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muffler

Philpott

Philpott

Cal 2-27 Dura Mater
10 miles out of Half Moon Bay my engine sounded different. I turned it off and crawled into the cockpit hatch to see what was wrong. "Thank goodness there is no wind" I said to my boat. My muffler had blown up. I thought diesels liked to be driven. I disconnected the clamps and put the unit into the cabin. When I was again in the quiet cockpit I said to my boat "Oh, there is no wind, it's a sail in the fog for us, honey". So we sailed at about 1.7 knots and never saw land, and the fog at the entrance to the gate obscured the towers. I could glimpse the bridge through the fog as I sailed under it. Now that was cool. Thank you, MX Mariner'
 
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1) It's always the engine.

2) You talk nicer to your boat than I do to mine. MUCH nicer.
 
Turns out it was the doohicky that provides water to the engine. No, not the water pump, because that's brand new, right.? It's a vetus something, plastic. Tomorrow I'll sail it over to the marine center and all will be revealed. I think there's an impeller in their somewhere, so says my brother.
 
"You're killin' me Smalls!"

That's the lift can - it cools the exhaust before sending it out through the exhaust hose. The impeller is on the water intake side - it pushes the water into the engine.

Until you put the lift can back on, make sure the transom exhaust hole stays above the waterline!

KKMI does classes on diesel engines. I think OCSC does too now and then. Just a thought . . .
 
Can't we have a transpac seminar on diesels? At a marina!! ?? Or just an SSS seminar? I'll bring all the food. And donuts.
 
Sounds like a good idea. What time did you get out of HMB. I took off at 0600 and there was no wind for at least two hours.

Too bad about the diesel exhaust system. There is a lot there that can go wrong. A class would be a good idea.
 
Engine Cooling Issues

Jackie, I think Bob's idea of a diesel is a good one. It's more complicated than a 2-hour panel discussion at the OYC. In addition to the cooling system, there's the fuel system with its filters and injectors (and how to bleed them). There's also the electrical system, which for a diesel might be simpler than for an gas engine - if you can hand crack the thing to get it started. It doesn't need electricity to run; that's why the "kill switch" closes off the fuel supply instead of disconnecting the battery.

A simplistic look at the raw water cooling system: It's an open loop, with one end being the intake sea cock somewhere in the bilge under the engine. From there a hose to the raw water pump, which forces the water through the engine block and head to cool it - there's usually a thermostat in there to control the flow and keep the temperature regulated.

After the water passes through the engine, it's introduced into the exhaust gases in the water lift (the plastic flower pot you mention). The combined exhaust gases and cooling water are expelled through the exhaust fitting on the transom.

Each one of these elements can fail. There are several severe results of that failure. 1) The engine will overheat, seize up, and be destroyed. 2) Without the cooling water being introduced, the 1000 degree exhaust gases will melt the exhaust hose, filling the boat with exhaust gases and water entering from the transom fitting. 3) Since it's an open look: ocean-to-engine-to-ocean. If some fitting/hose/water lift fails, you'll sink. The sea cock on the intake will close off that end. The exhaust end doesn't have a sea cock, so if something fails after the cooling water exits the engine, things can get serious very quickly. If a hose fails, the water pump will continue to do its job, filling the bilge. If the water lift, exhaust hose, or the clamps holding the exhaust hose to the transom fitting fail, there's the possibility of water entering the hull that way, especially with a following sea.

When I sailed a boat with an inboard, I kept a wooden plug sized to jam into the exhaust fitting on the transom. In a Coastal Cup race when my water lift failed (and it was stainless steel) I used that plug to keep water out from off the Sur Coast to Catalina Island. Needless to say we didn't motor any of that distance! Sometime I'll regale you with all the ins and outs of that story.

So, while you're getting the water lift replaced, be sure to check out the entire exhaust system, including all the clamps and the hose. In an old boat, all of those things probably need to be replaced. And, don't forget to service the intake seacock and check that hose and clamps.

Pat
 
Thanks, Pat. Today's task: remove the cover of the brand new water pump and check the impeller. Several great step by step instructions online with photos. I will also buy extras w gaskets to have onboard. Keeping a wooden plug for that transom opening is an excellent suggestion. I'd love to hear that story sometime.
 
Speaking of hand crank starting: There was a cool moment in the Southern ocean, aboard one of the Vendee Globe 60 footers. The skipper had run the batteries down and could not start the engine. He wrapped his main sheet, with the help of a few blocks, around the engines main belt pulley. Set the engine up for starting, then did a jibe in the roaring 40's wind and the force on the sheet spun the engine over and he was back to charging batteries with full electrics operational.
 
Yeh, and a good thing he didn't get caught up in the sheet as it flew out. Big splash!
Jackie, yes, spares are very important, as is the knowledge to make the repair should it occur while sailing/motoring. Be careful not to nick the gasket and make sure the bolts holding the cover in place are secure. If it was the "Vetus something" however, it's on the out-flow side of the system. If you're pumping water, it shouldn't be the pump.
Pat
 
I have learned how to check the water pump's impeller. That was working fine. What caused Dura Mater's engine to overheat was that the thermostat was corroded shut. Yup. And so today I spent 1.5 hours contorted in my port lazarette while I unscrewed the old thermostat. I did it by touch since it is obscured by pesky engine parts and wiring and etc. Yikes. The conclusion (by all) is that it is probably the original thermostat and it is a good thing I discovered it now. Yeah, right. I wish I'd discovered it in the bay instead of offshore in the dense fog (if I'm looking for sympathy from this crowd I know I won't get it), but that's just the way it goes sometimes.
 
