Tapped a hole through cylinder head, am I ok? - JeepForum.com
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post #1 of 22 Old 01-19-2020, 03:33 PM Thread Starter
bcessario
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Tapped a hole through cylinder head, am I ok?

I have an 87 yj. I replaced the plastic valve cover with an aluminum one. I had tap two new holes on the drivers side, when I did I drilled through And anti freeze came out. When I put in the 2 new bolts it stopped the antifreeze from coming out. Seems to be ok, but not sure. Should I put some silicone in with the two bolts to be sure? I am getting a little white smoke in the exhaust but I think it’s just the initial antifreeze that poured into the valves when I initially replaced the valve cover.
Any thoughts?

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post #2 of 22 Old 01-19-2020, 03:52 PM
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I hope you used thread sealant on those bolts? I like Loctite 577.


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post #3 of 22 Old 01-19-2020, 04:50 PM Thread Starter
bcessario
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I did not, but I can now. So loctite and not silicone?
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post #4 of 22 Old 01-19-2020, 05:19 PM
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You can use a gasket maker but don't use loctite or silicon. Loctite isn't a sealant and silicon doesn't hold up in an engine environment. Use a water pump RTV gasket sealant.

Really not sure why you had to drill holes. You put the cover on backwards?

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post #5 of 22 Old 01-19-2020, 05:25 PM Thread Starter
bcessario
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The aluminum cover bolts into the head where the old plastic cover used 4 or 5 washers that clamped down on the valve cover. So you’re saying use the gasket maker on the bolts?
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post #6 of 22 Old 01-20-2020, 02:28 AM
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You can use any brand of liquid thread sealant you want, apply it to the threads and go.

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post #7 of 22 Old 01-20-2020, 04:47 AM
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Quote:
Originally Posted by Awesome View Post
Loctite isn't a sealant and silicon doesn't hold up in an engine environment. Use a water pump RTV gasket sealant.

I absolutely recommend Loctite 577. It is a thread sealant and is made specifically for this type of application.
Do NOT use RTV, it is meant to replace a gasket. It is NOT made to seal threads.

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post #8 of 22 Old 01-20-2020, 04:49 AM
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I would of never drilled holes into my block for a valve cover..
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post #9 of 22 Old 01-20-2020, 11:06 AM
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Quote:
Originally Posted by WestfieldMX5 View Post
I absolutely recommend Loctite 577. It is a thread sealant and is made specifically for this type of application.
Do NOT use RTV, it is meant to replace a gasket. It is NOT made to seal threads.

Aha, ok. I thought it was standard red Loctite.

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post #10 of 22 Old 01-21-2020, 08:25 AM
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Quote:
Originally Posted by phillipyj View Post
I would of never drilled holes into my block for a valve cover..
Head is where the Rocker Cover mounts

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Originally Posted by bcessario View Post
...when I did I drilled through And anti freeze came out. When I put in the 2 new bolts it stopped the antifreeze from coming out.
SI am getting a little white smoke in the exhaust but I think it’s just the initial antifreeze that poured into the valves when I initially replaced the valve cover.
Any thoughts?
.5) what motor have you?

1) Use the sealant recommendation
2) no coolant can get into the valves while replacing a Rocker Cover.
3) my thoughts are if you truly have white smoke and no water in oil or oil in water you need to take it somewhere and get the head gasket replaced.

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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post #11 of 22 Old 01-21-2020, 02:50 PM Thread Starter
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A 4.2. Coolant got into the valves when I was replacing the cover. Burned smoke for a bit but not anymore
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post #12 of 22 Old 01-21-2020, 02:56 PM
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Originally Posted by bcessario View Post
A 4.2. Coolant got into the valves when I was replacing the cover. Burned smoke for a bit but not anymore
How could coolant get into the valves?
Did it get dumped down the throttle body?
There is no coolant under the Rocker Cover.

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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post #13 of 22 Old 01-21-2020, 07:17 PM
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Originally Posted by fishadventure View Post
How could coolant get into the valves?
Did it get dumped down the throttle body?
There is no coolant under the Rocker Cover.
Because he drilled holes into the water jacket for some unexplained reason.

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post #14 of 22 Old 01-21-2020, 07:23 PM Thread Starter
bcessario
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So...when you go from a plastic cover to aluminum on a 4.2, you need to drill 2 holes. There are 2 beads on the drivers side that are the spot you need to drill. I tapped too far, maybe 1/2 inch. It is what is called for by instruction, I just tapped too far in
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post #15 of 22 Old 01-21-2020, 07:24 PM Thread Starter
bcessario
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I’m assuming loctite will seal it so that nothing seeps up, that was my question...
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