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Kubota B7100 Engine Knocking noise

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nolemann
Join Date: Oct 2007
Posts: 6 Tallahassee, florida
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2007-10-17          147053


Kubota B7100 HST, 660 hours on motor 90 somthing model, was discing when i heard a pop noise then engine starting knocking real bad, drove back to shed and parked, any ideas what this could be, serious?? how much and difficult to rebuild engine if that is whats needed, thanks

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Kubota B7100 Engine Knocking noise

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kthompson
Join Date: Oct 2005
Posts: 5256 South Carolina
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2007-10-17          147064


Sorry. Are you sure the noise is in the engine? ....

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Kubota B7100 Engine Knocking noise

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nolemann
Join Date: Oct 2007
Posts: 6 Tallahassee, florida
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-10-17          147065


thats what it sounds like to me, son in law is going to look at it today, will confirm when i hear from him, thanks ....

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Kubota B7100 Engine Knocking noise

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Murf
Join Date: Dec 1999
Posts: 7214 Toronto Area, Ontario, Canada
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2007-10-17          147068


The cause could be fuel contamination.

Proper ignition in a diesel engine requires several factors, compression, heat (caused by the compression) and a suitable amount of fuel delivered at the right time. If one or more of those factors changes, or is absent altogether, either poor or no ignition at all will result.

Anyone who has experienced the difference a bottle of good quality additive (Power Service, etc.) has made to the sound level and performance of a diesel knows what I'm talking about.

If something happens, such as some contaminants going through the fuel system, changes the cetane rating of the fuel it's very likely to retard the ignition enough to cause a serious amount of noise more than normal.

Best of luck. ....

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____________________________________________________________________________________
Kubota B7100 Engine Knocking noise

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nolemann
Join Date: Oct 2007
Posts: 6 Tallahassee, florida
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-10-17          147070


if that is the case will the problem go away on its own after it clears out?, i did put in new deisel fuel yesterday and ran on it for about 2 hours off and on, should i add some of the power service your talking about and see what happens? is it ok to run with the knocking noise? thanks ....

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Kubota B7100 Engine Knocking noise

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Murf
Join Date: Dec 1999
Posts: 7214 Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2007-10-17          147072


As the old saying goes .... "If" is the biggest little word in the English language.

"If" that is the problem, yes it will go away. I run the recommended dosage of Power Service (the white bottle) in all my diesels all the time, it makes a noticeable difference.

If it is contaminated fuel, and it has gotten as far as the injectors, you will have to clean the whole system out. Water in particular will not just get flushed out from running the engine.

You didn't say if the knock went away or it was there for the 2 hours you ran it?

Best of luck. ....

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Kubota B7100 Engine Knocking noise

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nolemann
Join Date: Oct 2007
Posts: 6 Tallahassee, florida
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2007-10-18          147100


Well dont know what happened, maybe it was contamination, son-in-law went down and cranked it and heard the noise, shut it down and cleaned all the debris from around the engine and radiator and noise went away, what should i do next, change the oil?? or just run it a while and see what happens, oil probably has maybe 10 hours on it, thanks for your help! ....

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Kubota B7100 Engine Knocking noise

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earthwrks
Join Date: Dec 2003
Posts: 3853 Home Office in Flat Rock, Michigan
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2007-10-18          147112


I'd play the lottery, myself :) ....

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Kubota B7100 Engine Knocking noise

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Art White
Join Date: Jan 2000
Posts: 6898 Waterville New York
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2007-10-20          147160




What kind of debris was removed, I know there isn't enough room for a drum set? ....

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Kubota B7100 Engine Knocking noise

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nolemann
Join Date: Oct 2007
Posts: 6 Tallahassee, florida
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-10-22          147217


not sure, i went down yesterday and looked, sticks, leaves, etc would be my guess, i cleaned off the front of the radiator and grill and put in some of the deisel clean from power source and ran it for 2 hours off and on and no noise, did check the oil and was ok, looked dirty so probably will change it next weekend, keeping my fingers crossed that it wont come back, thanks ....

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Kubota B7100 Engine Knocking noise

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randywatson
Join Date: Apr 2007
Posts: 109 texas
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2007-10-22          147221


I'm thinking possibly a stick getting whacked by the fan? quit when debris removed? ....

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____________________________________________________________________________________
Kubota B7100 Engine Knocking noise

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nolemann
Join Date: Oct 2007
Posts: 6 Tallahassee, florida
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-10-22          147222


no it was definately an internal engine noise, im not a mechanic but sounded to me like it blew the engine, which is why i imediately parked the tractor. just hope i never hear it again, thanks ....

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