John D
Hi,
I have problem, sometimes the low oil light shut-down happens.:mad:
How can I solve this?

Model #: (05241)
Propane or Natural Gas:
Length of gas pipe feeding the generator:25’
Size of gas pipe feeding the generator:1”
How long since the last full maintenance:09/07
How long have you experienced this problem: on occasion, there is about 20 hrs on generator, after 8hrs break-in changed oil to Amsoil SAE 5W-30 Synthetic oil.

Description of problem: low oil light comes on/ shut down, oil level always OK


Steps you have taken to resolve problem: check oil, switch to off and back to auto.

Thanks,
John
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John D
Do you think I should replace the oil pressure switch, and see if that solves the problem?
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Namvet34
John,

There are many participants on this forum who are much more knowledgeable that me, but to get you started, I think you may be able to test the low oil pressure switch by disconnecting the leads to the switch and jumpering them out. This should tell you whether the switch is good or not. Perhaps someone with more experience in this area would care to comment on this.

Gene
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John D
The thing is Gene, it doesn't do it all the time. Like today it did its weekly thing with no problem.
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pcfrisch
3 posibilities come to mind. 1. The switch (could be intermittant) 2. Lousy connection between the switch and the board, 3. Bad control board.
I would replace the switch. :)
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John D
I was leaning towards a switch replacement myself as the first step. Thanks for the help and I will post if it solves the problem.

John
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Geoff Z
I would recommend swapping the switch to correct this. If the problem was happening all the time, I would want you to jump the switch and do a test and see if its the PCB. Remember, the oil pressure sensor is nothing more then a pressure switch. We don't see many of them go bad, but it does happen. Its a cheap part. Give us a call if you want one, I have 11 in stock.
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John D
I think this site has been spammed:-(
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John D
Well...

Well the low oil light problem started again, right after we lost power on one of our hottest days:mad: Did an oil & filter change and got it going again. A couple of days later I decided to install a pressure gauge just to see...well it starts out at 30 PSI and drops to 20# in 20 min. after a half hour it was down to 15#:eek:
Does anyone have an idea, I don't think this is normal.:confused:

John
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John D
What is normal oil pressure for a 005241 10 KW? cold and normal operating temp?

John
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johnc
Someone here should be able to tell you where to download the service manual, especially Skip. Wait for him to log on, to help you out.
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mastr
If it was my set, I would get rid of that 5w30 oil. It is probably about the same viscosity as water after a few minutes operation in hot weather.
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Skip Douglas SkipD
I think that [URL="http://www.guardiangenerators.com/PublicPDFs/0g4338revC.pdf"][U][COLOR=Blue]this Diagnostic Service Manual[/COLOR][/U][/URL] would be applicable to the 5241 generator. The engine is a GT530. Check out page 119.

I've been looking for an on-line GT530 engine manual but have had no luck so far.
Skip Douglas
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chucks bp
According to the Generac engine manual I have, the manual states that the engine has two oil pressure relief valve, one for cold temperature and one for normal operation. The manual states that the normal operation valve is set for approximately 40# of oil pressure. Both these relief valves are mounted within the generator side side cover of the engine. Another-words compete tear-down would be necessary to get to the check valves. That engine manual states that for all temperatures 5W30 synthetic oil is the recommended oil, any other Viscosity choice is to be changed with temperature extremes. Quick question are you using a genuine Generac filter, I have a JD tractor and my oil pressure will be significantly lower with off brand filters!!!
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chucks bp
According to the Generac engine manual I have, the manual states that the engine has two oil pressure relief valves, one for cold temperature and one for normal operation. The manual states that the normal operation valve is set for approximately 40# of oil pressure. Both these relief valves are mounted within the generator side side cover of the engine. Another-words compete tear-down would be necessary to get to the check valves. That engine manual states that for all temperatures 5W30 synthetic oil is the recommended oil, any other Viscosity choice is to be changed with temperature extremes. Quick question are you using a genuine Generac filter, I have a JD tractor and my oil pressure will be significantly lower with off brand filters!!!
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John D
chucks bp;9714 wrote:
According to the Generac engine manual I have, the manual states that the engine has two oil pressure relief valves, one for cold temperature and one for normal operation. The manual states that the normal operation valve is set for approximately 40# of oil pressure. Both these relief valves are mounted within the generator side side cover of the engine. Another-words compete tear-down would be necessary to get to the check valves. That engine manual states that for all temperatures 5W30 synthetic oil is the recommended oil, any other Viscosity choice is to be changed with temperature extremes. Quick question are you using a genuine Generac filter, I have a JD tractor and my oil pressure will be significantly lower with off brand filters!!!


