Turbo slow to spool up

[Mark]

This started happening after a long period of slow running (trolling Lures), now happens more often.

From slow running, push throttle up nothing happens. leave it half way and rpms slowly rise, then it springs into life turbo winds up and we are up on the plane 2500 rpm..

Intercooler is clean, AF is clean, hull is clean, prop is clean, boat is not over weight.

Topic

[Rob Schepis]

Any V hull is going to take some extra umph to get her over the hump, especially a single screw.  Sounds normal IMO.

[Mark]

Tthanks rob yeh just realised 3rd filter downstream of pump.

Well I’m on the water now in the bay, , new filters has got my 2800 rpm back. Up from 2500.

I turned the aneroid about 1/4 turn, now get a little black smoke under accel, for a few seconds. Is that ok?

 

 

 

 

 

[Rob Schepis]

Positive pressure at the last chance filter, +/- 25 psi or so…

[Mark]

Thanks Tony

That gauge would be to measure Vacuum?

 

Anyway Ive got 3 FS FGs in series.

Ill change them all.

 

Also searched boat diesel for answers to my aneroid adj, half turn.

 

[Tony Athens]

This symptom is 100% fuel restriction/starvation. Put a fuel pressure gauge on the output of your on-engine filter–Long hose so you can monitor it– 0-60 PSI

 

[Mark]

Hey Tony, can this lazy aneroid thing affect high rpm cruising as well as acceleration?

I still have not played with the aneroid adjustment after my last issue with slow acceleration. bit scared to play with it.

Today i trolled lures all day at 1000 rpm. all good.

Pulled the gear in and pushed up to 2500 rpm to head home. all good so far.

5 min later rpm drops to 2000, so a loss of power, wanders around a bit, up & down. I pulled back throttle to match rpm and went slow for a while. No black smoke.

then after a while i tried applying power, it did pick up and cruised home but same happened a few more times.

 

To me it felt like turbo was losing boost.

Any way if its just the aneroid adjustment thing, is there a guide as to how much to turn that wheel?

 

Mark

 

 

[Mark]

Thanks Tony ill try that. 

[Tony Athens]

Most Likely a Lazy Aneroid —  https://www.sbmar.com/articles/aneroid-adjustment-on-the-bosch-p7100-injection-pump/

 

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https://www.sbmar.com/repower-projects/widgeon-special-25-ft-bertram/  

[Mark]

When “nothing happens” is there black smoke? No smoke   Aftercooler is clean – what does that mean exactly? I serviced it after this problem started, it wasnt very dirty   What’s it’s service history? Be specific.. engine or AC? engine gets oil & filters every 100 hrs, AC  has been done a few times as per tonys method.   Has an underwater inspection been completed since this started, running gear and all? yes its been slipped a couple of times since problem started. Post some engine pics and be sure to include the turbo and exhaust.

[Rob Schepis]

When “nothing happens” is there black smoke?

Aftercooler is clean – what does that mean exactly?

What’s it’s service history? Be specific..

Has an underwater inspection been completed since this started, running gear and all?

Post some engine pics and be sure to include the turbo and exhaust.

[Author]

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