110 overheating or head gasket - Defender Source
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  #1  
Old January 18th, 2008, 08:55 PM
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Robert Courtney
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110 overheating or head gasket

I have a 110 with 130,000 on the 3.9. Prior to a recent trip I had the water pump replaced. I replaced the thermostat maybe 1000 miles ago. 100 miles into a 400 mile trip it starts to overheat on hills. Once on the trail I had to stop and add coolant (water after a while) every hour. I am thinking blown head gasket. I have since been home and got around to compression test. All cylinders are normal. No excessive vapor out of the exaust. No fluid on the ground. I did notice some fluid running off the blow off tube. Thoughts?
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  #2  
Old January 18th, 2008, 09:18 PM
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Sterling M Archer
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If you are lucky, it is the overflow cap (that tank on the right side) that needs to be replaced. Next, I would look at the radiator.
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  #3  
Old January 19th, 2008, 06:11 AM
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Have you checked for exhaust in the coolant?

Sometimes the head gasket will leak when more when hot and strained than when you are compression testing.

or

blocked coolant / radiator flow

or

We've had a couple of 3.9's with the dreaded slipped liner. Great compression, runs fine, coolant disapearing without a trace until it suddenly gets much worse. Doesn't happen that often to the 3.9 but it does happen.
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  #4  
Old January 19th, 2008, 08:54 AM
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Robert Courtney
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Quote:
Originally Posted by junkyddog11
Have you checked for exhaust in the coolant?

Sometimes the head gasket will leak when more when hot and strained than when you are compression testing.

or

blocked coolant / radiator flow

or

We've had a couple of 3.9's with the dreaded slipped liner. Great compression, runs fine, coolant disapearing without a trace until it suddenly gets much worse. Doesn't happen that often to the 3.9 but it does happen.
Matt, will I get a white foamy look when the radiator is low? Flow seems to be good, gauge goes up to normal, t-stat opens, pretty good heat inside.
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  #5  
Old January 20th, 2008, 06:23 AM
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not always, that would be if the oil was mixing with the coolant rather than the exhaust pressurizing the coolant.
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.

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  #6  
Old January 21st, 2008, 11:24 AM
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Robert Courtney
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Matt I took it for a run this weekend, while it didn't seem to be overheating I was blowing coolant out of the overflow. I sounds like the head gaskets for sure. Time for the 4.6.
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  #7  
Old January 21st, 2008, 01:58 PM
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Robert, my first D110 had the exact same symptoms. I installed a new over-flow tank cap. The old cap's seal was not tight enough to hold the correct amount of pressure, thus letting the coolant out. For $12.00 I would at least try that first, especially if the cap is more than 5 years old.
You also mention that the engine is over-heating. Does this mean that you swapped out the D110 signal conditioner? If not, your temp gauge would not go past 1/3, no matter how hot that thing got.
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  #8  
Old January 21st, 2008, 06:01 PM
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Robert Courtney
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Quote:
Originally Posted by Jon_Winningham
Robert, my first D110 had the exact same symptoms. I installed a new over-flow tank cap. The old cap's seal was not tight enough to hold the correct amount of pressure, thus letting the coolant out. For $12.00 I would at least try that first, especially if the cap is more than 5 years old.
You also mention that the engine is over-heating. Does this mean that you swapped out the D110 signal conditioner? If not, your temp gauge would not go past 1/3, no matter how hot that thing got.
Jon, I did remove the signal conditioner when I first got the 110. It only overheats after I loose too much coolant. I did think I would try the cap first. I even thought I would do a complete flush of the system just to rule out things.
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  #9  
Old January 21st, 2008, 07:37 PM
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Andrew Najarian
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I've probably mentioned this before, but I highly recommend doing a complete flush and refilling with BMW's blue coolant. It is quite pricey but every car I have done this to runs noticeably cooler afterwards and since these don't have the greatest cooling systems, I figure we can use all the help we can get.
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  #10  
Old January 21st, 2008, 09:54 PM
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Robert Courtney
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Thanks for the input,I'll report back.
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  #11  
Old January 22nd, 2008, 12:56 AM
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Goto Napa, by a block tester kit--about $50. You check the air at the overflow/expansion tank and it will tell you if you are pressurizing your cooling system due to a dropped liner or a blown head gasket. It will at least rule this out or not. Simple test, great tool to have on hand. Simple test.
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  #12  
Old October 15th, 2009, 08:32 PM
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Overheating????

Quote:
Originally Posted by Jon_Winningham
Robert, my first D110 had the exact same symptoms. I installed a new over-flow tank cap. The old cap's seal was not tight enough to hold the correct amount of pressure, thus letting the coolant out. For $12.00 I would at least try that first, especially if the cap is more than 5 years old.
You also mention that the engine is over-heating. Does this mean that you swapped out the D110 signal conditioner? If not, your temp gauge would not go past 1/3, no matter how hot that thing got.
What do you mean that the gauge would not go past 1/3". I have been having overheating issues and it almost taps the red? Just got back from British Pacific as a few people have said it may be the sending unit.
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  #13  
Old October 15th, 2009, 09:36 PM
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Sterling M Archer
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Do you have a 1993 NAS D110?
Only the D110s had the signal conditioner...
If you have a NAS D90, then your temp gauge is most likely telling the truth.
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  #14  
Old October 15th, 2009, 09:37 PM
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I had the same issue on my 110 and it also turned out to be the cap.
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