Offroad-Express

I got this big horn for $200 and am either going to fix it or sell it in parts. Was wondering if anybody has any ideas about what might be wrong with the engine. When i first started it up it made a random (ie not consistant) tinking noise and then went fine for a little bit, I drove it down the street and back and it started making the noise in the vid. Stalled once and now makes the noise consistantly. Drives ok (well did in the couple of hundred meters i drove it)

any ideas?
http://www.4wdtv.co.nz/node/420

Cheers Pete

sounds top end like a sticky lifter, my daewoo work vehicle had exactly the same noise, had to get the lifters replaced.

A good engine flush and a teflon based treatment may help (before replacing the lifters the service company put in an additive every 5000K to stop the noise)

big end gone and piston slapping head.

wopass wrote:big end gone and piston slapping head.

That was more my thoughs. Its pretty loud. Though the fact that it went ok for a little bit makes me think there is a possibility it could be valves or something (i was told it had a bad nock and surely it wouldn't change to being ok for a little bit if it was big end?).

What all is involved in fixing if its the big end. The whole thing only cost me $200 and apart from the engine its a bit rough but a pretty sound truck. In the end I'm out to make a profit but even if i spend a grand on the engine I would sill be winning and I would realy like to give it a go to learn.

Pete

Petemcc wrote:

wopass wrote:big end gone and piston slapping head.

That was more my thoughs. Its pretty loud. Though the fact that it went ok for a little bit makes me think there is a possibility it could be valves or something (i was told it had a bad nock and surely it wouldn't change to being ok for a little bit if it was big end?).

What all is involved in fixing if its the big end. The whole thing only cost me $200 and apart from the engine its a bit rough but a pretty sound truck. In the end I'm out to make a profit but even if i spend a grand on the engine I would sill be winning and I would realy like to give it a go to learn.

Pete

drain the engine oil thru a sieve (siv) check it for white metal bits,pull the sump off and check play in the rods to crank. easy to check..... if it is a big end you can rotate the crank to get the offending piston to the bottom,pop the cap off,push the piston up to the top of the bore,this gives you room to work on the crank bearing journal,get some very fine emry tape(180 grit) and polish the journal to get all the melted bearing off,do the same to the cap and rod. then throw a new set of bearings in it and clean out the oil pick up and strainer etc then box it up,do a couple of quick oil changes to get rid of any shit in the oil system.....then sell it to someone you dont know...it may last years or days.

sounds easy eh

wopass wrote:sounds easy eh

yet another TUI ad

sounds like its worth a try any way. I assume the piston hitting the head might have caused some damage??

Petemcc wrote:sounds like its worth a try any way. I assume the piston hitting the head might have caused some damage??

its the best and fastest way to find out if the bottom end is ok yes. if one of the big ends has gone by the sounds of the noise i would say its only started going so you will have to give each rod a good shove around to see which one it is,it may also be blatantly obvious. with it being a minor failior the top end should be ok(if your selling it to someone you dont know)

pull the sump off and check anyway. i may be wrong...in fact...im wrong a lot...according to her... im wrong all the time

Bit of a pain that ifs is in the way. Ill se how i get on. Im sure campbell will be thrilled to give me a hand when we get back to uni

Cheers Pete

Petemcc wrote:Bit of a pain that ifs is in the way. Ill se how i get on. Im sure campbell will be thrilled to give me a hand when we get back to uni

Cheers Pete

should still be able to get the sump off i would have thought ?

he will be a very tired and lucky boy after Mel has had him

It is old diesel technology, using indirect, or pre-ignition chambers.

One has come loose and is rattling around in it's socket.

Drive on!!

Is the noise there at ALL engine/road speeds and load?

It may be a gudgeon pin instead.


still lean towards pre-ignition chamber.

wopass wrote:big end gone and piston slapping head.

Would of thought he would stuff all oil pressure if that was the problem
sounds more like a rocker arm
but I know F all about diesels

91Rangie wrote:

wopass wrote:big end gone and piston slapping head.

Would of thought he would stuff all oil pressure if that was the problem
sounds more like a rocker arm
but I know F all about diesels

could very well be.... pop the rocker cover off to find out

Moriarty wrote:It is old diesel technology, using indirect, or pre-ignition chambers.

One has come loose and is rattling around in it's socket.

Drive on!!

Is the noise there at ALL engine/road speeds and load?

It may be a gudgeon pin instead.


still lean towards pre-ignition chamber.

Wrong terminology, meant to say, pre-combustion chamber.

stupid man!!

Moriarty wrote:

Moriarty wrote:It is old diesel technology, using indirect, or pre-ignition chambers.

One has come loose and is rattling around in it's socket.

Drive on!!

Is the noise there at ALL engine/road speeds and load?

It may be a gudgeon pin instead.


still lean towards pre-ignition chamber.

