Injectors misbehaving but trying to understand the numbers

[darbuck]

Ha ha yeah pretty much. We must be all oul rockers on here

[Rhothgar]

I'm not familiar with Occam's razor.

Basically it means that the simplest explanation is usually correct. No need to go looking for complicated answers.

Correct. Although Citroens didn’t exist in 15th century.

It does still apply though.

[Rhothgar]

Ha ha yeah pretty much. We must be all oul rockers on here

Yup! Check out my War Horse blog when you can a minute and see what I’ve been up to.

[MattBLancs]

Just thinking aloud:

Normally:
Intake (down) stroke. Intake closed.
Compression stroke: air squashed, gets hot. (Up)
(Squirt of diesel into hot air)
Diesel burst into flame = bang power stroke. (Down)
Exhaust stroke. (Up)
Then back down again for next intake stroke...

If fuel was to be injected 360° out, then it ends up roughly between exhaust and intake stroke.
No compression at this point, so no bang.

Diesel remaining in the cylinder (effectively too early as it's normally just squashing air) would likely lead to pre-ignition at some point on the compression stroke - basically at whatever point in that compression stroke was hot enough to start the auto-ignition, off it'd go!

So, much waffling later, I'm not sure I buy the "injection 360° out" theory!

[darbuck]

I'll have a look Roger. I know Matt it is difficult to accept but at this stage it's the only thing I haven't tried,apart from a full compression and leak down test which I am going to do anyway. It will wither work or it won't.

I'm going to have a lot of time over the weekend.

[MattBLancs]

Good luck, I hope you have some joy with it!

[Rhothgar]

Good luck, I hope you have some joy with it!

Second that!

[darbuck]

Ok so done a proper compression test and I have approximately 350 psi on all cylinders. The reason I say approximately is because the guage doesn't have great measurements on it so the closest I can see is about 350 it could be a bit higher or lower. I think that rules out any significant compression issues. So onto timing next.the egr was leaking at both gaskets for the exhaust gases so Could theoretically have caused some pressure drops but I will fit new gaskets and pressure test it. Should be fine. If retiming doesn't work it has to be the replacement regulator I fitted or the ECU.Time will tell.

[KennyW]

Darren,

Do you have a timing kit ?

Kenny

[Rhothgar]

Ok so done a proper compression test and I have approximately 350 psi on all cylinders. The reason I say approximately is because the guage doesn't have great measurements on it so the closest I can see is about 350 it could be a bit higher or lower. I think that rules out any significant compression issues. So onto timing next.the egr was leaking at both gaskets for the exhaust gases so Could theoretically have caused some pressure drops but I will fit new gaskets and pressure test it. Should be fine. If retiming doesn't work it has to be the replacement regulator I fitted or the ECU.Time will tell.

Was the replacement fuel pressure regulator brand new?

[darbuck]

Yes genuine part

[darbuck]

Hi all I stripped the timing covers today and discovered the tensioner pointer was no where near the notch and the key way on the crank pulley was all the way to the left.
I triple checked the timing when I installed the belt.and it was central on the keyway.I think either the belt is stretched or the tensioner is no good. This has happened before with this kit. I previously thought I had made a mistake but I think now it's an issue with the kit.
Has anyone else had this issue.the cam and crank pinned ok but I had to rotate the cam about a tooth i'd say. This could explain the poor running but I don't think it's slipped enough to cause it.
I am going to pull the valve cover next to see if any of the rockers are damaged or moved. It rotated freely with the belt on so I don't think there is but at this stage I need to make sure.

[Rhothgar]

Whatever you do, check! CHECK! and TRIPLE CHECK!

You’ve got one chance to mess this up or get it right.

I don’t see how a belt could stretch. It is reinforced.

Stupid question but not because I’ve done it by accident and was VERY lucky.

Did you turn the tensioner pulley the correct way?

I did the belt on the HDI a year ago and mis-read the direction of rotation!!!!

By the time I had driven 10 miles the belt was much looser but luckily had not skipped a tooth but it very nearly cut through the timing covers as it was tracking sideways off the camshaft pulley!

Bloody LUCKY!

I cannot advise you on what to do here other than to think very carefully about which way you rotate anything that may be out.

Covers definitely need to be off so you can see valve positions otherwise it’s bendy bendy time and oblivion.

[darbuck]

Reinforced belts stretch all the time I see it on air handlers in work. I'm positive I set it correctly but you could be right with the point on the tensioner direction.The belt was tight thankfully but the tensioner was in wrong position. I have done loads of timing belts and chains over the years and never had this happen. I bought a gates kit for it and I'm discarding the skf belt and tensioner, I don't trust them.you were indeed bloody lucky on that occasion Roger surprised it held up.

[shtu]

There's no way a cambelt would stretch enough to lose a tooth's worth of timing, just doesn't happen.

There's two things it -could- be,

Is the belt the correct length? Ive had suppliers provide the wrong belt and insist it was right, despite being a different length than the original. Count the teeth on the belt. (or use the part number to reference back to the teeth on that belt, it's a minor shortcut)

Installation. I'd tend to support the theory that you may have made a mistake with the tensioner.

Top Tip - once the belt is on and tensioned, turn the engine two full revolutions in the normal direction of rotation ONLY. You should be able to reinsert the timing pins.