2000 e450 compression test results, not good
Thread Starter
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Tuned
Joined: Feb 2022
Posts: 365
Likes: 227
2000 e450 compression test results, not good
Hi everyone, got a compression test done on my bus today and well……. Not the results I was looking for….
I tested each cylinder twice. Letting the gauge puff about 5 times before I stopped cranking. The bus wouldn’t start already due to HPO issues and now I know where the compression stands….
results are as follows;
2) 300/325…… 1) 300…..
4) 325………… 3) 0……..
6) 100/125…… 5) 300….
8) 325………… 7) 0…….
How do I determine my next step? Leak down test? Put a little oil in the dead cylinders and retest? New motor?
This engine had broke down on me while driving on the freeway. I determined low ICP first, then dead head tested the HPOP and each cylinder head by itself. Found a bad injector which would leak internally. Resulting in 0 psi to the drivers side head.
I wanted to confirm engine health before diving into new injectors, but looks like I have bigger issues on my hands….. pretty demotivated, even more frustrated now….
Thanks for reading, please let me know what you think
-Chey
I tested each cylinder twice. Letting the gauge puff about 5 times before I stopped cranking. The bus wouldn’t start already due to HPO issues and now I know where the compression stands….
results are as follows;
2) 300/325…… 1) 300…..
4) 325………… 3) 0……..
6) 100/125…… 5) 300….
8) 325………… 7) 0…….
How do I determine my next step? Leak down test? Put a little oil in the dead cylinders and retest? New motor?
This engine had broke down on me while driving on the freeway. I determined low ICP first, then dead head tested the HPOP and each cylinder head by itself. Found a bad injector which would leak internally. Resulting in 0 psi to the drivers side head.
I wanted to confirm engine health before diving into new injectors, but looks like I have bigger issues on my hands….. pretty demotivated, even more frustrated now….
Thanks for reading, please let me know what you think
-Chey
Laughing Gas
Joined: Mar 2021
Posts: 1,118
Likes: 425
Did you check running compression? What tester are you using?
Have you run a blow by test (a proper one with a gauge)?
Leak down tests tend to be more reliable and tell you more than a compression test. If you can perform one it should provide a rather clear picture.
Have you run a blow by test (a proper one with a gauge)?
Leak down tests tend to be more reliable and tell you more than a compression test. If you can perform one it should provide a rather clear picture.
Thread Starter
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Tuned
Joined: Feb 2022
Posts: 365
Likes: 227
I have not done a proper blow by test either…
I believe most would agree that a leak down test is the last thing you would do before determining pulling the motor or opening it up, no?
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,111
Likes: 4,716
From: Henderson, NV
Ouch. The only time I had 0 compression was when I blew a hole in my piston. The others have got you covered. Run a leakdown on 3 and 7 to see what's up.
For the borescope, I can tell you the glowplug hole necks down from what you can see at the top of the cylinder head. My borescope with a 5mm head will not go all the way through into the cylinder.
For the borescope, I can tell you the glowplug hole necks down from what you can see at the top of the cylinder head. My borescope with a 5mm head will not go all the way through into the cylinder.
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Ouch. The only time I had 0 compression was when I blew a hole in my piston. The others have got you covered. Run a leakdown on 3 and 7 to see what's up.
For the borescope, I can tell you the glowplug hole necks down from what you can see at the top of the cylinder head. My borescope with a 5mm head will not go all the way through into the cylinder.
For the borescope, I can tell you the glowplug hole necks down from what you can see at the top of the cylinder head. My borescope with a 5mm head will not go all the way through into the cylinder.
Thread Starter
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Tuned
Joined: Feb 2022
Posts: 365
Likes: 227
Ouch. The only time I had 0 compression was when I blew a hole in my piston. The others have got you covered. Run a leakdown on 3 and 7 to see what's up.
For the borescope, I can tell you the glowplug hole necks down from what you can see at the top of the cylinder head. My borescope with a 5mm head will not go all the way through into the cylinder.
For the borescope, I can tell you the glowplug hole necks down from what you can see at the top of the cylinder head. My borescope with a 5mm head will not go all the way through into the cylinder.
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Cargo Master
Joined: Dec 2007
Posts: 2,037
Likes: 310
Have you looked at the valve train operation on those 2 supposed dead cylinders while cranking?
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