a custom machined plug for now.
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