[bronk33]

Hey everyone!
I have a 1973 Pearson 30 with a yanmar 3gmd.
I took a long trip a few months ago. Had to motor sail half the way back.
Well, the alarm wasn't plugged in so I didn't hear the motor was overheating (impeller damage).
Not exactly sure how long the motor was overheating, but it did damage. I'm surprised it didn't blow up.
The sea strainer melted and the water muffler melted.
Those were the noticeable damages. Replaced both.
At this point, the motor runs but on startup a good amount of black smoke and black door (unburnt fuel) come out. If I run it at 2500-3000 Rpm for about 5-10 mins, the black clears. Until I put it in gear. Then while in gear, it will smoke and soot the entire time.
I checked the fuel lines, and changed the 3 injectors.
No change.
This has only happened after the overheating incident.
Friday, I have someone coming out to clean the bottom and check prop buildup, but that won't have anything to do with smoking and soot and startup.

What are my possibilities? I started up (for seconds) without water muffler attached and black smoke was thick. Another ailment is the motor is slow to decelerate and to shut down.

 

[bronk33]

Sorry black smoke and black soot ***

 

[aa3jy]

Hopefully I'm wrong but a top end might be advisable..sounds like warpage..or..the high pressure fuel pump is now out of timing..too many variables from high heat effects.

 

[trantor12020]

Mixing elbow choked.

 

[kd3pc]

almost always, black soot/smoke is an air to fuel mix problem....filters, blockage in the air pathway, either intake or exhaust.

These are usually cheaper things to fix, before you get in to pumps and injectors and such.

check this fully, +1 on Trantor - elbow/mixing