[AT] unleaded gasoline

[Ronald L. Cook]

Grant,
         I think these tractors should all have hardened valves and 
seats.  They should be okay, then.  Thanks.

Ron Cook
Salix, IA
>Ron, the issue as documented by several studies is twofold. If the valves 
>and seats are hardened, no real issue with valve wear, the issue with 
>removal of lead from Gasoline fuel. The second issue is how hard do the 
>tractors work. If they are worked hard, there will be serious wear and 
>repairs needed sooner if there are not hardened valeves and seats (valve 
>seats that is, not driver seats....)
>    So work them hard and make sure the hardened valves and seats are in 
> place, with 15W40 oil which is formulated correctly for the older machines....
>        Grant Brians
>        Hollister, California
>----- Original Message ----- From: "Ronald L. Cook" <rlcook at pionet.net>
>To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
>Sent: Friday, December 02, 2005 8:21 AM
>Subject: [AT] unleaded gasoline
>
>
>>Opinions please.  2510, 3010, and 4020 John Deere gas tractors.  Working 
>>tractors, not parade tractors.  Are they going to hold up on unleaded 
>>gasoline or do they need some lead from time to time?
>>
>>Ron Cook
>>Salix, IA