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09 /14/ 25, 6:50am

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Subject: 12.5 KW Kohler Won't Start Author: Dave Mills [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 07/ 4/ 02, 5:27am I have a 87 PT36 with the 12.5 Kohler (Yanmar engine). It seems to run just perfect - if I can get it started. Sometimes it starts, but will get running only if I keep the start button engaged (all of the start buttons exhibit the same symptoms). Other times, there is either a click or a series of clicks coming from the flat box in front of the battery that contains all of the switches. Opening the box, I bypass the start switch and symptoms remain the same. There is a Bosch part (capacitor?) that vibrates with each click. This all started after running the generator for several hours. Does anyone have clue? Is this a simple fix? Battery was low and I replaced it. [ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

[> Subject: Re: 12.5 KW Kohler Won't Start Author: Bob Dilks [ Edit | View ] Date Posted: 07/ 7/ 02, 7:58am Factory recommends that every start should be preceeded with a 30 second use of the glowplugs by holding the generator start/stop switch in the stop position for 30 seconds before moving to the start position. You did not mention if the engine is turning over but refuses to start. If the engine does turn over (and I assume it does) and the glowplug use is to no avail, then the likely culprit is the fuel shut off relay. Test with the generator extended from the coach. If the relay is at fault, you will notice the throtle arm move when the start switch is pushed on but the throtle arm will immediately return to the shut off position cutting off fuel to the engine before it can start. This relay can be sporadic allowing the sometime start, sometime not start routine. [ Post a Reply to This Message ]

[> [> Subject: Re: 12.5 KW Kohler Won't Start Author: Dave Mills [ Edit | View ] Date Posted: 07/ 7/ 02, 1:43pm Generator does not usually crank. All I get is the clicking. If it happens to crank, it starts right up. It stays running until I turn loose of the starter switch, then it stops. I will check for weak ground and other connections. [ Post a Reply to This Message ]

[> [> [> Subject: Re: 12.5 KW Kohler Won't Start Author: Dave Mills [ Edit | View ] Date Posted: 07/ 20/ 02, 7:59am Final status. Two or three problems. I fixed weak battery connections. Then the generator would ALWAYS start and stay running only if I held the start button on. It was generating 88 volts. Second problem was a transformer fuse. When the fuse was replaced and the brushes cleaned, the voltage returned to 242 and it started and ran fine. [ Post a Reply to This Message ]

[> [> [> [> Subject: Re: 12.5 KW Kohler Won't Start Author: Neil LeKIander [ Edit | View ] Date Posted: 01/ 3/ 03, 5:23pm Hi Dave, I have read your posts and those of Robert Rahn on the subject of Kolher generators which will start the engine but not continue running (or generating AC current) if the switch is released. Mine is doing exactily the same thing. It is in an 85 PT36 and has only 858 hrs. It is seldom used but like all such systems it is essential when it is required. You spoke of a transformer fuse and cleaning the brushs; please explain further. I have looked at the factory service manual and find no mention of a transformer or a controling fuse nor any guidance for the brush cleaning procedure. For your info, I did determine that the control box contains three small relays and one large one. These relays all control the start sequence, generator exciting and then when the generator spins up and begins to develop AC power the large multi-function relay is latched(via AC) allowing the engine to continue to run while preventing the starter from operating, etc. I replaced all of these relays as they are relatively cheap and easy to access; this provided some benifits; the problem in now only intermittant, not continual. Please provide what ever follow-up you can and perhaps others will also comment. Thanks, Neil [ Post a Reply to This Message ]