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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > repairing diesel engine on the dry
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Thread: repairing diesel engine on the dry Reply to Thread
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Topic Review (Newest First)
10-28-2012 09:29 AM
Minnewaska
Re: repairing diesel engine on the dry

Quote:
Originally Posted by RichH View Post
.....Most Diesel boat engines in the 30 hp range will need ~3 gallon per minute for running at ~2000 rpm.
I think this a rather light. I never really thought of the GPM of the seawater pump. Having recently winterized, I pumped 5 gallons of antifreeze through the genset pretty quickly, so I looked it up. It has a 13hp Yanmar and pumps 5.5 GPM.

Edit: the 26hp version of the same gen, pumps 13 GPM.
10-27-2012 11:53 PM
RichH
Re: repairing diesel engine on the dry

First look at your engine's tech manual for the raw water pump specifications - rpm vs. gallons per minute. Get a large tub (about 10 gallons) and put it into your cockpit' and adjust the water (garden) hose inflow to the tub to be approx. that needed, any spillover from the tube will empty through the cockpit drains. The goal is to keep the tub full when the engine is running.

Most Diesel boat engines in the 30 hp range will need ~3 gallon per minute for running at
~2000 rpm.

Run/extend a hose from the raw water pump to the bottom of the tub, completely fill the hose (no air); start the engine; watch/monitor (need assistant) the level in the tub so that you 'have enough' in the tub at all times.
A cheap plastic mason's tub (Home Depot, etc.) will be in the 10 gallon size range.
10-27-2012 07:20 PM
Paladin
Re: repairing diesel engine on the dry

I have seen people hook a water hose directly to the engine and blow the seals right out of a brand new water pump, let the engine do what it naturally does, suck the water up.
10-09-2012 06:05 PM
leogallant
Quote:
Originally Posted by Stu Jackson View Post
Never, ever, never, ever connect a hose directly to the engine rw intake. Never.

Here's that "missing link"

Winterizing A Diesel Engine On The Hard - SailboatOwners.com

Not very hard, explains it all.
Ahh, thanks so much. I was going crazy thinking it had been Maine Sail after all, but couldn't find!
10-09-2012 02:00 PM
Stu Jackson
Re: repairing diesel engine on the dry

Quote:
Originally Posted by Rockter View Post
Stu Jackson :

I must just be permanently lucky then.
.
No one is ever permanently lucky.

For proper attribution, it's not my method, Maine Sail did that video.
10-08-2012 12:55 AM
hellosailor
Re: repairing diesel engine on the dry

Rockter, when Stu says "Never" that's because sooner or later, most folks will have an accident leaving the water pressure ON when the engine is OFF. In your case you are manually ensuring that the water pressure is OFF except while the engine is running. That's great, as long as you never make a mistake or get interrupted.

What Stu says is safer. If folks do it his way, they simply can't have the accident that you can. That's just called good engineering, i.e. setting up things and procedures that guarantee an accident can't happen.
10-07-2012 07:52 PM
boatpoker
Re: repairing diesel engine on the dry

Quote:
Originally Posted by Stu Jackson View Post
Never, ever, never, ever connect a hose directly to the engine rw intake. Never.

Here's that "missing link"

Winterizing A Diesel Engine On The Hard - SailboatOwners.com

Not very hard, explains it all.
+10 .... Absolutely Correct !
10-07-2012 05:38 PM
Rockter
Re: repairing diesel engine on the dry

Stu Jackson :

I must just be permanently lucky then.
I have done it quite a few times.
As long as the engine is running when the hose is pressurised, and the hose turned off before the motor is stopped, there is no way on this earth that water pressure will ever be able to beat exhaust pressures.
I am not keen on the idea if it can be avoided, but it is self-priming and is far easier than filling a bucket. When you are working alone and trying to balance a bucket, it has advantages to use a hose (with a stop fitting on the engine end of it).
.
10-06-2012 01:44 PM
Stu Jackson
Re: repairing diesel engine on the dry

Never, ever, never, ever connect a hose directly to the engine rw intake. Never.

Here's that "missing link"

Winterizing A Diesel Engine On The Hard - SailboatOwners.com

Not very hard, explains it all.
10-06-2012 08:28 AM
Rockter
Re: repairing diesel engine on the dry

Putting a hose onto the intake will work, as long as you do not leave it running pressured with the motor off. If you do, you will fill up the exhaust system and at least one of the cylinders with water, and possibly the sump too.

The bucket is a better idea, really. Have a friend use the hose to keep the bucket topped up. Don't let the water level in the bucket drop too low, or the cooling system may get air-locked with a slug of air. This tends to happen with an older (and worn) water pump.

Have the friend keep checking that water is coming out of the exhaust.

Be careful.
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