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Motor sounds like marbles and "diesels" after stopping
I just had my 20 hour service on my new motor. I'm no mechanic, so I had it
done by the Sea Ray dealer. I mentioned to them that it had a difficult first start once. Also it has been continuing to run ("dieseling") after turning off the ignition. They said everything checked out, but they went ahead and "advanced the timing a little." I should have kept my mouth shut, but ... Could be my imagination, the boat seems to run well, but it sure doesn't seem to sound like it did before the 20 hour service. Instead of a nice tight sounding motor it sounds like it's full of marbles. And I still had a couple of episodes of "dieseling." Why the "dieseling" before and after the service? Does advancing the timing "a little" alter the sound of a motor? Sea Ray 185 6 Cylinder carbureted 4.3L Alpha1 Mercruiser |
Dieseling on shutdown indicates:
1.idle speed too high 2.engine temp too high 3.spark plug heat range too high 4.carbon hot spots in combustion chamber 5. very poor fuel quality timing doesn't count. JR Bryan wrote: I just had my 20 hour service on my new motor. I'm no mechanic, so I had it done by the Sea Ray dealer. I mentioned to them that it had a difficult first start once. Also it has been continuing to run ("dieseling") after turning off the ignition. They said everything checked out, but they went ahead and "advanced the timing a little." I should have kept my mouth shut, but ... Could be my imagination, the boat seems to run well, but it sure doesn't seem to sound like it did before the 20 hour service. Instead of a nice tight sounding motor it sounds like it's full of marbles. And I still had a couple of episodes of "dieseling." Why the "dieseling" before and after the service? Does advancing the timing "a little" alter the sound of a motor? Sea Ray 185 6 Cylinder carbureted 4.3L Alpha1 Mercruiser -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
I thought timing was everything! Well, that's what my wife tells me.
# 2, the engine operators booklet says to idle for a bit before shutting down after running hard. I noticed that the dieseling didn't occur if I did just that. My fuel quality should be okay. I'll have to take notice of the idle speed next time I'm out, but if it's high I didn't notice. Spark plugs are "fresh" from the factory. Thanks "JR North" wrote in message ... Dieseling on shutdown indicates: 1.idle speed too high 2.engine temp too high 3.spark plug heat range too high 4.carbon hot spots in combustion chamber 5. very poor fuel quality timing doesn't count. JR Bryan wrote: I just had my 20 hour service on my new motor. I'm no mechanic, so I had it done by the Sea Ray dealer. I mentioned to them that it had a difficult first start once. Also it has been continuing to run ("dieseling") after turning off the ignition. They said everything checked out, but they went ahead and "advanced the timing a little." I should have kept my mouth shut, but ... Could be my imagination, the boat seems to run well, but it sure doesn't seem to sound like it did before the 20 hour service. Instead of a nice tight sounding motor it sounds like it's full of marbles. And I still had a couple of episodes of "dieseling." Why the "dieseling" before and after the service? Does advancing the timing "a little" alter the sound of a motor? Sea Ray 185 6 Cylinder carbureted 4.3L Alpha1 Mercruiser -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
Dieseling on shutdown indicates:
1.idle speed too high 2.engine temp too high 3.spark plug heat range too high 4.carbon hot spots in combustion chamber 5. very poor fuel quality timing doesn't count. JR or a vacuum leak timing actually could count, by being a bit advanced, but that would agrevate the real culprit in poor fuel quality. |
I agree, timing is everything. If timing to too far advanced engine will
