Re: Lead additive to Gasoline Tractors

Posted by RN on April 18, 2016 at 09:32:43 from (205.213.104.125):

In Reply to: Lead additive to Gasoline Tractors posted by pwyld on April 18, 2016 at 06:37:53:

Wallaces Farmer and/or Hoards Dairyman had some research done on possible problems with unleaded fuels in older tractors, valve seat erosion was one concern. Engine speed was one consideration for possible valve seat erosion especially on exhaust valves- and 1300 RPM was the rough dividing line from no noticeable problem to need more maintenance, old JD 2 cylinders didn't have the problems, neither did the IHC F20s. IHC and Case, some AC and Oliver running 1650 to 2000 rpm had some noticeable wear, need for valve lash adjustment and early repairs. Ford Ns had stellite valve seats to begin with, no real problem. Cam timing/duration was another factor- short duration as common on slow movers helped heat transfer for exhaust valve. The Allis book recommended 100:1 2 stroke oil added to gasoline, IHC had one cup of engine oil- low ash straight weight IHC spec- to 5 gallons of gasoline for the M's, H's, 300, etc series. Valve guide/stem wear on some Olivers, Case- the engines that had valve stem seals had a minor wear problem, the older no seal designs had enough oil vapor from heads to handle lube needs for end of valve stem. 2 stroke oil, engine oil in gasoline handled that problem fairly well, repairs with knurled guides or the bottom only knurled or tapped would have a oil film retained, a bit of oil reservoir in grooves in guides--this was same type of minor work for air cooled engines like VW Beetles in desert racing, beat around town and some Harleys. Lead for higher octane and a secondary lubrication when using low octane base fuel was old protocol- newer gasoline base has higher octane already and the secondary lube requirements of some old tractors and cars can be handled with some 2 stroke oil or non detergent oil, Marvel Mystery oil, Ryslone. Aircooled engines operating at 3000 rpm as some of the old Brigges, Tecumsehs, Kohlers on some equipment had more problems with valve wear- but some had hard iron seats already- use 1/2-1/4 the Lawnboy recommended mix and the cheapest 4 stroke with seats ground into soft iron casting would last a bit longer- the aluminum cylinders and base head castings with soft iron seats on cheapest would get some help from the oil/fuel mix also- but most of those engines weren't meant for rebuilding anyway- disposables. The 1960s give or take a few/5 years engines with higher RPM use designed when lead was the standard were the most critical engines - the earliest engine were slower turning, the later engines had the harder seats and some had PCV that had oil vapor being burned instead of vented to outside air like the cars had by 1970. RN

Replies:

• Re: Lead additive to Gasoline Tractors David G 13:29:36 04/18/16 (0)

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