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Location:
Brisbane
Registered:
June 2002
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 The diesel 20V, intelligent answers please..
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Sun, 19 September 2004 06:31
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Just been for a test drive in an AE92 with a 20V conversion, Before I went for a drive I let the car run for about 5 minutes so as to let it warm up and it sounded fine, reasonably quiet. The car drove well enough, smooth and very willing to rev. When we returned I left the car running and opened the bonnet again. I could now hear the quite distinct "diesel" sound that some 20V's make.
How serious is it and what is it? I tried to listen for where the noise was coming from but couldn't determine exactly where, didn't sound like it was coming from specifically the VVT thing on the front of the cam, sounded more like the entire valve train. Could they just need adjusting?
Thanks,
Julian.
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Location:
Brisbane, QLD
Registered:
February 2003
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Re: The diesel 20V, intelligent answers please..
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Sun, 19 September 2004 09:09
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i've been told my 5m-e sounds a bit "dieselish"
we've pretty much narrowed it down to a bodgy exhaust manifold gasket
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Location:
Gold Coast
Registered:
October 2002
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Location:
Brisbane
Registered:
May 2002
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Re: The diesel 20V, intelligent answers please..
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Mon, 20 September 2004 02:49
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have a listen to the following video's of me testing my faulty VVT pulley.
http://www.rollamods.com/videos/sick20V1.avi
http://www.rollamods.com/videos/sick20V2.avi
That noise was caused by a stuffed VVT pulley, which I tested by manually activating the VVT mechanism and the noise goes away. I purchased a new pulley from toyota (very expensive) and the engine now has no valvetrain noises at all.
If you have a blacktop also inspect the hydraulic timing belt tensioner, it's a replacement part for the 100,000km service.
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Location:
Brisbane
Registered:
June 2002
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Re: The diesel 20V, intelligent answers please..
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Mon, 20 September 2004 03:05
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Thanks Jason,
It sort of sounds like that. Did yours do it from cold? was the noise distinctly from the VVT area? Any idea what part of the vvt mechanism was stuffed? How did you activate it manually?(so i can check and hopefully rule this out) last but by no means least how much if you don't mind me asking.
Cheers,
Julian
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Location:
Brisbane
Registered:
May 2002
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Re: The diesel 20V, intelligent answers please..
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Mon, 20 September 2004 03:15
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mine did it all the time.
I initially thought it was the shims all out of spec as it didn't seem to come directly from the VVT pulley.
There is apparently some damping fluid inside the pulley which leaks out along with a spring that wears out (I cant confirm this as I dont want to dissasemble my old one.)
You activate it manually by applying 12V to the VVT actuator with a couple of wires. I used two bits, from the pos and neg terminals of the battery.
The blacktop pulley retails for about $800AUD new, mine was about $475AUD from Japan via New Zealand. The silvertop item is a couple of hundred cheaper.
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Location:
Baulko Hillo
Registered:
April 2004
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Re: The diesel 20V, intelligent answers please..
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Mon, 20 September 2004 03:27
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Jason, did it affect the engine in any way permanently?
Cheers,
Jeremy.
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Location:
Brisbane
Registered:
May 2002
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Re: The diesel 20V, intelligent answers please..
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Mon, 20 September 2004 03:38
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the performance wasn't as great, one of the other guys in Sydney had one a bit worse than mine and the engine was useless on the street. It sounded like someone had dropped a jar of nuts and bolts down the intake.
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Location:
Baulko Hillo
Registered:
April 2004
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Re: The diesel 20V, intelligent answers please..
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Mon, 20 September 2004 03:41
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Was that just while it had the problem? Or was it shit even after it had been fixed?
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Location:
Brisbane
Registered:
May 2002
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Re: The diesel 20V, intelligent answers please..
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Mon, 20 September 2004 03:44
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with a new pulley on there, both motors sounded like any other Toyota EFI motor from the 90's. Perfectly smooth and no valvetrain noises. They still performed like most other 20V's though which isn't all that awe inspiring.
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Location:
Brisbane
Registered:
June 2002
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Re: The diesel 20V, intelligent answers please..
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Mon, 20 September 2004 07:09
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Jasonp1977,
you stated earlier that when testing your pulley the noise went away if you activated the vvt manually. Wouldn't that then indicate that there was something wrong with what activates it rather than mechanism itself? or am I missing something? (wouldn't be the first time)
Cheers,
Julian.
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Location:
Brisbane
Registered:
June 2002
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Re: The diesel 20V, intelligent answers please..
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Tue, 21 September 2004 08:07
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Jasonp1977,
you stated earlier that when testing your pulley the noise went away if you activated the vvt manually. Wouldn't that then indicate that there was something wrong with what activates it rather than mechanism itself? or am I missing something? (wouldn't be the first time)
Cheers,
Julian.
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Location:
Brisbane
Registered:
May 2002
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Re: The diesel 20V, intelligent answers please..
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Tue, 21 September 2004 08:10
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The noise is caused by a faulty pulley, due to the design of it's internals. Not the oil switching valve.
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Location:
Brisbane
Registered:
June 2002
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Re: The diesel 20V, intelligent answers please..
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Tue, 21 September 2004 08:27
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there you go...thought I was missing something.
So what exactly does the pulley do if it doesn't control the actuation of the VVT??
Did you dismantle your old one after replacing it to see what the problem was or if it would be repairable/rebuildable?
If you did do you have photos?
I have had a look through the blacktop manual but the pulley doesn't really get much of a mention at all.
Julian
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Location:
Brisbane
Registered:
May 2002
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Re: The diesel 20V, intelligent answers please..
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Tue, 21 September 2004 10:02
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the pulley is a non serviceable item according to toyota. I have photo's of one pulled apart somewhere, but I haven't pulled my broken one apart yet.
The pulley uses its internal gears and spring to activate the VVT when oil pressure is supplied to it, when it's not avtivated the spring etc is meant to hold the cam in the retarded position. If the gear is faulty there will be play in the pulley between the advanced and retarded positions when the oil pressure is not present (VVT off), which causes a valvetrain rattle.
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Location:
Brisbane
Registered:
June 2002
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Re: The diesel 20V, intelligent answers please..
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Tue, 21 September 2004 10:26
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Thanks Jason,
Nice description, now it all makes sense. I wouldn't mind having a look at the bits of yours one day if you do decide to take it apart. Alternatively, if you're gunna throw it out (it's non servicable after all) Then maybe I could swap you some amber liquid for it.....
I saw on club4ag someone said they paid AUD$800 for a blacktop pulley and thought a silvertop pulley was a few hundred cheaper....bloody hell!!
Any idea what causes them to die?
Cheers,
Julian.
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Location:
Brisbane
Registered:
May 2002
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Re: The diesel 20V, intelligent answers please..
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Tue, 21 September 2004 10:36
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that was my post on club4ag.
I ended up getting the blacktop pulley from NZ for about $475AUD shipped.
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Location:
Brisbane
Registered:
June 2002
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Re: The diesel 20V, intelligent answers please..
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Tue, 21 September 2004 10:59
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Thats a fair saving.
Is NZ a good source of 20V parts? Anyone in particular you would recommend or have used before?
Julian.
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