1HZ injector pump overhaul

[Frankenyota]

My injector pump on my turboed 1HZ-HZJ105 has started to leak diesel, so going to take it off and get overhauled.
Wanted to know if there are any upgrades worth while doing when they overhaul the pump?
ie boost compensator

Cheers
Matt

[dumbdunce]

is it only leaking from the top where the throttle spindle goes through the top cover? if so there is no need to remove the pump from the motor to fix it, and the parts are only few bucks from SMS diesel or similar.

if you are hell bent on taking the pump off, there are some mods you could do. you can have the bigger plunger from 1HD-T pump fitted, a boost compensator, but these are $$$ mods.

[T_Diesel]

I can highly recommend a boost compensator.

Makes a massive difference.

[dumbdunce]

I can highly recommend a boost compensator.

Makes a massive difference.

it makes no difference to power. it is an emissions device; it will cut out off-boost smoke and slow down the deposition of soot in the oil but it does nothing to increase maximum fuel delivery.

[T_Diesel]

I can highly recommend a boost compensator.

Makes a massive difference.

it makes no difference to power. it is an emissions device; it will cut out off-boost smoke and slow down the deposition of soot in the oil but it does nothing to increase maximum fuel delivery.

They actually control your fuel delivery according to boost pressure and how hard you put your foot down.

I have dyno print outs before and after to prove power increases and it has made a huge difference to my vehicle.

[dumbdunce]

I can highly recommend a boost compensator.

Makes a massive difference.

it makes no difference to power. it is an emissions device; it will cut out off-boost smoke and slow down the deposition of soot in the oil but it does nothing to increase maximum fuel delivery.

They actually control your fuel delivery according to boost pressure and how hard you put your foot down.

I have dyno print outs before and after to prove power increases and it has made a huge difference to my vehicle.

I'm sure your dyno printout makes you feel like you've spent your money well. the bottom line is the pump can be set up to deliver exactly the same amount of fuel with or without a boost compensator. it is an emissions device. it prevents overfuelling off boost.

if ultimate fuel economy or extended oil change intervals or no smoke off boost are important, they are a good idea. they do not make the engine make any more power.

[T_Diesel]

I can highly recommend a boost compensator.

Makes a massive difference.

it makes no difference to power. it is an emissions device; it will cut out off-boost smoke and slow down the deposition of soot in the oil but it does nothing to increase maximum fuel delivery.

They actually control your fuel delivery according to boost pressure and how hard you put your foot down.

I have dyno print outs before and after to prove power increases and it has made a huge difference to my vehicle.

I'm sure your dyno printout makes you feel like you've spent your money well. the bottom line is the pump can be set up to deliver exactly the same amount of fuel with or without a boost compensator. it is an emissions device. it prevents overfuelling off boost.

if ultimate fuel economy or extended oil change intervals or no smoke off boost are important, they are a good idea. they do not make the engine make any more power.

Yes I do like my dyno print out, and yes I do think they are a worthy investment.

The question was asked if there are any upgrades worth while doing when this bloke gets his injector pump overhauled. In my opinion and on my 1HZ-HZJ105 a boost compensator is a worthy investment.

On my 1Hz fitting a boost compensator made a huge difference in terms of soot emissions and also resulted in a noticable power increase.

Again, in my opinoin they are a worthy investment for an aftermarket turboed 1HZ and I experienced power increases as a result of fitting the boost compensator.

[dumbdunce]

...I experienced power increases as a result of fitting the boost compensator.

you experienced power increase as a result of more fuel delivered per shot (and possibly other changed like injection timing, injector service, other elements replaced as part of your pump overhaul). exactly the same power is available with or without a boost compensator.

I'm not saying you wasted your money - boost compensators are a good thing and will save you money on fuel and potentially can extend your oil change interval, but they do not and can not, increase the available power from a given fuel pump.

if that the same time you have a larger diameter plunger fitted, the pump then has the potential to deliver more fuel than the standard 1HZ pump. that said, the bigger plunger alone could be installed without a boost compensator, and would deliver the same maximum power - albeit with generally more smoke, less economy and dirtier oil.

[Frankenyota]

The pump is leaking at the cover on the side between the block and the injector pump, so i think it will have to come off anyway.
Was told that a bigger plunger is a costly exercise and with the standard DTS turbo set up the turbo is the limiting factor.
So not worth going to the bigger plunger unless i upgrade the turbo.
Would like to spend the money on an intercooler set up instead of another turbo.

I change the oil every 5,000 km so not to sure if the cost of the boost compensator is a good investment?
What sort of money for a boost compensator?
I know i will get less smoke and a little better economy but is it worth the dollars?
Is 200,000km about right for a injector pump overhaul?

cheers
Matt

[dumbdunce]

if it has to come off, take the whole truck to the diesel shop so they can time it properly when they put it back on.

