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+--- Thread: Vibration. Clutch or engine? (/showthread.php?tid=8582)
RE: Vibration. Clutch or engine? - Petegraintrain - 11-25-2022
(11-25-2022 )Petegraintrain Wrote:And this was a new crate engine from cummins (not recon) so I would think it wouldn't have a bent rod from factory but anything possible i guess(11-25-2022 )Rawze Wrote: had someone here one time with a vibration no one could find .. was in the enigne, it would be real bad at about 1400 rpm or so even in neutral.this thing also has a vibration at 1400 even in neutral. But if I shut my engine off. Then restart it and rev it up to 1400. It takes about half a minute for the vibration to come back. And that vibration is worse some days than others.. I would think a bent connecting rod would vibrate the whole time it wouldn't take a bit for it to show up
turns out that it had a slightly bent (not visible by eye) connecting rod because they re-used the old rods during its recent inframe after the engine had hydra-locked previously and no one bothered to check them properly.
the quality of what repair shops do to these engines is complete s$it these days.. so one never knows any more.
RE: Vibration. Clutch or engine? - windowrattler - 11-25-2022
Does the vibration go away with the clutch disengaged would be the question. In just neutral the input shaft would still be spinning.
RE: Vibration. Clutch or engine? - Petegraintrain - 11-25-2022
(11-25-2022 )windowrattler Wrote: Does the vibration go away with the clutch disengaged would be the question. In just neutral the input shaft would still be spinning.Clutch in or out makes no difference
RE: Vibration. Clutch or engine? - tree98 - 11-25-2022
(11-25-2022 )Petegraintrain Wrote:(11-25-2022 )windowrattler Wrote: Does the vibration go away with the clutch disengaged would be the question. In just neutral the input shaft would still be spinning.Clutch in or out makes no difference
It's not the clutch then.
RE: Vibration. Clutch or engine? - Petegraintrain - 11-25-2022
(11-25-2022 )tree98 Wrote:Honestly I feel like I'm dealing with 2 vibrations. The one at 1400 rpm when I'm parked I can't feel in the clutch pedal. But the one when driving I feel in the clutch pedal through out all the rpms(11-25-2022 )Petegraintrain Wrote:(11-25-2022 )windowrattler Wrote: Does the vibration go away with the clutch disengaged would be the question. In just neutral the input shaft would still be spinning.Clutch in or out makes no difference
It's not the clutch then.
RE: Vibration. Clutch or engine? - Nilao - 11-25-2022
I have a vibration from 1300-1400 on my 871 whether moving or not, clutch in or out. I'm 99% sure I have a leaking injector causing a miss. I also have a fuel line that will seep a bit of fuel at the connector so I could also be sucking minute amounts of air there as well.
RE: Vibration. Clutch or engine? - marek4792 - 11-25-2022
I was gonna suggest this, lot of times the fuel system and IFSM gets overlooked whether it is an timing/metering actuator, pulsation dampers, check valves, etc..
RE: Vibration. Clutch or engine? - tree98 - 11-25-2022
Will it pass a leakdown test?
RE: Vibration. Clutch or engine? - Petegraintrain - 11-26-2022
(11-25-2022 )tree98 Wrote: Will it pass a leakdown test?How is a leakdown test performed? That's something I have not done yet.