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Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

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  #1  
Old 09-21-2013
NH Bill's Avatar
NH Bill NH Bill is online now
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Default Yanmar /Kohler Oil pressure gauge or sender?

This morning I went to the garage to exercise the Yanmar/ Kohler. I do this monthly while we are not using the coach.... start it up, load it up and let er run for about 40 minutes.

Lately, I noticed the oil pressure gauge, which typically indicates about 25 to 30 psi (has done this since I owned it) was indicating lower and lower readings. All other indicators including temp (around 150) and charging around (13.2v +/-... it has its own alternator) and output on both legs (in the 110-120 V range) seem to be as they should be. I cleaned terminals at the sender and this helped for a while with oil pressure back to indicating 25 to 30.

Today however, after it was running and loaded up with 2 central airs and the charger the oil pressure gauge started going totally wonkey after about 20 min. It would drop to 0 than bounce back and forth like mad, stabilize for a short time then go crazy again. All the other indicators seem to be fine, output, temp, etc. Because of this, I don't think it is a serous problem. Total hours on the gen set in the 1,500 range.

Whats going on here? Is it the sender? Is it the gauge? Something else?

Looking for your thoughts. Whats the best way to trouble shoot this.

Thanks,

NH Bill
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  #2  
Old 09-21-2013
Friday1 Friday1 is offline
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Default Oil Pressure Gauge

Put a "T" at the engine and install a known good mechanical oil pressure gauge to confirm you have oil pressure.
The back of the gauge should have three posts, Ground or Earth or "-". Put a jumper wire from a known good ground to this post and see if that changes the reading.
12 VDC or "+" is another post so check for battery voltage here.
Sender or just "S" is the sender wire post. If you ground this post the gauge should show its highest reading or even more. If it doesnt show high, the gauge is bad.
Ground the wire at the engine and go along the wire twisting it as an assistant watches the gauge for the needle to drop from the highest reading. You have to have power on to make this work-make the needle go to a high reading.
Replace the guage and sender as a pair to make sure they are compatible.

Rick in Ohio
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  #3  
Old 09-22-2013
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Quote:
Originally Posted by Friday1 View Post
Put a "T" at the engine and install a known good mechanical oil pressure gauge to confirm you have oil pressure.
The back of the gauge should have three posts, Ground or Earth or "-". Put a jumper wire from a known good ground to this post and see if that changes the reading.
12 VDC or "+" is another post so check for battery voltage here.
Sender or just "S" is the sender wire post. If you ground this post the gauge should show its highest reading or even more. If it doesnt show high, the gauge is bad.
Ground the wire at the engine and go along the wire twisting it as an assistant watches the gauge for the needle to drop from the highest reading. You have to have power on to make this work-make the needle go to a high reading.
Replace the guage and sender as a pair to make sure they are compatible.

Rick in Ohio
Thanks Rick, I'll need to get a little help with this.

Where does the tee go?

NH Bill
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  #4  
Old 09-22-2013
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Bill- I would just get a cheap mechanical oil pressure gauge at Pep Boys and screw it in where the sending unit goes (usually 1/8" threads). That should tell you if the problem is with the old gauge or the oil pump. If you ground the wire from the sending unit to the old gauge, it should max out. That may also tell you if the gauge is bad. My money is on a faulty sending unit.
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  #5  
Old 09-23-2013
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Quote:
Originally Posted by sfedeli View Post
Bill- I would just get a cheap mechanical oil pressure gauge at Pep Boys and screw it in where the sending unit goes (usually 1/8" threads). That should tell you if the problem is with the old gauge or the oil pump. If you ground the wire from the sending unit to the old gauge, it should max out. That may also tell you if the gauge is bad. My money is on a faulty sending unit.
Thanks Shane.. This, I think I can do. Even better though, I got a Call from Ryan (Major Mod) Saari) this afternoon. He's coming over on Friday to take a look at it. Of course, Im buying lunch at Mazzaro's and you're welcome to join us!
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  #6  
Old 09-23-2013
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mmmmm.... Mazzarros! You and the simple farm boy have fun! Even if you don't get the bus fixed, lunch will be great. Wish I could be there.
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  #7  
Old 09-24-2013
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Quote:
Originally Posted by NH Bill View Post
Thanks Shane.. This, I think I can do. Even better though, I got a Call from Ryan (Major Mod) Saari) this afternoon. He's coming over on Friday to take a look at it. Of course, Im buying lunch at Mazzaro's and you're welcome to join us!


I'll be there for the FREE LUNCH and to offer a healthy dose of advise (otherwise known as nonsense)
Of course you will have to pick me up and bring me home
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  #8  
Old 09-24-2013
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I'll be there for the FREE LUNCH and to offer a healthy dose of advise (otherwise known as nonsense)
Of course you will have to pick me up and bring me home
Hey KC,

Welcome your free advise and will be glad to buy you lunch too.

However, I ain't comming to get you!

NH Bill
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  #9  
Old 09-24-2013
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"Put a "T" at the engine and install a known good mechanical oil pressure gauge to confirm you have oil pressure."

Don't install the "T" permanently. The engine vibration may cause the "T" to fatigue.

Been there.

Bill
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  #10  
Old 09-24-2013
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Mmmmmmmm Mazzarro's, drool baby, drool

http://www.mazzarosmarket.com/Home/t...8/Default.aspx
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