To: From: "phil gaukroger" Date: Sat, 20 Nov 2004 18:23:40 +1030 Subject: [lcool_aus] HDJ 79 Engine noise Reply-To: lcool_aus@yahoogroups.com I purchased a 2002 HDJ 79 with 70,000km a couple of weeks ago. It goes like a dream, but when you take the foot off the accelerator and use engine braking to slow down through the gears, the engine makes a deep hollow sound, that sounds a bit like the noise a prime mover's exhaust brake makes. Its a great sound :-)) but doesn't seem normal to me. I recall something said in the past about an "accumulator" being replaced under warranty on someone's 1HD-FTE troopie. Any ideas before I get an opinion from the dealer? Thanks, Phil Gaukroger 2002 HDJ 79=20 To: From: "Norm Needham" Date: Mon, 22 Nov 2004 13:52:26 +1100 Subject: Re: [lcool_aus] HDJ 79 Engine noise Reply-To: lcool_aus@yahoogroups.com From: "phil gaukroger" > I purchased a 2002 HDJ 79 with 70,000km a couple of weeks ago. > > It goes like a dream, but when you take the foot off the accelerator and > use engine braking to slow down through the gears, the engine makes a deep > hollow sound, that sounds a bit like the noise a prime mover's exhaust brake > makes. > > Its a great sound :-)) but doesn't seem normal to me. I recall something > said in the past about an "accumulator" being replaced under warranty on > someone's 1HD-FTE troopie. > > Any ideas before I get an opinion from the dealer? Good on ya Phil; another farm truck (they used to be known as "real" Land Cruisers;-). Mine makes that noise, and it is particularly noticeable with a light steady throttle at low speeds with a cold engine. I think it is simply induction noise being amplified through the snorkel. Cheers Norm Needham Tea Gardens - East Coast Australia HDJ79 To: lcool_aus@yahoogroups.com From: "Matt Pozzi" Date: Mon, 22 Nov 2004 05:13:00 -0000 Subject: [lcool_aus] Re: HDJ 79 Engine noise Reply-To: lcool_aus@yahoogroups.com --- In lcool_aus@yahoogroups.com, "Alan and Joyce" wrote: > Hi Norm, I was the person that Phil recalled mentioning the "noise" issue on > the 1HDFT in my 2001 troopie. > Toyota fitted an accumulator to the fuel lines on my vehicle - explaining > that the cause was similar to that experienced in domestic household water > pipes at times --ie a sort of hammering or hydraulicing in the fuel > lines --it certainly reduced the "noise"[ mine sounded like a mud flap being > caught in the tread of a front tyre as well as a loud groaning noise - it > only developed after about 30,000Ks from new]--I would not call it a "great > sound" -- > I have recently noticed that the groaning noise has returned slightly -after > around another 20,000 Ks but it is only slight --one thing I have noticed is > that there may have been a reduction in power from the engine since the > device was fitted but as we do not have any dynos in this neck of the woods > it is difficult to determine. > Water hammer in household pipes can cause severe damage so I hope there are > no expensive vehicle repairs in the future now that this accumulator has Alan and Norm, how interesting indeed! I too have a noise just like this and I seem to get it after a short time the engine has started ie warmed up. It occurs over 50 to 60km/hr and sounds just like what Alan has described. I have a Walbro pump in my truck so this may be part of the issue. I wonder= what it is, I can feel vibration in the floor in the vicinity of front right quarter of the vehicle. Not quite the right place for a fuel line related issue. I had it occur once a year or so back and found that regreasing the front uni solved that one. I wonder if I have a uni going, more than vibrating fuel lines. Interestingly it only started after I did the front axle seals, king pins and new bearings. I wonder if it more related to this than fuel lines in my case? It occurs both accelrating and decelerating and is not dependant on the wheel as applying the brakes does not seem to stop it or change it either nor can I feel any vibration here. My apologies if I have hijacked this thread as Alan's description of a mudflap and tyre tread is just what I hear! Matt To: From: "Greg Goulden" Date: Mon, 22 Nov 2004 16:25:33 +1100 Subject: RE: [lcool_aus] HDJ 79 Engine noise Reply-To: lcool_aus@yahoogroups.com -----Original Message----- From: Alan and Joyce [mailto:duncan@starwon.com.au] Hi Norm, I was the person that Phil recalled mentioning the "noise" issue on the 1HDFT in my 2001 troopie. Toyota fitted an accumulator to the fuel lines on my vehicle -explaining that the cause was similar to that experienced in domestic household water pipes at times --ie a sort of hammering or hydraulicing in the fuel lines --it certainly reduced the "noise"[ mine sounded like a mud flap being caught in the tread of a front tyre as well as a loud groaning noise - it only developed after about 30,000Ks from new]--I would not call it a "great sound" -- Alan, My "good book" describes the device as a "fuel damper" to "reduce vibration of the fuel return pipe" when discussing the release of the 100 series. Perhaps it wasn't deemed necessary initially on the farm truck versions ;-) Also, Phil's noise which Norm described as being an induction noise is usually taken care of by fitting those often funny shaped "boom boxes" on the intake plumbing. The correct terminology I believe is an "attenuator", does the HDJ79 have any of these (certainly they are more common in naturally aspirated engines)? Regards, Greg Goulden 2000 HDJ105 Melb. AU. To: From: "Craig Cheetham" Date: Mon, 22 Nov 2004 17:58:10 +1100 Subject: Re: [lcool_aus] Re: HDJ 79 Engine noise Reply-To: lcool_aus@yahoogroups.com ----- Original Message ----- From: "Matt Pozzi" Sent: Monday, November 22, 2004 4:13 PM > Alan and Norm, how interesting indeed! > > I too have a noise just like this and I seem to get it after a short > time the engine has started ie warmed up. It occurs over 50 to > 60km/hr and sounds just like what Alan has described. I have a > Walbro pump in my truck so this may be part of the issue. I wonder > what it is, I can feel vibration in the floor in the vicinity of > front right quarter of the vehicle. Not quite the right place for a > fuel line related issue. > > I had it occur once a year or so back and found that regreasing the > front uni solved that one. I wonder if I have a uni going, more than > vibrating fuel lines. > > Interestingly it only started after I did the front axle seals, king > pins and new bearings. I wonder if it more related to this than fuel > lines in my case? It occurs both accelrating and decelerating and is > not dependant on the wheel as applying the brakes does not seem to > stop it or change it either nor can I feel any vibration here. My > apologies if I have hijacked this thread as Alan's description of a > mudflap and tyre tread is just what I hear! > > Matt Gaday Matt. A good friend of mine was one of the first to report this identical noise you speak of to Toyota on his Turbo tray & they fitted the device Alan now has as a trial. They must of had alot of similar complaints as they kept ringing him up to see if it worked. Hasn't made the noise since. It took him nearly 2 years to get them to fix it but I'm sure if you went down now they would probably have one on the shelf. (not sure of the parts tech name) Concidering the vibration that was made, it was hard to believe that the fuel system was causing it. Cheers Craig...... HZJ105 Vic