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Old 05-15-2011, 06:52 PM   #1
blownzoom440
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Default screw in water plug threads?

i only have a few good threads in the 1 area and it is not sealing well.i use RTV.would it be worth it to tap it bigger?or deal with it with sealer?
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Old 05-16-2011, 10:52 AM   #2
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Default Re: screw in water plug threads?

Tap it bigger or Helli coil it .

good luck
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Old 05-16-2011, 11:27 AM   #3
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Default Re: screw in water plug threads?

liquid teflon pipe thread sealant......
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Old 05-16-2011, 04:30 PM   #4
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Default Re: screw in water plug threads?

thank for the tips!
both rear plugs leaked on the dyno.to get them to stop took about 70ft.lbs and silicone.to tap it 1 size bigger actualy takes a lot if i understand correctly.the threads are NPT no?the engine is togather so a tap or sealer is my best bet i think.not sure on the size i have in the block.any help appreciated!
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Old 05-29-2011, 07:24 AM   #5
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Default Re: screw in water plug threads?

do you think there is a way to put epoxy in there and tap it to fix the low area in the threads?
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Old 05-29-2011, 11:58 AM   #6
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Default Re: screw in water plug threads?

it appears to be a chrysler block.

you can cut the taper pipe thread slightly deeper, but because of the shallowness of the backside wall hitting, you have to cut the tap off "shorter"... so, you probably have to buy two taps and cut one off more than the other...
as noted, the actual "plug" has to still be no less than flush with the outside face of the block..make certain that the sample plug that you are using is as long ( and as large of outside diameter as it can be they do in fact vary in length and diameter from maker to maker) so,
try a number of different plugs...
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Old 05-29-2011, 12:22 PM   #7
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Default Re: screw in water plug threads?

thanks for the great advice,info!i am searching some good suppliers localy for the tap,plug.
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Old 05-29-2011, 12:33 PM   #8
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Default Re: screw in water plug threads?

you will have to use a wide and hard cutoff wheel mounted on a bench grinder...

dont get it blue hot when you do the cutting.

as said, you may have to buy two taps and cut one off just a little bit ( test fit) and then cut the other one off to whatever the limit is needed in comparison to the actual threadded plug that you are fitting it all to.

as said, dont forget that there are many varying diameters of the finish plug...it depends on who makes the plug.

the common accepted standard of diameter is when it is near tight, there are still three threads shown...but as said, there are plugs that are larger than this..and this is the type that you want..

if you cut the tap off too far, and then thread it in and cut threads to the wrenching end- end of the tap, ... then there is a certain area that will then have STRAIGHT THREADS..and this will never seal as you asked...

I n thirty years, I have seen a few of these that have had to be braized welded after the plug was threadded in...
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Old 05-29-2011, 12:36 PM   #9
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Default Re: screw in water plug threads?

due to the thin cross section in comparison to the diameter,
it is real easy to thread it in crooooked....
use a cross handle...not a cresent wrench...
go slow, only 1/8 - 1/12 th turn at a time..when it gets stiff, stop and reverse and clean out the chip.
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Old 05-29-2011, 12:43 PM   #10
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Default Re: screw in water plug threads?

thanks,i have 1.250 to the cylinder wall from the beginning of the threads.i will take my time and do as you say.
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Old 05-30-2011, 03:40 PM   #11
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Default Re: screw in water plug threads?

i got a tap and it bottoms on the cylinder wall[at full thread contact] so i will have to cut the tap maybe .500 to let 5 more threads of the tap work and go from there.
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Old 05-30-2011, 09:36 PM   #12
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Default Re: screw in water plug threads?

JB Weld or Moroso A&B epoxy
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Old 05-30-2011, 09:42 PM   #13
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Default Re: screw in water plug threads?

i would trust the moroso more but the jb is local.i am going to an iron plug from aluminum and that should help the jb bond to the iron block also.
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Old 05-30-2011, 09:51 PM   #14
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Default Re: screw in water plug threads?

I would build up with JB and retap threads and then maybe mix somemore up and use on threads of plug have had good luck with it on intakes with problem pipe plugs before had a tig welder
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Old 05-31-2011, 04:00 PM   #15
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Default Re: screw in water plug threads?

DONT JUST TAP IT DEEPER
without FIRST having a known oversize plug to TEST fit the larger diameter TAPER.

you can easily thread it too large in comparison to whatever actual plug that you can GET.
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