Johnno's '72 Green SE5a

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Cartrain
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Post by Cartrain » Wed Oct 14, 2020 12:15 pm

That’s irritating on what looks another stunning motor...

Is it possible you could film and post on YT, then one of our gurus will identify the sound straightaway I shouldn’t wonder.



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Johnno
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Post by Johnno » Wed Oct 14, 2020 12:29 pm

So the oil pressure seemed good - just a touch over 50 at start up and stays that way at 3000rpm.

I did capture a quick video this morning and just posted it on YT, I'll try and get a better one later tonight if the gurus here want to see any other angle. I think the sound says more than any pictures do in this case....

Hope the link works....

https://www.youtube.com/watch?v=rqbzESKbe4o


1972 Wessex Green SE5a

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Old and Slow
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Post by Old and Slow » Wed Oct 14, 2020 2:29 pm

Perhaps you need to get it over to Scotbag's Lancia specialist - would be good to create a Reliant specialist in your part of the world.
The link works for me, and it sounds like it is knocking on every revolution, not sure that this helps with a diagnosis though. I had a little end go on an A-series BMC engine but it was a bit quieter than that - mine sounded like a tappet. I think the first thing I would do is to lift the rocker covers and check for a loose rocker.
Good luck with the car - looks nice too.


Philip Needham
Ashley-bodied TR3; '54 Ford Consul; '55 AC 2-Litre Saloon;'65 850 Mini; '70 Ford Zodiac MkIV; XR3i
'81 911SC Targa, '64 Sabre Six

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Johnno
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Post by Johnno » Wed Oct 14, 2020 3:47 pm

Thanks Philip. Had not read through that thread of Scotbags, must drop him a PM to see where his guy is based.

I'll get the rocker covers off later this evening and see what I can find and let you know.


1972 Wessex Green SE5a

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Johnno
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Post by Johnno » Wed Oct 14, 2020 8:43 pm

Right so didn’t have much time this evening but got the right side rocker cover off. The arms marked with the yellow X have a lot of left to right play, the other 2 are nice and tight. Complete novice here, but I assume these should all be tight?
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1972 Wessex Green SE5a

rebel alliance
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Post by rebel alliance » Wed Oct 14, 2020 9:01 pm

Not all at the same time 😊



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Post by rebel alliance » Wed Oct 14, 2020 9:13 pm

Sounds like somethings got into a cylinder.....Are the air filter nuts /bolts and W plate screws all there



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Johnno
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Post by Johnno » Wed Oct 14, 2020 9:44 pm

:shock:
Well that’s me awake for the night sorted.

Air filter nuts and bolts all appear in place. If there’s something in the cylinder, could it have gone from being a very very faint noise to the current knocking sound?


1972 Wessex Green SE5a

Cartrain
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Post by Cartrain » Wed Oct 14, 2020 10:05 pm

Did sound strange on that short clip earlier. If you could provide more it may help. Film on idle, then rev-up. For maybe a moment at least.



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Post by rebel alliance » Wed Oct 14, 2020 10:53 pm

Yep may be a washer that was flat but now on edge or a bit of piston ring thats moved...don't think thats a big end come loose if oil pressures ok..not timing gear or fuel pump arm ..bit loud for tappets.....not much else it could be



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Johnno
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Post by Johnno » Thu Oct 15, 2020 8:09 am

Cartrain wrote:
Wed Oct 14, 2020 10:05 pm
Did sound strange on that short clip earlier. If you could provide more it may help. Film on idle, then rev-up. For maybe a moment at least.
I can - but if there is something like a washer in the cylinder, is running it a good idea?
Or should I just go ahead and start stripping? This will be a major step into the unknown for me...


1972 Wessex Green SE5a

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Post by rebel alliance » Thu Oct 15, 2020 9:08 am

Valve seat insert worked loose ?



Cartrain
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Post by Cartrain » Thu Oct 15, 2020 9:17 am

I’m sorry but there wasn’t much to go on. The damage will be already there whether you run it for a moment or not. It might be just enough for someone to identify it.
Do the tappets then try again. At least you eliminate more sounds.

Have you changed the oil ? See what’s in there.

Whatever, it’s something that can be sorted.



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Old and Slow
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Post by Old and Slow » Thu Oct 15, 2020 9:21 am

Check with the PO (previous owner) to see if it has had a conversion to unleaded - that involves fitting hardened valve seats - which is what Rebel Alliance is suggesting.
If the oil pressure had been low I'd suggest a big end too, but that seems unlikely.
My earlier suggestion of a rocker arm problem is probably a red herring.
Like you, I'd be reluctant to run the engine - if you have a camera borescope (cheap on t'internet for USB attachment to a laptop) you could have a look down the plug holes to check for debris and pock marks in the piston crowns.
Fingers crossed you get it fixed OK.


Philip Needham
Ashley-bodied TR3; '54 Ford Consul; '55 AC 2-Litre Saloon;'65 850 Mini; '70 Ford Zodiac MkIV; XR3i
'81 911SC Targa, '64 Sabre Six

Terry H
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Post by Terry H » Thu Oct 15, 2020 9:22 am

If it's a nut or washer in the cylinder and it's not to big you could use one of these https://www.ebay.co.uk/itm/UK-Pro-Long- ... 3173797680? down the plug hole and maybe get it out. Also, an endoscope would be a good idea as well. both items very cheap to buy.
Regards Terry H



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