1948 Deere B Cam Timing

Sam from WA · Mar 27, 2009

Hey y'all
I have a 1948 John Deere B tractor in the shop right now, it had broken cam/crank gears. I have replacements and started to put it together tonight, and found that the timing marks don't all line up at the same time on the same sides (there are two marks on the cam gear, one on each side about 120~or so degrees apart, on one the crank throw side of the crank gear, and one on the flywheel side of the govenor drive gear)(inside marks for cam, outside marks for magneto/gov?), or do I line the marks up on the opposing sides of the gears and just hope I have it right?

I think any of you who have overhauled a B know what I mean?! Any help is greatly helpful and greatly appreciated. Thanks in advance.

buickanddeere · Mar 28, 2009

I would be suspect of any cam and followers that have seen 57+ years of wear. It doesn't cost very much to have a cam shop true up the lobs and followers.
The timing can be checked with a dial indicator and a degree wheel.
Intake opens at TDC, closes 50 degrees after BDC. Exhaust opens at 45 degrees bBDC and closes 5 degrees after TDC.

johndeereman · Mar 28, 2009

u r rite inside for cam and cranc timing outside for gov timing

1948 Deere B Cam Timing

Sam from WA

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buickanddeere

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johndeereman

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