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eeyoreish

Oil Pressure Oddness

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On 06/02/2019 at 10:27, Clive59 said:

John, if you go into the Play Store app on your phone, you can get it there. If you haven't used Play Store before, do so. It has all sorts of good stuff(and lots of crap of course). If you just search the apps on your phone you will find it.

Got it Clive, thanks. Looks like a handy bit of info.

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2 hours ago, eeyoreish said:

What frequency is recommended for the round toothed belt on the HC?

This might help, there is a copy on this forum somewhere, but in summary, seems 100-110Hz is about right.

 

9XX Timing Belt Tension - Manual Notes - JH to Turbo.docx

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OK, so using the Gates app this morning I consistently measured 92-93Hz over a few attempts.

Thats on the inlet to aux pulley section of belt, with engine at 30 deg before TDC, engine hasn't run for a week, temperature in the garage is about 10deg C.

As I understand it with the ambient temp lower that the 'ideal' 15-25 C I should expect a slightly looser belt/lower reading, which is what I have. I think I conclude therefore that the belt tension is OK and certainly not too tight. Do you expert folk concur?


Not worth starting anything now...🍺

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Just ran the engine up again now. Maybe it’s me but the noise, whilst still there, doesn’t seem quite so prominent today. Spraying a little WD40 on the belt doesn’t seem to alter it.

Closer analysis of the spinning inlet pulley shows that the outer rim is running true with no flats or buckle. The inside rim is though running slightly out of round, as is the hub of the pulley where it’s attached to the cam (even though the end of the cam is running true). I don’t know if that’s common? i.e the inner part of the pulley isn’t necessarily machined perfectly round? Hard to see how the inner part could be buckled without it affecting the outer rim. Concerned I could be focusing on something that’s been there all along...

Im going to balance up the carbs so it’s running more smoothly. Big question is do I drive the car like this or continue trying to investigate this noise?? And where would I look next?

 


Not worth starting anything now...🍺

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I’d not have sprayed WD40 on the belt - but now you have - give the bearings a quick blast with the stuff


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Only sprayed a touch on the advice of a mechanic friend to see if it altered the noise at all. It didn’t.

Which bearings should I be lubricating? The tensioner is new, as are the alternator bearings.

The good news is that having not run for a week I got oil pressure showing on the gauge within 5 or 6 seconds of starting so it looks like the original problem is solved at least.


Not worth starting anything now...🍺

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I’d be suspicious of any new bearings - the noise wasn’t there before I’m assuming- and it is now. A dry bearing will whine give them a light whack with the wd 


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The tensioner bearing is sealed; spray lubricant shouldn't help, but if it does (and it would only be temporary - seconds), you have a problem.


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Yep - and noisy tensioner bearings are a well known thing sadly 


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The problem is that I did have a whine, but the old tensioner bearing was well knackered so it was probably that. What I don't know is whether the current whine is the same one and/or existed before, possibly masked by the tensioner noise.

I pressed on the new tensioner myself and it felt fine when I put it on.

Why is nothing straightforward..?


Not worth starting anything now...🍺

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On the positive side - you have good oil pressure 

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Brilliant result - tick in the box


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I'm a bad person. I did 'borrow' a couple of bits off the nice TE engine under the bench. I did leave an IOU note though so I think it's OK.

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Not worth starting anything now...🍺

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Not “THAT” TE engine. You will go to hell my friend 

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