Leak off test results.. - Page 1 - Home Mechanics (2024)

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chriz1

Original PosterLeak off test results.. - Page 1 - Home Mechanics (1)

676 posts

217 months

Have i done this correct, leak off test on my combo van 1.7 cdti run engine from cold for 2 mins rev'd at 2k for 30 secs.

The results in the picture ..

Can't find a decent guide some say you run test for 5 mins doing various revs Leak off test results.. - Page 1 - Home Mechanics (4)

Sorry it's sideways!

Disco_Biscuit

837 posts

196 months

Saturday 22nd June 2019

Leak off test results.. - Page 1 - Home Mechanics (5)Leak off test results.. - Page 1 - Home Mechanics (6)

I used to work at a diesel specialist, we used to run them at idle for 3 minutes, anything over 30ml is excessive back leakage.

chriz1

Original PosterLeak off test results.. - Page 1 - Home Mechanics (7)

676 posts

217 months

Sunday 23rd June 2019

Leak off test results.. - Page 1 - Home Mechanics (8)Leak off test results.. - Page 1 - Home Mechanics (9)

Ok Thanks for that

tapkaJohnD

1,953 posts

206 months

Sunday 23rd June 2019

Leak off test results.. - Page 1 - Home Mechanics (10)Leak off test results.. - Page 1 - Home Mechanics (11)

I'm aware of a "leak down" test, pressurising a cylonder to check for ring or valve leaks.
What's a "Leak off" test?

John

Novexx

346 posts

76 months

Sunday 23rd June 2019

Leak off test results.. - Page 1 - Home Mechanics (12)Leak off test results.. - Page 1 - Home Mechanics (13)

Leak off test measures the volume of fuel being returned from the injectors via the return lines - all cylinders should be within a certain limit & any injector showing excessive (or limited) return in comparison to the others indicates a potential issue.

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Leak off test results.. - Page 1 - Home Mechanics (2024)
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