bought two Aeroquip -10AN male-male fittings today, going to drill and tap my valve cover and screw these in to vent crankcase pressure. Now I need to go buy a tap. What tap do I need and will they have it at a regular hardware store?

Here's the fitting:
http://store.summitracing.com/...M2054

 

Two of these welded to the valve cover would work a lot better.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by entr0py &raquo;</TD></TR><TR><TD CLASS="quote">Two of these welded to the valve cover would work a lot better.</TD></TR></TABLE>

yeah I know I saw that in another thread. but I don't know how to weld, and I don't feel like paying someone to weld it when I can just as easily drill and tap it myself...

 

Why not use a fitting that is like 3/8NPT to 10AN instead? it would be a lot easier. i dont even know where to buy AN fitting taps.

 

I would've gone with a bulkhead fitting or an NPT to -AN adapter fitting. NPT taps are not hard to find at all.

 

yeah I guess in hindsight I should have bought an NPT to AN coupler... would have been easier to find a tap...

 

AN stands for Army/Navy , they are speific threads. I belive that MSC sells the taps
if not aeroquip i think sells the .

 

I think it is 7/8-14 thread. -8 is 3/4-16. I have the Spec at home otherwise I would post a solid answer up.

They are standard threads, nothing special. The spec is more focused on the dimensions of the flare, I.D., and other features.

 

I would use an AN o ring fitting.



Like those. It'll seal better than using an AN to AN. Same threads as the AN fittings though.

 

Tapping the valve conver and putting that fitting in will probably not work. The valve cover is too thin and the threads won't have much to bite onto. You'll eventually strip the threads out. Either get the fitting welded which is best or use a bulhead fitting which will require you to put a screw with aluminum crush washers on the back side of the fitting.

 

the idea is faulty. A straight thread AN fitting is designed to seal using an o-ring. You would need to cut an o-ring groove into the valve cover too. Believe me, I used to be a machine builder, and I've made many o-ring manifolds, and the only way to do it is on a Bridgeport, or CNC mill. You could try to chuck an o-ring groove cutter into your drill motor, but the result would be total garbage. Your best bet is to cut pipe threads into the valve cover, if you are against getting things welded. But as someone stated before, you don't have enough material to give you proper thread-depth.

 

Just FYI: AN threads are just plain ol' SAE Inch threads:

Here's a chart from Earl's

http://www.holley.com/HiOctn/P....html

 

Wow, what do you know? Earls has it wrong on their own site!
Anyway, if you look closely at the thread size for AN 10 it doesn't make any sense. Yeah, 7/8-14 is the correct size. Just realize that the price of the tap might be half of what a welder is going to charge...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boondock Saint &raquo;</TD></TR><TR><TD CLASS="quote">the idea is faulty. A straight thread AN fitting is designed to seal using an o-ring. You would need to cut an o-ring groove into the valve cover too. Believe me, I used to be a machine builder, and I've made many o-ring manifolds, and the only way to do it is on a Bridgeport, or CNC mill. You could try to chuck an o-ring groove cutter into your drill motor, but the result would be total garbage. Your best bet is to cut pipe threads into the valve cover, if you are against getting things welded. But as someone stated before, you don't have enough material to give you proper thread-depth.</TD></TR></TABLE>

yeah but it's not that big of a deal if it doesn't seal perfectly... it's just a vent to vent air pressure. I actually borrowed a 7/8-14 tap and did it and it works fine. Thanks to everyone that helped.

 

i could use a little bit of epoxy around the edges when you screw it in when you tap it, that should make a good seal. Search for epoxy - 80, its crazy ****.

Or may i dare say....jb weld would work well also

 

Just another idea. If you used the fittings with the o-rings and then found yourself a nut to screw on to it you could drill a hole in your oil cap and put the nut on the inside of the cap ? I have never done it that way but I bet it would work. Although you may have to build some kind of baffle to keep oil from coming out.

 

THe point, I think, is that tapered threads are intended for applications where you do NOT want the threads to leak. These are not tapered threads because they have a rubber seal.

 

I used O-rings... I found some in my toolbox that fit over the threads nice and snug...

 

what setup did you go with to vent your crankcase? do you have 2 seperate cans? one for the block and one for the valve cover.

 

I dont know who.. But someone makes a Honda oil Cap .. with the -10 fitting in it .. Search around..

 

for what your going to pay for a tap of that size 7/8 x 14 you can get the fittings welded and not have any problems the cover is not thick enough and the fittings need an oring to seal

 

it wont work unless u somehow space he fitting from the valvecover... that little space between the thread and the middle of the fitting is thicker than the vale cover material itself in most places, therefore it will just dangle there... u wont be able to make it tight...

secondly i dont *think* tapping it with 14tpi w

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by havok hybrid &raquo;</TD></TR><TR><TD CLASS="quote">I dont know who.. But someone makes a Honda oil Cap .. with the -10 fitting in it .. Search around.. </TD></TR></TABLE>

didnt found it

 

Z10 makes that oil cap fitting. look at http://www.z10motorsports.com under engine &gt; block fittings.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by angry_LS &raquo;</TD></TR><TR><TD CLASS="quote">

Z10 makes that oil cap fitting. look at http://www.z10motorsports.com under engine &gt; block fittings. </TD></TR></TABLE>

Is it just me or is Z10's website ridiculously hard to find anything on? Where are you clicking to find engine block fittings? The only two things I see linked to the main page are oil pans and a link to K-series dry sump systems.