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JD A ... duh, NOW what did I do wrong??

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Bob

08-05-2002 05:33:22




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Still trying to get my JD A that's been torn apart for three years back together. Put the head on, put the two studs in the head that hold the tappet assembly in place. Had a heck of a time getting the assembly to slide all the way to the head, but couldn't see anything that was getting in the way. On the backs of the two pieces that slide over the studs there are recessed circles, as if a gasket or washer should go in there, but I don't have anything of that sort in my parts box, and can't see anything in either the parts book or the I&T manual that appears to go there (both of these books show the tappet assembly in one diagram and the head/block assembly in another, and never show how the two fit together). Anyway, I put the thing together, then SLOWLY turned the flywheel to see if everthing seemed to be working correctly. I heard a "crack" and stopped. The shaft of the leftmost adjusting screw that screws into the rocker arm and rides on the push rod had snapped in two. Also, the two outer push rods were touching the top of the hole in the head through which they pass. Any idea where I went wrong? As I said in an earlier post, I took this thing apart three years ago, expecting to get it right back together, then got distracted by other things and I just don't remember a lot of the details of how things were together.

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Jack

08-05-2002 07:06:07




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 Re: JD A ... duh, NOW what did I do wrong?? in reply to Bob, 08-05-2002 05:33:22  
The pushrods can be tricky.Its kinda hard to tell if they are seated in the lifters but it sounds like you may have had one not in its seat.



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rollo

08-05-2002 06:25:26




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 Re: JD A ... duh, NOW what did I do wrong?? in reply to Bob, 08-05-2002 05:33:22  
I didn't see your earlier post, so I don't know what you did. On the surface, it seems to me like you may have a valve timing problem. Did you take the camshaft out, or change it's relationship to the crankshaft? Also, I don't know what your serial number is, but there is some kind of tappet lever spacer used in serial numbered engines up to #487999. From my parts book, it looks like it may fit in the hole you talk about.

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Bob

08-05-2002 10:09:02




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 Re: Re: JD A ... duh, NOW what did I do wrong?? in reply to rollo, 08-05-2002 06:25:26  

Didn't do anything that would change the relationship between the crank and cam shafts.
Can you tell me the part number for this spacer? I'll look it up in my parts book. Thanks.



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rollo

08-05-2002 10:13:03




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 Re: Re: Re: JD A ... duh, NOW what did I do wrong?? in reply to Bob, 08-05-2002 10:09:02  
the part number is A234R. It's called a tappet lever spacer.



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rollo

08-05-2002 10:12:49




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 Re: Re: Re: JD A ... duh, NOW what did I do wrong?? in reply to Bob, 08-05-2002 10:09:02  
the part number is A234R. It's called a tappet lever spacer.



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Bob

08-06-2002 05:13:58




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 Re: Re: Re: Re: JD A ... duh, NOW what did I do wrong?? in reply to rollo, 08-05-2002 10:12:49  
Hmmm, I had seen A234R in the parts book, but it indicates that that part number only applies to A's up to serial number 480-something. My A is 557-something, and there doesn't seem to be a corresponding part number for mine.



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