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Old 02-01-2012, 04:52 PM   #1
76hutch
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Question Strange Coolant Leak

Haven't posted very often so I'll introduce myself, my names rob and am a college student to become a diesel tech. Been lurking for a year or so since getting my first Scout reading about everything I have come across or might come across.

Well I noticed after driving home the other day that I was leaking coolant. Thought it was the lower hose since it was from that area but no luck. Took a look at fins and side of tank and it was soaked but when I topped it off there was no leak. Decided to run the engine to see if it leaked when the engine ran, nope. So figured that I was just going crazy and killed the engine. Got out and started walking inside when I noticed that it was leaking more than just a drip. It was coming from near the lower hose/corner of radiator but didn't quite see where exactly.

It is a 1976 Scout II rebuilt 345, tf727, no ac, heat not hooked up

any ideas?
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Old 02-01-2012, 05:23 PM   #2
Scoutboy74
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Default Re: Strange Coolant Leak

Hi rob. My idea is kind of a pain, but I think it will save you some fiddle-farting around if you just drain the radiator and remove it from the rig so you can give the tanks and lower hose fitting a close looksee without all the misc shizz in the way. Might not hurt to have it pressure checked by a competent radiator shop if you don't have the setup to do that yourself. Most folks don't.
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Coal Trickle - '99 Dodge Ram SLT 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500/8800# GVWR/12K# winch
Hooty - '74 SII 4x4 - 392/TF727/D20/3.73 D44's/Spartan FA/Krac-lok RA/RC 4" SUA/34x11.5 TSLs/33g Fuel/8K# winch
Lemuel - '72 1210 LWB 4x4 CS - 304/TF727/NP205/RA D60 4.10 - "Pull Lemuel, pull!"
Mongo - '71 1210 LWB 2WD - 345/TF727/RA17 D60 4.10 Krac-lok - "Mongo love candy! Duh, huh, huh!"
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Old 02-02-2012, 08:29 PM   #3
Aubrey
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Default Re: Strange Coolant Leak

Check the heater hose that connects at the top of the engine. It's kinda buried in there. If it leaks there it trickles down the front of the engine and down the lower rad hose.
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Old 02-03-2012, 08:52 AM   #4
int77345
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Default Re: Strange Coolant Leak

How about thoes pipes from the water pump to the heads? Maybe? ....
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Old 10-13-2018, 06:09 PM   #5
Bob Prohaska
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Default Re: Strange Coolant Leak

This is an old thread, but the closest I've found to my issue.

Scout in question is a '72 with v345, AT/PS/PB/AC and '74 axles.
Mileage is believe to be just shy of 200k, I'm the 3rd owner, bought
it in late 1987. Engine overhaul in about 1998, I think the radiator
was replaced at that time. Apart from keeping clean coolant in it,
no work done and no problems except the odd loose hose clamp.
Radiator looks clean and bright inside.

I noticed coolant stains scattered around on the radiator's end tanks
and decided to do a pressure test. The worst drip is about three
teaspoons in half an hour at 7 psi, from the bottom of the left end tank.

Apart from avoiding getting it hot and watching the coolant level it
seems the next step is to remove the radiator for a more thorough
inspection. I had it out back in about '88, but can't for the life of me
remember how I did it, and the shop manual seems mute on the
disassembly sequence.

It looks as if the sequence would be:

1. loosen "big nut" fan clutch.
2. loosen fan shroud
3. lift out fan and shroud together, not bashing fan into radiator.
3.5 drain coolant if I get this far
4. disconnect hoses and trans cooler
5. unbolt radiator and lift up and back, over engine and away from hood

Does this sound approximately correct, and doable single-handed? Is it
worthwhile to remove the hood?

More generally, is a 20 year old radiator worth fixing? I was rather stunned
that an OEM replacement is near $600, but aluminum units are much less.
Personally, I like brass and solder, but have my limits.....

