Pulled her, have a project to work on….

aero3113

captkevin said:

Wow that is alot scale. Be interesting to see how much better it runs.

I think it will help a lot. When I was cleaning it out, I could feel that I was opening up the areas. I’m sure there wasn’t any flow there.

aero3113

I heard back from the machine shop. Aside from the damaged valve, they found a bent valve as well. I asked if it was the #1 cylinder, he’s going to ask his worker who disassembled it. I prepped and painted the intake this morning. I also had a new MAP sensor that I never used so I replaced it. It looked pretty gummed up so was probably ready to be cleaned or changed.

captkevin

You going to pull the heads off the other motor to check?

aero3113

@captkevin , the starboard motor has been running good. I do know that the heads were replaced on that engine before I bought the boat.

Ian

How many hours you have on those engines? Can you read the hours per RPM range off the ECM?

aero3113

@Ian yes, I can read the hours per RPM range. I looked a couple months ago but didn’t write down the information. About 350 hrs since they were rebuilt.

aero3113

The heads are finished, I’m going to pick them up on Monday. Machine shop said I had a total of 4 valves that were bad. He couldn’t tell me which heads they were from because they only found out while they were cleaning them. 

rasbury

PickleRick said:

With enough money one could install closed loop cooling along with aluminum heads/intake/block 

When I went shopping for our 270, 1st was has to be closed cooling and 2nd was the genset. Number 2 has not paid  off.  I'm not sure it would be "with enough money" to get there. Would be an interesting  project to look at. Two motors those does present a multiplier. 

captkevin

Any idea why you would have so many bad valves?

Ian

captkevin said:

Any idea why you would have so many bad valves?

That’s why I asked about hours per RPM range. I have 800 hours on my twin 5.0 MPI’s with no major work (so far). But my hours above 3k are fairly low. I think @aero3113 runs high a lot.

aero3113

captkevin said:

Any idea why you would have so many bad valves?

It all could’ve happened when they ate the spark plugs. But when that happened only 2 plugs were bad. 

PickleRick

Didn't you have a manifold that was beginning to fail?  Perhaps hot valves didn't appreciate cold water ..or salty water 

aero3113

No @PickleRick, manifolds are good.

PickleRick

I thought you had replaced manifolds previously as you heard an audible change to the motor or was this your previous boat?

aero3113

Wasn’t me @PickleRick . Wouldn’t there be visible rust on the valves if the manifolds were leaking?

PickleRick

For some reason I thought I sent you those 3/8 rods to change the manifolds on the 342 not long after you got it. 

A minor leak in the manifolds, not enough to cause water in the oil, could cause corrosion/deterioration of the valve and or valve seat.   

I thought you had gotten them as you started to hear an audible or felt a difference in performance.  This could have sped up the wear of your valves.  

aero3113

@PickleRick , when you sent me those rods, I changed out the manifolds due to corrosion. (it's a 330)

PickleRick

My memory sucks.

rasbury

PickleRick said:

My memory sucks.

CRS is a terrible disease..