Mazco Nosecone issues

[Baja16]

Any of you guys that have installed Mazco nosecones have trouble with the threads on the top of it for the water fittings??? I put one a my 2.6 Evinrude case, got it all filled in and painted nice but now none of my fittings will screw in more than 3/4 or 1 turn then they stop. So i got myself a 1/2 NPT tap ran it in there (which went in fine), then tryed my fittings and no better. I couldnt run the tap far enough through the holes to widen it cause it was gettin to close to the other side. I bought Russell fittings which dont work nor the supplied brass fittings. So after the the tap failed to help i got a brass drain plug ran it in and out to widen the threads whiched worked good intill some of the fresh cut AL. got caught in the brass drain plug and and took out some of the threads:mad:. i guess thats i get when i use a drain plug as a tap:rolleyes:

Any ideas now? I'm thinkin about just drillin the threads out and epoxying the stupid fittings in, thats the only way i see i can do it without f***ing up my paint. This really really sucks... screwed up threads and two ruined russell fittings which arent cheap!!!

[Carter Powell]

You can definately us an epoxy like JB weld to hold everything in place. You will not blow the thing out. Just make sure that you don't block any of the flow on the inside where the water is going to the pump. I have repaired a couple that were messed up years ago. They are still working fine. Back when I used to do a lot of nosecones I did not like using the brass fitting and the hose. What I used was a flexible stainless steel segmented tubing and just epoxied (with west 404 filler added ) the tubing into the holes and about a 45 degree angle and then made a fillet to blend the hose right into the side of the case. When it was finished it looked better than you could imagine. I actually flow tested this system and it flowed as well as any two hose system just because of the gentle curver and not having to make any 90 degree turns. If you ever want to try this I will post some picture of what it looks like for you.


Best wishes, Carter Powell

[Charger200]

try a plastic fitting and screw it in as far as you can then glue it...the glue shouldnt melt the plastic fittng

[Baja16]

thats a good idea Charger but i would like to stick with the russell fittings if i could.

Carter thats a cool idea on runnin the hose like that, might have considered doing that but its all painted up and looks to good to mess with... post some pics of the hose routed like that!!!

think i'll reem the holes out a bit so i can just epoxy my fitting in, then just do some touch-up aroung the fittings.

[RNM018]

Grind the end of your tap past the starting threads . That will let it clean up all the damaged threads and should still be able to use the Russel fittings . Be sure and use a lubricant while tapping aluminum ,to help keep the aluminum from sticking to the tap and binding up as your brass plug did . If the fitting still fits a bit loose after this , just wrap it well with teflon tape ,or applie loctite to it and let it cure well before using it . Rich Martin 018:cheers:

[Charger200]

no no no dont use lock tight....it will work but you will NEVER get that fitting out....unless that is the goal....use gas line teflone tape?( thicker stuff) and if you can get your hands on it either TF 15 pipe dope, or masters metallic pipe dope...wrap the tape in the direction of the threads about 3 wraps then put the dope on in the same direction and be generous ....leave the first thread free of tape or dope.....with that system you will /not have a leack unless the threads are f'ed...both dope compounds have sealing compunds

[Streamin101]

Grind the end of your tap past the starting threads . That will let it clean up all the damaged threads and should still be able to use the Russel fittings . Be sure and use a lubricant while tapping aluminum ,to help keep the aluminum from sticking to the tap and binding up as your brass plug did . If the fitting still fits a bit loose after this , just wrap it well with teflon tape ,or applie loctite to it and let it cure well before using it . Rich Martin 018:cheers:
:iagree:
But are you guys sure that these fittings are all the same thread, since there are different variations of pipe thread.
For example NPT vs a straight thread?

[Baja16]

i'm using all NPT thread and fittings... i will have to see if i can buy a tap, the one i'm using is one my uncle "barrowed" from work for me for the weekend. i'd have to grind off a large portion of the tap to widen the hole. i can get it in half way and it still isnt enough for me to get the fitting in a couple of turns. I looked at my russel fittings and there is some serious taper compared to the brass drain plug. the drain plug would go in at least three turns while the russels would one. i know there is only one NPT thread there are no variations so i dont know why there would be so much taper in the russel fittings. Also i'm afraid that the threads on one side of the cone my not be fixable cause theres not a whole lot of meat left.

[Tom Foley]

Harbor freight has the cheapeast taps and do what Rich said , then seal with JB on the threads as you go in . :cheers:

[Charger200]

ahh thus os your problem...npt threads are for fittings and pipe....standard threads for hardware...the russels is a hardware fitting..rent a std thread tap and you should be all good...npt threads should be about 11-14 threads per inch tappered with the fist 7 threads being the perfect(sealing) threads

[TUFFboat]

If desperate, and you don't want to sacrific the borrowed tap... You can try to walk the tap around in a circle as you are turning (tapping) the tread. Its like a sloppy way to make it into a taper.

[FlowMaxx]

hope you spot welded the cone on.

[Baja16]

ahh thus os your problem...npt threads are for fittings and pipe....standard threads for hardware...the russels is a hardware fitting..rent a std thread tap and you should be all good...npt threads should be about 11-14 threads per inch tappered with the fist 7 threads being the perfect(sealing) threads


you may be on to something... i ordered my fittings from summit racing and i just looked in thier catalog and some are NPT and others arent. I'm gonna go to an automotiveplace on monday and get two new fittings cause mine are a little mest up, i'll have to make sure the new ones are NPT:cheers:

[Baja16]

hope you spot welded the cone on.



yes sir i did...

[FlowMaxx]

The cone in my sig picture is a Mazco :D

[RNM018]

NPT threads are tapered . That's why you should be able to run the tap in further and get it to work . I'm no plummer , but if it where a straight thread , it would not be NPT(National Pipe Thread) I beleive is what it means.

Did this nose cone come with fittings? Are they tapered or not ? As for not using LOCTITE . Why would you ever want to remove this fitting ? And if you did need to ,it will come out . I use LOCTITE 635 Retaining compound on aluminum every day ,and then remove it 5 years later ,without a problem .

Well , Good Luck ! Rich Martin 018:cheers:

[Tom Foley]

There was a play ..possibly by William Shakespeare .."Much to do about nothing " I think this applies at this point .

[JR IN JAX]

Used to, all fittings were pretty much NPT [tapered pipe thread] but recently we are seeing straight fittings that shoulder up with an O ring seal that are called SAE like a standard automotive engineering bolt.

[jeff dunn]

NPT is pipe threads, they make shorter projection npt taps,so you can tap deeper or clean out threads, like the other post said grind off your tap, never seen a straight thread npt. Jeff

[Baja16]

OK guys i got it... thanks for the idea RNM018 ( grindin the tap down to make the hole wider ) worked the nuts man:thumbsup: thankyou!!!

Hey FlowMaxx I'M COMMIN FOR YOU:eek:... this spring, Me and Streamin101 are gonna have to represent Old Skool Streams at Three Lakes with you guys:cool::cheers:

[RNM018]

GOOD DEAL , Glad I Could Help !!! Rich Martin 018:thumbsup:

[Laker]

Hey FlowMaxx I'M COMMIN FOR YOU:eek:... this spring, Me and Streamin101 are gonna have to represent Old Skool Streams at Three Lakes with you guys:cool::cheers:

Sweet! We will Have to put together some Hyrdrostream photo sets for the 3 lakes PowerTour stop and get some multiboat passes on film!!:reddevil::cheers:

[Riverman]

Funny, on my Mazco cone the fittings were not removable. Almost like the aluminum was cast around the brass.