Overhaul Cost of a QSM11

[Curtis J McNamee]

Any idea about what it would cost to overhaul a QSM11 in place…a pair are in a Bayliner 5788 and both have 3900 hrs and high chromium content from the survey oil tests.

I know the costs can vary alot based on the condition of all the accessories, but, just trying to get an idea what a person is looking at.

Thanks for your ideas.

Topic

[Curtis J McNamee]

Thanks everyone for your input, it is very much appreciated.

Cheers,

Curt

[Philip]

Lots of posts here and other sites talking about oil analysis and how buyers have concerns.

Here is what you need to know about oil analysis – a single oil sample tells you little to nothing unless you see chunks of metal and then you don’t need the analysis. Oil samples are to identify trends not a single sample concern as there is no trend. Oil sampling can be valuable but only over a long time with multiple samples to compare them to.

If your engine starts when stone cold within a few revolutions with no smoke, idles smooth, get max rpm when heavily loaded and is under the Cummins fuel burn vs rpm throughout the rpm range (Tony’s recommended fuel burns vs rpm for the QSM) then your 99.9% assured you will be just fine and your oil sample is telling you nothing. Some engines just have higher numbers naturally. If you want to do oil sampling then you need to take a sample at regular intervals (100 hour), use the same sampling method, use the same oil/filter, and use the same laboratory. After 5 or 6 samples you will start to have some history and trends.

Stop worrying about rebuild cost and post up your fuel burn vs rpm at 200 rpm intervals from idle to max rpm and post your max rpm… that will help us help you.

Also a few pictures of the engine from all angles will help the eyes here give you any advice.

Hope that helps…

Phil

[Curtis J McNamee]

Tony Athens wrote:

Other than the Oil analysis, any other symptoms that would lead you to believe your engine needs rebuilding? Measured High blow-by, high oil consumption ( maybe over 1% of fuel used)?, very hard to start when cold ( even with good batteries) , or ???

The QSM typically does not just “wear out” unless it is being operated at 20-22 GPM load on a 60-80% duty cycle and/or it not being maintained– and then you would have to have run 75,000 ++ gallons of #2 thru it…Remember, this is a 2,000,000-3,000,000 mile + truck engine with solid roots going back to before 1998..

Tony

Hi Tony- thanks for the response…..no other symptoms and this is a head scratcher for sure. It starts right up, no smoke, normal oil consumption and fuel burn.

Could the Chromium be coming from valve stems and out of tolerance clearance with the rocker arms ??

Curt

[Tony Athens]

Other than the Oil analysis, any other symptoms that would lead you to believe your engine needs rebuilding? Measured High blow-by, high oil consumption ( maybe over 1% of fuel used)?, very hard to start when cold ( even with good batteries) , or ???

The QSM typically does not just “wear out” unless it is being operated at 20-22 GPM load on a 60-80% duty cycle and/or it not being maintained– and then you would have to have run 75,000 ++ gallons of #2 thru it…Remember, this is a 2,000,000-3,000,000 mile + truck engine with solid roots going back to before 1998..

Tony

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