1993 Toyota Land Cruiser 80 Series 1HDT Engine oil filter draining?

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cu1HDTtoyota
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1993 Toyota Land Cruiser 80 Series 1HDT Engine oil filter draining?

Unread post by cu1HDTtoyota » December 28th, 2017, 6:25 pm

Hi, I have a 1993 Toyota Land Cruiser Turbo Diesel 4.2 ltr. 80 Series 1HDT. What is allowing the oil to run back to the sump emptying the filter? Is this a problem with the relief and check valves on the oil assembly? Any help on this would be greatly appreciated.
Manny

Peter Aawen
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Re: 1993 Toyota Land Cruiser 80 Series 1HDT Engine oil filter draining

Unread post by Peter Aawen » December 28th, 2017, 7:42 pm

The relief & check valves really don't stop the oil filter/s from draining; they usually only work to make sure that the oil is in the system & circulating at the right pressure.... the filter retaining oil once the pump & engine is no longer running is generally down to a non-return valve which should be built into the filter, IF there is one in there &/or your engine calls for one!! Many oil filters & engines simply don't have or specifically require such a valve, even if you'n I think it'd be smart to get/keep oil pressure up quickly on start-up!!

So if you find the oil is running back into the sump & consider this to be a problem for whatever reason, then I'd suggest you should talk to your filter supplier & make sure that whichever filter/s you are using actually have non-return valves &/or that your motor actually calls for this feature! ;)
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hoyks
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Re: 1993 Toyota Land Cruiser 80 Series 1HDT Engine oil filter draining?

Unread post by hoyks » December 28th, 2017, 10:14 pm

Is it a new issue, or been going on for a while?

There are a lot of counterfeit filters getting around that look like the genuine article. Maybe you got a dud filter.

wombats80
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Re: 1993 Toyota Land Cruiser 80 Series 1HDT Engine oil filter draining?

Unread post by wombats80 » January 10th, 2018, 12:41 pm

How do you know the oil is draining back out of the filter emptying it? The 1HDT uses a Z334 same as the 1HZ. Unless its a rubbish filter, they all have oil non-return feature. It's not unusual to remove the oil filter and have no oil run out making a mess, it doesn't mean at all that the filter is empty. I'm guessing you're looking at the time it's taken to gain oil pressure when you start up.

1640hunter
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Re: 1993 Toyota Land Cruiser 80 Series 1HDT Engine oil filter draining?

Unread post by 1640hunter » January 14th, 2018, 7:56 pm

I agree - why do you see it as a problem? Everyone one I've seen has drained back slowly - if you change the filter hot (ie normally) the filter will be full. If you change it cold the filter is pretty much empty. Doesn't seem to make a difference whether it's donaldson, baldwin, sakura, ryco etc. (as mentioned the drainback valve is in the filter). I don't worry about it

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