Reply To: Restoration of 1964 3hp Johnson JH 19A

[Monte NZ]

Hi Fleetwin and Lindy46.and Mumbles
Sorry for the delay in replying to your posts…….computer keyboard decided to pack up!!!

First of all, thanks for your comments and advice.
In reply,I have done as you all suggested. Also, as several head studs threads were stripped, I fitted helicoils to all 6.
I also lapped both the head and the block .
I have run the motor for about an hour so far. Yesterday I rechecked the compressions and was surprised to see that they had both increased from 65 to 70 psi!
The motor has been completely repainted and after running it I expected the paint on the exhaust manifold to discolour. At this stage that hasn’t happened,
but I’m sure that will happen after some full throttle running.

One thing I have noticed and I would be very interested to hear your thoughts, is I can hear an intermittent rattling sound at idle speed and am wondering if it could be
wrist pin or big end bearing noise.

Thanks again for all your help.
Monte NZ