Hey everyone,
I'm having an on going issue with my hdj80 that I just can't seem to figure out.
During my last road trip I suddenly noticed an odd sound coming from the engine bay. The noise sounds sort of like a siren sound or a whine. I did not hear any "bang" or "boom" sound that triggered the noise, the noise just appeared out of nowhere. I quickly learned that the sound was only present when I would get on the gas and the turbo would spool up. The truck was and is still drive-able. I finished up the road trip with the remaining 1,500 miles after the noise started.
Things I have troubleshooted so far:
o Replaced vacuum line going to the wastegate because the one on there was a little cracked
o Removed and inspected all hoses from the intake to the turbo and the intercooler to the turbo
o Replaced lower turbo inlet hose with a mishimoto silicone hose since the old one had cracked right where the clamp goes
o Replaced all clamps with "t bolt" clamps
o Attempted a boost leak test, but the system will not hold pressure at all. The moment I release the air hose trigger, it loses all pressure. I was still able to find and fix two small leaks near the intercooler. I can see and hear gases/air coming out of the bottom of the "catch can" from the PCV when I do the test.
o I checked the compressor shaft and there was very very slight in and out movement. All fins looked okay from what I could see.
Things to note:
o Normal boost that I see is around 18-20 PSI. Fluctuates a little with temperature
o EGTs still seem very similar to before. Probe is on the exhaust manifold. I typically drive around 120kph or 75mph even when climbing long grades. I see around 1100 F and spikes of around 1250 F when climbing Colorado mountains passes at around 10,000 ft in elevation.
o Not a factory turbo setup. PO installed some sort of hybrid setup with a CT26 turbine (exhaust) side and unknown, no brand compressor (intake) side
o HPD water to air Intercooler set up also installed by PO
o PO installed an oil "catch can" looking apparatus that just dumps the gases and oil from the pcv straight down next to the frame (see photos)
o When a boost leak test is performed there is pressure built up in the PCV system and I can see and hear gases/air coming out of the bottom of the "catch can"
o Since the incident happened there has been an excessive amount of blowby. When the oil cap is removed at idle it smokes excessively out of the valve cover
o There was very little blowby before the incident/noise started
o There is no oil consumption between oil changes just like before the incident (no change)
o The entire oil return hose on the turbo is caked with oil and grime
o No noise at normal idle at 600 RPM, only when the RPMs increase and boost is made. Can begin to hear the noise if idle is increased to about 800 ish and higher
o The noise is still present even with all belts disconnected
o The noise is very obviously coming from the US passenger side/turbo side of the engine bay
My main questions for the Turbo/diesel gurus are:
o Can a blown/bad turbo cause pressurization of the crankcase and create this false blowby issue and the noise?
o Can bad turbo seals be allowing exhaust into the oil return hose and then into the engine, causing the pressurization?
o Can damaged or broken fins from the compressor wheel be causing this sound?
o What should I troubleshoot, inspect, or test next?
My next plan of action is to go ahead and replace the turbo. After researching and reading posts from a ton of different Diesel forums, some people had very similar issues with the pressure in the crank case and similar reports of the noise. Replacing the turbo seemed to fix the issue for some of the OPs of those posts. I was thinking about getting a Kinugawa Billet CT26 GT3071R or mamba CT26 GT3071R. I was leaning towards the Kinugawa just because it is in stock at the moment. The Gturbos look great but they are quite expensive and not currently in stock. My budget is about 1000 USD for a new turbo. Huge plus if the turbo comes with fast shipping to the USA.
I will attach photos that I think are relevant and the video of the sound.
Any help or advice is very appreciated. Thank you for your time and help!
I'm having an on going issue with my hdj80 that I just can't seem to figure out.
During my last road trip I suddenly noticed an odd sound coming from the engine bay. The noise sounds sort of like a siren sound or a whine. I did not hear any "bang" or "boom" sound that triggered the noise, the noise just appeared out of nowhere. I quickly learned that the sound was only present when I would get on the gas and the turbo would spool up. The truck was and is still drive-able. I finished up the road trip with the remaining 1,500 miles after the noise started.
Things I have troubleshooted so far:
o Replaced vacuum line going to the wastegate because the one on there was a little cracked
o Removed and inspected all hoses from the intake to the turbo and the intercooler to the turbo
o Replaced lower turbo inlet hose with a mishimoto silicone hose since the old one had cracked right where the clamp goes
o Replaced all clamps with "t bolt" clamps
o Attempted a boost leak test, but the system will not hold pressure at all. The moment I release the air hose trigger, it loses all pressure. I was still able to find and fix two small leaks near the intercooler. I can see and hear gases/air coming out of the bottom of the "catch can" from the PCV when I do the test.
o I checked the compressor shaft and there was very very slight in and out movement. All fins looked okay from what I could see.
Things to note:
o Normal boost that I see is around 18-20 PSI. Fluctuates a little with temperature
o EGTs still seem very similar to before. Probe is on the exhaust manifold. I typically drive around 120kph or 75mph even when climbing long grades. I see around 1100 F and spikes of around 1250 F when climbing Colorado mountains passes at around 10,000 ft in elevation.
o Not a factory turbo setup. PO installed some sort of hybrid setup with a CT26 turbine (exhaust) side and unknown, no brand compressor (intake) side
o HPD water to air Intercooler set up also installed by PO
o PO installed an oil "catch can" looking apparatus that just dumps the gases and oil from the pcv straight down next to the frame (see photos)
o When a boost leak test is performed there is pressure built up in the PCV system and I can see and hear gases/air coming out of the bottom of the "catch can"
o Since the incident happened there has been an excessive amount of blowby. When the oil cap is removed at idle it smokes excessively out of the valve cover
o There was very little blowby before the incident/noise started
o There is no oil consumption between oil changes just like before the incident (no change)
o The entire oil return hose on the turbo is caked with oil and grime
o No noise at normal idle at 600 RPM, only when the RPMs increase and boost is made. Can begin to hear the noise if idle is increased to about 800 ish and higher
o The noise is still present even with all belts disconnected
o The noise is very obviously coming from the US passenger side/turbo side of the engine bay
My main questions for the Turbo/diesel gurus are:
o Can a blown/bad turbo cause pressurization of the crankcase and create this false blowby issue and the noise?
o Can bad turbo seals be allowing exhaust into the oil return hose and then into the engine, causing the pressurization?
o Can damaged or broken fins from the compressor wheel be causing this sound?
o What should I troubleshoot, inspect, or test next?
My next plan of action is to go ahead and replace the turbo. After researching and reading posts from a ton of different Diesel forums, some people had very similar issues with the pressure in the crank case and similar reports of the noise. Replacing the turbo seemed to fix the issue for some of the OPs of those posts. I was thinking about getting a Kinugawa Billet CT26 GT3071R or mamba CT26 GT3071R. I was leaning towards the Kinugawa just because it is in stock at the moment. The Gturbos look great but they are quite expensive and not currently in stock. My budget is about 1000 USD for a new turbo. Huge plus if the turbo comes with fast shipping to the USA.
I will attach photos that I think are relevant and the video of the sound.
Any help or advice is very appreciated. Thank you for your time and help!
to make it all fit as is 
