Would this crack have been enough to fill the sump with diesel?

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brianconwy

Well-Known Member
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Location
conwy, north wales
I have tested the No. 1 injector pocket for cracks on the original cylinder head that had been removed. This small crack showed. Is it big enough to have caused quite a lot of diesel to escape into the rocker shaft area? Thanks.
Crack.jpeg
 
I never looked as the engine was curtains. There was loads in the sump and I had already changed washers and seals. The rest of the engine has gone for scrap.
 
Very probably. It's at 60psi in the fuel gallery, so a lot can get out. Diesel is a bit like brake fluid - it's good at flowing through tiny gaps. Even more so when it is warm.

That doesn't mean there are no failures anywhere else of course.
 
I am going to take a chance and assume this was the problem and use the original injectors on the engine I have bought as it didn't come with injectors. Thanks.
 
brianconwy said:
I am going to take a chance and assume this was the problem and use the original injectors on the engine I have bought as it didn't come with injectors. Thanks.
Click to expand...

Yes, despite the high pressures involved and the fact that they're rattled up and down 30 or 40 times a second when the engine's running, the injectors last surprisingly well. They're not made by Land Rover!
 
Yes, that crack is absolutely enough to fill the sump.
You can work it out roughly, assume it "drips" once per second, its actually a weep, it takes roughly 20 drips to make a 1 m/l, so that's 3 m/l a minute, x 60 mins = 180 m/l hour.
So very roughly in 33 hours running, you will fill the sump with 6 litres of fuel.
I think the actual flow could be a lot higher, I was checking my oil level daily and mine shot up in less than 6 hours running.
 
My sump was filling fast before number one cylinder went. Perhaps the thinned down oil had something to do with that. The old engine block and cylinder head ( in the picture ), have gone but I am using the injector. Thanks for the feedback, it is reassuring.
 
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