low oil pressure at idle.

G

Guest

Guest
Hello all and welcome back Julian,
I have been having low oil pressure recently cannot say when it happened but
believe it could have been whilst driving through a muddy/watery area.
At first when cold the engine pressure on the gauge is reading about half
way but drop's 1/3 mark(maybe is half?). When fully warm its just above the
'L' Mark.
I have dropped the sump and examined the Big ends which were looking poor so
i have replaced them, I have also checked a couple of the mains when I was
there and they look ok.
So fired it back up (after putting oil in J) and pressure was still the
same, hooked up a pressure gauge to it and it reads 25psi when cold @idle
and 5 psi when fully warm, when warm it will rev around to 3000rpm no probs
and the pressure reads 37 psi.
The manufacture's specs are above 4.3psi idle and 18-42 psi @ 3000 revs, so
it would appear the engine is in spec according to the manufacture manual.
I replaced the sender gauge to no avail, still yet to check the oil pump and
relief valve.
My question is? Has anyone seen anything like this before? Is it the oil
pump before i pull it apart? Am i in specs with manufacture and just a
faulty dash meter?
The vehicle is a Land Cruiser II KZJ70 with a 1KZT engine, 3.0 diesel.
Thanks
Martin.
 
G

Guest

Guest
Martin,
It is in spec. so I think it is OK. The meters don't have PSI on
anymore to stop people worrying about pressure. You could increase the
pressure by using thicker oil but that is counter-productive, the
pressure is better but the oil is not getting round so easily. Your
meter may have thrown a wobbly and be not reading the same as it was.
I would trust the pressure gauge.
Regards,
Clive Marks
Home: +44 1293 514600
Mobile: +44 7821 491897
Skype: Cobminor
Crawley, West Sussex, UK.
 
G

Guest

Guest
Oil pressure at idle often surprises people. I might have suspected the
relief valve is stuck open but 25psi cold is reasonable. Suppose you have a
new and decent filter fitted?

Always liked the idea of an oil accumulator like those sold by MOCAL .


Malcolm Bagley
Stafford UK
FJ45 '75 & FJ45 '76

From: [Email address removed] [mailto:[Email address removed]] On
Behalf Of Martin Naylor
Sent: 08 May 2007 18:57
To: [Email address removed]
Subject: [ELCO] low oil pressure at idle.

Hello all and welcome back Julian,

I have been having low oil pressure recently cannot say when it happened but
believe it could have been whilst driving through a muddy/watery area.
At first when cold the engine pressure on the gauge is reading about half
way but drop=92s 1/3 mark(maybe is half?). When fully warm its just above the
=91L=92 Mark.
I have dropped the sump and examined the Big ends which were looking poor so
i have replaced them, I have also checked a couple of the mains when I was
there and they look ok.
So fired it back up (after putting oil in J) and pressure was still the
same, hooked up a pressure gauge to it and it reads 25psi when cold @idle
and 5 psi when fully warm, when warm it will rev around to 3000rpm no probs
and the pressure reads 37 psi.
The manufacture=92s specs are above 4.3psi idle and 18-42 psi @ 3000 revs, so
it would appear the engine is in spec according to the manufacture manual.

I replaced the sender gauge to no avail, still yet to check the oil pump and
relief valve.
My question is? Has anyone seen anything like this before? Is it the oil
pump before i pull it apart? Am i in specs with manufacture and just a
faulty dash meter?

The vehicle is a Land Cruiser II KZJ70 with a 1KZT engine, 3.0 diesel.

Thanks

Martin.



No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.467 / Virus Database: 269.6.5/792 - Release Date: 06/05/2007
21:01
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.467 / Virus Database: 269.6.5/792 - Release Date: 06/05/2007
21:01
 
G

Guest

Guest
Hi,
Yea i changed the filter after the pressure drop. Suppose i should check the
relief valve to make sure.
I wondered if the oil has a hard job escaping through the pressure relieve
when it's cold, but when the oil thins/ warms the oil can escape through the
valve easier, so gushes out if the valve is stuck?
Its possible I could have starved it of oil on a slope, but its been on
plenty of slopes before and never had a problem, maybe i should have had an
accumulator ;-)
Martin.
From: [Email address removed] [mailto:[Email address removed]] On
Behalf Of Malcolm Bagley
Sent: 08 May 2007 20:16
To: [Email address removed]
Subject: RE: [ELCO] low oil pressure at idle.
Oil pressure at idle often surprises people. I might have suspected the
relief valve is stuck open but 25psi cold is reasonable. Suppose you have a
new and decent filter fitted?
Always liked the idea of an oil accumulator like those sold by MOCAL .
Malcolm Bagley
Stafford UK
FJ45 '75 & FJ45 '76
 
Don't like the adverts? Remove them by becoming a supporting member.   Click here
G

