Oil drain petcock

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bill goodheart
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Oil drain petcock

Post by bill goodheart » Thu Oct 15, 2020 2:00 pm

Should the threads on oil drain petcock have anything on them for a seal ? Such as pipe dope, thread tape etc.


big2bird
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Re: Oil drain petcock

Post by big2bird » Thu Oct 15, 2020 2:02 pm

Yes. They are tapered pipe fittings.

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Rich Eagle
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Re: Oil drain petcock

Post by Rich Eagle » Thu Oct 15, 2020 2:07 pm

I use Teflon tape with good results.
When did I do that?


Norman Kling
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Re: Oil drain petcock

Post by Norman Kling » Thu Oct 15, 2020 4:29 pm

Are you referring to the petcock to check the oil level? I have not seen one for the drain, and would be concerned that you might get it caught on something and loose all your oil. The oil drain is a plug. Some cars have a pipe plug and others have a hex head with a copper ring between the plug and the crankcase. If you are using the oil level petcock to drain the oil, you will still have about 3 quarts of old oil in the crankcase.
Norm

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Quickm007
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Re: Oil drain petcock

Post by Quickm007 » Thu Oct 15, 2020 4:34 pm

I use Teflon tape the one we used with gas. The packaging is yellow and the Teflon is thicker and much more resistant than regular Teflon.
Super Mario Bross ;)

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Topic author
bill goodheart
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Re: Oil drain petcock

Post by bill goodheart » Thu Oct 15, 2020 5:49 pm

I am referring to the petcocks to check oil level, sorry calling them oil drain caused confusion. I appreciate all the responses, I think I will use the Teflon tape.


Allan
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Re: Oil drain petcock

Post by Allan » Thu Oct 15, 2020 6:34 pm

The petcocks have a tapered thread and it is not necessary to use any sealant if they are tight, but doing so is good insurance. The tapered thread means they will tighten up OK, but they may be differently oriented. If you want to use a tool to check the levels, this may be a problem. Then the tape can come into its own by sealing up he threads on a petcock which is not absolutely tight but is left oriented as required.

Allan from down under.


Art Wilson
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Re: Oil drain petcock

Post by Art Wilson » Thu Oct 15, 2020 8:52 pm

I had a petcock come loose and fall out when I used Teflon tape for sealing the threads, but only tightened it to the position I wanted instead of fully tightening it.
Luckily I caught it in time so no damage occurred.

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