Yanmar oil pressure sender
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05-07-2008, 13:38
Post: #1
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Yanmar oil pressure sender
Does anyone have a NAPA (or otherwise) part number or cross reference
for the Yanmar generator oil pressure sending unit? My oil pressure sender appears to be shot. Gauge runs all the way to the right (highest possible pressure reading and then some) when operating. Also, should the gauge go back to 0 when the sending unit is disconnected? It doesn't. It does drop to between 60 and 90psi when I press the "stop" button to warm up the glow plugs, but goes right back to the top as soon as I hit "start". In fact, disconnecting the sending unit doesn't seem to have any effect whatsoever on the gauge. Just in case I replace the sending unit and that doesn't solve it, any other ideas would be appreciated. Thank you! -Ryan '86 PT-40 8V92 |
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05-07-2008, 19:27
Post: #2
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Yanmar oil pressure sender
Go to ww2.tflx.com for a gauge test guide. It probably also shows a sending unit for that gauge.
Leroy Eckert 1990 WB-40 Smoke N Mirrors Dahlonega, GA Royale Conversion Ryan Wright
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05-07-2008, 20:18
Post: #3
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Yanmar oil pressure sender
One other thing. I compiled a cross reference for Teleflex gauges a while back. It is in the files. I do not remember if it has the pn for the sender. It's worth a look.
Leroy Eckert 1990 WB-40 Smoke N Mirrors Dahlonega, GA Royale Conversion Ryan Wright
Be a better friend, newshound, and know-it-all with Yahoo! Mobile. [url=http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR...o8Wcj9tAcJ ] Try it now.[/url] |
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05-08-2008, 00:50
Post: #4
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Yanmar oil pressure sender
Ryan, The sending unit of the vintage Yanmar genset probably follows an SAE standard. Leroy's suggestion of the Teleflex site ww2.tflx.com was a good one. The sending unit is a variable resistive device with a linear output between approximately 240 and 33 ohms. With 0 lbs, the resistance should be around 240 ohms. You can check this with an ohmmeter (providing you disconnect the sending unit output wire) and reference to the body of the sending unit and/or engine ground if it has single wire output, if there are two output wires, you want to put the meter across both terminals. If the sending unit ever saw 100 lbs, the resistance should lower close to 33 ohms, half of that pressure (50 lbs) should produce a resistance close to 100 ohms. If you want to check the gauge, you could disconnect the wire from the sender on the gauge 'S' terminal, insert a temporary wire from the now disconnected sending unit to the gauge, turn the ignition key on and ground the sending unit. The gauge should read close to "0". IF you purchased the small ¼ watt resistor pack from Radio Shack for close to $6 or $7 dollars you could check the gauge by placing a resistor from the 'S' terminal of the gauge to ground. Full Scale Reading = 240 ohms (two 470 ohm resistors twisted in parallel will give you 235 ohms Medium Scale = approximately 100 ohms 0 reading = 33 ohms (a 47 ohm resistor is close, the gauge should almost read '0' ![]() If there is a question about wiring, you can leave the sending unit in place, remove the sending unit wire from the 'S' terminal on the oil pressure gauge and read the resistance to ground with an ohm meter. You should see something close to 240 ohms with the generator turned off. Theoretically, you should be able to short the gauge output 'S' terminal and see the gauge peg. WARNING! I did this recently, shorting the water temp sending unit wire temporarily to make sure I was hooking up the correct wire. The gauge pegged and stayed pegged. I've never had that happen. I didn't realize that would be hazardous to the meter movement. There's always something to learn. Donn 76 FC33 South Kingstown, RI From: WanderlodgeForum@yahoogroups.com [mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of Ryan Wright Sent: Wednesday, May 07, 2008 9:39 PM To: wanderlodgeforum Subject: [WanderlodgeForum] Yanmar oil pressure sender Does anyone have a NAPA (or otherwise) part number or cross reference for the Yanmar generator oil pressure sending unit? My oil pressure sender appears to be shot. Gauge runs all the way to the right (highest possible pressure reading and then some) when operating. Also, should the gauge go back to 0 when the sending unit is disconnected? It doesn't. It does drop to between 60 and 90psi when I press the "stop" button to warm up the glow plugs, but goes right back to the top as soon as I hit "start". In fact, disconnecting the sending unit doesn't seem to have any effect whatsoever on the gauge. Just in case I replace the sending unit and that doesn't solve it, any other ideas would be appreciated. Thank you! -Ryan |
05-08-2008, 02:06
Post: #5
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Yanmar oil pressure sender
Ryan,
From my Kohler parts catalog part number 258693 for the oil pressure sending unit. I've been able to call Kohler gen. parts places, give them the model, serial# and spec # of the generator and get parts. (Just ordered new slip rings and trying to work up the nerve to try to replace them myself). As far as the gauge not going back to zero. I don't think mine does either. It stays at where it was when I shut it down, until I start it again. Tom Sorrentino 1987 PT38 Bedford Hills, NY 12.5 KW yanmar/kohler --- In WanderlodgeForum@yahoogroups.com, "Ryan Wright" > > Does anyone have a NAPA (or otherwise) part number or cross reference > for the Yanmar generator oil pressure sending unit? My oil pressure > sender appears to be shot. Gauge runs all the way to the right > (highest possible pressure reading and then some) when operating. > > Also, should the gauge go back to 0 when the sending unit is > disconnected? It doesn't. It does drop to between 60 and 90psi when I > press the "stop" button to warm up the glow plugs, but goes right back > to the top as soon as I hit "start". In fact, disconnecting the > sending unit doesn't seem to have any effect whatsoever on the gauge. > > Just in case I replace the sending unit and that doesn't solve it, any > other ideas would be appreciated. > > Thank you! > > -Ryan > '86 PT-40 8V92 > |
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05-08-2008, 06:27
Post: #6
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Yanmar oil pressure sender
Thank you for the responses. I found the cross reference file Leroy
was talking about, and Donald, I really appreciate the testing instructions. Those will be a huge help. Thanks, Tom, for the part number and info on your gauge also staying where it was. -Ryan '86 PT-40 8V92 |
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