Diesel engine problem

[Capt Joe hp]

I run a Volvo penta diesel engine, Recently when I throttle up there is a delay bringing up the rpm's, after about 20 or 30 seconds she responds and runs fine, I just changed filters ( no help). I was wondering if I should put in that injector cleaner in the fuel tank or does any one have ideas as to what the problem could be. The engine has 750 hours on it.... Thanks


Capt Joe
26 Osprey Diesel
Gerritsen Beach, Brooklyn

 

[Don S]

Re: Diesel engine problem

Suppose you could give us a hint as to the year and model number of this "Volvo Diesel" you have?

 

[QC]

Re: Diesel engine problem

What does she do during that 20 - 30 seconds? Smoke? If so, color? Misses? Acts 100% normal after the 20 or 30? What happens if you return to idle after the first 20 - 30 second cycle? Same thing?

 

[Capt Joe hp]

Re: Diesel engine problem

no smoke no changed remains the same... motor is a 2003 AD41 with an i/o drive... 200 HP

 

[QC]

Re: Diesel engine problem

Hopefully DonS will chime back in as he's the most experienced with Volvo's. Until then I will try and muck this up a little . . .

Almost all turbocharged diesels have a smoke limiter of some type that restricts fuel flow until the turbocharger can develop sufficient boost to eliminate the otherwise large column of black smoke . . . On a mechanical fuel system like yours there should be some sort of small air line from the cold side (compressor) of the turbo (could come from anything between the compressor outlet to the intake manifold), going to somewhere on the injection pump/governor combo. I can't quite tell from the pictures I found here: AD41 Operation Guide

This is a guess at this point, but I would check to make sure that the smoke limiter is working properly. Typically there is some sort of diaphragm that the boosted air from the turbocharger "pushes" on to allow full fuel control travel within the governor. It is possible that this diaphragm or other similar design is leaking or otherwise causing a slow reaction to increased boost, thus restricting fuel flow for longer than normal . . .