Wrong terminology, meant to say, pre-combustion chamber.

stupid man!!

tell me more... How do I find out if its that? Its there all the time now. It is a pretty loud knock.

wopass wrote:

91Rangie wrote:

wopass wrote:big end gone and piston slapping head.

Would of thought he would stuff all oil pressure if that was the problem
sounds more like a rocker arm
but I know F all about diesels

could very well be.... pop the rocker cover off to find out

I took the rocker cover off and couldn't really see anything wrong but didn't really know what to look for. Would it be obvious if there was something wrong?

Pete

pull the engine out and start stripping it, what have you got to loose? be a good learning experiance and everyone loves a project or side project

Petemcc wrote:

wopass wrote:

91Rangie wrote:

wopass wrote:big end gone and piston slapping head.

Would of thought he would stuff all oil pressure if that was the problem
sounds more like a rocker arm
but I know F all about diesels

could very well be.... pop the rocker cover off to find out

I took the rocker cover off and couldn't really see anything wrong but didn't really know what to look for. Would it be obvious if there was something wrong?

Pete

rotate crank so its at TDC then check rockers to valve clearance(give stuff a wiggle),should be a little gap (0.018"...ish) on the ones that are closed and then rotate crank another rotation and chech the rest that were open but now are closed.... if any have massive amounts of freeplay then thats your problem. and have a good close look at the cam shaft for any signs of wear and gouging etc

did that make sence ?

wopass wrote:rotate crank so its at TDC then check rockers to valve clearance(give stuff a wiggle),should be a little gap (0.018"...ish) on the ones that are closed and then rotate crank another rotation and chech the rest that were open but now are closed.... if any have massive amounts of freeplay then thats your problem. and have a good close look at the cam shaft for any signs of wear and gouging etc

did that make sence ?

If it's the 4JG2 engine it will be pushrod. The valve clearance is 0.4mm

yea i have seen people checking valve clearances before should be able to give it a go. Yep it is push rod. If this was stuffed then is the noise the valve hitting the piston?? I don't imagine i could fix it by just adjusting the valve clearances. I would be taking the head off and putting in a new valve and stuff i assume?

Nope, what they are getting at is that it sounds like excessive clearence between the rocker arm and the top of the valve. It could also be a sticking lifter if that is the case. It does sound quite metalic. (through my laptop speakers)

Through my computer it doesn't sound like a heavy enough knock to be a big end, an you would have zero oil pressure if a big end had failed.

It doesn't sound like injector knock either, as its not sharp enough. It usually sounds like a really sharp "Crack" like bashing two rocks together. Try cracking all of the injectors one at a time and see if it goes away though.

What ever it is, its only effecting one cyclinder My vote is with something on the valve gear, then if not, an injector.

Wrong terminology, meant to say, pre-combustion chamber.

The 4JB1 s direct injection so there isnt any precombustion chambers, you cant remove the sump without removing the engine first or the front diff.

It sounds to me like a big end bearing causing the piston to touch the head. I have done a few of these in my previous job.

First thing I would do is check the valve clearences if they are ok the pull the head off. check the top of the pistons for signs that has been hitting the head.

if it has then out comes the motor.

The combustion chamber is in the top of the pistons so there is very little clearance between the piston and the head.

If you do take the head off, when you go to put it back make sure you get the right thickness head gasket

rev the crap out of it.... if it goes bang it was prob a bearing
if it dosnt go bang ..... must be something else

not much help was I


blame it on my pain meds

meece4x4 wrote:rev the crap out of it.... if it goes bang it was prob a bearing
if it dosnt go bang ..... must be something else

not much help was I


blame it on my pain meds

Ahhh Im not the only one that's what i would do !!!

I had a vibration on my Hilux Ute so did the BIG rev n Dump with 33's smoked the tyres 1st 2x then blew the drive shaft cv on the 3rd PROBLEM found

it sounds like quite a metalic noise and is pretty ####### loud. Ill whip the rocker cover off on the weekend and check valves. If they are fine then i will take out front diff and check big end. Not keen on talking the engine out as i don't have an engine hoist. That would have to weight till i get back to chch in feb.
Cheers for the help guys. Feel free to offer any more ideas.

Cheers Pete

Where are you now man?

hes here in invers now.

*off topic alert*

Ya reckon we should have the 1st Southland ORE catch up one day?

Probably lol.

Couple of points to make....

1 sump on these 3.1s bends round the front diff so you can't get to the ends even if you drop it.

2 we have done three engines on these in three weeks all with the same problem - knocking. When pulled down the heads were ov but no-4 had cracked or shattered the liner and so the piston was a bit slappy!! Worst case one it was blowing by the rings and pressurising the crankcase. Recently introduced low sulfur fuel was blamed but I am not so sure.

Hope that helps..........

muddymatt