Thanks for reading, and any guidance. I can post photos if they'd help
Email is bp@www.zefox.net

bob prohaska
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Old 10-13-2018, 06:55 PM   #6
int77345
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Default Re: Strange Coolant Leak

yes those steps look good to me.
if your careful you dont have to take off the fan, iv pulled my radiator several times with out removing the fan.

also if you slide the hood prop out of the groove on the hood, the hood will open wider and give ya more room. i find a strap or rope or something and tie it back so no one has to hold it way open for me.

is a 20 year radiator worth fixing ?? that all depends. when i was really poor i had to have my radiator fixed and in about 2 years it started leaking again. not just s drip it was a large leak then i got a junk yard radiator and that also lasted about 2 years then a large leak. so if it was me i would base that on your budget fixing it got me by but it wasn't permanent.

if you like your scout and your money is stable get a new one be it copper or aluminum you will get another 20 years out of either of those
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Old 10-14-2018, 10:08 AM   #7
Bob Prohaska
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Default Re: Strange Coolant Leak

Quote:
Originally Posted by int77345 View Post
yes those steps look good to me.
if your careful you dont have to take off the fan, iv pulled my radiator several times with out removing the fan.
If the big nut comes off easily it seems prudent to remove the fan.
My garage is a bit tight, with the fan off I'll have a lot more margin
for error pulling the radiator. I neglected to mention there's a very small
drip from the lower left water pump bolt (from the driver's perspective)
that warrants more investigation. I don't think the pump seal is leaking.
Quote:
Originally Posted by int77345 View Post

also if you slide the hood prop out of the groove on the hood, the hood will open wider and give ya more room. i find a strap or rope or something and tie it back so no one has to hold it way open for me.
I'm thinking to rig a prop from the cab roof to hold the hood forward, then
use the prop to support the radiator as it goes up. Getting the radiator
halfway out and being forced to stop for a while is a real concern.....
Quote:
Originally Posted by int77345 View Post
is a 20 year radiator worth fixing ?? that all depends.

if you like your scout and your money is stable get a new one be it copper or aluminum you will get another 20 years out of either of those
I do like the scout, and even $1k is cheap to keep a street-legal v8 4x4
running vs a new anything-else. I am a little concerned about the quality
of new parts for older vehicles; the market is shrinking, that can't help
quality control, especially for subtle things like corrosion resistance.

Right now the plan is to see if the fan will come out, if it does pull the
fan and re-do the pressure test to see what's up with the water pump.
Then inspect the radiator and decide whether to fix or replace it.

Thanks for your counsel!

bob prohaska
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Old 10-14-2018, 10:38 AM   #8
Scoutboy74
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Default Re: Strange Coolant Leak

Remember, the big nut is left hand thread and you'll need a strategic screwdriver wedge placement to prevent the shaft from spinning with your wrench force.
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Favorite hobby...Driving Salma Hayek in my Scout

Coal Trickle - '99 Dodge Ram SLT 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500/8800# GVWR/12K# winch
Hooty - '74 SII 4x4 - 392/TF727/D20/3.73 D44's/Spartan FA/Krac-lok RA/RC 4" SUA/34x11.5 TSLs/33g Fuel/8K# winch
Lemuel - '72 1210 LWB 4x4 CS - 304/TF727/NP205/RA D60 4.10 - "Pull Lemuel, pull!"
Mongo - '71 1210 LWB 2WD - 345/TF727/RA17 D60 4.10 Krac-lok - "Mongo love candy! Duh, huh, huh!"
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Old 10-14-2018, 02:33 PM   #9
Bob Prohaska
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Default Re: Strange Coolant Leak

Quote:
Originally Posted by Scoutboy74 View Post
Remember, the big nut is left hand thread and you'll need a strategic screwdriver wedge placement to prevent the shaft from spinning with your wrench force.
I understand the need acutely, but not the suggestion. Can you elaborate?
Where does the screwdriver go in?

