JustHarry Posted November 27, 2021 Share Posted November 27, 2021 I checked fault codes by joining 2 terminals in the diagnostic plug. Still nothing. I doubt it's an ecu fault or there would be visual damage inside it. But there isnt . Maybe something in the pump decided to break? 1 Quote Link to comment Share on other sites More sharing options...
JustHarry Posted December 8, 2021 Share Posted December 8, 2021 Turns out the pump is fucked . Little bits of metal through it holding spill valve open so wasnt making pressure to the Injectors Mds in kaiapoi are currently doing a pump rebuild on it. 3 3 Quote Link to comment Share on other sites More sharing options...
Bling Posted December 10, 2021 Share Posted December 10, 2021 Not the ideal result, but at least that mystery is solved! 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Raizer Posted December 22, 2021 Popular Post Share Posted December 22, 2021 So yeah I made the front half of a new exhaust for my 1KZTE Pit Stop made the rear half And fuck it has made a drastic difference to the van!! Sounds tough, not stupid loud (VTNZ inspector reckons it's just right) and has all the turbo whistle. If I ever tried to cut a gap at an intersection or whatever I used to just pump out a cloud of black smoke while it thought about accelerating, but now the turbo keeps up with the diesel pump so no cloud just GO. 13 1 Quote Link to comment Share on other sites More sharing options...
ThePog Posted January 8, 2022 Share Posted January 8, 2022 Yo, I have a Nissan forklift with a wee 4 pot diesel in it. It leaks oil from the governor? housing in front of the pump. Does anyone know what engine this could be so I can search up removal and o ring replacement? I have had the plate off but there are springs and shit in there that I don't want to take off without knowing the rules... Any help appreciated. Quote Link to comment Share on other sites More sharing options...
ThePog Posted January 8, 2022 Share Posted January 8, 2022 Quote Link to comment Share on other sites More sharing options...
yetchh Posted January 8, 2022 Share Posted January 8, 2022 On 22/12/2021 at 20:46, Raizer said: So yeah I made the front half of a new exhaust for my 1KZTE Pit Stop made the rear half And fuck it has made a drastic difference to the van!! Sounds tough, not stupid loud (VTNZ inspector reckons it's just right) and has all the turbo whistle. If I ever tried to cut a gap at an intersection or whatever I used to just pump out a cloud of black smoke while it thought about accelerating, but now the turbo keeps up with the diesel pump so no cloud just GO. Have they not heard of mandrel bends? 2 Quote Link to comment Share on other sites More sharing options...
Raizer Posted January 8, 2022 Share Posted January 8, 2022 20 minutes ago, yetchh said: Have they not heard of mandrel bends? It's got mandrel bends over the diff at least (think I supplied them all tbh), rest looks like it's been made from mandrel offcuts. One day I might redo the rear section, but for now it's good enough, managed 9.8l-100k open road last week so it's doing the trick anyway. 4 Quote Link to comment Share on other sites More sharing options...
Unclejake Posted November 16, 2022 Share Posted November 16, 2022 Folks, it's probably not the injectors: Land Cruiser 1HZ 6 cylinder diesel with added turbo and > 400,000kms Injectors replaced last year Motor is very tired, burns oil and has bugger all compression. Runs smoothly on all six cylinders It'll get a freshen up very soon, but she suddenly developed a loud knock/clack and I have not driven it since Using a stethoscope the clack seems to be somewhere above #2 injector. Hard to be certain.... but the stethoscope test suggests the noise is from valve gear? The clack is absent on cold start-up but very loud after 60 seconds No obvious issues between OHC and valve buckets With the engine idling; For every 800 revolutions the clack is audible ~ 400 times (i.e. two revolutions = one loud clack) We've cracked open each injector fuel pipe (one by one) with engine running and no change in the noise, so I think that makes an injector unlikely to be the cause I can't see valve stems or springs as they're hidden under shimmed buckets Valve buckets all seem to go up and down when slowly rotation the assembly using the starter motor The clack/knock is loud enough to be heard from next door at idle. At one clack per two crank revolutions I'm thinking it's cam/single valve related but am otherwise perplexed. Could a broken valve spring make such a racket? Thoughts? Quote Link to comment Share on other sites More sharing options...
