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post #1 of 13 Old 04-20-2019, 03:49 PM Thread Starter
2005 JD LT190
 
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FH580V Crankcase

Disassembling the engine of my 2004 LT190 looking for the cause of excessive vibration. The power plant is a Kawasaki FH580V with 300+ hours. Discovered a wear spot on the main bearing at the flywheel end (see attached photo). The wear appears to have cut into the crankcase. No visible wear on the crankshaft. Am wondering if it's time for a new crankcase.
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post #2 of 13 Old 04-20-2019, 04:38 PM
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Re: FH580V Crankcase

End play on the crankshaft, did it have any shims?

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post #3 of 13 Old 04-20-2019, 05:10 PM
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Re: FH580V Crankcase

Looks like that was machined in from here. There is a block on eBay that looks the same. Perhaps it's intentional?
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post #4 of 13 Old 04-20-2019, 06:03 PM Thread Starter
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Re: FH580V Crankcase

No shims found during crankshaft removal.
What is the procedure for measuring end play on the crank shaft? (Tech manual is not clear on this.)
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post #5 of 13 Old 04-20-2019, 06:05 PM Thread Starter
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Re: FH580V Crankcase

Could you send a link to the photo on ebay? Many Thanks!
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post #6 of 13 Old 04-20-2019, 07:04 PM
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Re: FH580V Crankcase

It's left over from boring or honing the cyl on that side. No way does any problem with the crankshaft cause that sort of mark on the crankcase plus all the crankshaft thrust is on the lower bearing surface.

What sort of vibration issue are you having ?
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post #7 of 13 Old 04-21-2019, 09:13 AM Thread Starter
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Am on my third PTO in as many years. Vibration occurs at all engine speeds, with or without PTO installed. Am thinking bent crankshaft (CS) but do not have the means to measure eccentricity. Per caliper measurement the CS appears to be within normal wear limits. Still need to measure wear in main bearing bore at PTO and flywheel ends.
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post #8 of 13 Old 04-21-2019, 10:23 AM
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Re: FH580V Crankcase

Some of the earlier and smaller Kaw twins did have problems with wearing out the upper bearing. Beginning with your motor Kaw rerouted the oil flow to fix the problem. On the older motors the upper main brg was oiled through the crankshaft drillings that also oilod the rod bearings. With the new layout the oil exits the filter and goes to the upper and lower main brgs first. You can see the cast in oil galley in the block. You might still have worn bearings.

A 90 degree V Twin has perfect primary balance. They do have a secondary imbalance due to the rods and pistons being not in the same plane. This would be noticed as a rocking couple and would occur at all engine speeds bit the effect is not great due to the low rpm . I have one of these later Kaw twins on a mower and you can feel the vibration at idle but at higher rpms the motor is very smooth.

You could bolt the cases back together with only the crank installed and use a dial indicator to see how much play the crank stubs have. I doubt the crank is bent.
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post #9 of 13 Old 04-21-2019, 10:24 AM
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Re: FH580V Crankcase

I also kind of remember that if the upper brg was worn there would be oil leaking from the upper seal.
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post #10 of 13 Old 04-21-2019, 02:10 PM Thread Starter
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Thanks rayjay. If it turns out that a main bearing is the issue, are they replaceable or will I need to get a new cylinder block / crankcase cover?
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post #11 of 13 Old 04-21-2019, 08:18 PM
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Re: FH580V Crankcase

I don't think they are offered as repair parts. You can buy the brgs for the water cooled twins but iirc they are not listed for the air cooled twins. If we could find out who actually made the bearing then we might could buy them direct. I have a couple of these motors that I would like to rebuild. Not really cost effective though. Just find a cheapish LT180 or LT190 with a dead K46 and voila, good motor for little money.
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post #12 of 13 Old 04-21-2019, 08:54 PM
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Re: FH580V Crankcase

Does it actually have bearings? My FR651V just used the crankcase, and you had to buy a new crankcase.

Course, if my crankcase was worn, I would see if I could source a bearing with the correct I.D., and if found, get the case bored out to be able to press in the bearing (and cut out relevant oil passages in the bearing as necessary).
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post #13 of 13 Old 04-22-2019, 08:22 AM
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Re: FH580V Crankcase

Talk about non-serviceable !!! I just looked on the Kaw parts site and they don't even offer oversize pistons and rings for these motors !!
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