Cummins ISB 5.9 L Diesel Engine Cavitation

[FCoover]

Hello All:

My engine has 85K miles and has been loosing power.

My mechanic advises that my loss of engine power is likely due to coolant cavitation causing perforations of the block. He wants to try block sealants- stuff put into the coolant to try to seal the perforations from the inside.

I’m not sure what to do.

I’m uncertain that the block is perforated.

If it is, I’m uncertain that sealants will work, last or be reliable.

I’m uncertain whether I should rebuild or replace the engine and if so where and what the cost will be.

I’m uncertain whether I should just junk the rig - sell it for parts and take a big loss.

Your thoughts and suggestions would really be appreciated.

Gloomy In Glenwood

[Finance]

Get a second opinion. Are there any symptoms other than reduced power? Running rough, milky oil, losing coolant, etc?

[Chinewalker]

Get a second opinion. The 5.9 is a parent bore engine. No wet sleeves. No cavitation burns.

Look for a less greedy mechanic.

Look for problems with fuel supply, filters, air supply etc.

[Fkrel]

I would find a new mechanic if your engine cooling was cavitating it would be overheating and if your block was perforated it would be leaking coolant internally or externally but to be sure have your coolant checked for DCA addiatives and make sure its up to snuff and have your fuelfilters changed and air filter checked turbo checked charge air cooler for leaks for your power complaint.

[hohenwald48]

I don't believe the Cummins ISB engine has ever had a problem with coolant cavitation. Look for a second opinion.

[hohenwald48]

Originally Posted by Fkrel

...have your coolant checked for DCA addiatives...

I don't believe Cummins requires or recommends any DCA/SCA additives for the ISB engine. I might be wrong.

[chuckftboy]

Cylinders are not sleeved in an 5.9 and it isn't worn out at 85,000 miles. You need a new mechanic.