Deisel service numpty question

[niccapotamus]

Going to finish engine service tomorrow. My first time .

I ould like to test it after bleeding. Can i run it ok for a minute or so with no cooling water (raw watet cooled) or do i have to connect up a bucket of water so that the impeller doesnt have a melt down.

Thanks!

 

[macd]

The potential issues are twofold:
1. the impeller will not like running dry. It won't melt down, but it could be damaged. For a quick run you could take the impeller out, but it probably wouldn't take much longer to rig up your bucket.
2. without water the exhaust will run hot...probably far hotter than the spec for the hose/watertrap.
For a very brief run, neither of these will be an issue (especially if there's water lingering in the impeller housing/watertrap). But how long is "brief"? Rig up a bucket fed by a hose and do it properly. (You seem to know this already, but it's worth repeating: on no account feed a pressurised hose directly into the raw water intake.)

 

[Halo]

No point in running for a few seconds as it won't prove anything
I always service engine when in the water. Suggest you rig up and run for a while or run when in the strops during launch before letting go

 

[C08]

I used to take the top off the Vetus water lock and just pour water into the filter bowl with the through hull shut off. My engine only used a kettle full every half minute at tickover ,long enough to keep refilling it.

 

[MOBY2]

Hi I put a bucket in the cockpit with a hose and a longer tube from the jabsco both cable tied to the bucket handle, run the hose then run the engine, know roughly how much to turn the hose on to keep up with the engine intake any surplus just drains out the cockpit drains so nothing goes down below, only a Nanni 10hp so not a great deal of water used...have run it up for an hour to get up to temp after my first service of that engine, also removes salt water from the engine which is not a bad idea, hope that's helpful.

 

[Avocet]

+1 for the bucket. The pump will prime as long as the impeller isn't bone dry and it's not having to suck the water through a great height. We're probably past the worst of the winter now, but remember your engine will have fresh water in it when you finish, so it might be best to drain the block afterwards.

 

[MagicalArmchair]

I wrote this to remind myself the process of servicing my 2gm20, let me know if its any help: http://www.albinballad.co.uk/how-tos/yanmar-2gm20-engine-winterising-and-service/

 

[Jabamusic]

Rigging up a water feed is relatively easy, the tricky bit is being confident that the cradle the boat is in will cope with the vibrations from the engine. Some boatyards disallow owners from running their engines whilst on the hard for just this reason.

 

[macd]

Rigging up a water feed is relatively easy, the tricky bit is being confident that the cradle the boat is in will cope with the vibrations from the engine. Some boatyards disallow owners from running their engines whilst on the hard for just this reason.

Strange. Having spent a winter living aboard on the hard, I can assure you that vibrations from wind in the rig are far, far greater than from any engine likely to be installed in a yacht.

 

[Spyro]

As said it'll only prove it starts. After bleeding I'd want to be running for 10 min or so tied up to make sure there is no air in the system or none getting in but it is a good idea to know it will start once it's back in the water. It may save a bit of hassle when your hanging in the slings.