B7000 white smoke under load

tajfun211

New member

Equipment
Kubota B7000 with ori loader and rotary tiller
Aug 27, 2020
8
0
1
Poland
Hello to All ,
Recently, I have owned the Kubota B7000 tractor.
It smokes white profusely when loaded, also turns long to start and has engine blow-by.
Compression 1 cylinder 22 Bar; the second cylinder 25 Bar, while after the oil test 30 and 32 Bar respectively.
Suspicion is the rings and / or pistons and / or cylinder liners :(
I also checked the valve clearance, it was 0.15-0.25; I adjusted it to 0.2 for all.
I also did a filter-oil-strip service with engine rinsing (I have the impression that the belt is as old as the tractor, > 40 year)
So I'm looking for a service/parts books for the Z650 engine with a capacity of 653cc or any refernce for this one ;)

There is a lot in the network for other engines, but for this one almost nothing, looks that is quite rare.

Below are some photos and a link to the movie showing engine blow-by.

1.jpg 2.jpg 3.jpg 4.jpg 5.jpg 6.jpg 7.jpg 9.jpg 10.jpg 11.jpg
 

BigG

Well-known member

Equipment
l2501, FEL, BB, Rotary cutter, rake,spreader, roller, etc. New Holland TL80 A
Sep 14, 2018
1,950
774
113
West Central,FL
I am wondering if the injectors are starting to go bad. I have had the long starts and white smoke in a GMC diesel with bad injectors. The blow by I can not help you with.
 
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tajfun211

New member

Equipment
Kubota B7000 with ori loader and rotary tiller
Aug 27, 2020
8
0
1
Poland
White smoke smells closer to engine oil than petroleum for me, but I'll check injectors as well.

First of all I need to improve cylinder pressure because as far I know 22-25 Bar (320-360 psi) is to low for diesel engine but as mentioned earlier I have no data about compression pressure factory spec. for the Z650 engine.
 
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