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Old 05-09-2012, 17:42   #31
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Re: How Can I Make Sure the Engine is OK?

Very motivated seller. Willing to work hard to "fix" the engine
New oil - someone did that...
Overheating engine
No gauges

Don't love the boat until this is sorted or you have 12 grand laying around...

Your engine guy can only tell so much and that is depending on how far he goes to investigate. An engine not in operation for a while could have something as simple as water system clogging. Or it could be another ball game entirely.

Factoring in 12 grand off the price for an overhaul sounds great from a buyer perspective but not so great for the seller.

The good news is you have a dialog going with the seller and he seems cooperative.

There is a night and day difference in enjoying a boat with a smooth, quiet and reliable engine vs. one you are constantly chasing problems on.

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Old 05-09-2012, 17:43   #32
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Re: How Can I Make Sure the Engine is OK?

Given that the engine is the single biggest expense on a boat it may be prudent to spend the money for the hour or three a qualified mechanic will charge you to check your engine over, Especially if you know zero about diesels. Make sure you get a reputable one.
Do another engine sea trial and take him along so he can asses the engine in real conditions.

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Old 05-09-2012, 18:04   #33
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Re: How Can I Make Sure the Engine is OK?

An engine surveyor must at least do a compression test. A leak down test at top and bottom is far better but at least a compression test will pull out gross problems. A bore scope would also be nice. Pop testing the injectors would also be a good idea.
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Old 05-09-2012, 20:39   #34
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Re: How Can I Make Sure the Engine is OK?

The Yanmar manual mentions loose belt for driving pump, loose hose of pipe letting air into the cooling system, worn water pump (bad impeller) dirt in cooling system and defective thermostat that does not open. These items are easily checked. Check for water in the oil by using a little pump the draw oil from the bottom of the pan through the dipstick hole. The engine can be direct seawater cooled, or a closed cooling system with a heat exchanger. Heat exchangers can scale up with gradual decrease in cooling efficiency. This can be cleaned with wire brush and compressed air. The coolant could also be low in a closed system. By the way, how did you determine that the engine overheated? Did it overheat almost instantly? What model is the engine and how many cylinders? If multiple cylinders then a blown head gasket will let water into the oil and cause exhaust gas in the coolant, which looks like overheating. This “over heating” from exhaust happens very fast before the engine really has time to warm up. A thermostat stuck closed will also overheat very quickly because the heating is local as will a broken water pump belt. If the engine really was hot to the boiling point, but sufficient water was there to cover the metal parts in the head, then most likely no damage. The question is was there coolant in the engine when it cooled down? Cracks in the engine will also cause exhaust in the cooling system. A pressure test of the cooling system will check for this using compressed air put into the cooling system to check for cracks. Also you can buy a tester for carbon dioxide (these are cheap, about $15) that is hooked to the cooling system, probably with the takeoff from a hose at the exhaust manifold. Go down the list in the following order until you find the problem. I would check belt drive for the water pump, then the impeller in the water pump, the raw water intake by checking the water output from the water pump, next the thermostat, water in the oil, heat exchanger if closed system, carbon dioxide tester, then pressure testing. A compression check showing low pressures in adjacent cylinders points to a blown head gasket.

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