ast elimination - my filler neck nipple plug solution
02-10-04, 09:27 PM
#1
ast elimination - my filler neck nipple plug solution
After contemplating the other solution, I decided to cut off the nipple at the filler neck, drill the hole out, and bolt it up using JB Weld as the sealant.
Here are pics/notes:
The 3/8 tap drill bit and tap set I picked up at homedepot.
The allen head bolt I used to fill the hole.
End result using a small bit of JB Weld around the bolt to make a real good seal.
Install Notes:
1) I used a hacksaw to cut the nipple off, from the bottom up since getting to the top is blocked but the filler neck top lip.
2) I drilled out the rest of the nipple but had my vacuum cleaner handy to suck up the metal shavings. BE VERY maticulous about trying to get the shaving to come outward, not inward...you dont want shaving floating in your coolant system. This is probably best done when you can flush the sytem or with teh filler neck off the car so you can control the shaving problem better.
3) TAKE UR TIME tapping the hole, I went to fast int he begining and stripped out the first 1/4 of the threads i made, the aluminum is VERY soft and with a wrong twist you can stipp away all the threads you just made. Fortunatly there is about an inch of threaded area there so I had plenty of thread left.
4) I used JB Weld as a 'sealant' and it only needs a little since the threads should be nice and tight, and you want to put it up towards the front of the threads so that you dont have JB Weld at the end of the bolt that is exposed to the coolant.
5) Do NOT overtighten the bolt, there is a lot of thread area there but you can easily strip the threads because the aluminum is so soft.
6) Do this mod at your own risk, I am not liable for anything, anytime , anywhere,
Here are pics/notes:
The 3/8 tap drill bit and tap set I picked up at homedepot.
The allen head bolt I used to fill the hole.
End result using a small bit of JB Weld around the bolt to make a real good seal.
Install Notes:
1) I used a hacksaw to cut the nipple off, from the bottom up since getting to the top is blocked but the filler neck top lip.
2) I drilled out the rest of the nipple but had my vacuum cleaner handy to suck up the metal shavings. BE VERY maticulous about trying to get the shaving to come outward, not inward...you dont want shaving floating in your coolant system. This is probably best done when you can flush the sytem or with teh filler neck off the car so you can control the shaving problem better.
3) TAKE UR TIME tapping the hole, I went to fast int he begining and stripped out the first 1/4 of the threads i made, the aluminum is VERY soft and with a wrong twist you can stipp away all the threads you just made. Fortunatly there is about an inch of threaded area there so I had plenty of thread left.
4) I used JB Weld as a 'sealant' and it only needs a little since the threads should be nice and tight, and you want to put it up towards the front of the threads so that you dont have JB Weld at the end of the bolt that is exposed to the coolant.
5) Do NOT overtighten the bolt, there is a lot of thread area there but you can easily strip the threads because the aluminum is so soft.
6) Do this mod at your own risk, I am not liable for anything, anytime , anywhere,
02-11-04, 12:47 AM
#4
PV = nRT
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Looks good, however, I'd use teflon tape next time. It will seal just as well, if not better, capable up to 500F.
So what was the plan here? To eliminate AST completely?
So what was the plan here? To eliminate AST completely?
02-11-04, 01:26 AM
#6
Originally posted by clayne
Looks good, however, I'd use teflon tape next time. It will seal just as well, if not better, capable up to 500F.
So what was the plan here? To eliminate AST completely?
Looks good, however, I'd use teflon tape next time. It will seal just as well, if not better, capable up to 500F.
So what was the plan here? To eliminate AST completely?
yep, eliminating the ast and switching it to evans coolant....I also needed the space the ast was taking with how I want the air filter to sit.
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02-11-04, 08:25 AM
#8
Originally posted by dubulup
Are you rating your own threads? HAHAHA!!
good work man...as always.
Now let me go read your other thread about your new IC...maybe I'll rate that one?!?!?!
Are you rating your own threads? HAHAHA!!
good work man...as always.
Now let me go read your other thread about your new IC...maybe I'll rate that one?!?!?!
