Anything to do upon initial restart after full teardown? - Ducati.ms

Dan_Q · Feb 3rd, 2012, 6:20 am

I am about to reassemble my 748 after having taken apart every single bolt that wasn't part of the motor. Is there anything I need to do to prime the fuel and coolant systems? I'll refill the coolant resevoir but without the thermostat open there won't be any coolant in the heads or water pump. Not sure if there is a way to manually open the thermostat to get some coolant to fill before I start it or if it even matters. The fuel lines to the throttle bodies will also be devoid of any fuel. How do I prime the lines so that it will start? Or do I just hit the starter over and over and over until the fuel pump has filled them?

I've taken photos and notes along the way and will post a reassembly and rebuild log once the part time of rebuilding this bike is over.

davy.j · Feb 3rd, 2012, 6:52 am

The thermostat has a bypass so just lean the bike over to the right a little (the bleeder outlet is on the left side of the rear head outlet) fill the reservoir to the level than keep squeezing the top radiator hose (on the left side) to purge as much air as possible.
Start it up, let it idle till the thermostat opens and top up if needed.
They bleed pretty easy.

Soon as you switch on the fuel pump will prime the lines, you can hear the pump run for a second or two each time you turn the key.
Switch off and on a few times and it will self prime the system.

I would also remove the spark plugs and wind it over till you get oil pressure before firing up if it's been standing a long time.

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dzucati999r · Feb 4th, 2012, 7:58 am

Yeah, I agree, Spin the motor with the plugs out is most important. Then take a valium the size of a hockey puck, turn the key, say a quick prayer to Peter,Pat and Mike and all the saints and stab the starter.

ducati2242 · Feb 4th, 2012, 9:02 am

Quote:

Originally Posted by dzucati999r

Yeah, I agree, Spin the motor with the plugs out is most important. Then take a valium the size of a hockey puck, turn the key, say a quick prayer to Peter,Pat and Mike and all the saints and stab the starter.

Dont think hes had the motor apart as he says ` having taken apart every single bolt that wasn't part of the motor`So as long as theres water then there shouldn't be any problems.

davy.j · Feb 4th, 2012, 7:03 pm

If the motor has been sitting for any length of time the rocker gear is going to be bone dry so why argue when we suggest spinning it over with no load to get the rockers wet? Costs nothing, takes but a few minutes.
Duc's can take around 1.5 minutes to pump oil to the rocker gear at the best of times. Cold starts are when most rocker gear wear occurs in any engine.

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Booster · Feb 4th, 2012, 9:47 pm

Is there any problems damaging the ignition system turning over the motor with the starter and the plugs disconnected? I know some ignitions in autos and outboards do not tolerate this.

ducati2242 · Feb 5th, 2012, 3:20 am

Quote:

Originally Posted by davy.j

If the motor has been sitting for any length of time the rocker gear is going to be bone dry so why argue when we suggest spinning it over with no load to get the rockers wet? Costs nothing, takes but a few minutes.
Duc's can take around 1.5 minutes to pump oil to the rocker gear at the best of times. Cold starts are when most rocker gear wear occurs in any engine.

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All I was doing was pointing out that the motor had not been rebuilt. If it had then maybe I would spin it over to check oil pressure but it hasnt . How long has it been standing and whats this `length of time` you refer to . If Ducs took 1.5 minutes to pump oil up to the rockers then there is something seriously wrong with them. Stick to facts and not your interpretation .

916duc · Feb 5th, 2012, 5:01 am

Not a good idea as it can damage the coils if the plugs/wires are not grounded.

If you want to circulate the oil system, turn the motor over by hand. Pull the plugs, put it in second gear and spin the rear tire several times.

Quote:

Originally Posted by Booster

Is there any problems damaging the ignition system turning over the motor with the starter and the plugs disconnected? I know some ignitions in autos and outboards do not tolerate this.

davy.j · Feb 5th, 2012, 5:41 am

Quote:

Originally Posted by ducati2242

All I was doing was pointing out that the motor had not been rebuilt. If it had then maybe I would spin it over to check oil pressure but it hasnt . How long has it been standing and whats this `length of time` you refer to . If Ducs took 1.5 minutes to pump oil up to the rockers then there is something seriously wrong with them. Stick to facts and not your interpretation .

Obviously you don't know much about Duc's, as they are notorious for taking a long time to get oil to the heads (a search will probably educate you on this

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davy.j · Feb 5th, 2012, 5:43 am

Quote:

Originally Posted by 916duc

Not a good idea as it can damage the coils if the plugs/wires are not grounded.

If you want to circulate the oil system, turn the motor over by hand. Pull the plugs, put it in second gear and spin the rear tire several times.

So why not ground the plugs and spin on the starter (I do)
You can pull the back wheel around by hand for ever & not get oil up to the rockers which was after all my original point.

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