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1977 400F2 first restore project
Bryanj:
When you say waggle do you mean rock at the small end or there is side play at the big as in slide sideways ?
smoothoperator:
There are 2 components. 1 is side to side which is the movement as the rod slides along the crank in the limited space it has to do so, this is probably the biggest element which I see as "normal", the other is a rocking movement which I interpret as a clearance between the shells and the journal.
As a test I removed the conrod, re-tightened the 2 bolts, then slid it on to the main journals at either end of the crank, the amount of "waggle" felt about the same. I expected it to feel tight I suppose but it slid on easily. I am assuming that the main journals are the same nominal diameter as the big end journals.
Bryanj:
Cant remember but Honda manual will tell you.
Can you post a pic of the bearing surface of shells? And i would still check clearance with plastigauge
4wDaz:
--- Quote from: smoothoperator on August 07, 2021, 09:46:14 PM --- I am assuming that the main journals are the same nominal diameter as the big end journals.
--- End quote ---
Mine were
McCabe-Thiele (Ted):
--- Quote from: smoothoperator on August 07, 2021, 09:46:14 PM ---There are 2 components. 1 is side to side which is the movement as the rod slides along the crank in the limited space it has to do so, this is probably the biggest element which I see as "normal", the other is a rocking movement which I interpret as a clearance between the shells and the journal.
As a test I removed the conrod, re-tightened the 2 bolts, then slid it on to the main journals at either end of the crank, the amount of "waggle" felt about the same. I expected it to feel tight I suppose but it slid on easily. I am assuming that the main journals are the same nominal diameter as the big end journals.
--- End quote ---
Have you checked it with Plastigauge are the conrod halves bolted together the right way round?
Not sure checking it against the end mains will give you any answers.
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