02-11-04, 01:04 PM
#9
don't race, don't need to
Did you just cap the radiator connection? For that matter, what was the reasoning behind not just running a hose from the place you plugged to the radiator connection. Not questioning you, just want to know the whole story
02-11-04, 02:01 PM
#10
Originally posted by spurvo
Did you just cap the radiator connection? For that matter, what was the reasoning behind not just running a hose from the place you plugged to the radiator connection. Not questioning you, just want to know the whole story
Did you just cap the radiator connection? For that matter, what was the reasoning behind not just running a hose from the place you plugged to the radiator connection. Not questioning you, just want to know the whole story
The reason wht I didnt just run a hose from the neckfiller nipple tp the radiator nipple is 2 fold:
1) now you have this long run of hose that is a point of failure for the coolng system, I'd rather eliminate as many pooints of failure as possible.
2) if you connect these two you are allowing a very small amount of coolant to bypass the intended flow, not enough to be really significant, but enouhg for me to want to do it anyway :-)
02-11-04, 02:03 PM
#11
>>Not questioning you, just want to know the whole story
no, please, question it all... just because I'm doing somthing dosnt mean I know somthing about what I'm doing :-)
Im not an expert in any of this, I just try to make educated decisions on it.
no, please, question it all... just because I'm doing somthing dosnt mean I know somthing about what I'm doing :-)
Im not an expert in any of this, I just try to make educated decisions on it.
02-11-04, 02:09 PM
#12
94 FD, 69 Datsun Roadster
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About removing the small hose from the radiator to the nipple: I agree that it deletes one more potential hose failure, but I left the hose when I did my AST deletion. It seemed to me that leaving it may allow scavaging of some air bubbles. Not as good as an AST, but better than nothing. Not sure if this is true...heck nobody has proven if the AST is needed. Feel free to shoot me down... 
02-11-04, 02:10 PM
#13
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Originally posted by damian
The radiator nipple is hidden so I used the most suggested method of a very short length of hose on the nipple plugged with bolt and clamped on both ends. I didnt want to use normal rubber caps on either of the nipples since I have herd many times that they eventualy fail under the heat/pressure.
The reason wht I didnt just run a hose from the neckfiller nipple tp the radiator nipple is 2 fold:
1) now you have this long run of hose that is a point of failure for the coolng system, I'd rather eliminate as many pooints of failure as possible.
2) if you connect these two you are allowing a very small amount of coolant to bypass the intended flow, not enough to be really significant, but enouhg for me to want to do it anyway :-)
The radiator nipple is hidden so I used the most suggested method of a very short length of hose on the nipple plugged with bolt and clamped on both ends. I didnt want to use normal rubber caps on either of the nipples since I have herd many times that they eventualy fail under the heat/pressure.
The reason wht I didnt just run a hose from the neckfiller nipple tp the radiator nipple is 2 fold:
1) now you have this long run of hose that is a point of failure for the coolng system, I'd rather eliminate as many pooints of failure as possible.
2) if you connect these two you are allowing a very small amount of coolant to bypass the intended flow, not enough to be really significant, but enouhg for me to want to do it anyway :-)
If you want another hose to eliminate, pull the line and hard pipe running across the top of the engine between the t-stat housing and the rear housing. Only purpose was for TB coolant routing.
But don't use a rubber plug like I did (temporarily). Tap the rear housing and t-stat housing for 1/8" NPT and put a plug in them. NPT sizing will allow you to install nipples again if you need to.
02-11-04, 02:19 PM
#14
agreed clayne, that is another line that can go, wow the top of your engine looks so clean when all the hoses are out of the way :-)
on a side note I'm bummed because I was going to get another set of yellow thermalflex silicone hose for the track car but talked to thermalflex and they no longer take single orders, they need like min 10 orders to even make a run :-(
here is the link to the set I put on my street car (that was also a track car before i got the other car...hehehe)
https://www.rx7club.com/showthread.p...ht=thermalflex
on a side note I'm bummed because I was going to get another set of yellow thermalflex silicone hose for the track car but talked to thermalflex and they no longer take single orders, they need like min 10 orders to even make a run :-(
here is the link to the set I put on my street car (that was also a track car before i got the other car...hehehe)
https://www.rx7club.com/showthread.p...ht=thermalflex
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