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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

diesel engine wear

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alan

09-12-2003 03:48:07




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Is there a way to check diesel engine wear when looking at a machine to buy?




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alan

09-13-2003 04:50:23




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 Re: diesel engine wear in reply to alan, 09-12-2003 03:48:07  
thanks a bunch guys, this advice will save me a lot of bucks!



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Brokenwrench

09-12-2003 18:07:04




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 Re: diesel engine wear in reply to alan, 09-12-2003 03:48:07  
You can look at the fluids, as was posted below. Check for bubbles in the radiator once its warmed up as well as blow-by out the breather, blue smoke,or excessive smoke under load. If there is enough time(not always an option) pull some oil samples and have it analyzed. This will tell you if there is coolant in the oil,excessive contaminants,metal(from bearings or other sources). All the fluid compartments can be checked this way. $100.00 spent now on oil analysis could easily save you $2-3000.00+ 50 hours running time down the road. I would run away from a machine that the owner won't let you take oil samples from.

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Lee

09-12-2003 12:46:08




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 Re: diesel engine wear in reply to alan, 09-12-2003 03:48:07  
As the other guys said check the oil, also smell it. Does it smell like fuel, burnt or have a sweet smell that could be coolant. Check the fuel tanks to see if there is any signs of oil or coolant contamination. If you can obtain an oil sample have it tested at an oil analyis lab and look for high counts (ppm) of copper (bearings), aliuinum (pistons), sodium or zinc. There will be some traces of these as with normal operation. Like someone said check starting condition and always listen for excessive noise. Remember some fuel knock is normal. Trust you gut instinic too.Hope this helps

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Len Sholes

09-12-2003 09:04:15




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 Re: diesel engine wear in reply to alan, 09-12-2003 03:48:07  
Alan with regards to your question in my opinion here is a list of items that I would check. #1 do a visual inspection looking for oil leaks and coolant leaks.(front crankshaft seal, valve cover gaskets, leaky water pump) #2 visually inspect the block for signs of welding repairs. #3 pull the engine oil dipstick and note the level and colour of the oil also it is a good idea to pull and engine oil filter and cut it open to check for bearing material. This is not necessary if the seller has just serviced the unit. Inspect the condition of the air cleaner element. #4 remove rad cap and check coolant level as well stick your finger in it and check for signs of oil. (blown head gasket, low liners or cracked counter bores) #5 start engine and note oil pressure, listen for any unusual noises ie valves clicking, bearings knocking, etc. Observe the colour of the exhaust (pushing oil, over fueling) As you bring it up to operating temperature check for excessive pressure in the cooling system, check base pressure and once again check for external leaks of oil and coolant. Check the engine oil pressure now to see how much it has dropped with the warm oil. If a great amount it could be due to excessive bearing clearance. I hope this helps you and is the kind of information that you were looking for.

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RAB

09-12-2003 08:36:06




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 Re: diesel engine wear in reply to alan, 09-12-2003 03:48:07  
Like will it start? Does it smoke? Is it down on power? Does it knock? Does it idle evenly? Miss at full throttle? Oil pressure OK? How many hours on it? Pistons, bores, valves, guides, bearings, injectors, pump? So the answer is probably no. But you can get an idea of its condition and then guess the rest. Regards, RAB



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JDknut

09-12-2003 09:00:17




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 Re: Re: diesel engine wear in reply to RAB, 09-12-2003 08:36:06  
If it starts up quickly in cool or cold weather without heating or other assistance, that is an indication of good condition. A worn engine will start harder than when the engine is in new condition.



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