Diesel gurus, please help diagnose my 1HD-T

[ForealBoreal]

Louis aka lshobie knows a spot for cheap pumps that the mine trucks get done
Like 6 or 8 hundred
Pump would be an exchange thing

Nozzles for the 1hz are about 25 bucks each then double that for final cost per injector
I was told 300 for the set or something

I would probably deal with Fred Holmes in prince George as it is the closest injection shop

 

[Jan-78FJ40]

Sure man, that would be great. How much did the rebuilds cost you (injectors alone, not IP) and have they been fine since? Did it clear up your smoking issue if you had one?

I did them because the engine I bought had 400.000 km on it and I had a full rebuild done. I included pump and injectors, as to not put a tired pump onto a new engine. Injectors were 600, the pump over 1200.

All done at:
Omega Fuel Injection
1934 John Towers Avenue Ste B
El Cajon CA 92020
United States of America
Talk to Brian Clark, 619-448-3295

cheers,
jan

 

[roscoFJ73]

Yeah...I will try and change the fuel filter this weekend.



Good idea... is it 3/8 tube I'm looking for?

It should be 12mm internal diameter

See I didn't think 1L usage for 10,000km was bad at all. Though maybe that's just from my days owning a Honda

On average ,diesels tend to use slightly more oil than petrol engines,probably due to the higher compression.

There is no oil smell to the white smoke at all... only diesel smell.

White smoke can be from combustion that is too cool from injectors opening early.
What you are seeing is condensation

 

[asutherland]

@Rosco: What could cause the injectors to open early? The IP is timed correctly within factory spec.

 

[canucksafari]

@Rosco: What could cause the injectors to open early? The IP is timed correctly within factory spec.

Incorrect breaking pressure. This is one of the issues that John at ATEB mentioned with installing rebuilt two stage injectors - they rarely get the breaking pressure spot on.

You may want to talk to John or Rob at Radd for their opinion. I do remember Rob mentioning some time ago that it was very hard to get these two stage injectors rebuilt. With a single stage injector, you just have one breaking pressure to set.

 

[roscoFJ73]

@Rosco: What could cause the injectors to open early? The IP is timed correctly within factory spec.

Weak injector springs,they are pressure sensitive and when the springs lose tension,they open early.
My 1HZ had this problem at 200000klms but it wasnt making a huge amounts of smoke.
Its quite possible yours has missed the 100000klm injector service,not uncommon on JDM imports.
Doing the springs is all part of an injector service(done properly).

I know injectors cost money,but its hard to get everything right unless the injectors and pump are working in tandem.

 

[asutherland]

Thanks Rosco. What's the difference between an injector service and an injector rebuild?

 

[asutherland]

Also - I'm going to hook up a boost gauge I had laying around to see if I'm getting proper boost. Does anyone know

a) where to connect the vacuum line to, it's a mechanical gauge
b) what boost numbers I should be seeing on full load? - Never mind, found this: https://forum.ih8mud.com/diesel-tech-24-volts-systems/88076-hdj81-boost-levels.html

 

[ForealBoreal]

Also - I'm going to hook up a boost gauge I had laying around to see if I'm getting proper boost. Does anyone kno
a) where to connect the vacuum line to, it's a mechanical gauge
b) what boost numbers I should be seeing on full load? - Never mind, found this: https://forum.ih8mud.com/diesel-tech-24-volts-systems/88076-hdj81-boost-levels.html

Injector service or rebuild same thing in my eyes

A) tie it into the line going to your boost comp just trace the line it's easy to find

B) 10 psi is stock but it may creep slightly higher with time

 

[asutherland]

Here's another similar thread: https://forum.ih8mud.com/diesel-tec...2924-real-world-advice-tuning-smoky-1hdt.html

 

[roscoFJ73]

Thanks Rosco. What's the difference between an injector service and an injector rebuild?

Nothing ,its just the process of putting new tips on and adjusting the opening pressure.
Reconditioning would mean the same again.

 

[Tim-HJ61]

To the OP.

I'm guessing you've picked up in this thread that 1HDT have dual stage injectors. This means they are more complex internally than standard injectors and therefore a service/ rebuild will be more difficult for either a backyarder or a pro to do accurately. I.e more cost.

