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When does this switch come into play?
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NHC250 starter lock-out switch
- Thread starter cranetruck
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No.2Diesel
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I'm guessing that it prevents the engine being started if there is low or no oil in the crankcase.
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That line is comming from the main oil rifle. It might be a switch that won't let the starter engage if there is oil pressure, so when the engine is running, you can't accidentally hit the starter button and put the bendix into the ring gear. 
mangus580
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Re: RE: NHC250 starter lock-out switch
Agreed....WillWagner said:That line is comming from the main oil rifle. It might be a switch that won't let the starter engage if there is oil pressure, so when the engine is running, you can't accidentally hit the starter button and put the bendix into the ring gear.
CGarbee
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RE: Re: RE: NHC250 starter lock-out switch
WillWagner and Mike are absolutely correct...
(Can you tell what part of my M817 I've been working on today...
)
WillWagner and Mike are absolutely correct...
(Can you tell what part of my M817 I've been working on today...
)
Crash_AF
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RE: Re: RE: NHC250 starter lock-out switch
IIRC it is also there to prevent overspeed damage the starter after the engine fires if the switch is held in the start position too long.
Later,
Joe
IIRC it is also there to prevent overspeed damage the starter after the engine fires if the switch is held in the start position too long.
Later,
Joe
CGarbee
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RE: Re: RE: NHC250 starter lock-out switch
Yup, kills the starter circuit as soon as oil pressure builds and keeps it killed as long as it sees oil pressure...
Yup, kills the starter circuit as soon as oil pressure builds and keeps it killed as long as it sees oil pressure...
acetomatoco
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RE: Re: RE: NHC250 starter lock-out switch
Some women I know could use one on their minivans...
Some women I know could use one on their minivans...
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RE: Re: RE: NHC250 starter lock-out switch
Thanks, anybody know the pressure rating?
Guess some rewiring would be in order if a prelube system was installed....
Thanks, anybody know the pressure rating?
Guess some rewiring would be in order if a prelube system was installed....
jwaller
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RE: Re: RE: NHC250 starter lock-out switch
well this helps me some but I also notice it's showing a mechaical oil press gauge. thats cool too. you answered my question on the lockout switch. thanks. now I gotta find that piece under my dash.
well this helps me some but I also notice it's showing a mechaical oil press gauge. thats cool too. you answered my question on the lockout switch. thanks. now I gotta find that piece under my dash.
CGarbee
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RE: Re: RE: NHC250 starter lock-out switch
Better location diagram showing the starter lockout switch is located in TM 9-2320-260-34-1 on page 7-11 in the section 7-3. FRONT WIRING HARNESS REPLACEMENT... It should be pretty easy to find since it is the unit affixed to the t-fitting on the back of the oil pressure guage with an electrical wire comming off it... (I'd post the clip of the figure from the manual, but I'm feeling technically chalenged right now... )
I'm digging around to see what the specification on the switch is, but since the idle low oil pressure specification is 15-20 psi, I suspect that it is correspondingly low.
OK, the OIL PRESSURE LOCKOUT SWITCH is part number MS90530-2 (SWITCH, PRESSURE). Now, to find the specs on it...
Better location diagram showing the starter lockout switch is located in TM 9-2320-260-34-1 on page 7-11 in the section 7-3. FRONT WIRING HARNESS REPLACEMENT... It should be pretty easy to find since it is the unit affixed to the t-fitting on the back of the oil pressure guage with an electrical wire comming off it... (I'd post the clip of the figure from the manual, but I'm feeling technically chalenged right now...
)I'm digging around to see what the specification on the switch is, but since the idle low oil pressure specification is 15-20 psi, I suspect that it is correspondingly low.
OK, the OIL PRESSURE LOCKOUT SWITCH is part number MS90530-2 (SWITCH, PRESSURE). Now, to find the specs on it...