Toyota 1HZ oil consumption

Submitted: Monday, Jun 09, 2003 at 17:31
ThreadID: 5355 Views:8003 Replies:9 FollowUps:10
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I have a '95 Landcruiser with approx. 135K on it. Its a 1HZ standard non turbo diesel engine. I am the second owner and bought it with approx. 28K on it. The oil and filter is always changed every 5k using only Castrol RX Super. I've just returned from a road trip from Brisbane and used about 3+ litres of engine oil over about 5K's. Prior to this trip the oil consumption was minimal. The fuel economy hasn't changed and it's not blowing smoke, except for the obvious little bit of diesel smoke. No strange rattles in the engine. I've done a compression test on each cyclinder and they are all about the same and with good compression. I have noticed that the pressure within the engine (via the breather that goes from the top of the rocker cover into the inlet manifold) is high and this is obviously where the oil is going.

Can anybody offer advise as to why the sudden and dramatic oil consumotion and what could be done? Is the motor glazed? If so is this a problem and what are the options?
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Reply By: Member - Wherethehellawi - Monday, Jun 09, 2003 at 17:52

Monday, Jun 09, 2003 at 17:52
the engine block may be airtight and not relieving excess pressure via oil refill cap.
Make sure this is clean and not a cause. I assume it has a vent hole in it.

Had a petrol engine that lost all its oil in about 2 weeks of city driving ....took ages to find after all other tests etc... accidently left oil filler cap off and noticed didnt use any oil. mmmm does or could this also happen to deisels??? I am no motor mechanic but if filler cap is also relief and blocked then excees pressure forces oil out elsewhere. Richard
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Follow Up By: Member - Andrew- Tuesday, Jun 10, 2003 at 13:20

Tuesday, Jun 10, 2003 at 13:20
Hi Richard the Toyota ones are sealed and the Crancase ventilation system then takes over.
Andrew
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Follow Up By: Member - Wherethehellawi - Tuesday, Jun 10, 2003 at 15:33

Tuesday, Jun 10, 2003 at 15:33
Peter, my apologies for giving incorrect info and thanks Andrew for setting me straightRichard
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Follow Up By: Peter - Tuesday, Jun 10, 2003 at 19:37

Tuesday, Jun 10, 2003 at 19:37
No need to apologise. Thanks.
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Reply By: tour boy - Monday, Jun 09, 2003 at 20:14

Monday, Jun 09, 2003 at 20:14
Hi, the cap on a diesel should be sealed. On the last 1hz I owned it started using oil at 200k. Converted it to shell Rimula D (not rimula x as it is too heavy detergent) and oil consumption again was negligable untill I sold it at 280k and still going strong. Hope this helps.
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Follow Up By: Peter - Tuesday, Jun 10, 2003 at 19:38

Tuesday, Jun 10, 2003 at 19:38
I'm not sure if changing the oil is the answer yet.
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Reply By: Member - Andrew- Tuesday, Jun 10, 2003 at 13:28

Tuesday, Jun 10, 2003 at 13:28
Hi
Have you by chance added extracters or a freeflow muffler/exhaust to the motor? these can suck oil past the rings believe it or not.
If not then change oil again and see if anything changes...may be crap oil you got this time.
Andrew
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Follow Up By: Peter - Tuesday, Jun 10, 2003 at 19:41

Tuesday, Jun 10, 2003 at 19:41
Everything about the motor is standard. The possibility of a bad batch of oil was my first thought. I normally buy it in 20 ltr drums. As soon as I realised the problem I changed the oil and filter and the next drum was bought from a different distributor to make sure it was from a different batch. At this stage I'm waiting to see what happens with the next 5k.
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Reply By: Allyn (Pilbara) - Tuesday, Jun 10, 2003 at 14:02

Tuesday, Jun 10, 2003 at 14:02
Mine will do similar if I've been cruising around town and then do a long run or when it's approaching time for an oil change.
Oil type has a bit to do with it also as with the strong detergent based oils the detergent will burn.
I could stand corrected on that and there's far more knowledgeable people than I that I'm sure will chime in and offer advice too
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Follow Up By: Peter - Tuesday, Jun 10, 2003 at 19:42

