Pulled her, have a project to work on….

aero3113 · October 1

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 · October 1

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 · October 1

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

aero3113 · October 1

@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 · October 2

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

aero3113 · October 2

@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 · October 2

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 · October 2

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 · October 2

Any idea why you would have so many bad valves?

Ian · October 2

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 · October 2

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 · October 3

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

aero3113 · October 3

No @PickleRick, manifolds are good.

PickleRick · October 3

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

aero3113 · October 3

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

PickleRick · October 3

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 · October 3

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

PickleRick · October 3

My memory sucks.

rasbury · October 3

PickleRick said:

My memory sucks.

CRS is a terrible disease..

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Pulled her, have a project to work on….

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