My thought was to try pressing a lever against the slack (left) side v-belts
and hope that would provide enough friction. Any good source for a wrench
would be helpful too, I'm relying on a large pair of channelock pliers, which
is far from ideal. Something that could be tapped with a hammer would
help a great deal. A regular mechanic's 1 7/8" open-end wrench seems
excessive, a lighter stamped wrench ought to work.

The nut and hub aren't visibly rusty, so I hope it'll take no more than a
few dozen foot-pounds. I've already applied ATF/acetone mix and will
repeat over the next few days.

Thanks for posting!

bob prohaska
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Old 10-14-2018, 07:15 PM   #10
int77345
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Default Re: Strange Coolant Leak

jamb that screw driver or some sort of bar in there some where to keep the water pump from spinning got to be something to wedge it against

this video had a few ideas to

https://www.youtube.com/watch?v=k0xKWn1lz1I
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Old 10-15-2018, 07:00 AM   #11
1975IH200
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Default Re: Strange Coolant Leak

Quote:
Originally Posted by int77345 View Post
jamb that screw driver or some sort of bar in there some where to keep the water pump from spinning got to be something to wedge it against

this video had a few ideas to

https://www.youtube.com/watch?v=k0xKWn1lz1I
Re: the video methods.....all butchers have their methods. Sorry but I'm not a butcher mechanic.
In the case of the water pump in the video, and many other contemporary water pumps, I utilize the tool that is designed for that situation. That is an Adjustable Pin Spanner Wrench which holds the water pump pulley while the fan nut is loosened/tightened.

It is interesting that he is aware of the holes in the water pump pulley, yet has no clue as to what they are there for. Hint: APSW tool.

As to the IH water pump, use a strap wrench on the water pump pulley. Jamming a screwdriver or piece of pipe or whatever is "handy" into your engine compartment is asking for damage or personal injury.

Just because someone makes a video and puts it on YouTube, does not mean it is a good idea to follow their methods.

Rant off.

Good luck with your project.
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Old 10-15-2018, 07:34 PM   #12
1975IH200
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Default Re: Strange Coolant Leak

Also, a Ford wrench is very useful for the "Big Nut" fan removal task.
They come in three sizes.
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Old 10-15-2018, 07:42 PM   #13
1975IH200
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Default Re: Strange Coolant Leak

Here is my small Ford Wrench, for example.
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Old 10-16-2018, 09:26 AM   #14
Bob Prohaska
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Default Re: Strange Coolant Leak

Quote:
Originally Posted by 1975IH200 View Post


As to the IH water pump, use a strap wrench on the water pump pulley.
It looks as if a strap wrench (or equivalent) is the only choice for holding
the pulley; there are no holes or lugs I can feel that would hold it against
turning. Unfortunately I don't have a strap wrench close to that big.

The idea of a "ford wrench" for the nut might work; there's only about
3/8" between the fan blades and the nut. Whatever works will have to
be rather thin. I can buy a 48mm open-end for about $40 that looks like
it will fit. An adjustable wrench is more versatile, but also more limber.

I don't see any reason to expect the "big nut" to be extraordinarily tight;
it's not rusty, and normal rotation holds it on. Any idea what a likely
removal torque would be? I can probably rig a clamp on the dual drive
belts that will hold the pulley against whatever tension the belts can take.
Damaging a belt isn't a big deal; they're already quite old.

Thanks for reading!

bob prohaska
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Old 10-30-2018, 01:14 PM   #15
Bob Prohaska
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Default Re: Strange Coolant Leak

Quote:
Originally Posted by Bob Prohaska View Post

I don't see any reason to expect the "big nut" to be extraordinarily tight;
it's not rusty, and normal rotation holds it on.
bob prohaska
Reason or no, it wasn't rusty but still exceedingly tight. In the end I
bought a Lisle 43530 wrench for 47 mm fan clutch nuts, ground it
_very_ slightly to make a good fit and made a drift to fit an old Skil
Rotohammer. That finally got it loose. An air-powered hammer (which
is what Lisle expects one to use) would have been much better, but
having neither an air hammer nor compressor the old Skil did the job.

Thanks for reading,

bob prohaska
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