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Hello, I am rebuilding my 1977 Jeep CJ7 inline 6 4.2L. I am stuck on finding this part as shown in the picture.  The radiator hose hooks up to the engine block here and I can't seem to find the part that screws into this. It's small, I got a 3/8" connector, still to big, my radiator hose is 5/8". I bought this part from Summit (Fitting, Adapter, NPT to Hose Barb, 45 Degree, Stainless Steel, Natural, 3/8 in. NPT, 5/8 in. Hose Barb,)  see pic below.    I have tried everything to find this part and until then my build is at a standstill, please help.

Thank you

Simon

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summit.jpg

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Simon...Your photos and explanation are helpful.  From what I see, there's good news.  The cast fitting is part of the water pump.  There should be no threads inside this water pump "fitting" or nipple.  The heater hose fits directly over this casting nipple.  There is no fitting required.

I verified in the FSM for your Jeep model that the heater hose fits directly over this nipple.  If you measure the nipple stem casting (below the neck), you will discover that the outside diameter of the nipple is close to the inside diameter of the heater hose that goes from the heater pipe at the firewall to the water pump.

This is the return hose from the heater.  The hose inside diameter/size can be smaller on this return hose than the hose size from the thermostat housing to the heater.  Pay attention to the hose nipple and heater pipe sizes.

When I install these heater hoses, I swab a light coating of Gasgacinch on the I.D. of the hose end or around the nipple.  (In the day, I used a film of Permatex High Tack or Super 300D, which works fine.)  This adds to the sealing ability at this casting nipple or bib, which if iron is usually not smooth.  Do not apply too much sealant.  Excess will find its way to the radiator core/tubes.

Please confirm your findings...

Moses

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  • Moses Ludel changed the title to 1977 Jeep CJ Heater Hose Hook-up

There are threads inside of this, I screwed in a bolt to try and figure out the size, but from what I am hearing from you, I don't need a fitting to connect the hose.  All I need to do is place the hose over the cast fitting, seal it and clamp it for security? If so this is great news.  Thank you for your help.

 

Simon

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Yes, Simon, that should do it for the late seventies style water pump.  The factory service manual for your era shows the heater hose attaching directly to the water pump's integral nipple or bib.  Take measurements.  Measure the stem/shank of the nipple to confirm the hose I.D. size.  This should match with the heater return pipe O.D. at the firewall.

The thread on the water pump nipple could serve as a block-off if the vehicle does not have a heater.  If a pipe thread, it would be tapered, most likely a 1/4-inch NPT pipe thread size.

In the early eighties, AMC/Jeep 4.2L parts catalogs show a water pump design that does require a threaded heater hose fitting.  In my Mopar parts catalog for 1981, there is a water pump that takes a threaded nipple (part #36 in this illustration below).  The fitting used with this later water pump is factory/Mopar number:  

P/N 32002591 NIPPLE

image.png

If your engine had this later style water pump, you would need a threaded nipple (Mopar 32002591 or equivalent).   That water pump casting thread is likely 3/8" NPT or larger.  The thread size you have on your pump is smaller than this.  Your pump does not use a separate fitting for the hose.  Instead, the hose attaches directly to the pump casting nipple.

Moses

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Your information is fantastic, if I come across any other hang ups I will definitely be hitting you up again.  Thanks for the support, I can't wait to finish the jeep up and get back on the road.  I'll send pictures when I'm done.  Some pictures for now

Thank you again 

Simon 

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11 minutes ago, Moses Ludel said:

Simon, you're building a nice Jeep CJ-7!  Keep up the detailed work on that engine...Let us know how the hose fitting issue works out.

Moses

I picked up a 1/4 threaded nipple and is to big. If I put on a smaller one would it cause not enough liquid to flow ? Is it possible to speak with you over the phone? You are fantastic 

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pwbulldog (Simon)...The Mopar P/N 32002591 has been discontinued.  I dug even further into aftermarket water pumps.  Crown Automotive is a good barometer.  All of the cast iron aftermarket water pumps for mid-seventies to 1990 AMC/Jeep 4.2L engines have a nipple cast into the water pump housing for the return heater hose.  They do not use a fitting.

