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John Deere Tractors Discussion Forum
Show Parts for Model:

Re: 2630 flywheel timing bolt hole, with broken pin?

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chickenfriend

01-16-2013 07:24:10
76.4.85.97



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Yes. I was thinking the same thing, knowing what I do now.

Perhaps they had a good reason not to make that hole no deeper than necessary; and with a little bit of play with the pin in the flywheel housing, it was more likely that the pin would be pushed out if accidentally left in.

It just didn't seem to me that 1mm was much of an insertion depth into the straight hole, and I had a local John Deere mechanic tell me the depth was about 3/8", he thought.

I don't have the original pin, but if the end is rounded ( I think it was) or tapered, it is possible it also fits the chamfer region, too, and in that case, the pin could have a 3/8" diameter, indicating I was thinking the wrong way about it.

If I need a substitute pin, I use a section of brass or cheap steel, and not something like grade 8.
This post was edited by chickenfriend at 07:43:51 01/16/13 9 times.

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Tim S

01-16-2013 07:35:08
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 Re: 2630 flywheel timing bolt hole, with broken pin? in reply to chickenfriend, 01-16-2013 07:24:10  
The original pin was soft, the big thing is not to forget and crank the engine with it in...it's a locator, not a lock. I've god a 2030 out side waiting to come in..I'll look at it closer when I split it..



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chickenfriend

01-16-2013 08:05:02
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 Re: 2630 flywheel timing bolt hole, with broken pin? in reply to Tim S, 01-16-2013 07:35:08  

Tim S said: (quoted from post at 08:35:08 01/16/13) The original pin was soft, the big thing is not to forget and crank the engine with it in...it's a locator, not a lock. I've god a 2030 out side waiting to come in..I'll look at it closer when I split it..


Thanks.

There is just a little more to this story; I may be purging an anxiety I have had for many years.

Not only had I assumed the pin was broken off in the flywheel, I also assumed I had broken off a section of the flywheel.

In fact, every couple of years, I would call the dealer to find out how much a new flywheel was. Last check was $1000, up from 500$ a few years before.

What I saw though the timing plate access hole was a cavity or hole in the flywheel right next to the ring gear. The corners of the cavity are jagged and beveled, and to my untrained eye, looked like something broken-off.

Now that I have a better view, through the starter hole, I see these cavities are part of the flywheel design. I think there are 4 cavities on the edge of the flywheel, each 90 degrees apart.

The edges of the cavities are a little jagged and not a neat machined look. I would bet that the sharp edges were purposely beveled in some fashion, to reduce the chance of stress risers at those points.
This post was edited by chickenfriend at 08:13:40 01/16/13 8 times.

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