Thursday, 28 April 2011

New Sprint engine (part 2)

Collected my two spare Sprint heads recently and took them to a friend’s workshop to get them cleaned a bit in preparation for flowing, polishing and rebuilding the best of the two. All in preparation for the rejuvenation of ‘t Kreng.


After cleaning, it was time to remove the valve gear from the second head. With the proper tools that wasn’t too difficult. The exhaust valves were removed rather quickly ...



Sadly though the valve spring compressor tool couldn’t be used on the inlet valves. So I had to revert to a slightly more robust approach, a correct size socket and a hammer! Worked pretty good and was even quicker than with the valve spring compressor!


With the valves removed it was time to inspect both heads. Overall they are both in fairly good condition, but it looks that both have been skimmed somewhere in the past. There are also some minor dents in the edge of a few chambers. These need to be filled in with some welding ...


Also one of the valve guides is damaged, which means all need to be renewed, but that gives me the chance to look for some slimmer lightweight valves ...


More can be gained by opening up and polishing the ports ...


And to finish, I at last got round to find someone who could machine some nice and shiny alloy spark plug tubes. First sample (to double check the measurements) looks really good, can’t wait to get them fitted to ‘t Kreng’s engine, as the (still original) spark plug tubes are starting to leak a little oil ...


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