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Username Post: '89 intake mant. heater nipple help ??        (Topic#348580)
weld123 
Contributor
Posts: 160

Reg: 10-20-07
12-06-17 08:28 PM - Post#2717130    

Just bought a 89 chev. 5,7 half ton. I'm losing water/coolant from between the male to female threads of the pipe/nipple that goes to heater core.

I've dealt with these cheapo potmetal factory nipples before, and replaced them with aftermarket steel ones.

But, this one has some alum colored epoxy or something caked around a standard steel water pump pipe nipple, and put a typical heater hose to it.. So, I'd bet the female threads are messed up in the alum intake.

It is also a aftermarket alum intake mant.

I'd like to pull this nipple out, and try to putty/epoxy it again. Anyone know of any of the better products to use for this? Also, if that dont work, anyone know of any tricks, or re-tapping for something metric or slightly bigger? any suggestion would be helpful.





Edited by weld123 on 12-06-17 08:33 PM. Reason for edit: No reason given.

 
rockfangd 
"5th Year" Gold Supporting Member
Posts: 2437
rockfangd
Age: 32
Loc: Utica ny
Reg: 04-13-10
12-06-17 08:51 PM - Post#2717132    
    In response to weld123

Ouch. Been there before.
how tight does it look into the intake?

Old School GM fan FOREVER


 
weld123 
Contributor
Posts: 160

Reg: 10-20-07
12-06-17 08:57 PM - Post#2717134    
    In response to rockfangd

Well, it looks threaded in straight, to about the proper depth. But leak is getting worse.



 
454cid 
Valued Contributor
Posts: 2861
454cid
Age: 45
Loc: West Michigan
Reg: 02-18-12
12-06-17 09:08 PM - Post#2717137    
    In response to weld123

Have you removed the nipple and inspected the threads in the intake manifold?

Maybe someone just used the wrong garbage to "seal" the threads. You can use teflon tape, or pipe dope..... I typically use pipe dope.

99 K3500 RCLB


 
weld123 
Contributor
Posts: 160

Reg: 10-20-07
12-06-17 09:14 PM - Post#2717140    
    In response to 454cid

No, I just noticed this yesterday, and am already having other pickup issues of being outa service.

So, kinda want to gather a couple gameplans, for when i do take it out, that hopefully i can drive it right away.

Any specific pipe dope? I used to use rector seal, on gas lines when i did plumbing, which was good stuff. But don't know how well it would work in this application.



 
454cid 
Valued Contributor
Posts: 2861
454cid
Age: 45
Loc: West Michigan
Reg: 02-18-12
12-07-17 08:05 AM - Post#2717174    
    In response to weld123

  • weld123 Said:
No, I just noticed this yesterday, and am already having other pickup issues of being outa service.

So, kinda want to gather a couple gameplans, for when i do take it out, that hopefully i can drive it right away.

Any specific pipe dope? I used to use rector seal, on gas lines when i did plumbing, which was good stuff. But don't know how well it would work in this application.



I might have Harveys or I think I have something that I got second hand with a tool lot at an auction or yard sale. It probably doesn't matter as long as it's rated for water.

I don't think you're going to know exactly what to do until you can take it apart and examine that area. If you've done plumbing work, do you have pipe taps? If the 1/2" thread is shot, is there enough meat in the intake to drill and tap it to 3/4" npt? A 3/4"npt to 3/4" barb should be easy to find.


99 K3500 RCLB


 
raycow 
Honored Member
Posts: 27580
raycow
Loc: San Francisco, CA
Reg: 11-26-02
12-07-17 10:21 AM - Post#2717186    
    In response to weld123

If the manifold has enough material to tap it 3/4" NPT, you could install a 3/4"x 1/2" bushing and a new 1/2" steel hose nipple, or the nipple you have now if it isn't damaged.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
weld123 
Contributor
Posts: 160

Reg: 10-20-07
12-07-17 09:02 PM - Post#2717250    
    In response to 454cid

I believe there is enough meat, to tap a 3/4 pipe thread. I think in a couple days, Ill have my other half ton back in service, and I can pull this nipple out, and take a look.

The substanse the previous owner used, looks like liquid solder, or has the alum like appearance, and is hardened.

Aluminum expands three times as much as steel, with like heat, so I'd think something thats softer, or gives a lil, would have been better. Teflon tape like previously mentioned sounds good too. thanks everyone



 
rockfangd 
"5th Year" Gold Supporting Member
Posts: 2437
rockfangd
Age: 32
Loc: Utica ny
Reg: 04-13-10
12-08-17 07:09 PM - Post#2717352    
    In response to weld123

Be careful as the intake may be cracked there.
It can happen if it is over stressed from being overtight or threaded wrong.
you did say it was already converted from a quick connect to a barbed nipple right?

Old School GM fan FOREVER


 
weld123 
Contributor
Posts: 160

Reg: 10-20-07
12-09-17 09:33 AM - Post#2717392    
    In response to rockfangd

yes, thanks



 
weld123 
Contributor
Posts: 160

Reg: 10-20-07
12-10-17 01:58 PM - Post#2717496    
    In response to weld123

Happy ending here. Ipulled it out, no internal thread damage.

The nipples threads were undersized, w/o much taper, as I couldnt get it to seal.

I bought a 3" pipe nipple, stuck it in there w/ some permatex 2, and its good. thanks



 
rockfangd 
"5th Year" Gold Supporting Member
Posts: 2437
rockfangd
Age: 32
Loc: Utica ny
Reg: 04-13-10
12-10-17 09:22 PM - Post#2717528    
    In response to weld123

Cool. Very lucky

Old School GM fan FOREVER


 
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