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Re: Mystery Coolant Leak.... [Re: pcc] #1101318 05/20/16 11:02 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
OK, I just ordered some UV dye from Amazon. I have a light and glasses from my UV dye for my A/C system.

I'll drive it some more and hope it starts to leak again.


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
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Re: Mystery Coolant Leak.... [Re: fasteddy] #1101321 05/21/16 10:34 AM
Joined: Dec 2006
Posts: 162
cheesegrater Offline
Wheeler
The intake manifold and head are bolted together with a gasket in between. Coolant runs through there. A leak can develop at that connection.

Re: Mystery Coolant Leak.... [Re: cheesegrater] #1101322 05/21/16 03:14 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
Originally Posted by cheesegrater
The intake manifold and head are bolted together with a gasket in between. Coolant runs through there. A leak can develop at that connection.


There is no indication coolant is getting into the intake. I can see the top of the intake/head connection and nothing. But since I have not identified where the leak is I can't discount anything.


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: Mystery Coolant Leak.... [Re: cheesegrater] #1101323 05/21/16 08:06 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
Originally Posted by cheesegrater
A leak can develop at that connection.


I looked at my FSM and yes it shows a coolant connection front PS as you state. So yes that could be a possibility where no coolant would get into the intake. My intake gaskets are original, I've ordered all parts for TB service including the intake gaskets.

Dye to be installed tomorrow.


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: Mystery Coolant Leak.... [Re: pcc] #1101328 05/22/16 05:19 PM
Joined: Oct 2002
Posts: 1,604
BottomFeeder Offline
Body Damage is Cool
There are some rubber coolant lines under the intake manifold and plenum. Check those as well. It will dribble down the motor and make it look like something else is leaking.



1990 Montero LS "Bottom Feeder" LWB, 33's, Cheapass Lift, 2" body lift, Dual BoUnCyS, Dual LSD's, KC's.
1995 Montero SR Complete LS interior swap and a BoUnCy from a 96 SR. General Grabber AT2's 33X12.5. 1.5" Body Lift
Re: Mystery Coolant Leak.... [Re: pcc] #1101329 05/22/16 08:08 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
I installed the dye (wear gloves), will run it this week and hope to see leak.

I can see where the lower manifold bolts to the PS head. No sign of leak there.

I ordered all the parts for the TB work as well as lower intake gaskets in case I need to replace.


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: Mystery Coolant Leak.... [Re: Dylan] #1101334 05/23/16 01:17 PM
Joined: Dec 2009
Posts: 305
D
Dylan Offline OP
Mudrunner
I appreciate all the input so far. I'm not sure who has or has not seen the images I posted, but in my case it seems like I've got a great idea of where the water is coming from. I just have no idea what it is. Up around the head gasket an inch or two higher, it's completely dry. Up under the intake, also dry. It's only wet from whatever is attached to the block right there just above the top of the bracket that holds the oil filter. Any idea what that piece of metal is and what's behind it?


'95 Montero SR 3.5L, Trail Gear Sliders, Rugged Ridge XHD Front Bumper, 33x12.5 Duratracs, much more in the works....
Re: Mystery Coolant Leak.... [Re: Dylan] #1101335 05/23/16 03:45 PM
Joined: Jan 2001
Posts: 13,649
fasteddy Offline
Web Wheeler
*****
Radiator pressure test. It pressurizes the whole cooling system...


Not responsible for advice not taken...
Re: Mystery Coolant Leak.... [Re: fasteddy] #1101336 05/23/16 07:42 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
I think with myself and Dylan is we can't see the starting point leak with all the stuff in the way. Pulling the engine front apart with water pump means we can't use pressure to activate the leak.

I'm hoping the dye will show me where.


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: Mystery Coolant Leak.... [Re: fasteddy] #1101338 05/24/16 01:47 AM
Joined: Dec 2009
Posts: 305
D
Dylan Offline OP
Mudrunner
Originally Posted by fasteddy
Radiator pressure test. It pressurizes the whole cooling system...


I get that it does... what I am saying is I can see the leak, I just don't know what is there or why it should be leaking. It leaks just by filling the radiator so I don't think putting pressure on it will be possible, much less tell me anything new...


'95 Montero SR 3.5L, Trail Gear Sliders, Rugged Ridge XHD Front Bumper, 33x12.5 Duratracs, much more in the works....
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