Injection Limiter adjustment
On Mar 24, 12:19 pm, "Edgar" wrote:
When the cylinder walls are cold acidic combustion products stay on the cylinder wall instead of leaving as vapours with the exhaust gases and this leads to increased wear. This I did not know. Idling for 5 minutes is not as good for warming up the engine as getting some load on within, say, 2 minutes. The manual is pretty specific. I wonder if there is a trade off that depends somewhat on the engine involved. The bit about 'racing' the engine after prolonged idling is to get some fuel through the injectors as the flow at idling is so small that the fuel in the injector can start to polymerise and clog the holes in the nozzle. "This is done to clean out carbon from the cylinder and the fuel injection valve." Is what they say and I think that means what you said. :) Thanks, -- Tom. |
Injection Limiter adjustment
"Roger Long" wrote in
: I agree thought that excessive idling isn't good. "Reducing to 10 minutes" sounds like too much to me. Drive by any truck stop at 2AM in the cold. They idle 24/7 and only run 2 million miles between overhauls. What nonsense. |
Injection Limiter adjustment
Larry wrote:
"Roger Long" wrote in : I agree thought that excessive idling isn't good. "Reducing to 10 minutes" sounds like too much to me. Drive by any truck stop at 2AM in the cold. They idle 24/7 and only run 2 million miles between overhauls. What nonsense. Idling a diesel engine such as in a boat means it will never warm up to proper operating temperatures thus causing more wear. In the case of a semi in a truck stop, there is an automatic shutter in front of the radiator which closes down to keep the idling engine at operating temps. They don't shut them down because in the morning they would again be abusing a cold engine. G |
Injection Limiter adjustment
Gordon wrote in
: Larry wrote: "Roger Long" wrote in : I agree thought that excessive idling isn't good. "Reducing to 10 minutes" sounds like too much to me. Drive by any truck stop at 2AM in the cold. They idle 24/7 and only run 2 million miles between overhauls. What nonsense. Idling a diesel engine such as in a boat means it will never warm up to proper operating temperatures thus causing more wear. In the case of a semi in a truck stop, there is an automatic shutter in front of the radiator which closes down to keep the idling engine at operating temps. They don't shut them down because in the morning they would again be abusing a cold engine. G There were two 8V92TA train engines in my buddy Dan's 1981 Hatteras 56. Until I came along, he never operated these monsters at any speed over half of hull speed because he was terrified of it. We're talking about YEARS of "just idling around". The first time I opened the throttles wide as we cleared the Charleston Jetties, enough carbon black poured out of the pipes to make a mountain of tires, spread out over miles of ocean as a black cloud! She smoothed right out after clearing her throat. He went below, convinced the engines would explode in a blast of parts as she cleared 2/3 of redline. They didn't....they were fine....albeit a tiny bit noisy because Dan had the engine room hatches open with his fingers in his ears....(c; Soon after he spotted the fuel flow meters and did a little math, I pulled the throttles back to a more economical position, just above planing speed. What a beautiful yacht she was cruising along, a giant bassboat. When he sold her, right after Larry got everything working below the galley house and engine rooms and electronics suite, the buyer had General Diesel, our DD shop, to pull them down and inspect them. I knew he was wasting his money because they cranked so easily I'd be afraid to jack them over with a big wrench for fear they would spontaneously start they started so easily...GD found ONE out-of-spec spring in the starboard engine, in spite of Dan's "trawler speeds" all those years. They were just fine. I saw her a couple of years later and talked to the new owner who'd had her in the Caribbean long enough to completely blister her underwater hull. He cracked an injector, but that was all. She was still just fine, thousands of hours later. You yachties need a little reality check. Ask a local shrimper if you can go out with him for a day and watch his diesel(s) run. Count all the idling along hours during the day and multiply by the shrimp season... Notice how his engines are all pampered and pure like yours. I always thought what killed them first was the water in the injection system caused by the lazy ******* that owned them NOT filling the tanks before he stored them and NOT getting the oil changed because "I didn't run it much". If you crank it full of new oil, a biologic clock starts ticking as the fuel blowby consumes the lube oil...even if you "don't run it much". That's what kills sailboat engines.....disuse. |
Injection Limiter adjustment
Larry wrote:
