300 Tdi coolant leak - Defender Source
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  #1  
Old February 10th, 2008, 09:42 PM
cdb
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Clark Bowen
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300 Tdi coolant leak

Finally got the D90 back with a new head gasket and air conditioning installed.
After it sat for the night I noticed a coolant puddle and after I started it up I could see that it was dripping along the driver's side (it's an NAS) of the motor between the oil pan and the block. A drip every few seconds and while it ran along the gasketing material between the pan and the blosed that way until the motor gets cold - many hours.
I didn't think there were any coolant channels down there and all I could think of was a cracked block.
Any ideas?

Clark
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  #2  
Old February 10th, 2008, 10:35 PM
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I am willing to bet that the leak is coming out of the water pump further up and you have only noticed it down below. I had the exact same thing happen to mine. Only leaked when it was warm at first. Then got worse, and finally had to be fixed. It is the seal behind your water pump. The good news is, it's not "that" bad and can be done yourself. New bolts and a gasket is like $30 or so if I am remembering right.
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  #3  
Old February 10th, 2008, 11:19 PM
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Clark Bowen
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Thanks Buck.

I initially thought that might be the issue, but couldn't see any drip trails down the block. I'll have another look since the just removed and then replaced the waterpump when they found it was ok. They were looking for my coolant overflowing - it was a head gasket.

Clark
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  #4  
Old February 11th, 2008, 12:02 AM
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I also had a couple hoses leaking until they got good and seated. On the large inlet hose by the alternator I had to get a heavier clamp to get it tight enough, a little hose clamp wasnt doing it. It was weeping through at the bottom and running down stuff, hard to see, but all the while making a mess.
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  #5  
Old February 11th, 2008, 06:27 AM
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Try the "P" gasket between the casting that holds the PAS pump, the alternator, and the water pump. It will leak onto the front of the oil pan on the drivers side. It's a little tricky to see where it's coming from but is a common leak.
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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 February 11th, 2008, 06:51 AM
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Quote:
Originally Posted by junkyddog11
Try the "P" gasket (...)It's a little tricky to see where it's coming from but is a common leak
Does it look like this?
It started last week.
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  #7  
Old February 11th, 2008, 08:49 AM
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Quote:
Originally Posted by Cube II
Does it look like this?
It started last week.
Yep, thats the one.
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  #8  
Old February 11th, 2008, 09:09 AM
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Clark Bowen
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That's the right spot. I think Matt's pictures show the culprit, but I'll re-check all the hose connections.
It is surprising how coolant can run down the motor and not leave a trail but stay on the garage flooor - unevaporated - for days, weeks, ??
Clark
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  #9  
Old February 11th, 2008, 10:59 AM
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It's surprising how it started to leak...suddenly!
I checked the coolant level and it's already a good inch less!
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  #10  
Old February 11th, 2008, 06:25 PM
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Not to worry as it isn't a bad fix at all. You don't actually even have to take the water pump off (although now would be a really good time to replace it if at all questionable).

This is the bit that needs to be removed
...holds the alternator and the PAS pump, as well as the belt tensioner.
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.

"Dedicated to the resurrection of junk through engineering?"
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  #11  
Old February 11th, 2008, 09:09 PM
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Clark Bowen
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Thanks Matt....

Oddly, it has stopped leaking even after sitting overnight. Crossing my fingers, but if it comes back I'll pull that piece.
I do wonder why LR has so many head gaskets go bad around 70,000 miles. I've had three or four go in various RR V8s and one in a D90 V8. Maybe the same design team that handles oil seals does the work.

Clark
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  #12  
Old February 13th, 2008, 05:10 AM
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Assuming you have a LHD, on the drivers side of the block you also have 3 core-plugs and a coolant drain plug. The rear core-plug blew on my 300tdi, was fixed by the main dealer and then began leaking again about six months later. The plug had not been installed square.

Could be worth checking, as if the core-plug blows you basically dump all your coolant in seconds and a warped head is nigh guaranteed...

Mark
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  #13  
Old February 13th, 2008, 09:58 AM
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Clark Bowen
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Thanks Mark...

I'll give it a look.
Oman, now that sounds like an interesting place to have a LR.

Clark
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  #14  
Old February 13th, 2008, 11:02 AM
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Quote:
Originally Posted by cdb
Thanks Mark...

I'll give it a look.
Oman, now that sounds like an interesting place to have a LR.

Clark
Only if 1700km of coastline, plus mountains and desert rings your bell...
Been here 16 years and can't seem to drag myself away. Knocks the UAE into a cocked hat (Flame on!)
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