Volvo D4 Turbo stuck again!

[Ocalatug]

Lost boost pressure on my CB29 with the D4 Diesel so I cleaned the stuck blades and the boat ran fine for the next 2 outings. During the last run I ran close to max rpm for a good portion of the trip home. I ran at idle for 10 minutes while in the marina then I allowed the boat to cool down for 10 minutes before shutting down. I've been out of town and the boat has set for 4 weeks. Fired it up and it wont do over 1500 rpm with no boost pressure so the blades are stuck again. Any secrets other than running at higher rpms to keep from coking up. This is getting old fast.

 

[gwishon]

Are you sure it’s a stuck turbo? I would remove the elbow and confirm that the vanes won’t move (fairly easy to do). If the vanes spin and there is no coke buildup impeding their movement, the problem is elsewhere.

Gordon

 

[Kevin Lamont]

Lost boost pressure on my CB29 with the D4 Diesel so I cleaned the stuck blades and the boat ran fine for the next 2 outings. During the last run I ran close to max rpm for a good portion of the trip home. I ran at idle for 10 minutes while in the marina then I allowed the boat to cool down for 10 minutes before shutting down. I've been out of town and the boat has set for 4 weeks. Fired it up and it wont do over 1500 rpm with no boost pressure so the blades are stuck again. Any secrets other than running at higher rpms to keep from coking up. This is getting old fast.

Hello,

I would agree with Gordon above, checking the turbo would be a good first start. Also you may want to reach out to a local Volvo Penta dealer to possibly have it checked out by a certified tech. Hope this helps.

Thanks,

 

[Ocalatug]

Next chance I get I'll pull the elbow and re-clean if necessary. Pretty sure its the same issue as last time due to the exact same symptoms. If the blades are moving, I'll check bypass operation etc. Thanks

 

[BradN]

I was having the same symptoms with my D4 intermittently, so mentioned the stuck vanes as a possible culprit to my mechanic. Turned out it was a Boost Pressure Sensor, cost about $150. It resolved the problem.