anyone replaced a transmission in a mid cabin?

BobCT · Post by **BobCT** » Sat May 12, 2012 7:49 pm

I think I made a really stupid mistake and ran my transmission dry forgetting about the leak I had last fall...

Anyway, it goes in/out of gear on the hard and if I had to pull it, I'd rather be in the water going the work. Just wondering if anyone has done it this way on a mid cabin or is there a huge advantage in pulling it while I'm out?

Bob

rooferdave · Post by **rooferdave** » Sat May 12, 2012 7:56 pm

I have a tri fly ( rear engines under the beds) pulling in or out the water no big deal either way. drain the tranny and put in fresh fluid as long as you have not warped / burnt your plates your cool, if the plates are warped it willl prob just (walk) in neutral

what I meant was I pulled my tranny on the hard apr27 and again on the 29 in the water

prowlersfish · Post by **prowlersfish** » Sat May 12, 2012 8:05 pm

Bob no advanage doing it on land . Unless you have 5000V v-drive ( I don't belive yours is a v-drive)

BobCT · Post by **BobCT** » Sat May 12, 2012 8:16 pm

I changed all of my transmission lines last fall and ran the engines one more time to test all the connections. I forgot to tighten the lower most hose and a lot of the fluid leaked out while idling.

Well, fast forward to this year and I completely forgot about that. I started the engines for the first time about two weeks ago and they ran fine. The shaft was turning but I didn't give it much thought because I didn't have the prop installed and figured the extra drag wasn't there to keep it stationary or close enough, barely turning. It idled for about 10-15 mins but never put in gear.

Installed my new alternator last night and figured I make sure that's ok since I'm supposed to go in next weekend. The engine is turning over and making this horrible dry pump sound. I figured it had to something with the alternator so I disconnected that and same thing. It's turning over, doesn't really want to start and making the noise.

Then I pull the dispstick and it's bone dry. I add some fluid, get it running and it's still making the noise and the shaft is spinning at a pretty good clip. Do this two more times, adding fluid and finally get it to where the noise has pretty much stopped and the shaft isn't rotating in neutral anymore. I tried it in reverse and forward and it goes into both gears but I still hear an occassional noise (not continuous) of that dry pump sound.

Since I just did the strut, I knew exactly how the prop should feel when rotating by hand and it's exactly as it was before which is good. It's definitely not seized up but I'm not sure if the sound will completely go away or get worse under load. It's got the right amount of fluid now and the noise is 95% gone... again all on the hard, at idle. It does make the noise more if I bring the idle up but again not continous like when I first started it. I assume it's the pump I heard and ran dry... is that fatal? Fluid is nice and pink but it's about 5 mins old too

What do you guys think? Do the pumps cavitate until they run for a while?

rooferdave · Post by **rooferdave** » Sat May 12, 2012 8:23 pm

Do the pumps cavitate until they run for a while?

yes

while you are running are you feeding water to the boat????if not your impeller will not be happy.

when you run the engine you will have to go forward reverse a few times to get the air out, but your tranny should be fine from what has happened

prowlersfish · Post by **prowlersfish** » Sat May 12, 2012 8:24 pm

If the fluid got air in it it will make a noise a growling or moan .

davidsmith · Post by **davidsmith** » Sat May 12, 2012 9:46 pm

Could it be the flex plate rattling with no load on it?

BobCT · Post by **BobCT** » Sun May 13, 2012 8:14 am

thanks for the replies, I feel a little better. Correct, they are Velvet drive straight shaft 10-82's.

Definitely not a flex plate rattle but sounds like a cavitation the more I think about it. I never engaged the shifters until it was showing something on the dipstick but it idled for about 15 mins the first time it ran and for some reason didn't make any noise.

Dave, yes I have a hose connection at my strainer so I can run it.

prowlersfish · Post by **prowlersfish** » Sun May 13, 2012 8:38 am

Putting it in and out of gear on land is not a great idea , you could damage the cutlass bearing as its lubed by water .

If it was me I would put it in the water and see what happens .

BobCT · Post by **BobCT** » Sun May 13, 2012 8:43 am

Prowlerfish, I only went in/out a few times but know what you're saying. I guess I'll just splash it like you say and see what happens. If I need to pull it, I'll do it in the slip.

prowlersfish · Post by **prowlersfish** » Sun May 13, 2012 8:52 am

You havent lost anything by trying . Just make sure your sea tow is paid up

BobCT · Post by **BobCT** » Sun May 13, 2012 6:38 pm

I disconnnected the coupler and did some testing today...

http://www.youtube.com/my_videos?feature=mhee

When I started it cold this morning, it made that aweful noise again for maybe 10 seconds. I tried to capture it on video but it didn't happen long enough. I shut it off and let it sit for about 3 hours and then started it again uncoupled and it didn't make any noise.

What you see here is just a few minutes after I started it...

The shaft seems to rotate (when coupled) in neutral for the first 20-30 seconds and then hardly move, if at all. I never noticed this before but never checked it so quickly after starting. You can see it spins at a pretty good clip in neutral uncoupled. Don't know if that means anything but assuming that running it dry would only affect the pump and not have anything to do with the clutches. Just an assumption, I've never had one of these apart before.

prowlersfish · Post by **prowlersfish** » Sun May 13, 2012 7:49 pm

No have no drag to stop it from spinning ( props in the water ) , ALL clutches have some drag some more then others . Jack up your drive wheels on your car and start it in neutral watch the wheels spin . its the same thing .

when I get on my lap top I will listen to it

jefflaw35 · Post by **jefflaw35** » Sun May 13, 2012 8:50 pm

[quote="prowlersfish"]Putting it in and out of gear on land is not a great idea , you could damage the cutlass bearing as its lubed by water .
quote]
not to hijack this at all!!! its just a thought in my mind. I will be land testing alot. I bought a dripless. will land testing hurt this? it will be getting water

rooferdave · Post by **rooferdave** » Sun May 13, 2012 9:56 pm

BobCT wrote:I disconnnected the coupler and did some testing today...

http://www.youtube.com/my_videos?feature=mhee

When I started it cold this morning, it made that aweful noise again for maybe 10 seconds. I tried to capture it on video but it didn't happen long enough. I shut it off and let it sit for about 3 hours and then started it again uncoupled and it didn't make any noise.

What you see here is just a few minutes after I started it...

The shaft seems to rotate (when coupled) in neutral for the first 20-30 seconds and then hardly move, if at all. I never noticed this before but never checked it so quickly after starting. You can see it spins at a pretty good clip in neutral uncoupled. Don't know if that means anything but assuming that running it dry would only affect the pump and not have anything to do with the clutches. Just an assumption, I've never had one of these apart before.

I do not have a you tube acc't so I could not listen, however when I started mine on the hard the sleve on the prop shaft hanger made horrific noise,, before you start on the hard next time pour some water on the hanger bearing/sleeve outside your boat and see if that is the noise

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anyone replaced a transmission in a mid cabin?

anyone replaced a transmission in a mid cabin?

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