Transmission Oil Pressure | Allison's on 8V92TAs

[Victory52]

1996 8V92TA's with Allison's in a Hatteras 52' CPMY. First time out for a legit sea trial. Ran out of fuel on main tank, after switching to another tank and getting her going again I had high transmission oil pressure (see photo, 220+) readings on Port motor (which had stalled). GPH was also 3-4 for low idle setting (limping back to the dock as fuel gauges are questionable). Temp remained inline/consistent with Starboard. Voltage was also reading low. I checked oil on drives which were totally clear and a good reading on the sticks. Replaced the o ring on the port dipstick as it had no suction. When not under load at the dock I could not repeat the issue. Any thoughts on what could be wrong, places to start?

[Captain Ralph]

Voltage was also reading low.

You mentioned low volts on a DDEC system. Fix or verify that first.
If you did a lot of cranking on that engine to get it running after running out of fuel, batteries must be low or a new DVc bad connection.

[SKYCHENEY]

Low voltage or bad ground can really mess with electronic readouts.

[Victory52]

You mentioned low volts on a DDEC system. Fix or verify that first.If you did a lot of cranking on that engine to get it running after running out of fuel, batteries must be low or a new DVc bad connection.

I was thinking it could be low voltage creating havoc with readouts. What is a DVc?

[Victory52]

Low voltage or bad ground can really mess with electronic readouts.

Hi Sky, I'm just South of you in Muskegon. Will verify voltage. I was getting 11.9v on return leg.

[Captain Ralph]

What is a DVc?

Sorry, I meant DCv.
Direct Current volts. Battery voltage.

When you get old, some brain cells get lost or sacrificed or since I don't know how to type;
Some things just jet posted incorrectly.

DDEC needs good-clean, full charge and lots of battery voltage.

[SKYCHENEY]

Hi Sky, I'm just South of you in Muskegon. Will verify voltage. I was getting 11.9v on return leg.

There may be a Vanner voltage converter somewhere there. I had one on a motorhome that wasn't putting out proper voltage and it caused problems with my DDEC 8v92.

[Victory52]

There may be a Vanner voltage converter somewhere there. I had one on a motorhome that wasn't putting out proper voltage and it caused problems with my DDEC 8v92.

I may also have drew the batteries down too much cranking over to get it fired back up. Didn't consider a voltage converter though, will inspect.