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#1101318 - 05/20/16 11:02 PM Re: Mystery Coolant Leak.... [Re: pcc]  
pcc  Offline
Body Damage is Cool
Joined: Mar 2005
Posts: 1,006
South East U.S.A.
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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#1101321 - 05/21/16 10:34 AM Re: Mystery Coolant Leak.... [Re: fasteddy]  
cheesegrater  Offline
Wheeler
Joined: Dec 2006
Posts: 134
Franklin IN
The intake manifold and head are bolted together with a gasket in between. Coolant runs through there. A leak can develop at that connection.


#1101322 - 05/21/16 03:14 PM Re: Mystery Coolant Leak.... [Re: cheesegrater]  
pcc  Offline
Body Damage is Cool
Joined: Mar 2005
Posts: 1,006
South East U.S.A.
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

#1101323 - 05/21/16 08:06 PM Re: Mystery Coolant Leak.... [Re: cheesegrater]  
pcc  Offline
Body Damage is Cool
Joined: Mar 2005
Posts: 1,006
South East U.S.A.
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

#1101328 - 05/22/16 05:19 PM Re: Mystery Coolant Leak.... [Re: pcc]  
BottomFeeder  Offline
Body Damage is Cool
Joined: Oct 2002
Posts: 1,604
OKC, OK
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

#1101329 - 05/22/16 08:08 PM Re: Mystery Coolant Leak.... [Re: pcc]  
pcc  Offline
Body Damage is Cool
Joined: Mar 2005
Posts: 1,006
South East U.S.A.
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

#1101334 - 05/23/16 01:17 PM Re: Mystery Coolant Leak.... [Re: Dylan]  
Dylan  Offline

Mudrunner
Joined: Dec 2009
Posts: 305
Peoria, AZ
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....

#1101335 - 05/23/16 03:45 PM Re: Mystery Coolant Leak.... [Re: Dylan]  
fasteddy  Offline
Web Wheeler
Joined: Jan 2001
Posts: 13,649
Helen , GA *****
Radiator pressure test. It pressurizes the whole cooling system...


Not responsible for advice not taken...

#1101336 - 05/23/16 07:42 PM Re: Mystery Coolant Leak.... [Re: fasteddy]  
pcc  Offline
Body Damage is Cool
Joined: Mar 2005
Posts: 1,006
South East U.S.A.
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

#1101338 - 05/24/16 01:47 AM Re: Mystery Coolant Leak.... [Re: fasteddy]  
Dylan  Offline

Mudrunner
Joined: Dec 2009
Posts: 305
Peoria, AZ
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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