94 NAS D90 coolant leak questions - Defender Source
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  #1  
Old October 17th, 2015, 03:21 PM
slorocco
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Dan Prasada-Rao
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94 NAS D90 coolant leak questions

So... I'm busy re doing the exhaust manifolds on this thing and find a big puddle of coolant in the valley on top of the motor. The vehicle is not mine, at least not yet, belongs to my uncle. This D90 had an over heating problem for a bit till he finally had the radiator re cored. Runs fine now as operating temp goes. I did notice a coolant drip last time I drove it.

So what is the most likely culprit? I'm thinking blown head gasket right now and possibly a warped head. Are there other things I should suspect or check? I'm thinking it's not worth putting the exhaust manifolds back on till I sort this out first. Coolant in the reservoir looks clean and not contaminated with oil. The oil also looks good from what I can see.

Any help would be appreciated.
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  #2  
Old October 17th, 2015, 05:26 PM
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Charles Galpin
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It could just be the valley pan gasket, but by the time you get down to it, removing the heads isn't much more work.
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  #3  
Old October 17th, 2015, 05:37 PM
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Most likely the hose in front; a big puddle is unlikely to be the heads or the valley gasket.
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Old October 17th, 2015, 06:12 PM
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Check around the thermostat housing and the upper radiator hose. Mine leaked a little when I bought it, and is caused a pool at the back of the valley gasket. Good luck.
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Old October 17th, 2015, 07:05 PM
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Dan Prasada-Rao
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Thanks guys, I'll check the hoses and thermostat first before I start dis assembling things. I'm not really too thrilled about the prospects of doing a head gasket job. You know how that works....next thing you know you are doing a full on valve job and who knows else. This is a 94 NAS but only has around 120K miles. It needs a few other things too but not too bad overall if you can stand the camo paint job. I'm thinking of buying it to be honest. It's going to need a rear cross member at some point but in the near future I'd be more worried about the trans cross member which is badly rusted at the right side by the frame. Hoping it's not the frame as well that's rusted.
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Old October 17th, 2015, 07:39 PM
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2nd the thermostat housing, I got a new thermostat and it leaked a little, just needed some tightening down. Next, check the down hose to the thermostat may need the clamp tightened.
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  #7  
Old October 17th, 2015, 08:44 PM
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Dan Prasada-Rao
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Thanks I'll check it out tomorrow.

Charles, I obviously need to look at a diagram again. I didn't think the valley pan had anything to do with the cooling system.
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  #8  
Old October 17th, 2015, 10:25 PM
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Chris Davis
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Check the two coolant hoses that attach to the intake plenum-- they have a tendency to leak too.
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  #9  
Old October 20th, 2015, 08:47 AM
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Dan Prasada-Rao
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Looks the thermostat gasket is the problem, but I think I'll change out the hoses too while I'm at it. Thanks for the help guys.
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  #10  
Old October 20th, 2015, 08:55 AM
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Quote:
Originally Posted by slorocco View Post
Looks the thermostat gasket is the problem, but I think I'll change out the hoses too while I'm at it. Thanks for the help guys.
Nice thin bead of Right Stuff- let it set a few minutes until it *skins* over...then reassemble.

Use your littlest hands to work in that spot...

.
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  #11  
Old October 20th, 2015, 09:18 AM
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Dan Prasada-Rao
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Yeah, that's a tight spot isn't it. Is "Right Stuff" available at most local autoparts stores or what?
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  #12  
Old October 20th, 2015, 09:58 AM
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Dan Prasada-Rao
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Quote:
Originally Posted by Nomar View Post
Nice thin bead of Right Stuff- let it set a few minutes until it *skins* over...then reassemble.

Use your littlest hands to work in that spot...

.
So... you're saying no gasket just Right Stuff?
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  #13  
Old October 20th, 2015, 10:40 AM
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Keith Armstrong
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I've just used a gasket there. I can't imagine fighting with the stick on stuff the next time that thermostat needs to be replaced.

I will admit that the first time I replaced one of these, it must have taken me 15 minutes fighting with the dry gasket falling out of alignment before it occurred to me to stick it in place with a dab of grease
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Old October 20th, 2015, 10:58 AM
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Ok, I'm pretty thorough with this job....clean both sides VERY well.
Scrape, polish, etc....clean metal.
Very small bead of Right Stuff.
Squirt a little extra somewhere else to monitor while it sets.
It will take a while(10-15 maybe 20 minutes to skin over)
Keep checking your extra; then when its ready= reassemble.

It wont leak.

Quote:
Originally Posted by UnfrozenCaveman View Post
I've just used a gasket there. I can't imagine fighting with the stick on stuff the next time that thermostat needs to be replaced.
Yes, that's why you let it set a little while first.
Now, when you're doing the oil sump with Right Stuff, don't let it set up as long.
Stick it on while the stuff is still gooey. Then put the sump bolts in and tighten/torque 'em in.
After the Right Stuff sets up, you can then remove the oil sump bolts and use 'em for another project cuz it ain't comin' off and it won't leak....


.
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  #15  
Old October 20th, 2015, 11:42 AM
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Dan Prasada-Rao
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Sounds like a plan, should be able to do that tonight.
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