Engine rattle on load / acceleration -Mostly solved!

I would be having a look at the gearbox & t-box/props maybe. I think you still have the standard R72 gearbox in (known problem child)?

I had problems with the gearbox making odd noises in certain gears, which was bearings on one of the shafts. It was obvious it was the gearbox as it was certain gears, but strangely the noise came from further forward in the cabin than i expected it to.

If the noise is on-load after warming up then the transfer box or props are more likely perhaps? What does pressing the clutch pedal do when its making the noise?

facade wrote: The vvt is controlled by the solenoid valve located horizontally at the top front of the engine, below the water elbow pipe.
There are 2 oilways in the sprocket end of the inlet cam, fed from this valve.
The cam sprocket is loose and attached to a 3 chambered cylinder , and there is a 3 spoked impeller on the end of the cam that is inside this cylinder.
With no oil pressure the sprocket rotates until the impeller blades contact the chamber walls, and the cam then rotates retarded so the engine starts.
When there is oil pressure, the ecu requests a specific timing advance or retard, and moves the solenoid valve one way or the other, to allow more oil to get between the impeller blade and the chamber wall on one side, forcing the cam to move relative to the sprocket.
The solenoid is operated at a high frequency, and the impeller blades end up locked solid with oil on each side of the chamber (or the cam would shoot forwards as the lobe goes over the tappet)


This is the general idea, this is actually a Delphi system, but I believe the jimny is the same

I can't see that rattling tbh, unless there is a massive oil leak at the front of the cam, and I'm fairly sure the erratic cam timing would put the EML on.

Renault use a dreadful thing called a dephaser pulley, full of springs, that does a similar job, except it breaks straight away, and rattles like a diesel engine.

Thanks Facade! Great explanation. Eill flip over cam position sensor from other engine just to try something. Taking the car to work tomorrow to get second opinions on the noise.


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Riccy wrote: I would be having a look at the gearbox & t-box/props maybe. I think you still have the standard R72 gearbox in (known problem child)?

I had problems with the gearbox making odd noises in certain gears, which was bearings on one of the shafts. It was obvious it was the gearbox as it was certain gears, but strangely the noise came from further forward in the cabin than i expected it to.

If the noise is on-load after warming up then the transfer box or props are more likely perhaps? What does pressing the clutch pedal do when its making the noise?

Thanks riccy.
Yes I got that gearbox. It is leaking in the rear and got a slight whining noise already so I know.. Needs new prop shaft seal. But i do not think this noise is from gears or bearings. The chain inside transfer box though could rattle like this i guess.
I have actually greased my prop shafts. Pressed grease in until they expanded. No play in the joints 3000km ago.

Clutch springs broken some said. Loose flywheel? I did use loctite on the bolts... When pressing clutch, load goes, no sound. Nothing when revving.
Releasing throttle pedal, and stepping hard down makes alot of rattle but just for 2 seconds.
Hoping second opinions from colleagues tomorrow will help as well.

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Maybe it is the shifter seals?
And definitely the transfer fwd seal..

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Oil came out of gearbox and transfer level plugs, so oil inside is ok despite the leaks..

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Ringing/rattling sound appeard today from exhaust side of engine. Listening thru a wooden stick and the manifold catalytic lump is the only place on the engine I can hear it thru the stick. So have to decide whether to ignore it for now, or dismantle and cut it open..

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