DieselEngineTrader's FREE Diesel Engine Forums

new topic search Categories login View Isuzu Engines

CATEGORY LISTINGS > ISUZU > Injectors & Valve Lash maintenance - how important? [ REFRESH ]
Thread Title:

Injectors & Valve Lash maintenance - how important?

Created On Thursday August 12, 2010 18:40 Diesel Talk
Diesel Talk Forum

Diesel Talk Forum
Posts: 3
Joined: Aug 2010

Note Thursday August 12, 2010 18:40 View thread in raw text format
Diesel Talk
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 have been meticulous about where they buy their fuel. While the boat itself is older, the general condition is good, and just looking around, there's no reason not to believe the owner regarding the regular oil and filter changes.

Here's the rub, in over 5000 hrs., no one has ever pop tested the injectors, or checked the valve adjustments. I've contacted the original company that marinized and mfg.'d the engine and they tell 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 later tells me he recommends replacing all 6 injectors at this point, 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.

So the question is, 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 they could be perfect after 5000 hours? I've been told, poor injector spray patterns can cause hot spots in a cylinder. Regarding valve adjustment, I'm not sure how problems due to valve adjustment 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.

Diesel Talk Forum
Reply Diesel Talk Forum Quote Diesel Talk Top Diesel Talk Forum Bottom Diesel Talk
Diesel Talk Forum
Diesel Talk Forum

Diesel Talk Forum
Posts: 30
Joined: Jan 2010

Note Saturday January 18, 2014 19:10 View thread in raw text format
Diesel Talk
I'm sure you have made a decision by now, but I would not let that bother me. Tough engines. Should go 30,000 as they say. Replace injectors, and do the 1000 hr maint. every 1000 hrs.

gregory l ralyea
Diesel Talk Forum
Reply Diesel Talk Forum Quote Diesel Talk Top Diesel Talk Forum Bottom Diesel Talk
Diesel Talk Forum
Luoyang Diron Parts Trading Co.,Ltd
Big Bear Engine Company
Select Reman Exchange LLC
Diesel Sales
Young & Sons Inc.
Advertize on Diesel Engine Trader

Customer Testimonials


Subscribe to our mailing list to get all the latest DET news.as well as daily or weekly notifications of new engines and spare parts listings.

'The engine was on other sites, but we received the most calls from DieselEngineTrader.com. We sold it to the first caller-from DieselEngineTrader.com. Also, there was a waiting list on the engine if the first sale fell through! Thanks for the great service!'

Fran Trapp, South Carolina, USA

'We bought a new John Deere engine via DieselEngineTrader.com for a great price and were able to sell it locally for $1000 less than our competition. We really appreciate the website - it's great!'

Ben Kauffman, Quaker Machine, PA, USA

'We've sold a number of engines via DieselEngineTrader.com - even some that we've had lying around for a few years! It's very useful in getting our inventory seen by a much larger market.'

Jackie Read, A J Diesels Ltd, Southampton, UK