Airplane Guy
New Member
- Feb 26, 2013
- 24
- Boat Info
- 2006 44 Searay Sedan bridge
2005 Zodiac Yacht line 340, 30 hp Yamaha
GHS hydraulic Lift
- Engines
- Cummins QSC 500
Thanks for the advice
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Boat is new to me with 950Hrs so I am doing some PM work. I am installing new belts to start with. Is there any reason that I should be changing the Idler Pulley or Tensioner also? Do they have a service schedule as well?
Does anyone have P/N for Thermostats and gasket? I also heard there were two thermostats per engine. Is that true? if so are they the same? Thanks..
...I noticed that one of them shows dirt only on the lower half. My 48DA was doing that on one engine. The problem was air seeping into the fuel system under the Racor cover. The bowl was half empty when I checked it on one of the filter housings.
Unbelievable. You found it.So, here is the latest update, and I am hoping the lower-half dirty filter combined with something else I found are the cause and an indicator of the root cause (could I be that lucky?).
The stumbling problem persisted on and off, along with a bit of light gray smoke from time to time, and I became convinced there was an issue with the port low pressure fuel pump. I decided to trace the fuel line from the tank to the engine to see what else could possibly be restricting fuel flow.
At the very start of my tracing, I found this:
View attachment 58179
A kink in the fuel line between the tank and the Racor. I also noticed there appears to be an old screw hole where perhaps the retaining clamp used to be originally.
I wonder why the original owner would have repositioned this.
I changed the positioning, removing the kink, and the problem has been gone ever since.
Could this simple issue possibly have been the cause?
Unbelievable. You found it.