Cycling valve and excess oil consumption

[Hilux]

I thought I`d let you know about an issue I had recently, or should I say 2 issues.

I was told by Promax that my cycling valve had an issue (one of the tube `prongs` had broken off I believe) and it was prone to overboost.

I`d spent loads on the car so thought I`d do it myself. There was also a small weep on the sump plug (it left a penny size spot of oil on the floor when not used in a week or two.

I didnt do it of course what with a house extension and work and other things taking up my time.

However in the previous year the oil useage was quite high but I was comforted in the fact that it seemed to be in the normal region quoted on this forum but towards the high end ( I was also thinking of selling the car before it got too high, I dont mean to be mercenary but I really didnt want to rebuild the head or re-ring the engine etc)

I have been thrashing it around recently (sensibly) in preperation for a possible track day as it was sitting around so long as I need to see what will leak, start to fail or burst etc etc)

Since the cycling valve has been replaced it uses no oil................none..........................not a drop................zilch

Discuss..............................................................

 

[Diver944]

Hmmmmm, it's been a while since I had a cycling valve so I'm trying to remember where all the tubes lead to (most chipped/wastegated cars bypass the CV).

Could the problem have been diverting boost pressure into the crank and be pressurising the bottom end, thereby causing the sump leak?

A wierd one [&:]

 

[Fen]

Higher boost giving the turbo seals a harder time?

BTW I'm sending this from my spangly new iPhone, which have caused quite a stir down here.

 

[Diver944]

ORIGINAL: Fen

BTW I'm sending this from my spangly new iPhone, which have caused quite a stir down here.

I can imagine []

 

[pauly]

ORIGINAL: Fen


BTW I'm sending this from my spangly new iPhone, which have caused quite a stir down here.

Nah,

 

[Fen]

LOL. I'm genuinely sitting on the couch waiting until it's time to go and look at a house we might want to buy, which comes with a working woolshed on the property (the one I mentioned on Titanic we missed out on if anyone remembers - it's back on the market) and watching a TV programme about research into sheep that self dagg and don't grow wool under their bellies or on their faces.

Worse, I'm interested! Sheep are common "lawnmowers" over here and 8 acres is a big lawn so if I didn't have to dagg the things I might have a few myself...

 

[swright]

Interesting. Is the cycling valve an expensive and hard to fit part? Mine uses a bit of oil and it only burns it when the turbo kicks in. It doesn't smoke on the over run(like my old LUX used to) and certainly doesn't billow it out at high revs. It just seems to burn the same amount once the turbo is in at any revs. I was thinking maybe turbo seals but the cycling valve may be what i need to check.

Mine also has a crankshaft seal oil leak, could that be caused by said valve playing up?


Stu

 

[pauly]

ORIGINAL: Fen

Worse, I'm interested! Sheep are common "lawnmowers" over here and 8 acres is a big lawn so if I didn't have to dagg the things I might have a few myself...

Put a saddle on one and you've got a ride on lawnmower, er not welsh are you ?, I think that's another story in the valley's. []

 

[Hilux]

Its not impossible but its tucked away under the inlet manifold towards the bulkhead. Surgeons hands required so I am led to believe. I looked at it a couple of times, locked the garage back up and went and had a cup of tea [8|]

Edited to add that I had my car trailed by friends on occassion and it wasnt obviously burning oil but smelt oily when accelerating (which I would expect on a 20 year old turbo) so I cant see that it burned that much but it must have done. The exhaust is just as black and sooty as ever.

 

[sawood12]

Can't think why the cycling valve might be causing increased oil consumption. As Fen suggested it could be due to your boost spikes but they only occur momentarily and very occasionally. The output of the cycling vave is connected to the wastegate, and the two input to it come from the intercooler pipe banjo bolt and the J-boot after the AFM. I guess if there is a leak-path through the cycling valve internals such that high pressure air is leaking into the J-boot then that could be drawing more oil vapours up from through the AOS. Just a guess.

 

[zcacogp]

ORIGINAL: Fen
... dagg the things ...

Erm, I'm not sure I have come across the verb 'To Dagg' before.

Anyone care to enlighten me? The notion of self-dagging is particularly interesting ...


Oli.

 

[Fen]

A dagg is a lump of poo stuck to the wool around a sheep's backside. Dagging is the activity of removing the daggs. Doesn't sound like fun to me...

 

[Fen]

ORIGINAL: swright

Mine also has a crankshaft seal oil leak, could that be caused by said valve playing up?

In a word, no.

 

[Peter Empson]

ORIGINAL: Fen

A dagg is a lump of poo stuck to the wool around a sheep's backside. Dagging is the activity of removing the daggs. Doesn't sound like fun to me...

Just use a pressure washer and stand well back.

 

[zcacogp]

In my experience of sheep-farming (Lake District, where words like 'Dagg' haven't made much headway), you need to catch the sheep and pen it before even getting the pressure washer out of the land rover. Quite time consuming, and once again ends up sounding like a dodgy anti-Welsh joke ...


Oli.

 

[sawood12]

I havn't heard the phrase Dagg since the late '80's and early '90's episodes of Neighbours and Home and Away. The UK equivalent is a Winnet. A mate of mine at school was particularly hairy and his knickname was Winnet for reasons you can guess.

 

[appletonn]

Not a close friend, I'm guessing...?![]

 

[sawood12]

Not 'close' at all. Certainly not enough for me to confirm if his knickname applied!