Posted by steve terplak on September 02, 2013 at 05:06:32 from (198.45.135.74):
Hey guys, I took my Massey 1080 out to mow recently, it is a Perkins 318 4 cyl diesel, and it sounded like it was running on 3 cyl, it was a little under powered and seemed to be putting a little extra smoke out while running... so I figured injector issue...
I was told the best procedure for diagnosis was to crack the fuel line to each injector with the engine running and, whichever injector line being loosened did not make the engine worse...that was your problem. Then, once the culprit is identified, switch it with a different injector and make sure that it is the injector and not something in the cylinder.
So...did just that, cracked the fuel lines one at a time...and it was the injector closest to the front of the tractor that was the problem. Then switched that with the one next to it and that is where the issues got worse.
The problem stayed at the front cylinder and the "bad" injector worked in cylinder #2... further, now instead of just running rough and getting some extra smoke, the tractor began making a wheezing sound like air/fuel was escaping at the injector location in cylinder #1.
So. What to do now? When we switched the 2 injector, a copper ring came out with the 1st injector but not with the 2nd, it stayed in the hold. we moved the copper ring off of injector #1 and put it on #2 and put 1 in the hole with copper ring #2. Could we have contaminated the seating of the injector and that is why we are getting the blowby? Could the removal of the injector have knocked crud off of it and that is why the problem seems to not have moved with the injector? Do we have a problem in the cylinder? Where else could the problem lie? Are we missing something (fuel line perhaps)
We have decent mechanical skills but are not mechanics and, if the problem is greater than injectors we would be shipping it off to a "professional"...I am of the opinion that we are better off quitting while ahead at this point and letting someone else take a look, my dad thinks we should repeat our process from yesterday and try to get everything back to the condition we started with...
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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