Gordon wrote in : Larry wrote: "Roger Long" wrote in : I agree thought that excessive idling isn't good. "Reducing to 10 minutes" sounds like too much to me. Drive by any truck stop at 2AM in the cold. They idle 24/7 and only run 2 million miles between overhauls. What nonsense. Idling a diesel engine such as in a boat means it will never warm up to proper operating temperatures thus causing more wear. In the case of a semi in a truck stop, there is an automatic shutter in front of the radiator which closes down to keep the idling engine at operating temps. They don't shut them down because in the morning they would again be abusing a cold engine. G There were two 8V92TA train engines in my buddy Dan's 1981 Hatteras 56. Until I came along, he never operated these monsters at any speed over half of hull speed because he was terrified of it. We're talking about YEARS of "just idling around". Sorry Larry but half of hull speed is NOT idling! Gordon |
Injection Limiter adjustment
Gordon wrote:
Larry wrote: "Roger Long" wrote in : I agree thought that excessive idling isn't good. "Reducing to 10 minutes" sounds like too much to me. Drive by any truck stop at 2AM in the cold. They idle 24/7 and only run 2 million miles between overhauls. What nonsense. Idling a diesel engine such as in a boat means it will never warm up to proper operating temperatures thus causing more wear. Funny, my diesel has a thermostat, runs at the same temp in idle as it does at full throttle. Cheers Marty |
Injection Limiter adjustment
Roger Long wrote:
"Marty" wrote Funny, my diesel has a thermostat, runs at the same temp in idle as it does at full throttle. That's temperature measured in one spot and will be the same at idle as full throttle if the cooling system is performing properly. When starting from cold however, there are variations of temperature all over the engine that are not measured or directly controlled by a thermostat. Incidentally, idling an engine that has been run at normal power so that everything is fully warmed up is probably not nearly as bad for it as starting it and then running at idle for a couple hours to charge batteries. Everything is warm and, although it may cool down a bit in some parts, it won't go through a long period with some parts cold, minimial oil flow, and To be fair, we're probably talking apples and oranges here. My diesel is a little Volvo D1-13, http://www.volvo.com/NR/exeres/FD791...C27D991387.htm It probably quite quickly comes to the same temperature through out. When I installed it I went over it with a infrared thermometer and found very little variation in temp from the bottom of the block to top of the head, may about 5deg C after 10 minutes of idling. Cheers Marty |
Injection Limiter adjustment
On Mar 22, 3:06 am, "Roger Long" wrote:
Say, I just discovered that there is a plate that allows access to the injector limit spring and mechanism on my engine without having to pull the whole rear cover off. Take a look at your engine, I'll bet it has something similar. Ok, I just pulled the cover off. In as much as I can see anything it all looks fine. The hole is a lot smaller than it looks on the drawings... The little spring loaded rod that comes out of the limiter follows the throttle crank through its entire motion and appears to operate smoothly. I can't really see all the springs towards the tranny end of the motor but they are there. The whole assy is nicely oiled and looks lovely. I did tear the gasket while removing the plate. Any thoughts on whether I need to order the Yanmar part or if I can get away with some other method (eg. goo or paper)? I pondered the injection limiter and I can't see any way to fiddle w/ it w/o breaking the seal. Unlike the drawings the seal is through the cap nut rather than the lock nut... Hmmmm.... -- Tom. |
Injection Limiter adjustment
On Mar 25, 9:01 am, " wrote:
I did tear the gasket while removing the plate. Any thoughts on whether I need to order the Yanmar part or if I can get away with some other method (eg. goo or paper)? The local dealer has them in stock for $1.50... So, I'll get a new Yanmar (tm) one. -- Tom. |
Injection Limiter adjustment
On Mar 25, 9:36 am, " wrote:
On Mar 25, 9:01 am, " wrote: I did tear the gasket while removing the plate. Any thoughts on whether I need to order the Yanmar part or if I can get away with some other method (eg. goo or paper)? The local dealer has them in stock for $1.50... So, I'll get a new Yanmar (tm) one. -- Tom. Just installed the new gasket. I have had the plate on and off 3 times now; I'm so glad I don't pay myself by the hour... There was a bit of paint and gunk on the throttle crank itself (the dealers repainted the engine when they had it). So, I oiled the crank axle and worked it back and forth a bit. It runs quite smoothly now. After the first re-assembly the motor showed its old hunting symptoms to a greater extent than I've ever seen before. However, with the new gasket in it runs perfectly... Sadly I didn't keep all the other variables constant. The solar panels have been charging the batteries and the hour break to run down to the Yanmar dealer probably didn't let the motor cool off entirely. I'll try it again in the morning. -- Tom. |
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