[TheForge] costs of ownership question

[Charles]

Terry, 


You need to find out what the normal service interval is for this unit or at 
least what others are getting.  There are bad designs out there, but there are 
even more bad or inexperienced mechanics.   I am not an expert on marine 
engines, though I have several engineering tomes on them, largely because I have 
an interest in aviation engines which also suffer from torsional vibration 
issues.   My understanding is that traditional marine diesels tend to be long 
stroke and have longer rods which should reduce the tendency to egg the 
cylinder.  What you are describing I think usually comes from bad fuel, air or 
oil filtration or problems with the piston ring installation.   Often oddball 
engines like this have special considerations in how the rings are fitted and 
installed and they may not look right to a mechanic not familiar with the 
brand.  Install them wrong and the lubrication in the engine goes to the wrong 
place. 


Charles




________________________________
From: terry l. ridder <terrylr at blauedonau.com>
To: Blacksmithing List Sponsored by ABANA <theforge at mailman.qth.net>
Sent: Tue, September 11, 2012 11:28:44 AM
Subject: Re: [TheForge] costs of ownership question

hello ron;

On Tue, 11 Sep 2012, Ron Childers wrote:

>
> Only 500 hours for a diesel is ridiculous;
>

500 hours.

>
> Did you mean 50,000?
>

No.

>
> What kind is it?
>

they are some southeast asian make during the late 40s or early 50s.
WWII vintage. they could be newer just that era of design.

we normally can get parts for them from either south korea, japan, or
taiwan.

the oddest suggestion that i have heard so far was from an old marine
mechanic; that the auxilary diesel engines are located in a higher
than normal magnetic field perhaps due to parts of the ship being
magnetized over the years.

the piston moving in the magnetic field is generating it's own magnetic
field and currents. which is causing the piston rods to bow ever so
slightly. this slight bow in the piston rods is causing the cast iron
sleeves to wear out-of-round. the old marine mechanic suggested that i
have the entire ship degaussed. needless to say that is not going to
happen anytime soon. degaussing a ship is not cheap by any standard.

the longer the piston rod the more the rod would have the ability to
bow.

this old marine mechanic suggested that if possible rotate the mounting
of just one of the engines 90 degrees and see if the wear on the cast
iron sleeve also rotates 90 degrees. he said that would point to
external magnetic fields causing the excessive wear on the engines.

>
>

-- 
terry l. ridder ><>
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