JustHarry Posted November 16, 2022 Share Posted November 16, 2022 @Unclejake Reading your post I had a very similar sounding noise from a 4d65 mitzy diesel in a mk2 mirage had a loud rattle /clack consistantly like it near drowned out the rest of the motor when idling All I could put it down to when the motor was stripped was excessive bore wear and it's just loud af pision slap You may have broken a piston skirt and that could be why it's only one noise and started suddenly :discdisclaimer: this is the internet and this is my story Results may vary 1 Quote Link to comment Share on other sites More sharing options...
Unclejake Posted November 16, 2022 Share Posted November 16, 2022 ^ If it's a piston (and it may well be mate) then it's apparently only making a noise once during four trips up or down the bore. If that's the case I'm guessing it's making a racket in response to detonation/combustion? Dunno. I was hoping not to touch the head and to only freshen the short-block Quote Link to comment Share on other sites More sharing options...
Beaver Posted November 16, 2022 Share Posted November 16, 2022 In my limited experience (three times) unexpected clacks/knocks from diesels have been injectors and/or pump related. Your results may vary. 1 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted November 16, 2022 Share Posted November 16, 2022 I'm not familiar with the HZ heads, do they run prechambers like the dirty L engines? They do come loose sometimes and give the piston a bit of a taptap. Edit: A quick google says yes they do. I'ma throw a guess that's what's up. 1 Quote Link to comment Share on other sites More sharing options...
Unclejake Posted November 16, 2022 Share Posted November 16, 2022 Not a scenario I'd considered at all my friend! I'll get the head off next week if possible If the pre-chamber was lose would it be likely to connect to the piston crown at every TDC (incl exhaust stroke)? If so then it seems a less likely culprit. Good lord inside diesel engines are dirty. I've only ever touched one before this one. It's yuck. Quote Link to comment Share on other sites More sharing options...
JustHarry Posted November 16, 2022 Share Posted November 16, 2022 How are you certain its not making noise evenery revolution? It's all happening many times a second so would be pretty hard to count Quote Link to comment Share on other sites More sharing options...
Yowzer Posted November 16, 2022 Share Posted November 16, 2022 19 minutes ago, Unclejake said: Not a scenario I'd considered at all my friend! I'll get the head off next week if possible If the pre-chamber was lose would it be likely to connect to the piston crown at every TDC (incl exhaust stroke)? If so then it seems a less likely culprit. Good lord inside diesel engines are dirty. I've only ever touched one before this one. It's yuck. They tend to drop down, get hit, stick back up for a bit before dropping down again so you do get weird intermittent knocks from them Quote Link to comment Share on other sites More sharing options...
Yowzer Posted November 16, 2022 Share Posted November 16, 2022 Sometimes they can rotate as well which causes weird running issues. The headgasket holds them up so they don't drop very far, damage is usually very minimal but you'd definitely wanna check the head for cracks. 1 Quote Link to comment Share on other sites More sharing options...
Unclejake Posted November 16, 2022 Share Posted November 16, 2022 37 minutes ago, JustHarry said: How are you certain its not making noise evenery revolution? It's all happening many times a second so would be pretty hard to count Good question. I captured 10 seconds of the noise with my voice recorder when the engine was at an indicated 800rpm idle. I slowed the playback down and counted each clack. 69 'clacks' for ten seconds = 414 clacks per minute... so roughly half engine RPM EDIT: Which made me think it was an injector, but effectively shutting off the fuel to each injector one by one did not eliminate the noise It's an interesting problem. I'll know more when I can tear the engine down (I need to work during the day and have no shed and few tools) but I need the vehicle by 9th December and getting parts to Chatham Island can take weeks so I need to get as much info as possible quickly 2 Quote Link to comment Share on other sites More sharing options...
Mof Posted November 16, 2022 Share Posted November 16, 2022 https://www.tapatalk.com/groups/aus80/tapping-knocking-noise-in-my-1hz-t10937.html https://www.certifiedautomotive.com.au/toyota-landcruiser-1hz-cracked-head/?amp=1 1 Quote Link to comment Share on other sites More sharing options...
Willdat? Posted November 18, 2022 Share Posted November 18, 2022 Hey team, a mate has bought an 2014 Pajero, 4M41 engine, 130km, he's wondering whether an EGR delete is an essential or not? I guess the wounders may have recovered from their tour @DoBro Jesus Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.