1HZ oil pressure (1 Viewer)

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Mickldo

Mickldo

Joined
Feb 18, 2006
Threads
17
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1,038
Location
Maryborough, QLD, Aust.
Does anybody have a FSM for a 1HZ? I have a Haynes manual somewhere but can't find it, I've got a sneaking suspicion that I lent it to a mate.:doh:

My oil pressure gauge (OEM) is reading slightly low lately so I want to check its accuracy with a mechanical gauge that I have. Who knows what the oil pressure specs for a 1HZ (or 1HD-T?) should be at idle and at revs?

I'm a little bit paranoid about the oil pressure at the moment as I also have an intermittant ticking noise coming from the engine bay. The noise has only happened twice and has disappeared before I can diagnose where it is coming from. Both the low oil pressure and the ticking have started only in the last week or two. Hopefully the ticking noise is unrelated to the gauge reading low, I just need some figures to compare my rig to factory specs.

BTW, the problems have only started since my last oil change. Nothing different to previous services. I use Caltex Delo 400 oil(15W40), Ryco Z334 filters and change them every 5000km and have done the same thing every 5000km since I bought my 80 at 200000km. It now has 321000km on it. I fitted my turbo at 280000km. I've never had any oil problems before.
 
can't help you on the pressure readings, but i can say that the ticking is most likely related. It's probably the sound of the tappets (or whatever the 1hz has) hitting the valves to open/close them, caused by lack of oil up there. I had a similar thing with my 2h. You can rev the motor a bit and the noise goes away (from bringing the pressure up)

It's probably the oil you're running if it's only just happened. What's the wether like a hervey bay atm? It can get hot there, so 15/40 might be a tad too thin. Also you might have gotten a dodgy or mislabled batch.

When I got my 60 I was rrunning 15/40. can't remember the brand but i remember using the same type when i had pressure probs. i switched to 20/50 of another brand (and i'm down in newcastle)) and pressure is where it's supposed to be at, fwiw.
 
Hi Mickldo. The oil pressure should be more than 29kpa at idle.(4.2 psi)
At 3000 rpm more than 245kpa(35.5)
I got 70 psi from my freshly rebuilt 1HZ upon startup but around 50-60 psi is good
 
The ticking is definitely not the tappets (1HZs use shims) I've had a tappet rattle for a while, it's a different noise to that. I first thought it was my injector pump as it made a similar noise just before it died at 270000km.

I've used the same oil for 120000km without any dramas. Both in summer and winter. The temp up here is typical Hervey Bay Autumn weather, slightly cool nights with mild days, so nothing out of the ordinary there. If it is an oil problem it is probably age/mileage related rather than temp related.

I just hope its not the big end bearing problem that HDJ80s had early on. Apparently the 1HZs used the same bearings as the 1HD-Ts so maybe mine are going since I've fitted the turbo?
 
roscoFJ73 said:
Hi Mickldo. The oil pressure should be more than 29kpa at idle.(4.2 psi)
At 3000 rpm more than 245kpa(35.5)
I got 70 psi from my freshly rebuilt 1HZ upon startup but around 50-60 psi is good
Click to expand...

Thanks Rosco,
I will use these figures to check the oil pressure properly before I second guess myself with my paranoia.

FWIW, if I didn't get these figures I was going to use the old standby figures of 10psi per 1000rpm. It's good to get the the proper figures though.

BTW, Do you have have a genuine FSM or a aftermarket one?
 
Mickldo said:
I just hope its not the big end bearing problem that HDJ80s had early on. Apparently the 1HZs used the same bearings as the 1HD-Ts so maybe mine are going since I've fitted the turbo?
Click to expand...

Ticking no good: Check them...Now!

The piece of mind will be priceless, and much cheaper then having it let go.

I've seen HZ with flaked bearings too, and yes, the HD-T and HZ use the same bearings.

People here have been having good experience fitting ACL's.

hth's

gb
 
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It has only happened a couple of times in past couple of weeks. The engine has been at operating temp each time and the noise has disappeared again before I can diagnose where it is coming from.

The ticking sounds higher pitched than a big end knock and it doesn't sound like a tappet rattle. The noise is there at idle and it speeds up with engine revs. It seems to come and go with no real warning. Even though the oil pressure gauge is reading low it doesn't change its reading at all when the ticking is there.

I think best case scenario is the ticking is just a loose bracket on the engine vibrating and the low oil pressure is just a bit of crud in the sender unit giving it a low reading.

Or the worst case scenario (I hope not) is the big ends are shot or maybe the injector pump.

I'm checking the oil pressure in the morning so I know whether to worry or not.
 
Mickldo said:
BTW, Do you have have a genuine FSM or a aftermarket one?
Click to expand...

