Boom, Smoke and head scratching - Defender Source
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  #1  
Old June 26th, 2013, 02:39 PM
Rover110
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Steve
1993 Defender 110 NAS #472
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Boom, Smoke and head scratching

Was stuck in traffic today for about an hour. 90 degrees or so. As I finally got to my exit there was a loud boom and truck immediately filled with grayish whit smoke.
I hit the flashers, popped hood and grabbed fire extinguisher.
Tons of smoke, no flames thankfully.
Smoke cleared. Some liquid on the ground but nothing catastrophic.
I rolled off the road and checked things out. The fluid seems to be anti-freeze. All of it was on the bottom right of truck. Top end was dry. Checked hoses. Fine.
Played it safe and got a tow to mechanic.
Can't find anything wrong. Pressure tested system. Solid.
Drove 10 miles around the area. Nothing.

Anyone of you folks have any ideas with what I gave you? I'd rather there was a blown hose then I'd at least know what to fix. This is crazy confusing, for me at least.

Steve
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  #2  
Old June 26th, 2013, 02:41 PM
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Craig
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A way to check it would be to have your mechanic start it up, let it sit (don't drive) with A/C on...and monitor temp gauge...ie reproduce what caused issue.

Def an issue if you lost coolant.
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  #3  
Old June 26th, 2013, 02:44 PM
Rover110
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Steve
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Thanks. Forgot to mention. No ac. Can't find a new switch.
Fixing ac is next on list

Quote:
Originally Posted by Jonesy View Post
A way to check it would be to have your mechanic start it up, let it sit (don't drive) with A/C on...and monitor temp gauge...ie reproduce what caused issue.

Def an issue if you lost coolant.
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  #4  
Old June 26th, 2013, 04:36 PM
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Danny
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Once my expansion tank split on the seam, but somehow when it cooled it didn't leak again for a few days and being on the seam the crack was nearly invisible. I did what Craig said above, try to get it to happen again and I'd pay extra attention to the expansion tank. Good luck.
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  #5  
Old June 26th, 2013, 05:33 PM
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Marc-Andre Leger
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This sort of thing seems to happen to me when the engine gets too hot... no big problem for me, just let it cool and add coolant fluid. If you need a new expansion tank, consider these: http://www.allisport.com/
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  #6  
Old June 26th, 2013, 06:05 PM
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Steve
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Thanks for the help All. I will try and re-create.
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  #7  
Old June 26th, 2013, 07:36 PM
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Wouldnt a leak in the expansion tank reveal itself under a pressure test?
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  #8  
Old June 26th, 2013, 07:43 PM
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I have never seen a metal expansion tank fail. Plastic ones all the time. I am guessing it got to hot and boiled over or the cap failed.
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  #9  
Old June 28th, 2013, 07:45 AM
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Steve
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What I can't figure out is why my new gauge didn't register the excessive heat and why the system came up solid under pressure test.....
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  #10  
Old June 28th, 2013, 08:06 AM
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Jason England
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Quote:
Originally Posted by Rover110 View Post
What I can't figure out is why my new gauge didn't register the excessive heat and why the system came up solid under pressure test.....
110's had a device to smooth temp readings ... Basically the device shows a normal temp at all time. LR were criticized by early owners when over heating was not shown on the gauge.

Not sure if you still have the device but worth checking.
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  #11  
Old June 28th, 2013, 08:08 AM
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Steve
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A lesson learned? Is there any way to make the gauge read accurate?
What "device" do you mean?
Thanks

Quote:
Originally Posted by leastonce View Post
110's had a device to smooth temp readings ... Basically the device shows a normal temp at all time. LR were criticized by early owners when over heating was not shown on the gauge.

Not sure if you still have the device but worth checking.
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  #12  
Old June 28th, 2013, 08:28 AM
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mark kellgren
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this may be a faulty pressure cap. you would never figure it out with pressure test because cap is removed for that test. your cap prob failed to release pressure at normal 16psi and so pressure kept climbing. you wouldnt hear boom at 16 psi release. I would replace tank and cap at this point. regardless, even if your cap amd tank were good, a healthy system would not overheat so figure out root cause.

there is a big and distinct difference between smoke and steam. this whole thread so far is assuming you meant steam.
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  #13  
Old June 28th, 2013, 08:33 AM
Rover110
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Steve
1993 Defender 110 NAS #472
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In hindsight it was probably steam. But smoke sounds so much more dramatic.
I'll pick up a cap and look for a tank.



Quote:
Originally Posted by Overlander View Post
this may be a faulty pressure cap. you would never figure it out with pressure test because cap is removed for that test. your cap prob failed to release pressure at normal 16psi and so pressure kept climbing. you wouldnt hear boom at 16 psi release. I would replace tank and cap at this point. regardless, even if your cap amd tank were good, a healthy system would not overheat so figure out root cause.

there is a big and distinct difference between smoke and steam. this whole thread so far is assuming you meant steam.
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  #14  
Old June 28th, 2013, 09:02 AM
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chris
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you might have another problem if pressure is building up to blow the cap .......hate to say headgasket...
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  #15  
Old June 28th, 2013, 12:00 PM
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Quote:
Originally Posted by Rover110 View Post
A lesson learned? Is there any way to make the gauge read accurate?
What "device" do you mean?
Thanks
http://www.eastcoastrover.com/signalconditioner.html

quote from ECR ''

The Signal Conditioner: (1993 NAS 110 only)
The engine temperature gauge in your 1993 NAS Defender 110 is not telling you the truth. This is important because most Rover V8s will last a good long time, unless they develop coolant or overheating issues, so you need to know your coolant temperature and keep an eye on it. Behind the dash of every NAS Defender 110 is what is called a "signal conditioner" or "stabilizer." It is Land Rover part #AMR2401.''
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  #16  
Old June 28th, 2013, 12:07 PM
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John Crouse
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This is also why many of us have changed over to the VDO temp guage and sender.
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