Re: Detroit diesel parts

Posted by NC Wayne on February 25, 2006 at 18:35:03 from (64.12.116.74):

In Reply to: Re: Detroit diesel parts posted by jdemaris on February 25, 2006 at 17:32:09:

Working on heavy equipment for a living I understand what your saying about preventative maintance and I agree to a certain extent. There are things that you can do, when your doing all your own work, that you couldn't or wouldn't normally do otherwise. Then there are certain things that you do as preventative maintenance that are "standard" no matter what machine or engine your working on. The first thing is to keep the machinery serviced. Just doing this can prolong the life tremendously. I spent 6 years in the Navy where I saw pumps that never gave a minutes problem torn down and "inspected" because a certain PM time interval ran out while the one next to it was vibrating and acting up but it's PM cycle wasn't due yet. That, to me was a huge waste of money. True there are common sense things like if you change one bad injector you need to change them all. This is preventative not in that you changed the "good" injectors before they went bad, it's done because having one new injector and however many old ones will cause the "fresh" cylinder to carry more than it's share of the load potentially causing more problems in the future. Still in all but the most extreem cases I just can't see arbitrarily changing out a working part that you can measure or otherwise check/test just to have a new one. You can say what you want but the chances of either going bad aren't much better than 50-50 either way. For instance I recently changed out a turbo that was dragging on a small CAT engine. I installed a brand new turbo from CAT and it started slobbering oil within three miuntes of starting the engine, and in answer to your question, yes I did prelube it. I've changed a full set of Detroit injectors for the reason stated above and had two new ones lock up within a week. If I'd simply changed the one then there wouldn't have been any more injector problems but the new ones were bad too.In a case like this though it's danged if you do and danged if you don't. I admit there are times when doing a job for a customer when I know it'll be more in labor for me to check or test each individual piece than the cost of new and in those cases yes they get new parts because it's cheaper for them in the long run. I'm not worried about running "used" parts, if their good by the Mfg's specs, but nlike some outfits, I'm not out to line my own pockets with new parts markup, excessive labor, etc, I'm in it for the customer. Do them right and they'll always come back. In this case BSer was asking about a Detroit. Both the fuel and water pumps on a Detroit have weep holes that let you know if the shaft seals are leaking. If their not leaking and the fuel pressure is fine and the engine is cooling, why spend several hundred dollars to "freshen them up" especially when he already states that money is an issue. As for the internals Detroit gives a detailed exam procedure for all the internal parts with max or minimum wear limits. If your dong all the work yourself and the engine has say 5000 hours on it and the parts are still at 90% to 100% then why change them. I've seen "good" cranks break but I've never changed one just to make sure it doesn't. Basically preventative maintenance is good but there is a limit between preventative maintenance and wasteful spending. Where that limit is drawn has to be based on alot of factors. Knowing them all about each individual situation is half the game, and the rest is gonna be based on the past experience of the only person that can really make the call and that is the man working on the machine at the time.

Replies:

• Re: Wasting parts jdemaris 20:18:45 02/25/06 (0)

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