Big problem with my 4jb1

[TMatty]

Hay.. Long story, please read it all and help me out!

First of all, it started to not start and stall when it did start, people told me it was the water trap and pump on top, so i changed that and nothing. So then i was told it was the bushes at the front of the diesel pump.

Question 1, Does that mean a full pump overhaul or is there a cheaper way out? Its really anoying spraying 'start ya bastard' every time (when its cold)

Problem 2, When i drive around town it runs perfectly, makes good power and blows small amounts of diesel smoke, But as soon as i get onto the highway for more then a minute it starts to blow alot of oil smoke, It "Diesels" and when i pull off and let it idle the oil light comes on, But as soon as i rev it over 1k RPM it tuns off. some times after a highway run it will blow a ball of oil smoke on start up. Does this mean the motor is sad and needs a rebuild? or could it be something like valve stem seals? (if they even have them? im not up on my diesel motors) Also after any sort of driving when i open the oil cap its smoky and alot of oil is in the intake from the rocker breather pipe.

Thanks
Matt.

[MrBIGHORN]

Do a compression test and if its not good you are in for a rebuild.
If the test is good then it mite be valve seals or turbo.

Good luck
Chris

[Demonic]

Re the oil, when did you last do an oil change? and did you fill it right upto the full mark on the dipstick? Isuzus dont like being on the full, they prefer to be just under that mark.

Re fuel problem. You could get it rebuilt, but is may be cheaper to locate a 2nd hand one. if you have no luck in Aus try one of the NZ Isuzu 2nd hand parts places, freight may be a little but may also still be cheaper then a total rebuild.

[nighthawk]

You can do the valve seals without pulling the head off as well, cheap fix.

[TMatty]

it burns/uses that much oil i need to top it up about once every 2 weeks, so being too much isnt a problem 90% of the time, I was asking the dude at Carbitz (trade parts suppler) and he recommended trying a thicker non diesel oil.. i did and didnt help at all..

[wbski007]

first of all I would start off checking the simple things, on the hard starting, I would check the glo plugs to see if their working or not, you say you changed the fuel filter, make sure there are no leaks and no lines are sucking air, make sure the sock at the end of fuel line in tank is not clogged, you can apply a little air pressure to the in comming fuel line where it enters the fuel filter, if the sock is glogged this will give it a temporay fix, it sounds to me you have fuel problems.
Cheers, Wayne

[Ralphie]

I would check the turbo seals. If it is hard starting and burning oil. it could be the seals in the turbo have gone. This puts a lot of oil in the intake manifold. Easiest way to check, is to remove the discharge hose from the turbo, and run the engine. It will make a lot of noise, but you can then see if there is any oil spewing from the turbo when you rev it up. Much easier fix than an engine rebuild.

[TMatty]

The turbo was replaced not long ago so i dont think its that.. And if i did take the pressure pipe off i can near say there will be oil as its comming out the rocker breather pipe then into the intake of the turbo.

Ill take it down and get a compression test tomorrow, Man i hate this car!

Thanks
Matt.

[geeves]

It does sound like rebuild time. What milage and how regular has the serviceing been?

[wbski007]

if you read what he said in his orignal post it sounds more like a fuel and glo plug problem, not starting when its cold, but starts on either and running ok around town but not on the road, sounds like its starving for fuel, No! as for the oil problem, he may be over filling it?

[TMatty]

i got the car with 140k on it, its now got 165k.

I service it myself every 7-10k. it doesn't seem to be starving for fuel, it has a small amount of black smoke under load or heavy driving.

I got the car off an old guy that used it around his farm, so unknown when it was serviced then, now come to think about it being a farm ute prob not too much.

I dont think the not starting is glow prob, it just dosnt have the fuel, its draining back into the tank. I can manualy prime it and fill the fuel filter and then it will start. was told it was the plunger ontop of the water trap, changed that and nothing so then was told it much be the injector pump.

im going to try and get it compression tested today and get back to with the results.

[wbski007]

you can get a one way inline valve( I bought mine at a boat place) it only lets the fuel go in one direction, that will stop the drain back, but sounds like you have other problems as well, must be sucking air somewhere for fuel to be draining back into tank? wish I could be more help. let us know what your machanic says,
Cheers, Wayne

[geeves]

Low compression can cause poor cold starting but your description of pumping up the priming pump does not sound good for the pump. Oil changes should of been every 5000km

[TMatty]

Yeh.. my mech took one look at it and heard it.. "Yep, shes dead, rings"

So.. now to find another motor.. Anyone got a half cut sitting around? Or a Motor..He also said the pump might be ok, but i dont think so as the fuel is draining back..

If some one has something sitting around in Australia, call or sms me 0432158011. A local shop can do a reco exchange for 3900, rebuilt on site but i dont have that much or want a new motor..

Matt.

[geeves]

Take the head off before condemning the engine. The isuzu diesel has chrome bores that only wear if badly abused. A set of rings and bearings is only a few hundred plus labour

[wbski007]

I go along with Geeves, if its only rings thats a fairley easy fix, must have alot of milage on it for the rings to be gone, or pourly taken care of.

[geeves]

Ive seen a few motors where no oil changes have eaten the bearings to the point that the pistons kiss the valves. By that stage theres not much left worth saving. Also with the old high sulphur diesel a truck that did a lot of short trips would corrode the upper part of the cylinder. Happens slower on a chrome bore but does happen. Farm trucks quite often goe to the back of the farm and back and thats about it although in Aussi that might be a 3 day drive.
You never know till the heads off which isnt a lot of work

[MrBIGHORN]

Its OK. Better find something new and better for you.

What are you on and can i have some