Guest

Guest
Hi,
Its currently done 300 miles since the BEB change, so hopefully it will keep
going.
5 psi for idle just seems low and it would be interesting know what it
should be, going by the in car gauge it has dropped 15 psi of pressure @
idle, that's providing the gauge reads 0-60 psi, 5psi might start at the
halfway/1/3 mark with the in car gauge?
I will keep driving it and keep my eye on the pressure and see if it drops
anymore.
Also does anyone know what a receiver gauge is? Or am I being stupid(because
it actually the gauge in the dash), if so can it be replaced?
Thanks
Martin.
-----Original Message-----
From: [Email address removed] [mailto:[Email address removed]] On
Behalf Of Clive Marks
Sent: 08 May 2007 19:06
To: [Email address removed]
Subject: Re: [ELCO] low oil pressure at idle.
Martin,
It is in spec. so I think it is OK. The meters don't have PSI on
anymore to stop people worrying about pressure. You could increase the
pressure by using thicker oil but that is counter-productive, the
pressure is better but the oil is not getting round so easily. Your
meter may have thrown a wobbly and be not reading the same as it was.
I would trust the pressure gauge.
Regards,
Clive Marks
Home: +44 1293 514600
Mobile: +44 7821 491897
Skype: Cobminor
Crawley, West Sussex, UK.
 
G

Guest

Guest
Not sure what you meant by the question - were you asking where the receiver
for the gauge is? (as opposed to the sender which is on the engine) If so
yes the gauge is usually the receiver - don't think your LC would be
different. I have seen a generator with an engine mounted sender (4-20mA
output) which was connected to the control panel which could be remotely
monitored but also drove a local 0 to 10V gauge, can't imagine Toyota going
for that kind of sillyness.
Does the Haynes tell you how to check the sender / gauge?
I used to have a reference list for most common sender outputs of the
variable resistance type which when used with a portable scope is an easy
way of checking the gauge, I think though the list went west about 2 laptops
ago.
Malcolm Bagley
Stafford UK
FJ45 '75 & FJ45 '76
Also does anyone know what a receiver gauge is? Or am I being stupid(because
it actually the gauge in the dash), if so can it be replaced?
Thanks
Martin.
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.467 / Virus Database: 269.6.6/794 - Release Date: 08/05/2007
14:23
 
G

Guest

Guest
Martin,
Below is a similar problem and the cure as described some time ago on this list.
--
Rgds,
Roman (London, UK)
'92 HDJ80
==From: "Neil Paisnel" <[Email address removed]>
Subject: [ELCO] HJ60 Oil Pressure
Date: Sun, 29 May 2005 19:08:17 +0100
Reply-To: [Email address removed]
I have a 1982 HJ60 with 2H motor (6cyl diesel) 190,000 miles, 30k since
rebuild and new oil pump
At the end of last summer, I notices a sudden drop in oil pressure.
Oil level ok, gave engine oil flush and filter change. Still low
pressure. Since then have changed the oil pressure relief valve and
spring, still low oil pressure.
Took off electric sender and put in capillary gauge (in fact tried 3
different gauges). All gave 80 or so psi when cold at tickover, up or
so at 2500-300 rpm. Only a little lower when warm(ish)..only run up in
workshop, not on the road. This seems ok, if not a bit high? Bought
and fitted new sender. Still no change to indicated cockpit
reading.
On changing the sender, needed to remove the top off the centrifugal
filter, and noticed a crack and a small piece missing on the spinner
unit (on the lip where the 'O'ring sits). When the engine is started
with the cover off, oil pisses out of the crack, SO....new spinner
unit. Fitted.....still indicating low on the cockpit gauge.
The electrical cockpit gauge shows the correct resistance across the
winding....65 ohm, but so does a second hand one I tried that I know
is knackered, the needle is totally immovable on it.
I have ordered another gauge for the cluster. Since I have changed so
many other parts, and not had a result, I am not so hopeful that this
will give a result. So.....what the hell is going on? Anyone got any
ideas? I have the original Toyota service manual, but no specs to
say what the oil pressure figure should be in psi/bar. Even tried
the local diesel/engine machine shop. They have all the diesel spec
books, but no figures listed for this engine......all other Toyota
engines, yes, but not this one!!
Neil Paisnel
==Neil Paisnel <[Email address removed]>
reply-to [Email address removed]
to [Email address removed]
date Jul 26, 2005 11:06 AM
subject [ELCO] HJ60 oil pressure
Well, I finally got the factory oil pressure gauge reading correctly. It
was the display unit. The bi-metallic strip had become too hot and bent out
of shape, causing the needle to read incorrectly. I believe this was caused
by a failure/ sticking contact in the sender unit.
Neil Paisnel
==
 
