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 Effect of valves ajustments on power and fuel

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galo55
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Home City : Québec Canada
Model and year : Hiace 4X4 Lh119v/1992 Pop-Up Camper
Registration date : 2009-01-12

PostSubject: Effect of valves ajustments on power and fuel   Mon Apr 06, 2009 2:41 am

Hi guys

I have a question about the 2.8 diesel engine / 3L.

1 - The adjustment of a valve does it affect the power and fuel consumption on the engine ?
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Clive
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PostSubject: Re: Effect of valves ajustments on power and fuel   Mon Apr 06, 2009 10:04 am

If a valve opens too little yes it does.
If it opens too much or not close at all yes it does.
BUT you would have other symptoms such as smoke, noise, bad starting and poor tick over.
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galo55
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Model and year : Hiace 4X4 Lh119v/1992 Pop-Up Camper
Registration date : 2009-01-12

PostSubject: Re: Effect of valves ajustments on power and fuel   Tue Apr 07, 2009 4:11 am

So if the engine has a good sound and power and no excessive smokea it is a good sign, even if it as 133000Km that does not mean it needs a valve adjustment.

Thank you for the information.
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zoochy
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Model and year : LH107G 1991
Registration date : 2007-01-21

PostSubject: Re: Effect of valves ajustments on power and fuel   Tue Apr 07, 2009 7:36 pm

I'm fairly certain the valves adjust themselves. Most vehicles newer than about 1980 don't need to have the valves adjusted.

at 133,000 km, that engine is barely broken in.
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chrisandhiace
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Model and year : LH 107 4wd 1992
Registration date : 2008-11-18

PostSubject: Re: Effect of valves ajustments on power and fuel   Wed Apr 08, 2009 1:15 am

I think they are manually adjusted via shim selection on the 2.8.
If there are no probs and the vehicle has had regualr oil changes etc. I'd leave alone.
Maybe the only time worth checking would be if the head was removed for some reason.
I assume self adjusting would be of the hydraulic variety.
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Clive
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PostSubject: Re: Effect of valves ajustments on power and fuel   Wed Apr 08, 2009 12:01 pm

Correct diesel ones are shim adjusted.

Petrol auto hydraulic adjustment.
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zoochy
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PostSubject: Re: Effect of valves ajustments on power and fuel   Wed Apr 08, 2009 7:50 pm

Thanks Clive.
Learned something today!
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Robbo
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Model and year : 2WD 1996 SC Living Saloon with automatic turbo diesel 3.0lt 1KZ-TE.
Registration date : 2008-02-16

PostSubject: Re: Effect of valves ajustments on power and fuel   Wed Apr 15, 2009 11:03 am

133,000 Km is not much for a decent diesel engine really. They should do 500,000 with good maintenance and considerate use I would think.

Ours will tick over 100,000 this week. Have to get the timing belt done and the thermostat.
I don't think it really needs anything especially serious done to it. Still sounds and goes good, no smoke unless it's driven very hard.
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AussieQ
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Model and year : 1994 sc
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PostSubject: Re: Effect of valves ajustments on power and fuel   Thu Apr 16, 2009 8:56 pm

You doing the belt and thermostat yourself Rob ? If not I'd be interested in what it costs Smile
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ruffnut
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PostSubject: Re: Effect of valves ajustments on power and fuel   Thu Apr 16, 2009 11:08 pm

aussie i had my belt done 4000 k's ago and a service it cost me $450 at our local ultra tune
cheers dave
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AussieQ
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PostSubject: Re: Effect of valves ajustments on power and fuel   Fri Apr 17, 2009 12:09 am

Thanks Dave, a few years ago I would have done it myself...getting lazy Smile

Kerry
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ruffnut
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PostSubject: Re: Effect of valves ajustments on power and fuel   Fri Apr 17, 2009 2:22 am

you and me both
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