80 Series - Oil Usage

Hi john,
one thing that can cause the oil to be forced through the bypass into the air ducting is blow back through the sump, usually and indication on worn rings, although in your case i hope not only 10k out of a rebuild. Although if the motor was not run in correctly, ie the bore was not sufficiantly scored, there may be some blow back (pressurisation of the sump). Suggest a compression test to confirm. and a word to the bloke who did the rebuild should be under warranty i would think. But what ever you do, don't tap that bypass line off, i have seen it done....what a mess!
Good luck pal, let me know how you go!
cheers,
the Wayne-o

Im with wayne - its not just cruisers but in any vehicle it indicates blow by from worn rings. My ihz does it (230k) but it does not use any significant amount of oil

Thanks Davo & Wayne

Motor has 1 year unlimited warranty. Have taken vehicle back to engine rebuilders for checking. Both compression and leak down test confirmed that there were no issues with rings and they have confirmed that no excess blowby is evident.

Strictly followed warranty conditions for running in motor.

John

Best way to check is to put a water trap in that line and see what amount of oil you catch. It could be oil leaking from the turbo seal aswell....why do u think it is the bypass supplying the oil if there is no bypass?? When the turbo is on song, there is alot more compression in there, id suggest the most probable reason is the bores/rings...but a oil catch can as sold on ebay, or the water trap wioll show it up.
Andrew

My old 80 series 1HZ had those tabs open enough to put your finger inside, closed them up to 1 or 2 mm my oil consumption went from 1 litre per 5000kms to nothing.

i did find before this that some oils burnt fast my best result was Castrol RX Super

Check with your mechanic and try a different oil

How much are you Using ?

John,
I am a Diesel mechanic and own a 80 series with a 1hdt engine which I rebuilt in november. These engines have a small brass restrictor in the oil feed to the head from the block. This part is very small and sits in the block. I didn't even notice it when I pulled it apart and cleaned the engine down. When i was about to put the engine back together a guy I work with told me about the restrictor(as he put one back together a few years back) so i had to order one as mine had gone missing. When i spoke to the place where the block, crank and head were done they didn't even know about it until they looked up their parts list. If this restrictor is not fitted 3-4 times as much oil ends up in the head which travels down the bypass hose and through the engine. If the engine didn't use oil down the bypass before the rebuild i can't see how it could be the rocker cover. It may not be this but you may have trouble getting this fixed as it is a big job to take the head back off. Good luck.

Mine typically uses about 1L per 1200km or so (300,000km). It's better on long highway runs (about half that at a guess). It was suggested some time ago that I check and adjust the tabs inside the rocker cover - it probably wont help in my case, however as I think I may have bigger issues. Never got around to doing it until today. Go to do it today and get all the bolts/nuts out/off, but the head wont come off - the A/C pipe that runs along the firewall seems it may have been repaired. There is, what looks like, a pipe joiner right in line with the rear right nut (as you stand at front of engine looking to back), and it is just the right size that it prevents me from getting the rocker cover off.

Does anybody else have this (ie. is it a standard fixture), or is it something specific to my truck only? I must say I was disappointed that I couldn't get it all apart!

Also, where does one buy Castrol RX Super? I've had it recommended to try, but I can't find it at Autobarn, Repco or Super Cheap. There's a few other independent auto shops where I live, but I haven't tried them yet. Any tips?