Posted by jdemaris on October 04, 2010 at 10:02:50 from (67.142.130.45):
In Reply to: Re: Lead addatives posted by Kruse on October 04, 2010 at 09:45:12:
I don't know what the guy has, but many if not most older tractors will last longer with lead additive, IF used like real farm tractors - which I assume rarely happens anymore. Valve recession happens when a tractor is run hot and hard, all day, and has no hardened valve seats. Also, those that have had valve-jobs in the past 20 years might have been upgraded with hard seats anyway.
I can't give a specific list, but I used to do a lot of valve work on pre-1960 tractors (still do some). Very few came OEM with hardened valve seat inserts (that don't suffer from recession). Obviously, some did, but it was not standard.
I just did a valve job on an late 50s Oliver with a Hercules engine - and it has NO seat-inserts. Also just did a Deere 1960 1010 and a 1966 350, and again . . no inserts. Also recently did a Ferguson 1959 TO35 with a Continental Z-134 and it also had no seat inserts. I've also know that my Case DCs, VACs, and 530 also do not have hardened seats. My Shaw tractor with a Wisconsin engine does have them OEM.
Seems the question should be which ones did, instead of which ones did not. I know many Ford engines had them. Many air-cooled engines also had them. Not sure what else.
There were controlled tests done on many no-hard-seat engines run on unleaded gas - and there is NO doubt they suffer when used hard and long. But, when used part-time, it's not an issue.
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