[Cato Jensen]

Well, it’s actually more like an inline valve. Couldn’t find any part number on mine. I’ve attached a photo.

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Bob Fitch

[Cato Jensen]

There is a valve inside the banjo bolt. I think its a spring loaded ball. Non-return and slight positive pressure for opening. Sometimes it will make a hissing sound when you are operating the priming pump.

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Bob Fitch, Tony Athens

[Cato Jensen]

As you already seeing black smoke, I doubt adjusting the aneroid will do you any good.

Did you check for any charge air leaks? Does the turbocharger compressor look clean?

Finally, i’m thinking about injection pump timing. Has it been checked/adjusted? The plastic timing pin of the Nippondenso pump is unreliable and inaccurate, it is recommended to adjust timing using the spill port timing procedure.

What’s the RPM’s and the boost when you struggle over the hump? and at WOT?

[Cato Jensen]

It’s been a while, but i finally got around to doing some trials. As for the environoment, Tony. It’s rain – we get lots of rain here on the Norwegian coast.

I didn’t pull the exhaust riser, but i did check the bearings of the turbo. Thrust play is more than I prefer.

From what I can tell from the tests, my old propeller was probably cavitating going on plane. Also, the aftercooler is probably a little on the small side, I get a high pitched whining noise with RPMs over 2400. That whine disappeared when I bypassed the aftercooler.

I did 4 trials. The results are in the attachments. Please note that the fuel meter has limited accuracy (and capacity). But it’ll give you an idea.
Test A – My old propeller 19×16.5. With aftercooler.
Test B – My old propeller 19×16.5. Bypassed aftercooler.
Test C – New/used propeller 19×17. With aftercooler.
Test D – Steel propeller 22×19. With aftercooler.

The steel propeller was to heavy to get on plane with and i got lots of black smoke.

[Cato Jensen]

Pictures from June. Dry exhaust section is 3.5″, wet section is 5″. Hosing on intake is 2.5″.

[Cato Jensen]

Thanks! I am away for the weekend, but i’ll record better numbers for EGT after I return. I’m thinking of bypassing the swac for comparison.
I cannot guarantee that the turbo has newer been exposed to water. It’s a repower by PO and i never saw the previous installation of this engine. It was used, and from an commercial boat with gear.
Exhaust elbow is new, previous was no good design.
Maybe I’ll pull the turbo and inspect the exhaust housing.

[Author]

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