Having never done a compression test in my life, I decided to see what the compression on my 20 year old, 213k mile D15B7 was. Are these numbers good for an engine this old and used? From what I've read, 185 in nominal, 135 minimal.

Cynlinder/Dry/Wet

#1 D-155, W- 170
#2 D-162, W-172
#3 D-170, W-192 (?)
#4 D-168, W-185

Test was done on cold engine, with accelerator to the floor, engine turned over 7 times per cylinder.

 

Cylinder compression tests are done on a warm engine whenever possible. Cold numbers are less meaningful.

 

Those numbers look ok. # 3 and 4 may have some carbon build up.

 

agree 100% definitely redo with engine at operating temperature..