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Noisy engine |
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ranton_rambler 
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Joined: 13 Feb 2015 Location: Stafford Status: Offline Points: 1232 |
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 Posted: 24 Aug 2025 at 16:59 |
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I rotated the engine to bring each bolt into reach. It was very fiddly to get the bolts out and caps off, and probably more so to put it all back together again. But as I said, no need to take front cover off.
I think I took the oil pipe off, but that’s easy enough.
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el__burro
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Joined: 04 Aug 2018 Location: London UK Status: Offline Points: 499 |
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Posted: 25 Aug 2025 at 12:34 |
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Managed to take out the left (easy one) rod.
The shellings are in a very sad state. The shaft itself seems fine to me. Now I need to use the plastigage.. and that will be fun. Any tips, suggestions Thanks el__ burro    |
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el__burro
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Simond
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Joined: 23 May 2021 Location: Kent Status: Offline Points: 1021 |
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Posted: 25 Aug 2025 at 13:34 |
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My LeMans did something very similar.
Horrible pitting of the whitemetal, clunking noise, but the oil light went out as it should. Happily the crank was unscored, and I just rebuilt with standard shells. I also replaced to cam followers, which were also pitted. Reminder to self, change the oil more frequently. Good luck Simon
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Amboman
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Joined: 05 Dec 2015 Location: Maryland, USA Status: Offline Points: 426 |
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Posted: 25 Aug 2025 at 14:18 |
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The sludge trap inside the rod journal is likely full enough that it's restricting oil flow to the rod bearings.
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Charlie
'69 Ambassador,'71 Ambassador,'73 Eldorado,'75 Eldorado police,'76 Convert,'77 Morini 3 1/2 Strada,'81 Ducati 500SL Pantah http://www.AntietamClassicCycle.com |
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el__burro
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Joined: 04 Aug 2018 Location: London UK Status: Offline Points: 499 |
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Posted: 25 Aug 2025 at 18:36 |
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The other set of shells are even worse.
I have attempted to use flexigauge to establish what shell size I need to buy but seeing the results, I guess I'm doing it wrong. I know that I should not turn the crankshaft while tightening the bolts but the bloody strainer holder is on the way and I have the results below. All shells are marked with 674 23 000. Thanks el__burro     |
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el__burro
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Mike H
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Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 9053 |
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Posted: 25 Aug 2025 at 19:55 |
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I am reminded of a member some years ago had a Le Mans - out on a 'bimble' one day, overtook a couple of cars, to be rewarded with a knocking noise. Sludge trap bunged up, big ends only just getting enough lube provided throttle is used only gently. |
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"Chicken nuggets don't dance on a Tuesday."
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el__burro
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Posted: 25 Aug 2025 at 23:43 |
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Sorry.. where/what is the sludge trap? Thanks el__burro
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el__burro
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Gianni
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Posted: 26 Aug 2025 at 08:11 |
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On later engines (those with oil filters and alternators), it is at the front of the crankshaft. You will have to remove the crank (i.e. full engine out job) to get at it. The trap is sealed with a large flush-fitting hex screw which may or may not come out easily. Once out you will find the residual detritus from your big end shells and a thick porridge of 70-year old oil gunk. This must all be thoroughly cleaned out. Whilst you are at it, you should check your main bearing surfaces and the rear cam bearing. I would not be surprised if your cam followers and the cam were not a little worn too.
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Le Mans 1, Spada, Cali 1, T3 Mongrel, Le Mans V, Quota x 2, Stelvio TT
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c13pep
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Posted: 26 Aug 2025 at 10:21 |
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You’ve now reached decision time ie. is this your winter project or do you loosely reassemble it and recover it to a professional workshop. Looking at the damage I would agree that a full engine refurb will be the most likely outcome for peace of mind.
CHRIS
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you can`t have any fun in a straight line
Honda CB77 project |
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Mike H
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Posted: 26 Aug 2025 at 13:00 |
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 I.e. there are no short-cuts, sadly.  |
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"Chicken nuggets don't dance on a Tuesday."
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Mike H
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Posted: 26 Aug 2025 at 13:02 |
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+ Memory is suggesting it's a tapered thread, but memory is unreliable unfortunately. |
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"Chicken nuggets don't dance on a Tuesday."
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Mike H
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Posted: 26 Aug 2025 at 13:10 |
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"Chicken nuggets don't dance on a Tuesday."
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el__burro
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Posted: 26 Aug 2025 at 16:28 |
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OMG, since I need to do the clutch, I guess engine removal is a good way to go..
Too complicated to do anything with engine on. Let's see. el__burro
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el__burro
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Simond
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Posted: 26 Aug 2025 at 19:32 |
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As I noted above, my shells were similar to el_burro’s.
I checked my sludge trap, and a) it wasn’t particularly full of gunk, and b) it wasn’t particularly difficult to unscrew the grubscrew that closes it off. I’ve heard stories of punched threads and Loctite and all sorts, but mine was just tightened. A drop of soft threadlock did make sure it wasn’t coming out again though! With no strong evidence to support my hypothesis, I’m thinking it has more to do with low usage, and consequently infrequent oil changes.
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el__burro
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Posted: 27 Aug 2025 at 13:17 |
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Good afternoon,
the numbers on the back of the shells are 67420 000.
Probably the "000" means standard size. Any idea? el__burro   |
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el__burro
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Amboman wrote: