oil pressure question

[dieseldude]

Good Morning,

I have an oil pressure for anyone. The last few times I started my engine, I noticed it took maybe 10 - 15 seconds before oil pressure was indicated. Once it showed, it shows good pressure and fairly steady around 60 cold 40 hot. Just asking so I don't ruin a fresh rebuild. I'm thinking it's draining back or possibly too thick (rotella 15w-40). Has anyone else expierenced this? If it matters this engine is no longer in any piece of equipment.

Thanks for any input.

 

[North Idaho Wolfman]

Is the pressure gauge attached directly to the motor or remotely?
Is it a mechanical gauge or an electrical one?
What brand of filter did you use?
I'm guessing it's a fresh rebuild, did you replace the oil pump?
What type of gasket sealing compound did you use?
How many min / hours do you have on it already?

 

[dieseldude]

gauge is directy attched
gauge is mechancal
filter is a baldwin (bt223)
oil pump is original but within spec of service manual
no sealant, no visible leaks
about 1.5 hours moderatly loaded most of that time

rebuild was not a complete rebuild, was more of a refreshing. Rings, pistons, wristpins, big and little end bearings, crank bearings, injector nozzles and reset pressures, head gasket, lapped valves, new thermostat and housing, and a light honing to restore crosshatch.

 

[North Idaho Wolfman]

What model # is the motor?

 

[lsmurphy]

gauge is directy attched
gauge is mechancal
filter is a baldwin (bt223)
oil pump is original but within spec of service manual
no sealant, no visible leaks
about 1.5 hours moderatly loaded most of that time

rebuild was not a complete rebuild, was more of a refreshing. Rings, pistons, wristpins, big and little end bearings, crank bearings, injector nozzles and reset pressures, head gasket, lapped valves, new thermostat and housing, and a light honing to restore crosshatch.

I'm wondering if he was referring to bleed-out where the pump mates to the block????



No, I don't think the oil is too thick.



Did you have the block hot tanked? I'm wondering if the journals are clogged?


Oil pressure should begin to build as soon as you crank it over, 15 seconds does seem like a long to before your gauge registers.
If it were me, and since it's not in a machine, I would pull the pan and inspect the pump and pick-up again. Possibly replace the pump.

 

[dieseldude]

North Idaho:

enging model # is Z482

Ismurphy;

After reading your reply, I tried something on a hunch. I removed the oil filter, held stop lever in off position and cranked the engine. Almost immeaditly oil started flowing from where the filter attaches. I just wonder if the filter is draining out when it sits. By no means is this a good test, but it leads me to believe the pump isin't draining, I could be wrong.

To answer your question, no it was not hot tanked. Had planned to until I got into it. The inside was nearly pristine, no buildup or sludge anywhere including the pan.

I failed to mention before that the longer it sits between runs the longer it takes to build pressure. A day or two its up in a few seconds, a week or so much longer.

Thanks.

 

[freewheel3]

Put a Kubota filter on it and see what happens. Maybe the Baldwin filter is draining back when the engine is shut down.

 

[North Idaho Wolfman]

Yep try a Kubota filter and see if you get better readings.
If your getting flow to the filter right away I'm guessing that's most if not all of the problem.
Also it could be a slow or bad gauge too, I had one years ago that was just bad.

 

[dieseldude]

Many thanks on the input.

I'll have to find a place that carries Kubota filters. Normally on something like this I use a wix / napa gold, but will give the oem a try.

A slow gauge is something i hadn't considered thanks for the tip.

Thanks again

 

[BotaDriver]

Do you happen to have your manual handy? I think you'll find it to say to 'warm up' the engine at 1/2 of rated RPM. The 3800's is 2700 RPM so before I shut off the tractor, I bring the RPMs up to 1300-1350 RPM. That way when I go to start it again I don't have to worry about starting then setting the RPM. I've also noticed that oil pressure comes up significantly faster this way.

 

[lsmurphy]

Do you happen to have your manual handy? I think you'll find it to say to 'warm up' the engine at 1/2 of rated RPM. The 3800's is 2700 RPM so before I shut off the tractor, I bring the RPMs up to 1300-1350 RPM. That way when I go to start it again I don't have to worry about starting then setting the RPM. I've also noticed that oil pressure comes up significantly faster this way.

If he has no oil pressure at startup the last thing he needs is RPMs.





OP- you stated that you tried multiple filters, I assumed that you tried multiple brands. I would have first suggested that you move on to another brand of filter first.

 

[dieseldude]

Ismurphy;

I usually use a wix (AKA napa gold) filter on my other diesels(lombardini and 7.3l international). I havent bought one for this engine yet. The only reason I use wix is availibility. The nearest kubota parts supplier is about 45 miles form here.

 

[BotaDriver]

If he has no oil pressure at startup...

I've yet to see a vehicle without a dedicated prelube that engages before starting occurs, have any oil pressure at start-up.

So none of us have any oil pressure when we hit the switch. A lot of vehicles that have oil pressure lights have a short period of time to let it build before throwing a warning. I believe he already stated he's going to try a different filter, might want to try starting it per the manufacturer's recommendation too.

The L3800 has a no delay light, and starting at its low idle can take up to 4/5 seconds to build pressure for the light to shut off. Starting at 1350, I've never seen it on for longer than a second.

 

[lsmurphy]

I've yet to see a vehicle without a dedicated prelube that engages before starting occurs, have any oil pressure at start-up.

So none of us have any oil pressure when we hit the switch. A lot of vehicles that have oil pressure lights have a short period of time to let it build before throwing a warning. I believe he already stated he's going to try a different filter, might want to try starting it per the manufacturer's recommendation too.

The L3800 has a no delay light, and starting at its low idle can take up to 4/5 seconds to build pressure for the light to shut off. Starting at 1350, I've never seen it on for longer than a second.

Don't take my statement out of context. If you read the OP, he states he has, according to his guage, oil starvation for the first 15 seconds at startup.

 

[BotaDriver]

Don't take my statement out of context. If you read the OP, he states he has, according to his guage, oil starvation for the first 15 seconds at startup.

I understand, 15 seconds is rather concerning. Just curious what replacing the filter and ensuring proper 'warm up' RPM does in this case.