Tim

 

[rushglen]

Maybe not the cause of your problem but if you're going to overhaul your fuel system don't forget the fuel tank... interesting piece here:
Holy fuel tank full of crap, Batman! - Cantanko

 

[rushglen]

OK that url is mangled by this forum !

here is a working one: Holy fuel tank full of crap, Batman! - Cantanko

 

[sailor]

HDT injectors rebuilt at Fred Holmes recently $900 tax in. ouch. Big improvement in idling smoke. Stock hdj81 boost is around 11 psi max. I boosted to 14.5 this reduced full load and on boost smoke. John Voo adjusted the star wheel on my boost compensator to suit the 'power rod' that my truck came with from Japan. Nice improvement in on boost power just a puff of black when off boost. Check compression, valve clearances. Tune boost compensator and total fuel screw with pyrometer (got John Voo at Ateb to handle that one) . Still smokes but far better now. My injectors were leaking a bit before 'cracking'.

 

[asutherland]

Sailor, so should I get Fred Holmes to rebuild the injectors first and then get Ateb to tune everything?

 

[canucksafari]

Sailor, so should I get Fred Holmes to rebuild the injectors first and then get Ateb to tune everything?

If you ask John, he is going to tell you to buy new OEM injectors. We had a good discussion about this at the CC Christmas party and he was very adamant that no shop can properly rebuild these two stage injectors. I recommend you call him or whoever you want to install and tune before you get yours rebuilt.

 

[roscoFJ73]

If you ask John, he is going to tell you to buy new OEM injectors. We had a good discussion about this at the CC Christmas party and he was very adamant that no shop can properly rebuild these two stage injectors. I recommend you call him or whoever you want to install and tune before you get yours rebuilt.

Denso must have a way of calibrating them when they assemble the injectors and Toyota/Denso sell bits to rebuild the injectors,so they are obviously designed to be rebuilt.
Toyota are not the only ones to have a 2 stage injection system.
A lot of countries have strict rules on how much pollutants a diesel can put out and are reguarly tested,if they were not able to rebuild them properly,you would think there would be problems at the annual testing centres.

Im hoping someone can contact Fred Holmes and get a detailed explanation.

 

[sailor]

Yes, I would get exchange injectors from Australia or Malaysia if If I'd had the time. I wouldn't let a North American shop mess with 2 stage HDT injectors, the experience level is not there. This is my personal opinion. My truck had an indicated 160k on it, who knows if it has been rolled back? If you are at similar mileage, at least pull the injectors and check the spray patterns and pressures on a test jig. I use John and Phillip Voo at Ateb because they have the long tenure experience with these trucks far before the JDM import craze hit our shores. I would 1) do compression/ valve adjust 2) check tune on total fuel and boost compensator 3) check boost level 4) deal with injectors. To set the injection pump I went to Ateb and John did it mostly by 'feel'. He can check the injection timing with a Piezo thing as well. He has a 'Power Rod' that he installs in the boost compensator (Aneroid?) that adjusts the fuel delivery when on boost as well, requires a different parameter of adjustment to stock. I highly recommend this as it improved my rigs highway power immensely. I can easily pull overdrive on long hills where it used to shift down like HWY 1 north of second narrows etc. LanceCruiser had it done to his- same results..

All this is likely worthless, but my truck produced a haze of smoke idling before doing the injectors and was remarkably better after.

found a Vid of John Voo testing my old injectors...

http://youtu.be/xe37QkMvIhE

 

[canucksafari]

Denso must have a way of calibrating them when they assemble the injectors and Toyota/Denso sell bits to rebuild the injectors,so they are obviously designed to be rebuilt.
Toyota are not the only ones to have a 2 stage injection system.

I am not saying they are not designed to be rebuilt. I am saying, as Sailor notes, that so far shops here in North America have not been able to do a good job of it. As John explained it to me, they have a problem getting the breaking pressure exact on the second stage. The second stage comes into effect at operating temps. In John's experience, there tends to be too much variation in second stage breaking pressure with rebuilt injectors. When they first started prepping trucks for Outback Imports they were having them rebuilt (I don't know by whom). I suspect they would not waste time with shops known for cheap so so work. Anyways, they had customers coming back saying their trucks were not running right. They traced it down to slight variations in the second stage breaking pressures. Since then, they only recommend customers use new Denso two stage injectors.

I am sure John could explain this better than me.

On a side note, John also recommend that we avoid aftermarket injector tips (dual or single stage). He said trucks with as little as 30,000 kms on rebuilt injectors are coming in with worn injector tips. I 've got a set with aftermarket tips to go in over the holidays, so I should know in a year or so.