4020D compression

4020_1966 · Feb 23, 2010

Its in the shop getting a set of new injectors (4 tested bad and the last 2 were almost bad) and I had them run a compression test on it. The foreman said they came out excellent and surprisingly close to each other (5 were 375 1 was 360). What are the normal ranges? I had them test the trans pump and it came out low on flow (<3gpm at pressure) so they are tossing one of them in as well. I'm also having them toss in a lift pump and a set of brakes on it while its in the shop getting the other stuff done. I don't have much other work planned for it right now. I am hoping with the new injectors it will run a lot smoother and stronger.

buickanddeere · Feb 23, 2010

I don't have a service manual but a "similar" speed,size and rpm diesel project here. Is rated in the factory info as having 535psi compression pressure and 1050 firing pressure.

4020_1966 · Feb 23, 2010

Do you know what compression that engine runs? I havn't had much luck finding that data in my Service manual (SM 2039). I havn't had it very long so I am probably not looking in the right place. Any engine rebuilders have any clue? Tim? Any body else out there know what thiers ran?

JDemaris · Feb 23, 2010

Test PSI is dependent on how fast you've got your 4020 diesel cranking. Same goes for any tractor.

If spinning at 450-475 RPM - it's supposed to test at 450 - 475 PSI.

If spinning at 200 RPM - it will only read around 300 PSI.

Main thing to look for is having all the cylinders close to the same.

4020_1966 · Feb 23, 2010

I didn't run the test. The dealership did it. I honestly do not know what RPM a starter rolls one over. Thanks for the input.

4020D compression

4020_1966

Member

buickanddeere

Well-known Member

4020_1966

Member

JDemaris

Well-known Member

4020_1966

Member

Similar threads