block surgery
Posted: Sun Sep 12, 2021 11:41 pm
The Wipac Silver Century I had had on the rail of my main boat as an emergency engine got a check over - and a I saw the block was developing a crack right on the impossible to clean area next to the inlet port.
Otherwise a good clean block ( I did this engine a few years back as a atrip and re-assemble job ) - it seemed a shame to let it go to waste.
My reckoning was to drill some holes to facilitate cleaning the area - and also to relieve any current built up stress. The crack was about an inch long - quite fine and level - but was obviously going to get worse !
I drilled three holes in the side of the exhaust flange - and two on the flat top. These enabled me to drill out the stubborn black sediment inside.I opened the crack slightly and filled it with thickened epoxy.
To plug them after tapping I used my worst condition old head bolts and cheeses heads - sawing off small threaded sections and cutting a slot for fixing.
After degreasing the tapped holes I just screwed them in with non setting black loctite.
If you cut a good deep slot they will file flush after inserting.
I could have fleathered them off with filler - sanded flat and painted ? - but they looked quite good, so I left them as they were. !
Otherwise a good clean block ( I did this engine a few years back as a atrip and re-assemble job ) - it seemed a shame to let it go to waste.
My reckoning was to drill some holes to facilitate cleaning the area - and also to relieve any current built up stress. The crack was about an inch long - quite fine and level - but was obviously going to get worse !
I drilled three holes in the side of the exhaust flange - and two on the flat top. These enabled me to drill out the stubborn black sediment inside.I opened the crack slightly and filled it with thickened epoxy.
To plug them after tapping I used my worst condition old head bolts and cheeses heads - sawing off small threaded sections and cutting a slot for fixing.
After degreasing the tapped holes I just screwed them in with non setting black loctite.
If you cut a good deep slot they will file flush after inserting.
I could have fleathered them off with filler - sanded flat and painted ? - but they looked quite good, so I left them as they were. !