In your latest close-up view of the water pump nipple (cast into the pump), it looks like the hose does fit directly onto the pump.  Will the 5/8" hose fit over the casting nipple?  If the hose fits properly, follow my original suggestions.  Ignore the pipe thread, it's an option for those who need to block off this port.

Yes, 1/4-inch NPT already restricts flow.  Anything smaller would not work.  Your water pump obviously does not require a fitting. 

Below is a typical Crown aftermarket cast iron replacement pump for 1975 up 4.2L engines.  The pump has a cast-in hose nipple like your pump.  If there is a thread, it's strictly for an NPT pipe plug for use when there is a need to block off the port:

1977 Jeep 4.2L Water Pump.jpg

In looking at heater hose connector fittings, there is no 1/4" NPT fitting for a 5/8" heater hose—for the reason you cite.  There would be inadequate flow.  This is confirmation that your pump accepts the return hose without a fitting.

Moses

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pwbulldog...I hunted the internet until these late seventies CJ 4.2L water pump photos turned up.  (Photos courtesy of http://jeep.smallcraft.net/.)  There were many similar examples without this degree of clarity...Note that the heater hose attaches directly to the pump casting nipple—without the use of a fitting.  You're on the home stretch:

1976 Jeep 4.2L Water Pump (3).png 1976 Jeep 4.2L Water Pump (1).png

1976 Jeep 4.2L Water Pump (2).png

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You have been very helpful, now I got a new one. Oil Dipstick replacement, I can find the one for a V8 but no luck for the V6. Would you happen to know who might carry one that I can purchase?

Simon

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Simon...Like you discovered, everyone has the 304/401 V-8 dipstick tube and oil level stick for your era Jeep.  I searched and found nothing for the 4.2L inline six.   

My OEM part numbers go back to 1981.  For 1981-82 Jeep models, I found the 4.2L dipstick and tube.  (The change year appears as 1983.) Here are those Mopar part numbers:

TUBE, Engine Oil Indicator
J3176846 1981-82

INDICATOR, Engine Oil Level
J3237515 1981-82

I dug further, and Crown Automotive offers the tube, which is available at Quadratec.  This tube is backward compatible to your model:

https://www.quadratec.com/p/crown-automotive/engine-oil-dipstick-tube-jeep-cj-sj-and-j-series-6-cylinder-engine

Try contacting Crown or Quadratec about a matching dipstick for this tube...The oil level stick should be the same part as the Mopar J3237515.

Moses

 

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4 hours ago, Moses Ludel said:

Simon...Like you discovered, everyone has the 304/401 V-8 dipstick tube and oil level stick for your era Jeep.  I searched and found nothing for the 4.2L inline six.   

My OEM part numbers go back to 1981.  For 1981-82 Jeep models, I found the 4.2L dipstick and tube.  (The change year appears as 1983.) Here are those Mopar part numbers:

TUBE, Engine Oil Indicator
J3176846 1981-82

INDICATOR, Engine Oil Level
J3237515 1981-82

I dug further, and Crown Automotive offers the tube, which is available at Quadratec.  This tube is backward compatible to your model:

https://www.quadratec.com/p/crown-automotive/engine-oil-dipstick-tube-jeep-cj-sj-and-j-series-6-cylinder-engine

Try contacting Crown or Quadratec about a matching dipstick for this tube...The oil level stick should be the same part as the Mopar J3237515.

Moses

 

 

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I'm back with another question, I should have marked what part this was but didn't and we can't figure out what or where it belongs to.  I hopefully you can tell us. Please see pictures.

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I have no illustrations from the pre-1981 parts manuals.  Your components do not resemble frame members or engine/transmission support brackets.  A late seventies (1976-79) factory parts schematic for the body and attachments would be helpful. 

This is the 1981 Mopar catalog/factory body tub and dash layout.  Though not your model, this may be insightful:

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Moses

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Well, pwbulldog, that does account for a part that resembles #1 in the 1981 Mopar Parts illustration below.  Though not your 1977 model, the bracket for a column shift steering column is similar.  Sounds like you nailed it.  The other piece fits there too?

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