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PostPosted: Sun Feb 11, 2018 5:47 pm 
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Hello everyone, hoping somebody may be able to help with this...

I've recently inherited my Dad's Pembleton and have found that the engine makes an irregular knocking noise, especially when at idle. Without seeing the car Sam McIntyre has already suggested that this could be due to end float on the camshaft or a worn cam follower. I've taken a short bit of video in the hope that it may be instantly obvious to someone what the problem is. Any help appreciated, thank you!

https://youtu.be/Fx8fyp6X2Ow


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PostPosted: Sun Feb 11, 2018 6:23 pm 
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Location: Durham, NE England
Hi John,
Just listened to the recording, Guzzi big blocks can be clattery beasts, but that is excessive! It sounds to me like an individual valve issue on tick-over, so it could be a loose valve guide, especially if the noise is more pronounced on one side. It might be worth taking off the rocker covers, remove and earth the plugs( to protect the electronic ignition), and spin the engine over on the starter?
Sam


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PostPosted: Sun Feb 11, 2018 7:28 pm 
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Location: Leeds, West Yorks/Limerick, Ireland
You might read the tick tick mystery in ePAG 34 for another possible answer!

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PostPosted: Sun Feb 11, 2018 8:25 pm 
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Joined: Mon Apr 01, 2013 9:40 pm
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Location: Malvern
Hi John,
As the sound is sporadic I would suggest a blown head gasket, if the engine has been rebuilt it should have the heads re-torqued after a few hundred miles?
IMHO if it was valve gear it would be more of a tappet sound and in tune with the revs.

Cheers,
Rob


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PostPosted: Mon Feb 12, 2018 3:14 pm 
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Location: North Norfolk
John,
FWIW I think Sam is probably right. The valve guides on the big block are held in place with a circlip. If one guide has become "free" it will chatter, more so on slow tickover, but it is harder than the head casting and will likely wear the guide housing. Top end overhaul, I fear - the sooner the better.

(PS I think it's unlikely to be an unadjustable clock pendulum shaft the "ticking" cause described by Ian in Epag 34!)

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It's a 2CV Jim, but not as we know it.


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PostPosted: Mon Feb 12, 2018 7:16 pm 
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Thank you all for your replies. As soon as I get some free time I will have a tinker and let you know how I get on!


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PostPosted: Mon Feb 12, 2018 7:52 pm 
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Joined: Sun Feb 24, 2013 6:56 pm
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Out of couriosty are the carb bell mouths with out mesh the clank with the engine struggling to run makes me wonder if something keeps getting between valve/ head /seat ,
Could be wrong and have been before :D


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PostPosted: Fri Apr 27, 2018 7:35 am 
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Location: Durham, NE England
Hi John, did you find a solution to this? If not, another source of the noise could be worn rocker spindles. They tend to wear the steel shaft rather than the softer phosphor bronze bush. To check, get the cam on the base circle as if you were checking valve clearances, push down on the pushrod end of the rocker to take up the clearance, and lift the adjuster end of the rocker arm up and down to feel for movement on the shaft.


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PostPosted: Thu Aug 16, 2018 6:11 pm 
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Joined: Sat Feb 10, 2018 7:41 pm
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Hi all, hope you’re having a good summer. Apologies for not responding sooner, I’ve had a busy few months.

Shortly after Dad shuffled off this mortal coil last December, Mum followed suit in February. I have sorted most of their affairs now, apart from the house which I’m still steadily clearing. Alongside this and my job, I’m studying in my spare time to become a building surveyor which has kept me very busy. Additionally, a couple of months ago my other half announced she is pregnant, so altogether an eventful year so far!

Consequently, I’m sorry to say the Pembleton hasn’t see the light of day yet. I’d like to solve the issue myself, but having neither the time nor the skills to start taking the engine apart, I called a couple of local Italian bike specialists for help. Neither were interested in working on a three wheeler due to lack of space, so I’m feeling a bit stymied. The next step is probably to find a mobile mechanic willing to diagnose the fault. Any recommendations in the Hampshire area?? I’d appreciate your advice, thanks.


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