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bpboater
#1 Posted : Tuesday, October 06, 2009 3:43:23 AM(UTC)
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I changed transmission fluid as part of the year end shut down on my Marinette. I use a Jabsco reversible oil pump to pump the fluid out of the transmissions. I get about 2 quarts out of my 18 series velvet drives 2.57 ratio. In the past, I had a hard time refilling to the right level, especially the port transmission where the fill tube is outboard of the transmisssion. I could not reach it very well.

This time, I intentionally overfilled the transmission slightly, then using the transmission dipstick as a gauge, marked the depth the fluid should be below the fill tube on the suction tube used to suck the transmission fluid out of the transmission. I then reinserted the suction tube to that depth into the fill hole, sucked out the excess fluid and voila the level is perfect.
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fastjeff
#2 Posted : Tuesday, October 06, 2009 4:21:41 AM(UTC)
fastjeff

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I hope it was up to temperature when you checked it. If not, you're low.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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bpboater
#4 Posted : Tuesday, October 06, 2009 5:14:57 AM(UTC)
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To check the transmission fill level, I ran the engines at 2500 rpm for two minutes, shut off and immediately checked the fluid. Right on the money. When cold, I actually filled about 3/8 inch above the full mark, because the oil cooler is usually drained back into the transmission after being shut down for a while. I think that is why the manual says to check it right after shutdown. Funny thing is the transmissions were only up to 94F at this point. Later, under a hard run, the transmissions came up to 134F.

As an aside, I also measured the temperature of the engine oil filters after running on plane at 2800 rpm for about 10 minutes. Oil was 208F, just what I hoped for. I always run on plane for the return trip to the marina to heat the oil and boil off any moisture.
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jralbert
#6 Posted : Tuesday, June 15, 2010 2:42:36 AM(UTC)
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Here's another post on the subject from Karl (GB49)

Did mine a few yrs ago. No big deal at least on the 32'. Don't be surprised if there are no filter screens in the lines. Mine has no filters. I think Fastjeff can back me up on the filter issue.

Just get the trans warm and have lots of oil rags if you are prone to making a mess like me. Don't forget the correct level will be above the full mark on the stick when the trans have cooled. Must check the level immediately after warm up. Give it a few in & out of gear changes to pump the oil around and add a little at a time to top off at correct full mark.

I noticed smoother operation after the change. The oil color was much different too. Went from brown to pink/red.

-Karl
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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fishnatic
#7 Posted : Tuesday, June 15, 2010 4:04:22 AM(UTC)
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did anyone find the filter? really don't want to tear apart if not needed.my M is 87 29 twin.also have owners w/ freshwater boats changed oil coolers as a preventative measure against failure?
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fastjeff
#8 Posted : Tuesday, June 15, 2010 5:35:01 AM(UTC)
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An hydraulic systems expert (we worked on LNG locomotives together) told me that inlet filters in hydraulic systems are a crap shoot: If they plug up it starves the oil pump, aerates the fluid, and causes damage, but having no screens can allow crud to wreck the pump. Six of one, a half dozen of the other.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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