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+--- Thread: Noise dissapears above 2000rpm (/showthread.php?tid=7969)
Noise dissapears above 2000rpm - addi.bigg - 02-07-2018
OM605 7,5mm Dieselmeken elements, mechanical pump. Timing is in place, adjusted to the stock value.
The symptom is that while running in low rpm (1200-1300rpm), pressing the throttle pedal to speed up, some strange noise comes, some knocking which sudennly dissapears at 2000rpm. It seems like something is a bit late while increase the rpm and it's gain on at 2000rpm. Nothing above it. It always dissapears in the same rpm.
Any ideas what that can be?
RE: Noise dissapears above 2000rpm - CutWeldDrive - 02-08-2018
as far as i know the 7,5mm Dieselmeken elements have a different timing value to stock.
someone maybe able to confirm or tell me i'm talking crap.
but nearly sure i saw this somewhere
RE: Noise dissapears above 2000rpm - Mr.Emo - 02-08-2018
Yeah, they usually send out instructions with the pump.
RE: Noise dissapears above 2000rpm - addi.bigg - 02-09-2018
(02-08-2018, 11:50 AM)CutWeldDrive as far as i know the 7,5mm Dieselmeken elements have a different timing value to stock.
someone maybe able to confirm or tell me i'm talking crap.
but nearly sure i saw this somewhere
The quantity is low 85-90ccm. I'm really not on the borderline from the upper side.
RE: Noise dissapears above 2000rpm - addi.bigg - 02-09-2018
If the oil pump chain is not tight enough what kind of noise it can make?
RE: Noise dissapears above 2000rpm - barrote - 02-09-2018
Mos probably the noise u mention is nailing due to excess advance in low rpm.
Once the threshold is passed it goes. Replace timming sprocket by a 605 N/A.
RE: Noise dissapears above 2000rpm - addi.bigg - 02-12-2018
(02-09-2018, 04:56 AM)barrote Mos probably the noise u mention is nailing due to excess advance in low rpm.
Once the threshold is passed it goes. Replace timming sprocket by a 605 N/A.
I've sent you a pm.
RE: Noise dissapears above 2000rpm - addi.bigg - 02-13-2018
https://www.youtube.com/watch?v=NuL12eCnDR8&feature=youtu.be
Any suggestions regarding this noise?
This is the one that dissapears. If the engine is cold it is louder.
RE: Noise dissapears above 2000rpm - addi.bigg - 02-13-2018
(02-13-2018, 12:42 PM)addi.bigg https://www.youtube.com/watch?v=NuL12eCnDR8&feature=youtu.be
Any suggestions regarding this noise?
In this you can hear when the noise dissapears.
https://youtu.be/GK_naRLhslk
RE: Noise dissapears above 2000rpm - NoFear - 08-07-2019
Same problem. What is the solution?
RE: Noise dissapears above 2000rpm - barrote - 08-08-2019
Those engines in the videos sound really bad... my sugestion on the advance mechanism is still valid.
Check out it is working properlly. Sometimes they do not, cause of a design flaw. Using a older 605 N/A solve the problem.
But its definetly timing related... its god damm advanced...
RE: Noise dissapears above 2000rpm - NoFear - 08-14-2019
Is this normal sound? https://youtu.be/jl55lNaYGz0
https://youtu.be/HTKOZvW_tik