The purpose of this post is to share my experience with my shift interrupt switch rigging. This is the assembly on my old 1972 MC-R that is mounted on the transom plate behind the motor. After pulling the out drive and doing routine maintenance (billows cracked) around midseason I had an...
I went to reinstall my drive today and noticed that the O-ring for the water tube is too big. I rechecked my part number 25-33504 and that seems to be the right number at least according to my Mercruiser dealer and marineengines.com illustrated parts diagram. It is clearly too big though to fit...
Can an exhaust tube be used on a 140hp mercruiser instead of the exhaust bellows? Do you even need the exhaust bellows? Some boats have open exhaust so just wondering. If you can use an exhaust tube what is the part number? This a 1974 setup.
I have a 1974 OMC 3.0L motor that I have since converted to mercruiser. Over the years it developed a clicking sound that was very much like a lifter so I decided to replace the lifters. Now, assuming that all of the 3.0 motors are pretty much the same I went to the mercruiser book and found...
I am running an electronic ignition conversion on my 1974 3.0L. I have a couple of projects going on right now. The drive is off and the billows are out. replacing the billows. While I was at it I decided to replace the lifters as well. I have had one talking to me for a couple of years. Since I...
The choke heat riser tube is broken. Does that part just press into the exhaust manifold is the repair to just bend up a new tube, drill out the one in the manifold, and push the new tube into the hole? If so does anyone know the right size drill bit? Should I braze the new tube into the hole...
I am getting some rattling from the engine compartment. Investigation seems to indicate that the bell housing on the back of the motor is hitting the mounting bracket on the transom at idle. Putting a screw driver between them while the motor is running elminates the rattle / banging noise. Also...
Motor starts easily but is rough. Bring the RPM up to 2000 on just the throttle and let it warm up and things smooth out. Bring the throttle back to idle and it is smooth but let it sit for a a minute or two and it gets rough. Kind of like something is hitting or misfiring. Advance throttle to...
Engine is running ok, but at idle there is some vibration. I checked my compression. #2 is 100 psi which is low. Oil in the cylinder brings it right up to 125 psi. #3 is low at 85 psi and oil has no impact. So the guess is valves. I learned how to do the compression check from the forums so here...
While tracking down a clicking sound coming from my 1974 3.0L Mercruiser I decided to check compressions. They were 120,100,90,120. Do the lower compressions for #2 and #3 cause problems? Is it time to overhaul? Clicking turned out to be a little rocker adjustment. Nothing big there. Thoughts on...
Bought a 1961 40hp Johnson RDS-23. When I pulled the motor arrived I noticed that there was lower unit oil leaking out of the water intake from the motor sitting sideways I assume on the pallet. I pulled the lower unit off and then pulled the water pump housing. Sure enough under the water pump...
Got my classic johnson 40HP outboard motor started today. Seemed to go ok.
here is a picture of it running.
After running i drained my test tank and the lower unit looked like this
Is this ok? Is this just exhaust goop from running in the test tank.
And finally, here is a video of the...
Trying to get my 1962 40hp johnson running. I have spark on both cylinders with the points set correctly. Fuel is running every where. Fuel is running out of the mouth of the carb just from normal cranking on the engine. I cranked and watched the joke. It appears to be activating based on the...