200k km can be about right - some go for a million, some need a freshen up after 100,000km. the bost comp might add $500 - $800 on top of the pump overhaul, which might cost anywhere from $700 - $1000.

intercooler on its own will also not gain any (maybe a little bit) power, but it gives you breathing space and is good insurance. heat is the enemy of indirect injected diesels.

The pump is leaking at the cover on the side between the block and the injector pump, so i think it will have to come off anyway.
Was told that a bigger plunger is a costly exercise and with the standard DTS turbo set up the turbo is the limiting factor.
So not worth going to the bigger plunger unless i upgrade the turbo.
Would like to spend the money on an intercooler set up instead of another turbo.

I change the oil every 5,000 km so not to sure if the cost of the boost compensator is a good investment?
What sort of money for a boost compensator?
I know i will get less smoke and a little better economy but is it worth the dollars?
Is 200,000km about right for a injector pump overhaul?

cheers
Matt

[T_Diesel]

I change the oil every 5,000 km so not to sure if the cost of the boost compensator is a good investment?

I change my oil every 5,000 religiously aswell.

What sort of money for a boost compensator?

Mine was done by AgDiesel in Melbourne. I can't remember how much it was, but i'll check the invoice tonight and let you know.

I know i will get less smoke and a little better economy but is it worth the dollars?

Yes! You know you want one.

Is 200,000km about right for a injector pump overhaul?

That's about right.

[howesy]

wellI reckon your both right about the boost compensator i have no doubt it makes more power but thats because like the man said it allows the pump to be fuelled up to a point that normally wouldnt be possible without creating a James bond smoke screen. the compensator with the increased settings will allow the max amount of fuel right through without excessive smoke the rev range.
Had one on the hilux fitted by previous owner but as far as $800 ????
I got quoted $1500 to put one on the 1HZ and I dont reckon its worth that. After all I'm not out to drag race in it.

[Frankenyota]

Is it possible for fuel to leak from behind the black box on the rear of the pump?
It has 3 wires going into it. But i can't tell if it goes into the pump or not due to the black cover on it?

Matt

[Z()LTAN]

Yes, under that black box (anti theft unit) is the standard start/stop solenoid that could leak from its mounting seal.

If this is the case, its almost impossible to remove the black box without pulling the rotor head off the pump. I had to smash mine off lol

[Frankenyota]

Thanks for everyones input. It is being sent away for an overhaul today.

Cheers
Matt

[the_king]

Thanks for everyones input. It is being sent away for an overhaul today.

Cheers
Matt

Could you let us know where it was sent to and a rough price? Mine seems to be leaking in the joint below the fuel shut off where the pipes go into. Started unscrewing bits and pieces off an old 1hz i've got down the back and PING!, parts everywhere, I'm not even going to risk playing with it in the good car.

Cheers.

[Frankenyota]

Pump was sent to Diesel Power Systems in Kawana. They have done a bit of work for our workshop and seem to be good.
The price was estimated around $800, when the stripped it down the price went to $1,150.
Then he rang yesterday and said it needed another part, distribution head i think he said. So the grand total of $1,480.
Every time we send pumps to be overhauled they always end up costing more ( at different places aswell)
But you don't know until you strip them down and see exactly what they need.
This is why i tried a reseal myself first.

Maybe you should have just swapped pumps over King?
Should be able to buy a new seal for the fuel shut off switch?
If it's where the pipes go in i think it will be a overhaul.(distribution head)

Matt

[the_king]

Pump was sent to Diesel Power Systems in Kawana. They have done a bit of work for our workshop and seem to be good.
The price was estimated around $800, when the stripped it down the price went to $1,150.
Then he rang yesterday and said it needed another part, distribution head i think he said. So the grand total of $1,480.
Every time we send pumps to be overhauled they always end up costing more ( at different places aswell)
But you don't know until you strip them down and see exactly what they need.
This is why i tried a reseal myself first.

Maybe you should have just swapped pumps over King?
Should be able to buy a new seal for the fuel shut off switch?
If it's where the pipes go in i think it will be a overhaul.(distribution head)

Matt

Thanks for that, its around about what i expected.
And as for that other pump, its off an engine with 495000kms. I bought the whole car for $600, just to use the reco gearbox. It was a rollover, but until this injector pump, i've never had it off to a mechanic or paid for a part for it....but in saying that, its never had an engine problem.

The old boys a plant mechanic by trade, and he said his opinion when i asked if he wanted to rebuild it, lets just say it was an un-polite no haha.
I changed over the seal and the throttle spindle, checked everything was tight, but its still leaking (not as bad though, so I'm guessing there was more than one leak, the problem is, I can't actually see where its leaking. We stood there for probably an hour just staring, getting mirrors in at every possible angle, but just couldn't find A leak, the diesel just seemed to appear.

The real bitch of a thing is, while staring at the bottom of the engine for a good 15 minutes, i noticed the swivel hub is leaking, at least i can do that one myself.

Cheers Brock.