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Bazross

Member
HI guys I know this has been done to death but mine is a strange one and I can't find any info on it.
OK, Td5 on the facelift 03 plate high miles 200k+
Oil level started to rise so I changed the seals on the injectors with the £35 set of seals which seemed to cure it for about 800 miles then it started to rise again so I changed them again for the £3.50 set again it seemed to stop it but after a few hundred miles same as.
So off came the cover and out came the injectors and I sprayed the injector housing with crack penatrant spray however nothing to show and could see no cracks.
So after new seals cheapo set it has run a week and not gone up on the oil until yesterday the wife was towing the horse and it has now started to climb again.
So I've just had the cover off again and put 6 bar of air pressure down the fuel supply line to the head and watched around the injectors for signs of any diesel bubbling but nowt showed up.
It starts on the button no smoke no power issue runs and ticks over fine.
So how can I tell if it's the head, injectors or seals could it be the fuel pump is blowing the seals by over pressure? any way forward or advice would be great guys.
Tia regards Baz


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Yeah I've don't that three times each time it seems to cure it only for it to fail later
My thinking if it was head it would leak constant and not stop but what is causing the seals to fail
 
Are you sure it is stopping for a short time when you change the seals? if so then if it was the head changing the seals would not stop it even for a short time?
Not a expert for this so might be talking ****,(someone will be along to tell you soon) Normally on a diesel with is problem the diesel leaks down into cylinders, as the injectors on a td5 are under rocker cover the oil is leaking into top of engine, if there is any wear on the outside of injector they will seal to head so nothing leaks into cylinder but after a small amount of time / miles the diesel starts to leak into rocker, If you could borrow some, injectors and it did not do it with them then the problem is on the sides of injectors, most likely just one, if it is where it seats may be it can be tided up some how?
 
A crack in the injector socket on injector 1 is fairly common, but you would normally see fuel bubbling up there.

The injector sockets can also become slightly oval if the injectors aren’t clamped in properly, less common.

Normally the seals get damaged when they are installed. The thicknesses of the o rings seems to vary with manufacturers.

If you watch the area with the rocker cover off and the fuel purge sequence running you should see where it’s leaking.
 
tom1979 said:
A crack in the injector socket on injector 1 is fairly common, but you would normally see fuel bubbling up there.

The injector sockets can also become slightly oval if the injectors aren’t clamped in properly, less common.

Normally the seals get damaged when they are installed. The thicknesses of the o rings seems to vary with manufacturers.

If you watch the area with the rocker cover off and the fuel purge sequence running you should see where it’s leaking.
Click to expand...
Yep tried that today and went through two purges and nothing coming out so fires compressed air into the fuel rail and that showed nothing either the only thing I can think of is the injectors themselves leaking through the tops if that's possible
So I run it with no cover and the only place I could see anything was on the injector push rod
 
I had similar problem with mine. Changed seals and washers twice. Didn't cure the problem. Diesel filling sump at an increasing rate until one day the engine blew up.
Piston up.jpeg


I can't be certain this damage was caused by oil thinned down by diesel but it would be a big coincidence otherwise. Is it even possible that the piston ring had lost compression ( before it totally went ) causing the cylinder not to fire and letting unburnt diesel go past the ring to the sump?
 
brianconwy said:
I had similar problem with mine. Changed seals and washers twice. Didn't cure the problem. Diesel filling sump at an increasing rate until one day the engine blew up.
View attachment 189150

I can't be certain this damage was caused by oil thinned down by diesel but it would be a big coincidence otherwise. Is it even possible that the piston ring had lost compression ( before it totally went ) causing the cylinder not to fire and letting unburnt diesel go past the ring to the sump?
Click to expand...
OK I'd had better do a compression test then I'll see if I can get hold of a tester
 
Yeah I was clutching at straws but it seems as crappy landrover **** poor engineering strikes again.
Along the same lines as the leaking sunroof.
Still it keeps my hands busy and my wallet empty
If landrover made cups
IMG-20190316-WA0002.jpg
 
The current values of discos is just about a bit higher than the price of an AMC head. Weird that it would certainly be worth it on a defender from purely financial reasons but not on a disco.
 
OK guys you were all correct I removed the head this week and after buying a second hand head and getting ripped off on the well known auction site
I fitted another and I'm waiting to see the results of the repair.
So the old head has indeed cracked on no1 injector socket a very fine crack
There is a guy online that offers a repair of the crack and seems to have a very good feedback for doing it however I get various answers on repair depending who you speak to so I'm throwing it out there for you guys.
Has anyone on here had the repair done did it last was it good or a load of tosh and failed below is the crack please any comments will be appreciated
 

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Bazross said:
That's is very interesting
The post doesn't follow up on the repair but it's interesting in the fact the crack is caused by only turning the injector off by one turn which is what it says in rave
So what is the correct setting of the injectors
Click to expand...

I haven’t read that post, but if it was caused by only turning the adjuster back one turn it then why is it always No.1 that goes?
 
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