capping off heater hoses

Small Block Mopar Engine

  1. martin53

    martin53 martin53

    Messages:
    133
    Likes Received:
    0
    Joined:
    Aug 8, 2012
    Location:
    portales
    Local Time:
    1:33 AM
    I have a 1973 318 and was wondering how do I cap off the heater lines from the engine. Ones on the intake manifold and the other is on the water pump.
     
  2. jomoper

    jomoper Mope or Nope

    Messages:
    3,216
    Likes Received:
    158
    Joined:
    Aug 18, 2006
    Location:
    NorCal.S.F.bay area
    Local Time:
    11:33 PM
    Best way is with a threaded plug but installing one in the aluminum water pump is nearly impossible without cracking it . Don't trust those rubber boots that plug the end and are held on with a hose clamp for anything more than a temporary fix. There are water pumps available that have a threaded bore for the heater hose nipple so they are easy to plug off but they're quit a bit more than a stock replacement w/p . I believe they're made by edelbrock.
     
  3. memike

    memike Super Moderator Staff Member FABO Gold Member

    Messages:
    50,815
    Likes Received:
    8654
    Joined:
    Jan 8, 2006
    Location:
    on the hill
    Local Time:
    1:33 AM
    I have dun this and just looped the two lines together, I am sure a Good experienced Tech will chime in soon enough, I was concerned about flow of coolant being stopped to go some where ells, so that is what I did.
     
  4. WRB426

    WRB426 Insane 4 Mopars FABO Gold Member

    Messages:
    2,237
    Likes Received:
    173
    Joined:
    Apr 20, 2011
    Location:
    MA
    Local Time:
    2:33 AM
    I have a plug for the intake. And a rubber plug for water pump. But as mentioned before they suck. They dry out quick and leak. Tapping for plug is tricky. Not a lot of meat in the pump.
     
  5. TrailBeast

    TrailBeast Slightly Twisted Member

    Messages:
    19,224
    Likes Received:
    5567
    Joined:
    Mar 11, 2011
    Location:
    Arizona
    Local Time:
    12:33 AM
    Whatever you do, don't put those rubber caps on them, because they will leave you stranded and overheating in a week.

    Cap them with threaded plugs and use teflon tape on the threads.
    This is absolutely the best way.
     
  6. martin53

    martin53 martin53

    Messages:
    133
    Likes Received:
    0
    Joined:
    Aug 8, 2012
    Location:
    portales
    Local Time:
    1:33 AM
    How would I cap the one on the water pump it has no theads
     
  7. jomoper

    jomoper Mope or Nope

    Messages:
    3,216
    Likes Received:
    158
    Joined:
    Aug 18, 2006
    Location:
    NorCal.S.F.bay area
    Local Time:
    11:33 PM
    You'll have to tap it - cut threads. I wouldn't attempt it with he water pump installed. I did one years ago and wound up fracturing off the nipple for the heater hose. I cut it off flush and cut the threads for the plug in the body of the water pump.
     
  8. Hersbird

    Hersbird Well-Known Member

    Messages:
    952
    Likes Received:
    22
    Joined:
    Feb 20, 2010
    Location:
    Missoula, MT
    Local Time:
    12:33 AM
    If it's just for summer because you want to keep heat out of the heater, then just make a shorter loop and bypass the core.
     
  9. 805moparkid

    805moparkid SS And AFX Worker Bee

    Messages:
    11,547
    Likes Received:
    69
    Joined:
    Oct 29, 2008
    Location:
    Phoenix Az
    Local Time:
    12:33 AM
    im watching this as i need caps for the slant pump... maybe drain out the coolant and clean the nipples, then epoxy the holes up or tig a cap on them?
     
  10. bighammer

    bighammer Well-Known Member

    Messages:
    2,440
    Likes Received:
    115
    Joined:
    Dec 17, 2012
    Location:
    Northwest Oregon
    Local Time:
    11:33 PM
    Just loop em together
     
  11. martin53

    martin53 martin53

    Messages:
    133
    Likes Received:
    0
    Joined:
    Aug 8, 2012
    Location:
    portales
    Local Time:
    1:33 AM
    Thanks a lot guys.
     
  12. bad440

    bad440 everything,all the time..

    Messages:
    3,795
    Likes Received:
    55
    Joined:
    Mar 27, 2010
    Location:
    oakland ca
    Local Time:
    1:33 AM
    thats what idid on the pump.View attachment Img_00687.jpg actually stuck an allen bolt that fit tight in the nipple then epoxyed it from the inside...
     
  13. coffeedart67

    coffeedart67 Well-Known Member

    Messages:
    1,165
    Likes Received:
    28
    Joined:
    May 9, 2010
    Location:
    Southeast South Dakota
    Local Time:
    1:33 AM
    I took a short piece of heater hose(2-3 inchs) , clamped to the fitting then stuck a unilug lug nut (for 1/2 studs)in the other end of the heater hose and put a hose clamp on that. Ran the car like that for 2 years, never had a problem.
     
  14. UOP

    UOP Well-Known Member

    Messages:
    760
    Likes Received:
    9
    Joined:
    Oct 29, 2009
    Location:
    Plano, Texas
    Local Time:
    1:33 AM
    I ran the rubber plug for 2 years and I replaced the plug at least 5 times. You can find the plugs in an assortment package in the "Help" section at Autozone, and the package comes with 2 in that size. Keep the other in the glove box with a clamp for a spare.

    Over the winter I tried tapping the water pump for a plug and cracked it so I had to buy another. I got it on the 2nd try but I was nervous. As mentioned before there isn't much meat to it.
     
  15. fishy68

    fishy68 Tyr Fryr's Inc. FABO Gold Member

    Messages:
    16,783
    Likes Received:
    729
    Joined:
    Jan 11, 2005
    Location:
    Central, IL (Hooterville)
    Local Time:
    1:33 AM
    I've tapped several pumps to accept a 1/4" pipe plug but you gotta go slow and easy. Tap too fast and the aluminum will ball up and split the nipple. You also need to do it with the pump removed of shavings will drop down in it. After I install the pipe plug (use some pipe sealer on it) I slip one of the rubber plugs over it to clean it up. That's all those plugs are good for. Too thin to last under pressure.
     
  16. seabee

    seabee Well-Known Member

    Messages:
    2,427
    Likes Received:
    557
    Joined:
    Dec 20, 2009
    Location:
    Bonita, CA
    Local Time:
    11:33 PM
    [​IMG]
    [​IMG]
     
  17. sickandwrongcustoms

    sickandwrongcustoms Well-Known Member

    Messages:
    182
    Likes Received:
    0
    Joined:
    Jan 12, 2011
    Location:
    sprucepine north carolina
    Local Time:
    2:33 AM
    loop it!!!!!
     
  18. 1973dusterkid

    1973dusterkid Watch This

    Messages:
    2,248
    Likes Received:
    28
    Joined:
    Jul 17, 2011
    Location:
    Buford Georgia
    Local Time:
    2:33 AM
    2 vise grips and 2 grease rags
     
  1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.