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Old 07-24-2012, 09:23 AM   #1
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Source of my overheating?

Mechanic thinks this is the culprit...

included is my Perk owners / oper manual showing the 33 quart capacity.

What isnt seen in this pic is the copper tube is completely blocked in some areas and the lower riser is severly corroded. Mech thinks a hole is present allowing the coolant to enter the exhaust and thus thats where it is going.

You can see coolant resididual in the rubber fitting at top.

I am hopeful that when the engine shut down I didnt do any damage to the Head or Gasket. We will see..
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Old 07-24-2012, 11:10 AM   #2
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What does your mechanic say caused the engine to shut down.

Unless you realy do have a overheating auto shut down you are in deep dodo.
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Old 07-24-2012, 11:29 AM   #3
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Which 6.354 engine do you have?
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Old 07-24-2012, 11:40 AM   #4
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Skipperdude,

Not sure. RPM's decayed at idle speed when I was trying to bring it to dock and engine quit. This coincided with the High Temp alarm and he thinks it is possible it stalled at low rpm high temp and trying to put it into gear. Still looking for the auto shut down sensor.

Confirmed the Overtemp was likely caused by the blockage in the tubestack. Did a pressure test and confirmed the exchanger is shot.

We are trying to verify IF there is indeed an auto shutdown. I know it shut down before on the trip home after I bought it in May, when we had an overheat issue due to high RPM running and shaking out the previous rust (no pun intended) from the boat sitting dockside for so long with little usage. Mech doesnt think the gasket is blown, but will test when the new exchanger comes in. Still have residual fluid in the exchanger and no tell tales of coolant in oil or drips etc.. trying to locate more info.

G Dub, Engine is 6.354 (M) series 4 built in 85
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Old 07-24-2012, 06:16 PM   #5
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The "auto shutdown" may be when the pistons expand in their bores from excess heat.
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Old 07-24-2012, 08:23 PM   #6
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RW, I hope not. I understand what youre saying and yes it is possible. Mech doesnt think so and one possibility is the aftermarket Fire Suppression Halon system in my engine room. It requires a Auto shut down for low oil and high temp.... it may be installed. I havent had a chance to look any further into it due to limited time. One thing in my favor, these are pretty sturdy engines and yes even forgiving and in the 27 years of its service I am not the first to overheat it. It was at idle RPM when I was attempting to dock and wasnt run for longer than 15 minutes before it shut down. So there is a very high probability I dodged a bullet.
the conditions of the tube and the elbows shows the poor maintenance the engines suffered and I am determined to make them right.
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Old 07-24-2012, 08:25 PM   #7
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I dont mind the chuckling at my expense. ;-)
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Old 07-24-2012, 08:47 PM   #8
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I dunno who is chuckling but it sure isn't me. My experience has been if it gets hot enough to shut down then likely I'm gonna have to get out the chequebook. Hope that's not the case for you.
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Old 07-24-2012, 09:03 PM   #9
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I know Bob, Im hopeful that no damage was done. Heat Exchanger alone was hard to find and I have to get custom manufactured elbows... Luckily the track record for these Perkins is very good. Its a crap shoot and I wont know until I get the engine put back together. I am optimistic.. I noticed the Temp climb and reduced the RPMS to Idle for the trip in and the temp alarm didnt sound until I went to dock the boat and then it wasnt audible for long. I am a believer in these cast iron motors.
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Old 07-24-2012, 09:15 PM   #10
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I'm glad your were at idle. Nothing nicer than new stuff to bolt on. If you do have to replace the head gasket than you will be able to check out the cylinder walls and see if there is any damage. Good luck, looks like were both chasing gremlins.
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Old 07-24-2012, 09:23 PM   #11
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Thanks Swampu
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Old 07-24-2012, 09:37 PM   #12
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Swampu, what is the gremlin your hunting?
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Old 07-24-2012, 09:39 PM   #13
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BH,
Have you spun the engine over by hand (with a pull bar) since the shut down? This might give you a little peace of mind if it feels smooth. If you seized a piston you would know for sure. It's a PITA without the correct tool, but you may want to cut the engine oil filter open and spread the pleats out and inspect them. If this is clean, these are indications you are probably OK as you wait patiently on your parts!
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Old 07-24-2012, 09:43 PM   #14
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Fork,

I have not. Great Idea.
Good call on the oil filter.. I should see metal if I have an issue right?
so far oil looks good and not increased in level or in consistency, now to open the oil filter..
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Old 07-24-2012, 09:53 PM   #15
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Yes on the metal. It's actually done more to look for a rod/ mainbearing starting to fail but I would think If you actually had a galled piston you might see an indication I the pleats. I don't have a filter cutter but will one day. We had one when I worked for the Cat dealer and it operates sort of like a copper tubing cutter. I usually put the filter in a vice and use a hack saw or SawzAll and cut the end of near the threaded base. Pull the pleating out and inspect a section of it for any contaminates. I sometimes use a magnet to confirm it is metal. I REALLY don't think you will find anything. Those old Perkins are rugged!
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Old 07-25-2012, 08:58 AM   #16
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Fork,
thanks for the idea. We'll see how it goes. I am pretty optomistic..
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Old 07-25-2012, 09:04 AM   #17
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Quote:
Originally Posted by Blue Heron View Post
Swampu, what is the gremlin your hunting?
My issue is the transmission. I lost pressure and foward gear. Checked a few things and pulled the transmission for a rebuild. The boat was in a fire and the transmission was about ground zero, thus I thought the seals were bad. Got the thing back, bolted it on and boom, still no foward gear. Now I have taken the pump off to have it looked at. Some of the trash from the fire may have gotten stuck in the bypass. Expensive lesson but I did get a rebuilt trans out of the deal. I should have hired the mechanic before I pulled it out but I was trying to do it myself. At least everyone is in agreement that the rebuild was probably for the better, because the seals would have had some damage from the fire.
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Old 07-25-2012, 10:46 AM   #18
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Do you have velvet drives?
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Old 07-25-2012, 04:39 PM   #19
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Do you have velvet drives?
No I have the allison with the external pump. Great big transmission. Hell great big pump too. Oh yea buy the way the pump was shot. Bad bearing for a long time make bad shafts. Guy even said it looked like it went underwater.
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Old 07-25-2012, 06:07 PM   #20
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Swampu
You gonna be up and running soon?
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