I just bought a 30' scarab with TRS drives on it. I understand these drives are not water cooled like the bravo's. My question is Do I need to do anything special to start the engines in my yard? I have already installed water inlets at the sea strainers so I can attach a garden hose to the engines. The engines are fresh water cooled. I am assuming as long as the transmissions stay in neutral I will be ok to run the engines right? I have some tuning to do to the engines before I drop it in the water so they are gonna need to run for a while.

Thanks In Advance

As long as you have water to the motors you're good to go.

The drives don't need water to run on the trailer.

Thanks for the info, I got it plumbed and running today.

Another stupid question, How do you keep the garden hose from collapsing from the suction of the sea pumps when connected to the engines?

You're limited by the amount of water your can deliver. Usually that's about 5-7 GPM while your sea water pump needs about 30 GPM above 3000 RPM.
You'll need to limit your engine speed to 1500-2000 RPM.
Something you can do to help but not fix is to use a 3/4" hose...but they cost about $50.

It collapses the line even at an idle. I guess I will try a 3/4" hose but I was thinking about just putting the pickup lines into a 55 gallon drum and letting them suck from there instead

Don't use a cheap hose. Get the real good ones.

Jon

to keep the line from collapsing you need to open the shut off valve i assume you are closing off on the sea strainer from the thru-hull bottom pickup....this will let some air into the system.....the sea-water pump is creating a vacume....been there done that!

I am shutting off the valves just befor the sea strainer. Should I be concerned with allowing air into the system, Won't it damage the sea pump impeller's?

As long as you have a decient water supply the pump can pass air with no problem...its when they run dry and heat up when the damage occurs. I work for a pump company...we tested the merc pump to see if we can adapt something along those lines in our product line....you would be VERY surprised at the amount of water the stock pumps can supply! And with a little lube (dish washing detergent in our case to get it started) they can pump a nice amount of air too!!!

Saw," Newby w/ TRS, Help," Thought, heck thats Me, read all and was enlightened, Thank You, I have a trans. leak, it seem to be back out at the transom, is there trans. fluid going to the trs drives.?