Quote:
Originally Posted by KNS
I could have sworn I watched Edd China remove a Triumph straight six head to rebuild the head and valve seats. The car had been running unleaded gas but wth a lead additive mixed in.
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There might be some other British engines built as cheap as the US made them and MG.
I mainly worked on Italian and German and Japanese cars and of course a ton of domestic iron and really just a sprinkling of British stuff, so I could be wrong and maybe some other British firms other than MG did it to. Jags. and Aston Martins had hardened seats and bronze valve guides, but they of course had Aluminum heads.
When I say MG I am thinking of the A series engine which is actually a Austin/BMC engine and was used in the MG midget, Mini, AH bug eye Sprite, Metropolitan Nash and most likely some other cars too. I really am not that familiar with all British makes.
I also never heard or seen a valve guides sizing because of unleaded gas.
I have seen them seize from old gas, which turns kind of like a hot glue. As long as the engine is warm it is OK but the next day valves glued in the guides. I have seen punched out lifter and bent push rods on a SBC from old gas and a 1922 dodge truck engine that pushed the valve guide in the head rather than slide the valve, it was so sized from old gas.
Old gas is really bad.