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D8N engine rebuild. Couple of questions.

Nige

Nige

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Always nice to hear a success story, although it was touch and go for a while it was "All Right on the Night". :D:D
Protect your investment and get some regular oil samples from the engine if you haven't already. You need to establish a trend in the various "trace elements" present in the oil for future reference. Post any results you get here for comment.

100 hours and you should already have taken two samples - at 50 & 100 hours respectively.
 
A

Alberta Cowman

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Nige said:
I also hope you’ve already changed the engine oil & filter at least once by now.
Click to expand...
Hi Nige.

Yes I have changed the oil at 70 hrs.

I have used oil sampling in the past to verify issues such as fuel dilution previously.

With all the work that went into this rebuild I'll look at starting sampling it. What kind of schedule would you recommend?

I'm just actually troubleshooting an issue with hyd oil leaking into the transmission I believe. But I'll start a new thread on it.

Thanks.
 
Cmark

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Sampling should be done in the window between 50 and 250 hours. When in that window depends on your circumstances. If you're only running 250 hours/year then consider 50 hour samples. If you're a 24/7 operation then 250 hr sampling is appropriate.
Whatever you decide, the key is consistency. Chose your routine and stick to it give or take 10 hours and use the same sampling method every time. Fluid analysis is a trending tool and not really intended for one-off diagnosis.
 
Nige

Nige

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Wot he said........ ^^^^^^^^

The only thing I'd be doing on a recent rebuild is some early "out of sequence" samples (not changing the oil/filter though), more than anything looking for something spiked way out of whack compared to all the others. Also as a check on the Silicon numbers that the engine in not pulling dirt into the intake through a loose clip or a damaged hose. That can ruin your day big-style and in short order. Silicon should walys be in single digits as far as I'm concerned.
 
Cmark

Cmark

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Forgot to say the 250 hr maximum interval applies to engines. Power train and hydraulic systems usually recommend 500 hr sampling intervals but again, it depends on the circumstances.
 
A

Alberta Cowman

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Thanks guys.

I'll get a sample soon. It usually runs 6-800 hrs a year and 250-300 hrs on an oil change so I'll aim to do a 150 hr interval.
 
Nige

Nige

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I think I'd do it every 100 hours if you are making 300hr oil & filter changes, at least for the first couple of rounds. Then go to 150hr after that. It's surprising how fast SOS history builds up.
As I said before, keep a close check on the silicon which is an indicator of the health of the air induction system.
 
John C.

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I found the sampling period was cost effective at oil change intervals. The first oil after a rebuild is always going to have run in metal in high doses and you end up losing lots of sleep. I usually ran an engine less than a hundred hours and drop the oil. Start sampling at the next oil change at two hundred fifty hours.
 
Nige

Nige

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I agree 100% with that john. However as far as I'm concerned the early-hour samples are more to check for the presence of silicon, fuel, glycol, & water in the oil. I'm not worried about a spike in iron or copper for example. Also, given the info the engine has just been rebuilt, any good (that's a kicker right there) oil analysis lab would pick that up as normal break-in numbers and say so in their interpretation.
 
John C.

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Good points as well. I guess I never worried about those things as I knew they wouldn't be my problem on a startup and run in after rebuild. They usually showed up between six months and a year later.
 
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