Tuesday, Jun 10, 2003 at 19:42
I've considered that. The oil was changed for the trip.
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Reply By: tour boy - Tuesday, Jun 10, 2003 at 20:07

Tuesday, Jun 10, 2003 at 20:07
I tried penrite, penzoil and castrol rx all of which the 1hz chewed through. A diesel specialist told me to use rimula. Keep trying.
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Reply By: Member - Andrew- Tuesday, Jun 10, 2003 at 20:12

Tuesday, Jun 10, 2003 at 20:12
Ok
The early turbo diesel had bad rings in them. Excess blowby was their ailment too. My friend came up with a novel fix. Fit a small water trap from a pneumatic system to that breather, and it will catch the oil in the mist. Pour it back in every fuel stop.
By chance do u have a foam filter? Is it oiled alot??
Andrew
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Follow Up By: Peter - Tuesday, Jun 10, 2003 at 20:42

Tuesday, Jun 10, 2003 at 20:42
The vehicle has a snorkel which has always had a precleaner using a paper filter which is changed accordingly.

I'm also curious as to what causes the blowby and the sudden change in oil usage. The vehicle is basically hot run but I'm starting to think that the highway run may have just been cleaning a few things out.
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Reply By: Member - Andrew- Tuesday, Jun 10, 2003 at 20:52

Tuesday, Jun 10, 2003 at 20:52
The next step is to get a leak down test performed if you wish to see how good the rings are on each cylinder. This is expensive, and more thorough than a compression check. Another possibility is a change of oil to Castrol Turbomax (general concensus as the best for resisting burning)
There seems to be no reason why you are using more oil, another thing you could do is remove the precleaner top when you do those long stints at high revs as they are surprisingly restrictive, and might be sucking the oil up past the rings.
All theory though. my last 60 series had a turbo and gauge, and with the ram, it ran 9 psi, but same conditions with the precleaner donaldson, it ran 7psi.
Andrew
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Follow Up By: Peter - Friday, Jun 13, 2003 at 14:29

Friday, Jun 13, 2003 at 14:29
Thanks for the suggestions. I think I'll wait and see what happens with this current oil consumption over time.
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Reply By: Member - ADRIAN- Tuesday, Jun 10, 2003 at 23:54

Tuesday, Jun 10, 2003 at 23:54
peter
some times oil can get past oilo seal in front of pumps[injector pump]as the transfer pump is just behind the seal. and oil mixes with fuel and injected and burnt with fuel. we havent seen this problem with a 1hz eng. yet but plenty patrols/rodeos/navara all of have VEinject pump all same arrangement, and can cause considarable oil consumption.engines have been rebuilt only to find that the pumps were at fault in first place. this may not be your problem but well worth checking. usualy by taking the return line banjo bolt out of pump [this actualy acalibrated jet ] check bottom of b/bolt for black stain from oil,if this the case then that is where the oil is going.oil seal only can be replaced easily bup shaft usualy wears as well to replace that pump has to be completely dissasembled.

hope this helps DMECH
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Follow Up By: Peter - Friday, Jun 13, 2003 at 14:30

Friday, Jun 13, 2003 at 14:30
Thanks. I'll have a look and if it's alright I'll wait and see what the consumption is with this lot of oil.
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Reply By: scott - Thursday, Jul 03, 2003 at 22:21

Thursday, Jul 03, 2003 at 22:21
peter have you had any luck ? i have the same problem with mine but has supposedly been rebuilt about 30000 kms ago . do you see any smoke on take off . mine seems to blow apuff of smoke when it has been idling for a while
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Follow Up By: Peter - Friday, Jul 04, 2003 at 09:15

Friday, Jul 04, 2003 at 09:15
Scott, I have spoken to a range of mechanics from all over and nobody can give me a definitive answer. I did notice that the fuel economy was starting to alter and it was not starting as well as what it normally does. Yesterday I got the fuel system looked at and had it checked and serviced which included new nozzles. They said that one nozzle was very poor and the others were worn, the pressure was also down a bit. Since I've got it back it does run better. I follow the fuel economy today with a trip to Melb (2 hours away). The mechanic says the motor runs very well. At this stage I still don't know what the problem (if any) is. I don't want to do anything if it doesn't need it.
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