I have the Gregorys and the FSM and they each say the same thing.
The Gregorys is more 1HZ oriented with lots of 1HZ pics and is certainly worth $29.95
The FSM orientates toward the 1HD T and uses only diagrams

Another tip is to do the test warm and see how long it can hold a good pressure.
2 minutes is long enough at 3000:D
 
Last edited:
roscoFJ73 said:
Hi Mickldo. The oil pressure should be more than 29kpa at idle.(4.2 psi)
At 3000 rpm more than 245kpa(35.5)
I got 70 psi from my freshly rebuilt 1HZ upon startup but around 50-60 psi is good
Click to expand...

Good news, after many interruptions over the weekend I've finally got my oil pressure gauge installed. It's only mounted in a cheap accessory gauge bracket but at least it's there.

The first inital tests are good, 250Kpa at idle and 500Kpa at 2500rpm. These readings were taken with a slightly warm motor, I will keep an eye on the gauge over the next couple of days to get some cold start up and hot running figures.

So far the ticking noise hasn't returned so I hope there is no serious problem there. At least I've got the gauge hooked up now to see if the ticking is an engine related problem.

Thanks guys for your help with this little drama of mine.:beer::beer:

:cheers:Mick
 
Have you been able to narrow down the area that the ticking is coming from.

I get a ticking noise that comes from the bell housing area sometimes. I had never noticed it until a bloke asked me how long it had been doing it because his did the same thing. But as usual whenever the cruiser is at the mechanics it won't do it
 
The ticking noise seems to be coming from the left hand side of the motor. My initial thought was that it was coming from the injector pump. A while back, just before I got my turbo, my injector pump died. A plunger or valve or something (can't remember now) punched out of the side of the pump housing, it still ran but it was spraying diesel everywhere. When it did this it made a ticking noise very simillar to the noise it makes now. I had the injector pump rebuilt at the time (about $1400) with a new housing and the rest of the bits that needed replacing. I had tuning problems with the cruiser after the rebuild so I took it to a different diesel speciallist who tuned it properly. It's got me wondering if the original diesel guy didn't fix the pump properly and the noise I'm getting intermittently is the same plunger (or whatever) doing the same thing again.
 
Results from today's travels.

Initial cold start up- 350Kpa

Hot idle- 150-175Kpa

Hot cruising at 100Km/h- 450Kpa

The factory gauge isn't very resposive is it. It doesn't seem to move much while driving whereas the aftermarket gauge swings from 150-500Kpa as you change through the gears. The needle on the OEM gauge swings maybe 1 or 2 degrees whereas the aftermarkets needle swings maybe 90 degrees. I knew the oil pressure changes with the revs but haven't seen the speed that it changes while driving as graphically before. I've only ever done oil pressure tests in the workshop before, never on the road. You learn something new every day.
 
Aussie cruiser said:
Have you been able to narrow down the area that the ticking is coming from.

I get a ticking noise that comes from the bell housing area sometimes. I had never noticed it until a bloke asked me how long it had been doing it because his did the same thing. But as usual whenever the cruiser is at the mechanics it won't do it
Click to expand...

I've got a ticking noise from that area too. It's different to the noise I'm concerned about though. I think the bellhousing tick might be a tick coming from the exhaust. Mine made it all the time until I fitted the turbo and 3" exhaust. The ticking went away for a bit but now it is starting to come back. I reckon it is coming from the flex joint. Not really concerned about this tick though I might have a listen with my stethoscope one day to see if I can narrow this one down a bit.
 
The flex joint is the area that the noise comes from but it seems to come from further under. It is worth a check it would be nice if that is all it is. I'll have a listen on the weekend
 
Aussie cruiser said:
The flex joint is the area that the noise comes from but it seems to come from further under. It is worth a check it would be nice if that is all it is. I'll have a listen on the weekend
Click to expand...

It maybe the beginning of the end for a flange gasket;)
 
I am glad you have eliminated the BEB's as the cause. I would suggest it may be wise however, seeing as you turbo'd it at 280,000kms, that you budget for and do the BEB's with ACL some point soon. HZ's do not seem impervious to the flaking issue, and adding a turbo increases the possibility.

I know of two HDJ81's in Canada now that had slight ticking...owners were cautioned to replace the BEB's, and now require complete engine rebuild/replacing...due to BEB failure.

Better to pull it apart now and find no issue, then take chances imo.

hth's

gb
 
One of the PM jobs I have planned for the not so distant future is to replace the big ends. I'm just postponing it until the boss installs a new hoist into our workshop. I don't have access to a hoist ATM and I don't feel like lieing on my back to do the job and having black diesel oil drip all over me with out being able to dodge out of the way.
 
Mickldo said:
One of the PM jobs I have planned for the not so distant future is to replace the big ends. I'm just postponing it until the boss installs a new hoist into our workshop. I don't have access to a hoist ATM and I don't feel like lieing on my back to do the job and having black diesel oil drip all over me with out being able to dodge out of the way.
Click to expand...
LOL!!
ain't that the truth...
 
Drain the oil and then leave it stand overnight. Then drop the sump and wipe it dry.:D
Mine was ok when we put the turbo oil return line in the sump.;) Come on Aussie.[mick] :D LOL. hey cus.;)
 
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