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Old 05-16-2011, 12:00 PM   #15
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That is correct. About 4 years ago they changed to a Kubota motor. You can tell by the motor designator. If it is a HDCxx designator it is a Isuzu and if it is a HDKxx it is a Kuboto. I did look up the valve adjustment requirement and it is 800 hours on a Kuboto and 1000 hrs on a Isuzu.
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Old 05-16-2011, 05:25 PM   #16
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Ok thanks to all for the info about the Gen set I went out today and got the parts, thermostat belt and a small hose, now just need to find the time to remove the Gen set out of motor home in order to get it all done including the valve adjustment
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Old 05-16-2011, 11:23 PM   #17
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800 hours: Valve clearance - OrangeTractorTalks - Everything Kubota
http://www.cumminsonan.com/www/pdf/rv/f-1123.pdf
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Old 08-09-2011, 06:07 PM   #18
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Mike and others:
I am getting ready to do the 1,000 hours maintenance on the HDKAK Onan (2007) and noted there is no mention of valve adjustment either. I also found that I cannot locate the Kubota engine manual which shows the lash setting and other engine related information. Do any of you have such a manual and if so, where did you find it? I am interested only in confirming the valve lash specs for my engine since I believe I can set it myself.
Thanks for your help
Jim
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Old 08-14-2011, 08:20 PM   #19
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I was told by a generator specialist that these units dont need a valve adjustment this early in its life he also told me that he had one apart with 4000 hours and the owner never did anything done to it and the valve clerance was fine they dont move much he said he told me change the fan and the thermostat and a small S shape hose at the water pump, I spent about 30 or 40 dollars and did the work my self, he did tell me to keep changing the oil on it and check colant level and they go on for ever. Joe
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Old 08-14-2011, 08:44 PM   #20
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Ninos:
Thanks for your reply. Pulling the generator out of the RV was the most difficult task in performing the 1,000 hour maintenance. After spending the time and effort to remove the unit, it was relatively easy to change the hoses, belt, thermostat and antifreeze. After pulling the generator covers, I found the Kubota engine codes and valve lash settings on the valve cover. Since easy to check the lash at that time, I ended up adjusting 5 of the 6 (1 was in spec). I will admit that none of them were far off but I do believe it best to check while out of the RV and at the first 1,000 hours due to the initial wear of the new engine particularly since easily accessible. Finding TDC was the most difficult since you cannot see the timing mark which is covered by the air box. I pulled a glow plug (which didn't want to come out) and used a wire in determining TDC on the compression stroke. Pulling the glow plug was the scariest part since it didn't want to come out and I was told that they can fall apart if not careful. All is done now and working fine. Thanks again for your reply.
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Old 08-14-2011, 09:25 PM   #21
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I disagree with that tech that says you do not have to check valve lash adjustment at 850 to 1000 hours. Kubota requires it at 850 hrs and Isuzu at 1000 hrs. On my Isuzu they should be at .008" cold and all mine were even at .012". Agreed this is not bad having them open up and a lot better than having them close up. This is the initial valve adjustment after the break in and should be done. Maybe they will be right on maybe not and therefore the reason to do it. Those parts have worn in and seated and should be good after this adjustment. I bet they are not as far off at 1700 -2000 hr check. If a valve lash is too loose it can beat the heck out of the end of the valve and require the head to be pulled or it can cost you power and therefore diesel fuel consumption.
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