LC100 oil pressure
Submitted: Saturday, Aug 18, 2007 at 22:45
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48831
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Member - Charlie (WA)
Howdy all, the better half has shot through for the weekend so I had to
cook for the kids. Off to KFC we go (only because the kids want it of course.) Anyway, we're waiting in the drive through line for a while with the engine idling at about 600rpm and I notice that the oil pressure gauge needle is sitting on the lowest mark near the "L", give the engine a bit of a rev and the needle would rise momentarily. Pick up our meal and as we are driving back through town the needle was back up around 1/2 way.
I am sure in the past I would start the engine, the needle would take about 30 seconds to reach 1/2 way and stay there regardless of rev's.
Last weekend I did a oil & filter change as I do every 5000kms and nothing unusual there. Have checked the oil level a couple of times in the last week and all ok there.
Its a 2001 LC100 standard 4.2 diesel, what do you think, should I be worried.
Ta, Charlie
Reply By: Member - Tim - Stratford (VIC) - Sunday, Aug 19, 2007 at 00:39
Sunday, Aug 19, 2007 at 00:39
Charlie,
There has been some discussion on this on the LCOOL site over the past week.
A couple of ideas were that (1) The oil you replaced may be thinner
(2) There were a batch of guages that died or became faulty giving false readings.
In the end if the oil level is correct it is not too much of a concern - but most posts generally advise getting it checked at the next service.
AnswerID:
257880
Reply By: Member - Len B (NSW) - Sunday, Aug 19, 2007 at 10:19
Sunday, Aug 19, 2007 at 10:19
charlie,
my 100 series turbo diesel has had the same problem.. I replaced the oil gauage sensor and it corrected the problem for some time till it happened again. I have not bothered to replace the sensor again and the problem remains. We are talking some 3 years since the problem has returned and no ill effect on the vehicle.
I hope that will elay your fears of doing damage to your vehicle
Len
AnswerID:
257899
Reply By: MickeyJ - Sunday, Aug 19, 2007 at 12:45
Sunday, Aug 19, 2007 at 12:45
I had the same problem, which was fixed by replacing the sensor. If the oil light comes on as
well then you should worry.
Cheers
Mickey
AnswerID:
257916
Reply By: Member - Ed. C. (QLD) - Sunday, Aug 19, 2007 at 13:01
Sunday, Aug 19, 2007 at 13:01
If you think you have a problem, fit an _accurate_ (aftermarket) oil pressure gauge...
while you're at it, fit an oil temp. gauge as
well;-))
You will be amazed at the difference between cold/hot pressures, particularly at idle..
I think you'll find that the only problem you have, is one of perception;-))
Catch ya later... Ed. C
| Confucius say.....
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AnswerID:
257917
Reply By: Member - 'Lucy' - Sunday, Aug 19, 2007 at 16:50
Sunday, Aug 19, 2007 at 16:50
Did you use a genuine filter.
They are designed slightly different re 'valving'
The after market ones work just as good re filtering, however fall down re the valving side of things.
AnswerID:
257940
Follow Up By: Member - Charlie (WA) - Sunday, Aug 19, 2007 at 17:23
Sunday, Aug 19, 2007 at 17:23
Hi 'Lucy', yes I understand what you are saying and yes it is an after market filter, although I do not think this would be causing any problems. This is the same brand I have always used and we have 3 other LC100's at work that run the same brand and filter with no problems.
Charlie.
FollowupID:
519219
Follow Up By: Member - 'Lucy' - Sunday, Aug 19, 2007 at 17:41
Sunday, Aug 19, 2007 at 17:41
Ok then,
Possibility 'B' - change in type of oill
I normally use a 15/40, however got hold of some 10/40 which was ok, but caused the oil pressure guage to show a much lower reading.
FollowupID:
519223
Follow Up By: Member - Charlie (WA) - Sunday, Aug 19, 2007 at 21:33
Sunday, Aug 19, 2007 at 21:33
Same old oil as always. Name & type escapes me right now but it is a quality castrol diesel oil.
Charlie.
FollowupID:
519268
Follow Up By: Graeme - Monday, Aug 20, 2007 at 10:48
Monday, Aug 20, 2007 at 10:48
Charlie,
As you have 3 LC's at work, you have a perfect comparison check here.
Test the voltage and the current on the sender and compare yours with a couple of others. You should see a difference there that will highlight any reduced output from yours if ist the sender.
FollowupID:
519313
Follow Up By: Member - Charlie (WA) - Monday, Aug 20, 2007 at 13:36
Monday, Aug 20, 2007 at 13:36
I had thought of that Graeme, but the bloody things spend all of their time out in the field, Its pretty hard to lay your hands on one for a couple of hours,
Charlie.
FollowupID:
519338
Reply By: ross - Monday, Aug 20, 2007 at 11:14
Monday, Aug 20, 2007 at 11:14
"I am sure in the past I would start the engine, the needle would take about 30 seconds to reach 1/2 way and stay there regardless of rev's."
Are you sure you just never noticed before? I have 2 1HZ older models ,one of them recently rebuilt,and they have always behaved this way.
The pressure is relevant to how fast the oil pump is turning .
The manual says they only need about 6psi at idle.
The danger time is when oil shoots up high when cold and drops away to nothing regardless of rpm when warm.
The only way to find out what is happening is plug a mechanics mechanical gauge into your engine
AnswerID:
258047
Follow Up By: Member - Charlie (WA) - Monday, Aug 20, 2007 at 13:31
Monday, Aug 20, 2007 at 13:31
Thanks
ross, I think you may have given me the answer I was after. I wasn't a 100% sure if the pressure wasn't dropping prior to my situation the other night. That's why I asked the question, to find out if anybody else's vehicle behaved the same and yours is so my fears have been allayed. That's not to say I wont keep an eye on the gauge and on the oil pressure light.
Thank you everyone.
Charlie.
FollowupID:
519336