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CATEGORY LISTINGS > MAINTENANCE / SERVICE > 5000 Hours - Injectors not checked - No Valve Adjustments? [ REFRESH ]
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5000 Hours - Injectors not checked - No Valve Adjustments?


Created On Thursday August 12, 2010 19:05 Diesel Talk
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Vcoast
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Joined: Aug 2010

Note Thursday August 12, 2010 19:05 View thread in raw text format
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Is it possible no ill effects to engine wear would have occurred if valves settings and injectors have never been checked during the first 5000 orig. engine hours?

I'm looking at buying a lobster boat with a 1998 Isuzu 6500 series turbo charged diesel 6Cyl engine. Makes between 165-185bhp. The engine has about 5200 hours. As looks go, still very clean for being on a lobster boat. The owner tells me the oil is changed every 100 hours, along with the filters, and he's been meticulous about where they buy their fuel.

But, in over 5000 hrs., no one has ever pop tested the injectors, or checked the valve settings. The original company that marinized and mfg.'d the engine tells me the recommended maintenance for both is every 1000 hours. A local diesel shop recommends every 2000 hours. as this is a rugged engine. The local shop guy says he'd replaced all 6 injectors, just due to the number of hours. The manufacturer tells me these engines can go 30,000 hours, however, that's only when the regular maintenance has been done along the way, which has not been the case here.

We took the boat out for a sea trial, and everything seems to run fine. There was only a little vibration at a very low idle, but a little kick to the throttle, maybe a 100 rpm ends it. No way to tell if that is inherent to the engine, or just a one of those goofy harmonic wave things that affects the whole boat. It's really minor, and hardly worth mentioning, then again...is vibration at low idle a sign of anything? This is a dry stack exhaust, and keeled cooled engine system, so the exhaust stack exits above the cabin house and easy to see what's coming out, no black smoke, bad smells, or anything unusual through the whole power range.

How concerned should I be about possible detrimental effects to the longevity if the valves and injectors have never been checked up to this point? Is it really possibly both could be perfect after 5000 hours? I've been told, poor injector spray patterns can cause hot spots in a cylinder. Regarding valves, I'm not sure how problems start to manifest, I suspect fuel economy, performance, pinging, nailing are all on the list, but these don't seem to be an issue.This engine sips fuel at 1 Gal. hour @ 2000 rpm, so, how out of whack could injectors or valves be without noticing it in performance, fuel consumption, audibly or visually along the way?

I took an oil sample and sent it off to a lab, and still awaiting the results. Any input would be greatly appreciated.
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desertstormboy
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Note Friday August 13, 2010 22:25 View users profile View thread in raw text format
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vcoast, you seem very knowledgeable and your doing your homework before the buy. good for you. at 5000 hours with no sign of damage, rough starting, or poor performance, it would seem everything is ok as of yet. if you are interested in the boat, in my OPINION i would purchase it and maybe make a deal with the seller to go in half on the adjustments and a formal checkover. if he is really interested in selling it, the seller probably would agree to it. If not, shop around and find out what the locals would charge to do the maintenance that is required before the purchase.

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IT WENT BING BANG BOOM!
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Vcoast
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Note Saturday August 14, 2010 07:48 View thread in raw text format
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Thanks for the input DSB. Have you seen this situation before, do these engines, or any engines really run this long without any detrimental effects for 5000 hours, having never had the injectors or valves checked or adjusted?

Edited: Saturday August 14, 2010 at 07:49 by Vcoast
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