Yes I do use genuine Generac oil filters and Amsoil 5W30 synthetic oil.
Does anyone have a linc to a tear down manual for the GT-530 engine?

John
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techntrek
I have one that covers the 760 and 990, don't know if it will help you at all. I can email it to you. I, too, couldn't find one for the 530.
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Skip Douglas SkipD
John D;9715 wrote:
Does anyone have a linc to a tear down manual foe the GT-530 engine?
I'd suggest that you call Kelly Myers at Ziller Electric (phone number at the top of this web page).
Skip Douglas
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John D
Update

[B][/B]

Got home from work and a neighbor told me when the power went out today the generator ran for awhile then stopped. So I bought a new liquid filled OP gauge (to replace the cheapo) and put it on and started it to check for leaks and I observed the oil filter gets hot but the inlet/outlet connections of the oil cooler don’t.
Plenty of air flow over the OC but the air is cool too. That tells me I have low/no oil flow thru the cooler.
That would explain the pressure dropping as it warns up over a short period of time. BTW the oil pressure was ~30 PSI with new gauge..
Hopefully this weekend I’ll have some time to see if the oil cooler is plugged or not.
Any ideas?

John
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chucks bp
In the 760/990 engine manual they state the oil pressure should be between 15#and 50# at 70 degree temperature, Huge range??? They also state that the oil pressure switch is set to shut down the engine at 8# of pressure, if this is the same switch used by the generator??? The Generac service manual for the 8 through 20KW generators states the low oil pressure cut off switch is 5# and the temperature cut off is 293 degrees F. Really no big deal between 5# and 8#. The oil flow in this engine is from the gear pump through the block at the oil pressure sending unit, out through the oil cooler back into the block, through the oil filter and then throughout the engine oiling system. Again this manual is a Generac manual but separate from the generator manual.
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chucks bp
Just a thought, but now that you have an accurate oil pressure gauge, why don't you "T" it in with the low pressure oil sending unit, leave it run when you have time to observe the situation and see what the oil pressure actually is when it shuts down. All you need is a "T" fitting and a short pipe nipple available at the hardware store. Probably 1/4 inch pipe??
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John D
chucks bp;9744 wrote:
Just a thought, but now that you have an accurate oil pressure gauge, why don't you "T" it in with the low pressure oil sending unit, leave it run when you have time to observe the situation and see what the oil pressure actually is when it shuts down. All you need is a "T" fitting and a short pipe nipple available at the hardware store. Probably 1/4 inch pipe??


Yes, I put a "T" in with the sending unit and first gauge because I plannded to leave it installed, and numbers mean more to me than lights.

John
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John D
Well

[B][/B]Well I had some time this morning and pulled the oil cooler off and found the restrictor plugged actually I could not find an orifice so…I started with a #.80 (0.0135”) drill but it was to short so I worked up to a #60 (0.040”) before I got thru. The restrictor is about an inch long inside the outlet nipple. Once I got solvent to flow thru I installed it and the cooler gets hot and the oil temp seams down.
I just found out about the new oil filters so I ordered some from Ziller. When they come in I’ll put one in and see if I solved my problem.
BTW does anyone know what the orifice size on the oil cooler should be?

John
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John D
Just ordered a new oil cooler from Ziller just to be on the safe side, should get it in a couple of days.

John
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John D
Fyi

I got my new oil cooler and to my suprise there is NO restrictor. So that tells me since day one I had no oil cooling before I drilled the 0.040" hole that provided some cooling:mad:
This I believe is a factory quality control issue and I plan to let them know.
I enclosed pictures to show everyone what to look for if they have a similar oil problem.
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