B6100 Oil pressure

[stewy]

Hello folks
Nice web site, alot of good reading here

I searched around your site and found some posts about oil pressure problems. Is there a spec for what a person would expect to see when checking pressure?

I just bought a B6100E and after fixing the broken oil light, I found that it comes on at idle.
I checked it with a guage and found approx 14 psi at near full throttle and 4 psi at idle.

I heard mention of 70 psi from the pump in another post and just wondered what a normal pressure would be after the oil travels through the rest of the engine.

Any thoughts would be appreciated
Stewy

[Service Dept Vic]

Hi Stewy,

Welcome to our site! The ZL600 engine in your Kubota B6100E operates with 34-36 PSI oil pressure at maximum engine rpm, and 7-11 PSI at idle.

The normal allowable lower limit of oil pressure at operating rpm is 28 PSI.

Do you have the correct amount of and correct viscosity of oil in the engine? Are you satisfied that the oil filter is of a known quality?

Is your tester in good order?

If you answered yes to all those questions then you may be looking at the possibility of an engine overhaul to restore the engines oil pressure to it's normal operating range.

[stewy]

I was going to give it an oil change anyway, so I'll check it again after that.
It does have a Kubota filter on it and I'm fairly certain my guage is accurate.

In your experience Vic, would you see any problem with me using 15w40 in it?
If I still have pressure problems after that then I guess it's time for a teardown :(

Thanks
Stewy

ps: isn't the ZL600 engine a 2 cylinder?

[KeithBarney]

My 1980 model B6100E came with a D650 3 Cylinder which is on a sticker on the engine and also stamped D650 on a plate by my left foot.

Now that I got my original sending unit off and have hooked up two different mechanical gauges my pressure exactly matches Stewy's. I don't mean it is similar, I mean it is exactly the same.

Wasn't there some talk about a bad batch of Kubota oil filters that came with pressure relief springs that were too weak?

[Service Dept Vic]

Ya, I'm an idiot! I was busy answering a PM to someone else on an oil pressure spec for a B6000 with a ZL600 engine and I got onto the wrong page of my forum thing!!

Mr. K is going to punish me for that!

Keith is correct, the B6001 and B6100E's and D's were equipped with the D650 3 cylinder engine.

The correct oil pressure specification for the D650 engine is:

28-64 PSI Maximum at full operating RPM
10 PSI Minimum allowable at idle
28 PSI Minimum Allowable Oil Pressure at full operating RPM

Using 15W40 oil would be OK for year round performance in climates that are typically cooler (have four distinct seasons). With hot southern US States, I'd stick with 10W30.

[stewy]

Not at all Vic, you're a wealth of information that everyone taps into :)
Ya, I'm an idiot! I was busy answering a PM to someone else on an oil pressure spec

I changed the oil & filter and it helped but I'll wait until it gets worked a bit so I can get some good heat into the engine and check it again.

Also changed the hydraulic fluid and cleaned the strainer...OMG! I think it was original from 1982.

Thanks again for the information from the members here
Great site!

[Service Dept Vic]

Roger that!

[ipz2222]

""I heard mention of 70 psi from the pump in another post and just wondered what a normal pressure would be after the oil travels through the rest of the engine""
Just clarifying. When you put a guage on an eng, you are measuring pressure between oil filter and all other moveing parts. Some engines will actually have the port between the pump and oil filter. You cannot measure pressure after it travels through the eng.

[dem45133]

Ya, I'm an idiot! I was busy answering a PM to someone else on an oil pressure spec for a B6000 with a ZL600 engine and I got onto the wrong page of my forum thing!!

Mr. K is going to punish me for that!

Keith is correct, the B6001 and B6100E's and D's were equipped with the D650 3 cylinder engine.

The correct oil pressure specification for the D650 engine is:

28-64 PSI Maximum at full operating RPM
10 PSI Minimum allowable at idle
28 PSI Minimum Allowable Oil Pressure at full operating RPM

Using 15W40 oil would be OK for year round performance in climates that are typically cooler (have four distinct seasons). With hot southern US States, I'd stick with 10W30.

Hello all.

Just picked up a B6100 HST and was gleaning these forums... I have a question/comment on the above. Do you not have the oils turned around? You'd want a thicker oil in the hot climates... thinner in extreme cold. I run Rotella T 15/40 in everything unless it will be below zero. Then a lighter wt for just those months.

What oil does Kubota recommend the B6100 3 cyl diesel... summer ops?.
(sorry don't have the ops manual yet... or any manual for that matter... looking for a used B6100 service manual.... any ideas?)

Dave