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  Topic Review (Newest First)
09-28-2012 06:53 AM
Re: How to destroy a diesel in one easy step...

Oil pressure failure is probably the single most destructive event.
Install an audible alarm - you can easily build one yourself from an old automobile relay and automobile horn. Last one cost be about $6 in total, in 1995, and it is still workingfine.

Overheating is next, I suppose. Keep an eye on your motor coolant temperature.

On the point of timing belts. Do not install a marine diesel with an OHC engine. Simply avoid the type. Install an OHV motor (pushrods). Marine diesels do not rev high enough to justify an OHC motor. Avoid. Leave the type for motorcycles, or performance automobiles.

Keep the oil clean.

Be careful with prolonged cranking.

I made a decision a long time ago to remove the engine side covers so I could keep an eye on what was happening in there constantly. I have the luxury of instant access to the motor and I can check the vital signs before they get out of hand. You would be surprised what a wee bit of constant TLC can do.... hand on gearbox to check temperature, constant checking of engine mounts, hand on cylinder heads, on the exhaust elbow, hand on the electrical fuel pump to check it is working, and a big oil pressure gauge staring me in the face. I can even tell when I need an oil change - it drops below 30 psi on a long run.

Also, with the engine exposed perhaps I can get an earlier warning of a fire in there? Perhaps.

09-28-2012 12:33 AM
Re: How to destroy a diesel in one easy step...

Originally Posted by arf145 View Post
So this happened to you? Did it completely kill the engine?
It's not likely that filling (and running) a diesel with gasoline would be fatal. I used to work for a private ambulance company and all our ambulances were diesel and most of our crews were inexperienced (high turnover) and sleep deprived because of our 24 hr shifts.

Many a diesel rig was fueled with diesel and driven away. Apparently it makes sounds that aren't so good.... but it never destroyed one that I know of.

The procedure was for the company's mechanic to invent new names for you and try them out to your face. He then would drain the fuel system and pull the head of the engine. Apparently the gasoline would all evaporate and he could just put the head back on, refill the system and carry on. He always said that putting diesel in a gas engine was worse because it wouldn't evaporate. This was also the reason, he said, that at the pump the diesel nozzle won't fit into a gas engine's fill port but a gas nozzle will fit into a diesel fill port.

09-27-2012 11:26 AM
Re: How to destroy a diesel in one easy step...

Another tricky one...
My Volvo MD2020 started overheating, at the point of stalling. It ran fine for years. I tried today to repeat the event at the dock, without actually stalling. Guess what?! The heat exchanger cap is busted...or something. After running the engine in gear for 15 min. at 2500 rpm, I noticed a trickle coming out of the heat exchanger overflow. Spatten Octoberfest bottle was right there, so I commandeered it to act as an overflow container.
It started filling up slowly, but when I slowed down to an idle, the overflow started gushing, and dumped about half a quart... So, the engine is losing its coolant... A friendly lobsterman suggested bad heat exchanger cap... I was looking at it and thinking to myself.... this piece of spring and rubber could kill! And not only the engine, but the people on board, in the right circumstances...
06-09-2012 04:20 PM
Re: How to destroy a diesel in one easy step...

Originally Posted by davenewhaven View Post
Not watching the dock boy fueling your deisel tank with gasoline.
So this happened to you? Did it completely kill the engine?
05-12-2012 03:44 PM
Re: How to destroy a diesel in one easy step...

Have your transmission seize outside of Ensenada on the way to Baja Naval for a bottom job.

Have the folks at Baja Naval remove the transmission and send it to the states to be rebuilt.

Have the folks at Baja Naval reinstall the transmission with the pressure plate installed backwards.

Run the engine for 16 hours.

Result 1 seized Yanmar 4JHE.

Try to get to the friendly folks at Baja Naval to cover the cost of the rebuilt diesel - fruitless.

Repower the boat with a new Yanmar 4JHE - a few thousand more then rebuild.

Marc Hall
Crazy Fish, Crealock 37, Hull 207
05-12-2012 02:15 PM
Re: How to destroy a diesel in one easy step...

Originally Posted by davidpm View Post
I just had a long conversation today with an experienced diesel mechanic and he said it is important to mix coolant 50/50 before putting it in the engine. He said if you pour in one gal of straight coolant the a gal of water it will not mix properly in the engine and the engine can rust and or freeze.
I thought that was not obvious.
What if you pour in a quart of coolant, then a quart of water, then a quart of coolant, then a quart of water, then a quart of coolant...
05-12-2012 06:38 AM
Re: How to destroy a diesel in one easy step...

Running your engine with a bypass oil filter system. Take it out before it springs a leak and you destroy your engine while running with insufficient oil pressure.
05-11-2012 11:27 AM
Re: How to destroy a diesel in one easy step...

Hi all,

The boat I just sold was prevented from overheating in the following way by the previous owners:

After forgeting to open the cooling seacock and causing some damage, they ALWAYS put the ignition keys on the handle for the seacock. That way you could not start the engine without touching (and opening) the cooling water. I adopted their practice and never forgot to open the cooling line before starting the motor. Also, I replace the impeller every year. Very cheap insurance against some of the problems discussed here.

Cheers, Bill
04-25-2012 07:30 PM
Re: How to destroy a diesel in one easy step...

Treat it too good by running at low rpm. With a Yanmar, This will surely result in glazed piston walls and a low hour smoker requiring a hone and re-ring...ding, ding, ding.
04-07-2012 06:02 PM
Re: How to destroy a diesel in one easy step...

Originally Posted by erps View Post
It was a little Kubota 2 cyl (Westerbeke). We sailed it into Bellingham, where I mocked up a new alternator bracket out of cardboard, took it to a local machine shop and they had a new replacement bracket cut out in about a half hour. Then I marinetexed the the timing belt cover back together and ran her that way for another four years.
Westerbeke / Universal takes Kubota engines, and marinizes them.. The Universal M25 was notorious for shaking the alternator, leading to a crack in the timing case and oil in the bilge

The whole story is listed here..
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