John Deere 755 blowby

[Marty6645]

I have a John Deere 755 with 2100 hrs on a 3 cylinder yanmar. Tractor has quite a bit of blowby through the vent tube. I was wondering if this was a sign the motor needed rebuilt. Tractor is running with plenty of power. Just alot of smoke.

 

[R_Redding]

Tractor has quite a bit of blowby through the vent tube. Just alot of smoke.

I would be preparing to rebuild it...
If you've got blowby , excessive oil consumption and pressure loss, excessive smoke and maybe a loss of compression, its time to rebuild before it gets really expensive...Its only going to get worse and it could destroy itself in the process...

Rob

 

[R_Redding]

I just noted your glowplug thread...

hard starting or failure to start (especially in cold weather) can be caused by faults other than worn engine (blocked filters ,glowplug failure etc) , but in your case I would expect that the two go together..

I'd also try to return it to the guy you bought it off...


Rob

 

[BTDT]

How much did you give for unit? Did you buy it knowing/thinking that a rebuild was in your near future?

 

[art]

Diesels need compression to run. You might have a problem here. The blow by would tell you the rings are leaking compression which in turn would give hard starting.

 

[Doc_Bob]

How many hours?
New or used?
Have you done the oil changes yourself?
Diesel rated oil?
Bob