  • Like
Reactions: Ballymena man!
G

Guest

Guest
Hi Malcolm,
Yes I meant the gauge, just seen a reference to it somewhere and they called
it the "receiver gauge" when searching the web, I thought it might be a unit
that sends the current to the gauge or something, that could be replaced
easy.
My manual is the Toyota Repair manual RM353E for 1KZT and does mention how
to test the sender unit.
I will try and find the body and chassis manual for 70 that I downloaded a
while back of birfield.com, although it's for the Heavy Duty not the Light
Duty should not make much of a difference.
Thanks
Martin.
-----Original Message-----
From: [Email address removed] [mailto:[Email address removed]] On
Behalf Of Malcolm Bagley
Sent: 10 May 2007 07:10
To: [Email address removed]
Subject: RE: [ELCO] low oil pressure at idle.
Not sure what you meant by the question - were you asking where the receiver
for the gauge is? (as opposed to the sender which is on the engine) If so
yes the gauge is usually the receiver - don't think your LC would be
different. I have seen a generator with an engine mounted sender (4-20mA
output) which was connected to the control panel which could be remotely
monitored but also drove a local 0 to 10V gauge, can't imagine Toyota going
for that kind of sillyness.
Does the Haynes tell you how to check the sender / gauge?
I used to have a reference list for most common sender outputs of the
variable resistance type which when used with a portable scope is an easy
way of checking the gauge, I think though the list went west about 2 laptops
ago.
Malcolm Bagley
Stafford UK
FJ45 '75 & FJ45 '76
 
G

Guest

Guest
Thanks Roman, i will give that a go if I can get it the meter out of the
dash.
It does seem possible it is the metallic strip on the gauge.
-----Original Message-----
From: [Email address removed] [mailto:[Email address removed]] On
Behalf Of Roman
Sent: 10 May 2007 08:53
To: [Email address removed]
Subject: Re: [ELCO] low oil pressure at idle.
Martin,
Below is a similar problem and the cure as described some time ago on this
list.
--
Rgds,
Roman (London, UK)
'92 HDJ80
 
G

Guest

Guest
About 3 months ago I checked the oil on my machine, and found it a
little way down the dip-stick, which surprised me slightly, so I topped
it up and thought "I'll check that again soon".
It must have been further off level than I thought, because when I
rechecked it later, on a properly level surface, it was a bit over the
"max" mark.
I didn't bother to drain out the extra 1/4 of a litre or so, because I
couldn't really see that it mattered very much: the engine is designed
to work at horrendous angles, 9.75 litres instead of 9.5 litres is not a
big difference and (conclusive argument) draining a little bit of oil is
a horribly messy job!
I mention it because one side-effect was that the oil pressure at idle
is noticeably higher on the gauge. It makes no difference to the peak
pressure when cold, I assume because that is limited by the bypass
valve, but it gives me a warm fuzzy feeling NOT seeing the gauge resting
on zero pressure when the engine is idling after getting really hot.
So... have I discovered a cheap and cheerful way of improving oil
pressure at idle, or are lots of people going to leap on me and tell me
that I've caused irreparable damage to heaven knows what seals etc?
(It's been like that for 3000 miles now, and nothing has exploded or
leaked yet!)
Christopher Bell
Devon, UK
1996 1HD-FT
____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses
 
G

Guest

Guest
Hi Martin
What type of oil are you using.
I ask because to possible confuse things a bit, I used to use Dino and my
oil pressure was higher than it is now on the synth.
It is now bearly over the first mark when at idle with the exeption of when
it is cold it will read over the second line but as soon as it reaches its
normal temp down the pressure goes or at least that what it says on the
guage.
Is the oil flow not more imprtant than the oil pressure.
I found the same as Christopher regarding the overfilling, that when you
have too much oil in the engine it will increas the pressure just a bit.
All the guys who worked on my engine always had it above the max mark on the
dip stick and simply said to me when I asked , sure it will just blow by the
rings or something simliar and not harm anything.
This could also be the same if you used a higher viscosity oil I presume
would that also increase the pressure a bit.
john 92HDJ 80 1HDT
 
G

Guest

Guest
Just to be clear here were talking about a little bit extra oil - not a
block 3/4 full with some sawdust to mask noises!
With no load having oil there is the most important, needed to keep the
metal to metal contact from happening.
Malcolm Bagley
Stafford UK
FJ45 '75 & FJ45 '76
-----Original Message-----
From: [Email address removed] [mailto:[Email address removed]] On
Behalf Of John Byrne
Sent: 10 May 2007 19:12
To: [Email address removed]
Subject: Re: [ELCO] low oil pressure at idle.
Is the oil flow not more imprtant than the oil pressure.
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.467 / Virus Database: 269.6.6/795 - Release Date: 09/05/2007
15:07
 
  • Like
Reactions: Ballymena man!
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock    No Thanks