Diesel compression test

[daman]

The other compression thread got me thinking,now I'm no stranger to this test on a gasser have done it many times anyway wanting to run this test on my 4500 201 3 cyl just to see the condition of it, no problems it starts just fine my question is,,,wile running the test on a diesel engine and doing one cylinder do you remove the other two injectors OR leave them in or it doesn't matter?

 

[Bern]

Remove all 3. Allow 6-8 puffs per cylinder. 350 PSI minimum.

 

[LPgas only]

I would always take them out first. It could affect your reading on the others if you have a bad cyl otherwie.
G.

 

[daman]

OK so remove all 3 injectors then do the test one by one????

just curious why is that??

 

[Bern]

Makes it easier to crank. On a 6 cylinder engine, the battery would be half worn down by the time you got to the last one, which would affect the readings.

 

[daman]

Right,but maybe not as important on a 3 cyl with a charger attached,but anyway yea noted and will remove all 3 before i test,thanks..

 

[john_Bud]

(quoted from post at 11:43:32 01/19/12) OK so remove all 3 injectors then do the test one by one????

just curious why is that??

It also protects you in case you left the fuel on and it started.

 

[Texasmark1]

When you said it starts just fine you just answered your question
without having to perform the test. I bought a 3000 once and it
was a balmy day in the spring. The sales guy had to use ether to
get it to light off.

My education cost roughly $1700 when you figure new batteries
and starting wires, then a new 5" starter (had a 4), and finally bit
the bullet and did an inframe.....starts just fine now with no ether.

Mark

 

[daman]

(quoted from post at 15:51:30 01/20/12) When you said it starts just fine you just answered your question
without having to perform the test. I bought a 3000 once and it
was a balmy day in the spring. The sales guy had to use ether to
get it to light off.

My education cost roughly $1700 when you figure new batteries
and starting wires, then a new 5" starter (had a 4), and finally bit
the bullet and did an inframe.....starts just fine now with no ether.

Mark

I knew it was a healthy engine when i bought her it starts fine in cool weather and good with thermo start in the cold weather but I'm just curious to see what it actually is.