Can't Get Revs Above 700rpm on Volvo Penta 2002

[RSchute]

Hi All, Upon launching my boat, I'm able to start my Volvo Penta 2002 engine but I can't get the revs up beyond 700rpm with full throttle.

Fuel appears to be getting everywhere it is supposed to get to and I had the engine running for 45+ minutes but only at low RPM and on 2 occasions it went to about 2000RPM but quickly settled down to 700RPM.

A few things to note:

- I observed a good healthy stream of fuel coming from the bleed screw, the injectors and injector pumps when the nuts were cracked open.
- The lever attached to the fuel regulation system is moving the full range when the throttle is in idle to it's maximum throttle position.
- Fresh diesel is being run directly to the lift pump.
- Both injectors were replaced 2 years ago.
- The engine sounds okay at 700rpm

Does anyone have any ideas on why I can't get beyond 700 under full throttle?

 

[jamie N]

Welcome to the forum.
Would it be that the lever has become disconnected from the actuator 'inside' the body, such as a loosened grub screw?
I don't know your engine at all, but that's the thought that I had.

 

[Bilgediver]

Does it behave in the same way in both neutral and in gear.

 

[RSchute]

Does it behave in the same way in both neutral and in gear.

Yes, except in gear it would go to 500rpm and sometimes stop if the rpm was too low.

 

[Stemar]

That sounds like an issue with the governor or, a lot cheaper, the throttle cable or its connections.

 

[ithet]

Sounds possibly like that bloody bleed screw on the filter. See other recent thread about fitting a helicoil. When I had an issue the engine actually ran better with it sightly loosened and letting out fuel (I think when I tried to tighten it stopped fuel coming out, but air got in).

 

[Refueler]

May sound daft - but I had similar happen with my Perkins ... but it was not the engine or fuel system at fault. I have a single lever control for throttle and direction. The pawl connection sheered and the lever moved back and forth - gears worked - but throttle didn't move ...

All looked good ... I moved pump throttle by hand engine acted as it should ... but when handle moved ... nothing. but of course being alone - I couyld not see both engine and handle same time. It was only when I removed control from mounting - I then saw the broken arm

Pal of mine who may make my Arch made a Dural copy for 5 euros .... magic !!

I even gave the whole unit a birthday :

Before ...


After ....

 

[Malish]

Have you done anything to your engine and linked components since you last used it successfully?

 

[PetiteFleur]

Have you got a blocked exhaust elbow? That would give those symptoms