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Antique Gas Engine Discussion

Nelson Brothers timming


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  #1  
Old 02-27-2005, 08:13:15 PM
Mark K Mark K is offline
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Default Nelson Brothers timming

I have a Nelson little Jumbo 1 1/2 hp type "P". How do you time the crank gear to the cam. I cant find any punch or other timming marks. The engine was apart when I got it. It will soon be ready to run. Are there any reprint manuals for these? Thanks
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Old 02-27-2005, 08:27:17 PM
Alan R Alan R is offline
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Default Re: Nelson Brothers timming

Mark, I had the same problem til Hank C came through for me. If he doesn't post here in a short time I'll give it a shot. But it would be better for all if he does it.
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Old 02-27-2005, 08:43:23 PM
Chip Watford Chip Watford is offline
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Default Re: Nelson Brothers timming

Mark,One way that I have used is as follows.Turn the flywheels so that the crank throw is pointing straight up.Then install the cam gear so that the lobe on the cam is also pointing straight up.This should get you within 1 or 2 teeth of being correct.The mag should trip just before TDC.The exhaust valve should begin to open just before BDC on the power stroke and close at TDC on the exhaust stroke. Chip
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Old 02-27-2005, 11:43:21 PM
Hank Czerwick Hank Czerwick is offline
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Default Re: Nelson Brothers timming

Here's the pdf on engine timing! Has worked for everyone who's used it so far, let me know how it goes!
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File Type: pdf Timing.pdf (40.9 KB, 277 views)
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Old 02-28-2005, 02:24:23 PM
midpw midpw is offline
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Thumbs up Re: Nelson Brothers timming

Hey Thanks !!!

I've never seen it explained quite that way before.

Timing one of these things has been a mystery to me so I am sure am glad to have this in my files.
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Old 03-01-2005, 08:46:17 PM
Mark K Mark K is offline
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Default Re: Nelson Brothers timming

Thanks Hank, Your method is great for finding the high spot on the cam, however on step 6 should the valve not begin to open at BDC and close on TDC ?
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