D1105 NO POWER

pwr1

New member

Equipment
U25-3a excavator
Mar 11, 2026
2
0
1
Uk
Hi All, hope someone can help.
I've rebuilt a D1105 3cyl in a kubota excavator u25-3a. It came in with a badly cracked head and scored bores. It's been stripped to a bare block for the engine builders to re-bore. Now it's all back together it has no power. It's not great to start, runs rough at low idle, will rev to 2500 but the engines throttle is response is poor. If you apply a load via the hydraulics it doesn't appear that the governor is working. If at 2500 rpm when the load is applied it will eventually pull down to low idle.
The engine doesn't smoke at any point, it was recommended that I try the max fuel screw and still it doesn't smoke. Injector pump and injectors replaced/serviced.
The dealer says that the engine number doesn't match the machine and can't get parts/invo.
Genuine kubota manual is pretty vague!
Does anyone know the factory settings for the screws that set the injector pump linkages?? There not I the kunota manual and the dealer says they can't find out as the engine isn't the original.
Any help would be appreciated. Thanks
 

85Hokie

Moderator
Staff member
Lifetime Member

Equipment
BX-25D ,PTB. Under Armor, '90&'92-B7100HST's, '06 BX1850 FEL
Jul 13, 2013
11,069
2,990
113
Bedford - VA
Have you run a compression test on all cylinders?

Was anything changed via the injection pump? Shims added or removed?