MTU Series 60 Won't Rev Over 1500 RPM

Now that’s a checklist! I will look at what I can and use it with when I can get the MTU tech down to the boat. Thank you

MTU tech is coming Monday

The issue seems to be the paper gasket between the charge air cooler and the intake manifold is leaking air. The lack of boost puts the engine into smoke mode restricting fuel.

Interestingly the starboard engine has a small leak in the same place. It explains some soot I was wondering about near the front of the intake on that engine.

Waiting on the quote and schedule to remove, clean the CAC and replace the the gaskets with metal ones now standard. Need to do both engines.

Might have the valves checked at the same time.

While there is room to work on both sides of the engine moving the large parts around won’t be easy. Planning to help the tech move the parts. There seem to be cutouts in the engine room ceiling. Wondering if anyone knows whether these are ‘cut here’ lines or screwed down access. The carpet is being replaced in the fall, never the same after we pulled it up to install the seakeeper, so not worried about that. Hope making access easier will save time/money on the repair.

I will have them check bulletins. It was comforting that was a likely cause on PacBlue’s list.

Interesting you mention starters.... Heard the Stbd starter grind when starting. I don’t normally have the engine hatch open when starting. Installing a reman starter while access is easy with the CAC box out.

Boat is running well now. Both engines turning up just below 2350 rpm at 98-99% load with nearly full fuel, full water, all our stuff and a lot of tools. It was an eye opener to see the size wrenches the tech used. What was done:

1. Charge air cooler to intake gasket replaced
2. CAC matrix cleaned
3. Valves adjusted
4. Valve cover gaskets replaced (2 per engine)
5. Port exhaust gasket replaced and turbo cleaned
6. Starboard starter replaced
7. CAC bolts replaced with longer bolts and an extension sleeve to increase clamping pressure on the CAC gaskets between the cover and the basket.

The really careful cleaning of all gasket mating surfaces was something else I did not expect. He practically polished the intake gasket surfaces before applying silicone to the metal gaskets replacing the old paper ones.

Picture of the bad intake gasket on the port engine.