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brianconwy

Well-Known Member

• Nov 20, 2019

• #1

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.

 

tom1979

Well-Known Member

Full Member

• Nov 20, 2019

• #2

brianconwy said:

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.
View attachment 194601

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could you see diesel coming up from there when the rocker cover was off?

 

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brianconwy

Well-Known Member

• Nov 20, 2019

• #3

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.

 

Brown

Well-Known Member

Full Member

• Nov 22, 2019

• #4

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.

 

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brianconwy

Well-Known Member

• Nov 23, 2019

• #5

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.

 

Brown

Well-Known Member

Full Member

• Nov 23, 2019

• #6

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.

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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!

 

flat

Well-Known Member

• Nov 24, 2019

• #7

Brown said:

They're not made by Land Rover!

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And that’s why they last well

 

markomate2

Well-Known Member

• Dec 3, 2019

• #8

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.

 

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brianconwy

Well-Known Member

• Dec 3, 2019

• #9

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.