Lancia Motor Club Forum Banner
10 December, 2023, 10:56:52 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Need to contact the Forum Administrator? e-mail forum.admin@lanciamc.co.uk, for Database Administrator e-mail database.admin@lanciamc.co.uk      -      Copy deadline for Viva Lancia is 12th of each month.      -      For Events e-mail events@lanciamc.co.uk      -      To Join the club go to http://www.lanciamc.co.uk/join.htm
 
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
  Print  
Author Topic: Big ends  (Read 874 times)
0 Members and 1 Guest are viewing this topic.
Spider2
Senior Member
*****
Posts: 107


« on: 04 October, 2023, 06:57:26 PM »

Investigating a rumble when hot and under load. Wrestled the sump off. # 1 big end bearing shells were in 3 bits not two! And minus the tangs. I will try and post a picture.
Logged
Spider2
Senior Member
*****
Posts: 107


« Reply #1 on: 04 October, 2023, 06:59:42 PM »

Ho do I post a picture?


* big end shells.JPG (1817.37 KB, 4032x3024 - viewed 33 times.)
Logged
LCR1967
Member
**
Posts: 20


« Reply #2 on: 05 October, 2023, 07:04:57 AM »

What is the condition of the crankshaft. The journal bearing appear to be heat stained, indicating insufficient lubrication pressure through the crankshaft main journal. Is the crankshaft journal ports free on debris?
Logged
Spider2
Senior Member
*****
Posts: 107


« Reply #3 on: 05 October, 2023, 09:39:06 AM »

Hi,
Yes I agree with you it looks like a lack of lubrication. I am going to do several plasti gauge checks with good shells in and check #1 main bearing. It that is good then I guess the passage way is blocked to # 1 big end. What is a good way of cleaning out this passage way, bearing in mind the engine is in situ
Logged
Spider2
Senior Member
*****
Posts: 107


« Reply #4 on: 05 October, 2023, 09:42:08 AM »

And surprisingly I can feel no ridges on the journal when I run my thumb nail across it.
Logged
LCR1967
Member
**
Posts: 20


« Reply #5 on: 09 October, 2023, 01:50:33 PM »

Hi,
Yes I agree with you it looks like a lack of lubrication. I am going to do several plasti gauge checks with good shells in and check #1 main bearing. It that is good then I guess the passage way is blocked to # 1 big end. What is a good way of cleaning out this passage way, bearing in mind the engine is in situ

There are several bungs in the counterweight that are removed and flushed to ensure all internal passages to the feeder holes are clear from debris, oil build up or any sludge. I cannot think of a good way of thoroughly cleaning the passages with the crank still in situ. The only option would be to use a suitably sized pipe cleaner to clean each of the journals passages that feed the ends.
Logged
lancianut666
Permanent resident
**
Posts: 1568


Slow but rough


« Reply #6 on: 12 October, 2023, 06:47:34 AM »

Take the engine out, surely the crank needs a complete clean out and all the bearings need replacement. With an engine crane it is an afternoon of spannerwork.
Clarkey
Logged

Fulvia Coupe S2 Flavia Coupe 1967 1.8 Kugelfischer Prisma 1.6 carb Y10 Fila Y10 Touring Dedra 1.8 Dedra 2.0 Turbo Appia S1
davidwheeler
Permanent resident
**
Posts: 1451



« Reply #7 on: 16 October, 2023, 06:49:13 PM »

I have always found it easier to lift the car off the engine/subframe but chaqun a son gout.
Logged

David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
Spider2
Senior Member
*****
Posts: 107


« Reply #8 on: 17 October, 2023, 11:10:44 AM »

Firstly, thanks to everyone for their sound advice and support. However, a lot of you are not going to be happy with what I have done.
I have replaced #1 big end shell and I am going to re-inspect after 250 miles. If it shows any signs of distress I will do a bottom end overhaul. I have to say that the engine now sounds so much sweeter. It idles smoother with no bottom end rattle on start up. The advantage of this scheme is that I need the car driveable as it it goes away for a small amount of bodywork next week. It also gives me time to contemplate and plan a possible bottom end overhaul in the spring. By the way, the plastigauge reading was 1.5 thou. Not bad!
To that end, for little money, I have bought a core engine. This autumn/winter I will disassemble it and assess whether or not it is overhaulable. Either way I will have fun doing it and it will give me the confidence in doing the possible bottom end on my engine. As a retiree I have plenty of time on my hands so I can be slow and methodical.
To tap on the wealth of knowledge here, I am starting a new thread called "my engine overhaul". I beg your forgiveness in advance for the numerous and obviously stupid questions I will be asking.

Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Contact the Forum Administrator

LMC Forum copyright © 2007 - 2021 Lancia Motor Club Ltd

Powered by SMF 1.1.20 | SMF © 2006-2011, Simple Machines
Page created in 0.041 seconds with 20 queries.