"I have a pr of old 1973 carb
"I have a pr of old 1973 carb Mercuiser 5lt inboards. The port motor has developed a tapping sound that sounds like loose tappets. They are not loose, replaced all the hyd. lifers, no difference. With the rocker cover off the sound is not from there. Using a stethescope it sounds like it's coming from No. 2 but top end not from the big ends. Sort of piston height. It's a light tap like a tappet knock. It's been suggested I've worn a lobe off the cam. Any suggestions would be welcome. Really don't want to have to pull the engine if i don't have to.
Thanks
Rob"
"I have a pr of old 1973 carb Mercuiser 5lt inboards. The port motor has developed a tapping sound that sounds like loose tappets. They are not loose, replaced all the hyd. lifers, no difference. With the rocker cover off the sound is not from there. Using a stethescope it sounds like it's coming from No. 2 but top end not from the big ends. Sort of piston height. It's a light tap like a tappet knock. It's been suggested I've worn a lobe off the cam. Any suggestions would be welcome. Really don't want to have to pull the engine if i don't have to.
Thanks
Rob"