Engine/Transmission (1998.5 - 2002) Compression

[ALepley]

What is the compression value on the 5. 9L Diesel? Alldata or ShopKey doesnt list it.

 

[GW208]

16. 5 to 1 for my 01.

 

[ALepley]

im not talking about ratio im talking about the actual compression value

 

[Bob4x4]

350-450ish but the variance between cylinders is more important than a set # No more than 10 percent

 

[Tractorat]

Well, this is a stupid question. But, years ago, an experienced diesel mechanic put my truck on the computer to check some things. One of the results he got from his computer was the compression in each of the cylinders. Is that possible ? I always thought you had to hook an actual compression meter to each cylinder to get a reading.



Mike

 

[Wyomingcowboy]

Well, this is a stupid question. But, years ago, an experienced diesel mechanic put my truck on the computer to check some things. One of the results he got from his computer was the compression in each of the cylinders. Is that possible ? I always thought you had to hook an actual compression meter to each cylinder to get a reading.



Mike

I believe he was loading you. He might have been taking an educated guess - but a guess none the less. There are no sensors inside there for a computer to read to tell you compression values.

 

[Bob4x4]

You can see cylinder balance using a scanner,but it is based off rpm. Not 100 percent accurate

 

[Tractorat]

Thanks Bob,

So I guess it at least tells you something. Im guessing that, unless you suspect a compression problem, that is probably a fairly good indicator (?)

 

[Road Dog]

Well, this is a stupid question. But, years ago, an experienced diesel mechanic put my truck on the computer to check some things. One of the results he got from his computer was the compression in each of the cylinders. Is that possible ? I always thought you had to hook an actual compression meter to each cylinder to get a reading.



Mike

There's a diagnostic mode where the tech can deactivate individual cylinders and check the loss of power or exhaust temp or something. I thought it was for identifying a bad injector but it might have other uses.