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JDA connection rod clearence

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Menno

12-23-2002 23:38:58




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I have JDA 1945.
I want to adjust the connectionrod clearence to the crankshaft. My book tell's it has to be 0.003". But what is the max and min clearence?

Thank you all for the help in 2002, hopefully we go on in 2003.
I wish you all a merry Chrismas and a healthy 2003.


Menno from Holland

PS I can send you a Zwarte Piet if you wish.




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Steve - IN

12-24-2002 09:19:42




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 Re: JDA connection rod clearence in reply to Menno, 12-23-2002 23:38:58  
Menno,

No thanks - no Zwarte Piet needed here. You could send over some Jonge jenever if you get a chance.

My 60 manual lists .001 to .004 as rod bearing clearance specs. I'd guess the A would be fairly close. The important thing to remember (in addition to new round rod journals versus old egg shaped journals) is that tighter specs mean a little less power but longer engine life, and loose clearances mean a little more power, but less engine life.

Merry Christmas,

Steve

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menno

12-24-2002 11:01:51




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 Re: Re: JDA connection rod clearence in reply to Steve - IN, 12-24-2002 09:19:42  
How did you learn that Dutch language?

I'm living in Friesland (in Holand) and we have our own langauge here, bu maybe you know that.

Groeten uit Holland
Groetnes ut Frieslan

Menno



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Steve - IN

12-24-2002 11:53:30




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 Re: Re: Re: JDA connection rod clearence in reply to menno, 12-24-2002 11:01:51  
Menno,

If you know English and some German - it seems fairly easy to understand some Nederlands. Frisian sounds closer to English to me than Dutch. It's similar to the way it's easier for an American to understand the Duits or Germaans tongue in Schleswig Holstein than it is the Hoch Deutsch or especially the Platt Deutsch my cousins speak down in Swabia.

A lot of years ago, I spent some time with a friend named den Hartog in Nijmegen. He wasn't really a Duke, but I did learn some Dutch. A few years ago, I had a chance to lay over a few days at the "ship hole" airport, so I got to revisit Nijmegen, Arnhem, Eindhoven, and Amsterdam just briefly. Didn't make it up north to around the the Zuider Zee that time, but really do enjoy your country.

Dank U en Vaarwel en Gelukkig Kerstfeest!

Steve

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ChuckW

12-24-2002 05:10:52




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 Re: JDA connection rod clearence in reply to Menno, 12-23-2002 23:38:58  
the reason the book refers to .003 is this is width of the shims. If you take equal shims, one at a time and retighten till the rod locks to the shaft, then put shims back one on each side(they are .003) till it turns your clearance will be correct. Nauturally the crank may be egged shaped some but there is nothing you do do about this short of machine work. What this means is a one point on the crank you may have 5-6 thousands clearance. There's nothing you can do about this. Don't mess with plasti gauge and do you clearance before you put new rings in as you will have trouble rotating your crankshaft. Good luck.

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Clooney

12-24-2002 05:08:58




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 Re: JDA connection rod clearence in reply to Menno, 12-23-2002 23:38:58  
Menno, is the crankshaft you are using freshly machined with perfectly round journals, or is it a used crankshaft with out-of-round [egg shaped] journals? That makes a big difference on the bearing clearance. The bearing clearance MUST be set at the tight spot & that usually allows the clearance to be larger at the loose spot. The bearing type also makes a difference with the Babbitt type being able to get set a little tighter.

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