ping(detonate). Detonation will crack pistons, burn holes in pistons, etc! Get the idea. "Bryan" wrote in message m... I thought timing was everything! Well, that's what my wife tells me. # 2, the engine operators booklet says to idle for a bit before shutting down after running hard. I noticed that the dieseling didn't occur if I did just that. My fuel quality should be okay. I'll have to take notice of the idle speed next time I'm out, but if it's high I didn't notice. Spark plugs are "fresh" from the factory. Thanks "JR North" wrote in message ... Dieseling on shutdown indicates: 1.idle speed too high 2.engine temp too high 3.spark plug heat range too high 4.carbon hot spots in combustion chamber 5. very poor fuel quality timing doesn't count. JR Bryan wrote: I just had my 20 hour service on my new motor. I'm no mechanic, so I had it done by the Sea Ray dealer. I mentioned to them that it had a difficult first start once. Also it has been continuing to run ("dieseling") after turning off the ignition. They said everything checked out, but they went ahead and "advanced the timing a little." I should have kept my mouth shut, but ... Could be my imagination, the boat seems to run well, but it sure doesn't seem to sound like it did before the 20 hour service. Instead of a nice tight sounding motor it sounds like it's full of marbles. And I still had a couple of episodes of "dieseling." Why the "dieseling" before and after the service? Does advancing the timing "a little" alter the sound of a motor? Sea Ray 185 6 Cylinder carbureted 4.3L Alpha1 Mercruiser -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
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"Woodchuck" wrote in message ... I agree, timing is everything. If timing to too far advanced engine will ping(detonate). Detonation will crack pistons, burn holes in pistons, etc! Get the idea. Yes. Thanks. "Bryan" wrote in message m... I thought timing was everything! Well, that's what my wife tells me. # 2, the engine operators booklet says to idle for a bit before shutting down after running hard. I noticed that the dieseling didn't occur if I did just that. My fuel quality should be okay. I'll have to take notice of the idle speed next time I'm out, but if it's high I didn't notice. Spark plugs are "fresh" from the factory. Thanks "JR North" wrote in message ... Dieseling on shutdown indicates: 1.idle speed too high 2.engine temp too high 3.spark plug heat range too high 4.carbon hot spots in combustion chamber 5. very poor fuel quality timing doesn't count. JR Bryan wrote: I just had my 20 hour service on my new motor. I'm no mechanic, so I had it done by the Sea Ray dealer. I mentioned to them that it had a difficult first start once. Also it has been continuing to run ("dieseling") after turning off the ignition. They said everything checked out, but they went ahead and "advanced the timing a little." I should have kept my mouth shut, but ... Could be my imagination, the boat seems to run well, but it sure doesn't seem to sound like it did before the 20 hour service. Instead of a nice tight sounding motor it sounds like it's full of marbles. And I still had a couple of episodes of "dieseling." Why the "dieseling" before and after the service? Does advancing the timing "a little" alter the sound of a motor? Sea Ray 185 6 Cylinder carbureted 4.3L Alpha1 Mercruiser -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
They're closed, but I'll take it back and have them correct the timing.
Thanks. "Gudmundur" wrote in message ... In article , says... Go now and get them to back off the timing a bit. Your Marble sound is detonation and that will kill your engine quicker than throwing sand down it's throat. I guess most boat carbs don't have 'anti-dieseling' solenoids like cars do. That solenoid is what causes your normal idle and then when you cut off the power, the solenoid drops down and completely closes the butterfly valves so no gas can enter the cylinders. Presto--No diesel! |
When you turn the ignition off, the spark stops. Therefore, timing
doesn't count for that reason JR Tim wrote: Dieseling on shutdown indicates: 1.idle speed too high 2.engine temp too high 3.spark plug heat range too high 4.carbon hot spots in combustion chamber 5. very poor fuel quality timing doesn't count. JR or a vacuum leak timing actually could count, by being a bit advanced, but that would agrevate the real culprit in poor fuel quality. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
But doesn't over advanced timing create hot spots within the cylinder
chamber? "JR North" wrote in message ... When you turn the ignition off, the spark stops. Therefore, timing doesn't count for that reason JR Tim wrote: Dieseling on shutdown indicates: 1.idle speed too high 2.engine temp too high 3.spark plug heat range too high 4.carbon hot spots in combustion chamber 5. very poor fuel quality timing doesn't count. JR or a vacuum leak timing actually could count, by being a bit advanced, but that would agrevate the real culprit in poor fuel quality. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
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