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Kohler xt675-2047 NO MARK crankshaft
#3
M
mechanic mark
Locate your engine manual above & see pages 45 & 46 .
M
mechanic mark
Free Kohler Service Manual Downloads - OPEengines.com
Listed below are Kohler engine service repair manual in Adobe PDF format that you can download for free. Below we have provided a link to these manuals which can also be download. Click on your engine listed below to download. These service manuals provide general information, adjustment...
www.kohler-engine-parts.opeengines.com
#5
StarTech
StarTech
The problem is the soft metal Kohler use for the crank gear. IT is the same here where the shim has completely worn away the timing mark. IT appears to be set with the piston at TDC then align the cam gear timing mark with the crankshaft.
Here is an example of one where the timing mark is just visible.
Here is an example of one where the timing mark is just visible.
#9
C
cyryl
EDIT: 09.09.2023 18:00
I have already assembled this unfortunate lawnmower. I set the shaft at the very top, inserted the camshaft so that it would immediately open the intake valve, and watched the valves move relative to the shaft. I am practically certain that I set it up correctly, I screwed everything together, filled in new oil, and turned the shaft a little (with a screwdriver) on the first shot without the spark plug connected. Later, I connected the spark plug and started the lawnmower with a screwdriver without any problems. It ran for a while (about a minute), so I put the top together (plastics and pull-start). To my surprise, it doesn't want to start at all on the pull-start, but when I disassembled the top again and tried with a screwdriver, it worked without any problems. Could it be that I hit a tooth or two?
C
cyryl
How plz tell me
EDIT: 09.09.2023 18:00
I have already assembled this unfortunate lawnmower. I set the shaft at the very top, inserted the camshaft so that it would immediately open the intake valve, and watched the valves move relative to the shaft. I am practically certain that I set it up correctly, I screwed everything together, filled in new oil, and turned the shaft a little (with a screwdriver) on the first shot without the spark plug connected. Later, I connected the spark plug and started the lawnmower with a screwdriver without any problems. It ran for a while (about a minute), so I put the top together (plastics and pull-start). To my surprise, it doesn't want to start at all on the pull-start, but when I disassembled the top again and tried with a screwdriver, it worked without any problems. Could it be that I hit a tooth or two?
#10
V
VegetiveSteam
Check out this video to help understand what valve overlap is. It's of course not your engine but the principle is the same.
Then check and see if you get correct valve overlap when you turn your engine over by hand to top dead center exhaust. You will have valve overlap somewhere during the rotation of the crankshaft but you want it with the piston at TDC between the exhaust stroke and the intake stroke. At that point the engine is just finishing the exhaust stroke and the next stroke is the intake stroke. There is a brief moment between those strokes that both valves should be open just a little bit. If you have the rocker cover off and turn the crankshaft in the proper rotation until the piston is at TDC at the end of the exhaust stroke, then turn the crankshaft back and forth about an inch or two your rocker arms should teeter totter. If you find valve overlap and the piston is not at TDC the cam and crank are not in time.
V
VegetiveSteam
The only way I know to time a cam to a crank without marks it to do it until I get correct valve overlap.How plz tell me
EDIT: 09.09.2023 18:00
I have already assembled this unfortunate lawnmower. I set the shaft at the very top, inserted the camshaft so that it would immediately open the intake valve, and watched the valves move relative to the shaft. I am practically certain that I set it up correctly, I screwed everything together, filled in new oil, and turned the shaft a little (with a screwdriver) on the first shot without the spark plug connected. Later, I connected the spark plug and started the lawnmower with a screwdriver without any problems. It ran for a while (about a minute), so I put the top together (plastics and pull-start). To my surprise, it doesn't want to start at all on the pull-start, but when I disassembled the top again and tried with a screwdriver, it worked without any problems. Could it be that I hit a tooth or two?
Check out this video to help understand what valve overlap is. It's of course not your engine but the principle is the same.
Then check and see if you get correct valve overlap when you turn your engine over by hand to top dead center exhaust. You will have valve overlap somewhere during the rotation of the crankshaft but you want it with the piston at TDC between the exhaust stroke and the intake stroke. At that point the engine is just finishing the exhaust stroke and the next stroke is the intake stroke. There is a brief moment between those strokes that both valves should be open just a little bit. If you have the rocker cover off and turn the crankshaft in the proper rotation until the piston is at TDC at the end of the exhaust stroke, then turn the crankshaft back and forth about an inch or two your rocker arms should teeter totter. If you find valve overlap and the piston is not at TDC the cam and crank are not in time.
#14
C
cyryl
C
cyryl
The lawnmower was burning oil, smoking blue like crazy. The old piston rings had about 2-4 mm of gaps. I'm surprised it started at all! 
Very possible, thanks to your video, I learned that at the end of the exhaust stroke, two valves are slightly open, and I thought it was a mistake and tried to correct it by moving the camshaft :/. Today, I don't have the energy for it anymore, but tomorrow or on Monday, I'll try to fix it.
#17
V
VegetiveSteam
I have friend at the Central U.S. distributor and this was bugging me enough that I was going to call him and ask him to pull a crankshaft out of stock and send me a pic of the timing mark. Then I checked their inventory they don't have any XT crankshafts in stock and I couldn't find any history where they ever even sold one. That really didn't surprise me as if one of these engines is in bad enough shape to need a crankshaft it's probably not worth the time or money.
V
VegetiveSteam
I forgot to mention this to you yesterday but I looked at your crankshaft pictures blown up as much as I could and I couldn't find any evidence of a timing mark in any of them.Cant upload here:/
I have friend at the Central U.S. distributor and this was bugging me enough that I was going to call him and ask him to pull a crankshaft out of stock and send me a pic of the timing mark. Then I checked their inventory they don't have any XT crankshafts in stock and I couldn't find any history where they ever even sold one. That really didn't surprise me as if one of these engines is in bad enough shape to need a crankshaft it's probably not worth the time or money.
#18
StarTech
StarTech
#19
StarTech
StarTech
Okay guys Kohler tech support finally got back to me on the timing mark location.
It is the second tooth CCW from the 3 o'clock position.
Sorry for the late reply but you can blame it on Kohler, Italy.
It is the second tooth CCW from the 3 o'clock position.
Sorry for the late reply but you can blame it on Kohler, Italy.