BobJ said:
That's the lift can - it cools the exhaust before sending it out through the exhaust hose. The impeller is on the water intake side - it pushes the water into the engine..
Click to expand...

I bought a new one and installed it. On Wednesday, returning from Clipper Cove w my friend Jocelyn, I realized that no water was coming out of the exhaust. Turned off the motor, floated with the flood into the Berkeley marina and my slip on O dock under sail. It took 2 hours, but it was a lovely balmy night. We decided to call it an adventure, though when the smoke billowed out, she was keen to use the fire extinguisher. The flange on my (new) Vetus waterlock melted. Now I'm thinking that my engine woes might be due to a clogged/dirty/malfunctioning heat exchanger. Who knew I had a heat exchanger? The manual knew. So today that's what I'll be doing. Finding it, removing it, and looking it over. Monday I'll meander over to the Berkeley Marine Center. I'll sit outside on the bench holding it and several people will give me several different bits of advice. Sort of like this forum. O Dock Slip 212. I have strong coffee capabilities on board.

Later: Can't find anything that looks like a heat exchanger on my boat. Universal M15; should be there, yet it is not. Any thoughts?
 
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It's sea water cooled like my Yanmar 1GM = no heat exchanger. See the link. Most of the time you'd be right though - most are fresh water cooled.
http://www.marinedieseldirect.com/universal/200157/universal-owners-manual-m-15-specifications.html

Your new impeller might have had a problem. I had one where the metal core separated from the rubber part and it was spinning but not pumping. Since you've had it out before, take a look at it. Without cooling water, the engine probably got so hot it melted the flange on the plastic lift can.

I'm really, really sorry about your engine problems. I hate engines.
 
Thanks, Bob. Please note that on the bottom image you sent it includes and refers to a heat exchanger. What's all that about? There is nothing like that (nothing!) on my engine. I know because I just crawled out from under my cockpit to take another look. I am so grateful when my engine runs ("oh thank you!thank you!" I say to it.) When it does not, I am grateful that I can raise my sails because YES! I have a sailboat. And I never NEVER sail near a lee shore from which I cannot sail away.
 
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So it does - I just looked at the list at the top and saw "Sea Water Cooled" in the right-hand column.
 
One other possibility, Jackie: I assume your engine is of comparable age to mine (1980 Volvo MD7A). My water pump was getting so worn (i.e. clearance around the impeller) that it wouldn't generate enough suction to prime itself and start pumping. A new impeller didn't help. The last couple of times I sailed, I had to disconnect a water line and fill the system from the dock hose while the engine was running. Then I could shut it down and it would pump water if I restarted the engine a few minutes later. But at the end of the day, coming in to the slip, nothing.

Over the last couple of weeks I disassembled the pump, machined the bottom of the impeller chamber flat, and machined an equal amount off the sealing face to keep the depth the same. I also installed new shaft seals. Saturday it went back on the boat and - after some worrisome dry running - it started gushing out the exhaust. Gushing, I tell you! Very satisfying.

So a new or rebuilt water pump may be what you need. If you take out the impeller and can see or feel irregular wear in the back of the chamber, I bet that's part of your problem.
Max
 
That word: Gush. I long to see it. Sadly, I have a brand new shiny Oberdorfer pump. I'm thinking it might be that my water strainer (very cool, very old bronze perko) had a leak so there is no pressure. Having spent 4 hours below deck on Friday removing it and checking all the hoses, I removed that also. Again. Next I'll go to Svendsen's for a modern strainer. Did I mention that I checked all the hoses? There are a LOT of hoses between the thru hull and the exhaust in the back, all in very inconvenient places. When you say you had "some worrisome dry running", how long was that? 2 minutes? 5 minutes? For how long were you worried? Because my engine runs great. I just don't want to burn it up while testing it. And I'll check that impeller again, too. Thanks, Max!
 
Philpott said:
When you say you had "some worrisome dry running", how long was that? 2 minutes? 5 minutes? For how long were you worried?
Click to expand...
At least 5 minutes. After the last South Beach race, I started it outside the marina when we were ready to drop the main, and we got into the slip without the alarm going off. And I could hear the exhaust echoing in the dry muffler. Saturday, after installing the pump, I ran it longer but I could hear some gurgling and there was an occasional feeble spit out of the exhaust. So it wasn't totally dry. I think my Volvo is a big lazy hunk of cast iron, and it doesn't get hot very quickly.
 
That is very helpful, Max. Thank you. I'll try the hose directly into the engine first to isolate the problem. If water comes out of the exhaust I'll work backwards. I'm thinking it must be the water strainer seal. Five minutes. Wow. That's a scary long time. Terrific to hear that the issue has been resolved for Solar Wind.
 
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