unleaded or leaded?
Posted: Sat Jul 16, 2011 10:56 pm
If the old owner didn't know, how could you tell if a head was leaded or unleaded on a 1098 engine? 
Morris Minor Owners Club
Promoting the Preservation and Use of the Postwar Morris Minor
https://board.mmoc.org.uk/
unleaded or leaded?
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Re: unleaded or leaded?
Posted: Sat Jul 16, 2011 11:05 pm
It would have to have been 'converted' - so the inserts would be visible if the head was stripped and inspected. BUT - it doesn't matter! Just set the exhaust valve gaps to 15 thou - run it on unleaded fuel - check/reset the valve gaps every 3000 miles. Simples!!
Re: unleaded or leaded?
Posted: Sat Jul 16, 2011 11:13 pm
Valve gaps - i.e tappets yes? As per the MMOC service guide? 15 thou... 15 thousandths of an inch? 
Re: unleaded or leaded?
Posted: Sat Jul 16, 2011 11:21 pm
Well - the 'tappets' are down inside the block (cam followers really) and don't have 'gaps' on this OHV engine - but indeed it's the gap between the tip of each valve rocker and the valve stem.......and yes 0.015" = 15 thousandths of an inch (15 thou is easier!)
Re: unleaded or leaded?
Posted: Sat Jul 16, 2011 11:34 pm
Thank you BMC.