I've searched this on this site and have seen the problems with the plugs in the ends of the cam on the older Kubota B7100d. Mine is a 83 and has lost oil psi. It has 1300 hours on it. When you let it set and start it, if you let it idle the oil light will not come on, if you raise rpm off idle the light comes on and stays on. So here is what I have done so far.
1. Changed oil and filter
2. Cut top off old filter and looked inside, no metal
3. Removed front cover to have a look and see if plug was in front of cam, it is.
4. Removed oil pan and had a look in there no metal and is clean. Had a look at the oil pick up screen and nothing blocking it. Gave the rods and mains a shake and nothing seamed loose.
5. Put front cover back on and hooked up a old fuel oil pump to the stub that the oil filter goes on and primed it with oil and turned it on. Oil dripped from the mains and rods. Oil was running back trough the hole in the block from the front cover area. Looked inside the cover from the throttle hole and could see oil squirting from the gear in the center. Was showing about 3 psi on the gauge i have hooked where the sending unit for the oil light goes.
6. Pulled front cover again and had a look inside and looked at the gear that was shooting oil and the hole is a factory made hole. Also noted that there was a lot of oil on the front of the cam so looked closer at the cam and the plug has 2 holes in it.
So here is where i stand, I don't think the holes are supposed to be there.
Also if the front plug is bad should i change the rear also. If so what is the best way to do it remove the motor and go trough the back or pull the head and and valve train and remove the cam that way?
Here is a picture of the cam so you can see what I'm dealing with. Also I've changed the oil bypass valve, no change.
1. Changed oil and filter
2. Cut top off old filter and looked inside, no metal
3. Removed front cover to have a look and see if plug was in front of cam, it is.
4. Removed oil pan and had a look in there no metal and is clean. Had a look at the oil pick up screen and nothing blocking it. Gave the rods and mains a shake and nothing seamed loose.
5. Put front cover back on and hooked up a old fuel oil pump to the stub that the oil filter goes on and primed it with oil and turned it on. Oil dripped from the mains and rods. Oil was running back trough the hole in the block from the front cover area. Looked inside the cover from the throttle hole and could see oil squirting from the gear in the center. Was showing about 3 psi on the gauge i have hooked where the sending unit for the oil light goes.
6. Pulled front cover again and had a look inside and looked at the gear that was shooting oil and the hole is a factory made hole. Also noted that there was a lot of oil on the front of the cam so looked closer at the cam and the plug has 2 holes in it.
So here is where i stand, I don't think the holes are supposed to be there.
Also if the front plug is bad should i change the rear also. If so what is the best way to do it remove the motor and go trough the back or pull the head and and valve train and remove the cam that way?
Here is a picture of the cam so you can see what I'm dealing with. Also I've changed the oil bypass valve, no change.