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Problems won't go away. What else could there be?

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Old Sep 16th, 2021, 22:01   #121
Tony Rama
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There has got to be some mechanical damage to this engine.

It was reported that it ran fine after the cam belt failure, but some cam followers or other components may have been cracked or over stressed by piston to valve contact and failed some time later.

All this will only be known by removing the rocker cover, and maybe the head, and carefully examining the components. There must be plenty of second hand heads available.

The question is, is the car worth it? Otherwise break it or sell it as a non runner and cut ones losses.
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Old Sep 18th, 2021, 00:40   #122
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Are you going to check the timing belt alignment and the cam followers and valves? At least this will confirm the functionality of the mechanical parts. Take a look at the video I posted a link to. It shows what happens when a cam belt breaks. Your engine is highly unlikely to have escaped any damage at all.
I have no reason to suspect there have been any mechanical damages from the timing belt snap. The replacement was done by a Volvo mechanic who's done it for several decades, checked to make sure it was alright, ran smooth with no weird noises after the timing belt replacement and taken to the Volvo dealership themselves who checked twice that it's done properly and given the all clear.
Sure, I can have a look if nothing's damaged visually but I would likely mess up something if I played with the timing mechanics myself, that's why I don't dabble with it and let the specialist do what they're qualified to do.

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If they are all functioning correctly then the next thing to look at is the pulse signal to the injectors. It would need someone with an oscilloscope to check for an intermittent signal. Next check the position sensor and wiring for the injector timing.
An oscilloscope might be a bit above my understanding let alone having one. I've got noid lights and a multimeter but that's about it. Remember a guy a while ago telling me how to test injector signal readings with an oscilloscope but I'm afraid I might need a bachelor's degree to understand and follow what he was explaining to me.
If I can't test it with the 2 items I have, that will be a dead end for me. Might have to sell it... any offers?
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Old Sep 18th, 2021, 01:08   #123
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I have no reason to suspect there have been any mechanical damages from the timing belt snap. The replacement was done by a Volvo mechanic who's done it for several decades, checked to make sure it was alright, ran smooth with no weird noises after the timing belt replacement and taken to the Volvo dealership themselves who checked twice that it's done properly and given the all clear.
Sure, I can have a look if nothing's damaged visually but I would likely mess up something if I played with the timing mechanics myself, that's why I don't dabble with it and let the specialist do what they're qualified to do.



An oscilloscope might be a bit above my understanding let alone having one. I've got noid lights and a multimeter but that's about it. Remember a guy a while ago telling me how to test injector signal readings with an oscilloscope but I'm afraid I might need a bachelor's degree to understand and follow what he was explaining to me.
If I can't test it with the 2 items I have, that will be a dead end for me. Might have to sell it... any offers?
If you've tested every injector with the NOID lights and they all show as working, you've already got a visual go/no-go on whether they're working or not, assuming the injectors actually function, something else i believe you've already checked.

Without being rude but picking up on your self-confessed limited technical ability, how competent are you at removing the rocker/valve cover?

If you're ok with that, i'm fairly sure you can identify the valves and their springs and observe their movement as you turn the engine over by hand using a socket and ratchet drive on the crank pulley bolt, obviously in the normal direction of rotation. The firing order i believe is 1-2-4-5-3 with #1 on the right hand end, usually timing belt/crank pulley end. However you know where #4 is as that's the one giving trouble if memory serves so please excuse the teaching to suck eggs! That said, turning it over by hand you should see all the inlet vales open in the same order as the firing order and ~1.5 turns later the exhaust vales should open in the same sequence as the inlets. In other words, as you turn it over, if #1 inlet valve opens, about 1.5 turns from when it starts opening #1 exhaust valve will start to open but the other valves will all be doing what they should at various times throughout the turning over of the engine.

What you're actually looking for is that all inlet valves open a similar amount and that all exhaust valves open a similar amount. If any (probably on #4) aren't opening as they should, look for a problem in the corresponding valve train between the camshaft and that valve. Could be a broken rocker, a dished follower or even a bent valve or broken valve spring - the last one won't allow full compression so power will be down as a result.

If that reveals nothing then i suspect it will be a top end stripdown to ascertain the cause of #4 not firing as it should.

Either that or as you suggest, sell it and cut your losses, someone may amke a good offer and have the bits to fix it cheaply enough to make it worth their while and gives you the opportunity to find one that does run as it should.
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Old Sep 20th, 2021, 10:47   #124
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Surely a simple compression test would flag up a problem with valves?
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Old Sep 20th, 2021, 11:07   #125
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Surely a simple compression test would flag up a problem with valves?
It would but being a diesel will need a hefty compression tester and the injectors removed to facilitate the test. The OP sounds as if that might be a bridge too far for him now although i might be wrong.
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Old Sep 20th, 2021, 12:27   #126
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If some rockers are bent or broken, the valves will just not open as far, or not at all. The compression would be fine since the valves would close perfectly.
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Old Sep 20th, 2021, 12:55   #127
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If some rockers are bent or broken, the valves will just not open as far, or not at all. The compression would be fine since the valves would close perfectly.
The compression would be down as the cylinders wouldn't get their fill of air, even loose valve clearances can make a big difference!
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Old Sep 20th, 2021, 13:33   #128
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The compression would be down as the cylinders wouldn't get their fill of air, even loose valve clearances can make a big difference!
That's true! Hadn't considered that.
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Old Sep 20th, 2021, 20:34   #129
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Old Oct 1st, 2021, 22:41   #130
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Default Timing belt didn't snap, was the alternator belt

Still trying to fully map out all the events that happened so I know where to start, looking back however I'm told that the timing belt didn't snap and I'm wrong.

On the Humber Bridge, instead of the timing belt snapping the alternator belt did and in the process got caught up in and jammed up the timing belt. Having the car towed to my mechanic, the alternator belt was to be replaced and mechanic said the timing belt change was due, so might as well do both at the same time. Hope I got the events and order right this time.

Good news then on possible damage. If timing belt didn't snap as I've been corrected, can't see a way there can be damage.
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