CAT C32 SCAC – High Inlet Manifold Temperature on Port Engine

[John Wick Travolta]

Hi all,

I’m working on a C32 SCAC installation with three engines (Stbd, Center, Port). I’ve been troubleshooting an issue on the Port engine where the inlet manifold temperature is consistently higher than expected compared to the Stbd engine, even under the same load conditions. Alarm trigger at 85C.

Here’s what I’ve checked/done so far:

• Swapped the heat exchanger from Stbd to Port – no improvement, inlet manifold temp still high.
• Installed a brand new aftercooler – no change.
• Swapped turbochargers between Stbd and Port. On Stbd, the turbo performs as expected (190–210 kPa boost at 100% load, 2250 rpm, exhaust ~650 °C, inlet manifold ~75 °C, jacket water ~93 °C).
  • On Port, with the same turbo, boost pressure and exhaust temp look fine (195 kPa / 650 °C, jacket water ~90 °C), but inlet manifold temp rises to ~89 °C.
  • Coolant flow appears normal, and jacket water temperature is stable.
  • Aftercooler is confirmed clean and pressure-tested OK.
    
  So far, the Stbd engine runs within expected range, but the Port engine always shows higher inlet manifold temperature, even when swapping known good components.
  
  Has anyone come across a similar case with C32 SCAC, where inlet manifold temps run hotter despite normal jacket water, boost, and aftercooler condition?
  
  Any insight would be greatly appreciated.
  
  Thanks in advance.

 

[ccc enterprises]

Seperate water pump,? Bad sensor? Restricted air? Bad raw water pump? May sound stupid turn boat 180 degrees ( stagnet water supply to engine, ) seen it before

 

[Coaldust]

Welcome to the HEF!!

What’s the name of your boat?
We need some more information.
Engine Serial number
Hours
Rating

Can you share the Caterpillar Performance Analysis Report from the first sea trial?

Has the Port engine always trended higher inlet manifold temps?

Have you double checked the inlet manifold temperature with a separate known good instrument?

I’m suspecting air inlet issue on the Port side. Or, instrumentation, since your exhaust temps are consistent. Are the engines drawing air from inside the engine room, or ducted? Can you post pictures of the engine room layout?

 

[Coaldust]

What happened to the OP?
I want to hear some Dubai yacht party stories.