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Re: Proper compression on 1950 John Deere B

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Author  [Modern View]

11-12-2012 19:33:34

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From the information you provided me I was able to confirm the pistons in my tractor are indeed "gas" pistons. I also checked the position of the throttle lever on the column (which has not been moved since the compression check) and discovered it was at about half throttle. Makes since because it was slowly backed into the shop before being torn down. I am assuming because of this my compression reading is not quite accurate. I plan on installing new piston rings and removing the valves and checking the seats. If they appear to be in spec I will just lap them with grinding compound and put them back in. I see there are several brands of piston rings to choose from. Any suggested brands I should look for or avoid?

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11-13-2012 09:19:58

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 Re: Proper compression on 1950 John Deere B in reply to CubBoy125, 11-12-2012 19:33:34  
Know anybody around with a set of used standard bore 50 pistons? They will help make up for the extra blow by when installing round rings and pistons in an egg shaped bore.

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11-12-2012 20:03:08

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 Re: Proper compression on 1950 John Deere B in reply to CubBoy125, 11-12-2012 19:33:34  
The old suction cup on a stick with lapping compound is a waste of time. The valve sealing is very briefly improved. It should not bankrupt an owner of a B to pay a machine shop to grind the valves and seats. New guides too if required.

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