Crabbing4Fun
Cadet
- Joined
- Apr 18, 2020
- Messages
- 6
I bought a Mercruiser 3.0 181 with a knock for a good price. It had a knock which turned out to be a spun bearing which was an easy fix. This motor ran before I rebuilt it.
I did not pull the crank or the cam during the rebuild.
I have spark on all 4, tested by grounding and visibly seeing spark.
I have fuel, can see it in the carb when throttle applied, also can smell it in the cylinder.
I have compression, 140-150 in all 4.
I did have the head machined. The guy said that one of the valves was tuliped. I brought it in because I had poor compression on #4 before the rebuild.
The shift interrupt switch is in the correct position (in the middle), and I do get spark.
I checked the kill switch, I even cut the kill switch wires and checked with an OHM meter to make sure it works.
I thought I might have had the distributor 180, so I flipped it around, and it "tries" to start, but also tries to jump out of the boat I am assuming that it was wrong. I put it back to where I think its firing on the compression stroke and it will not fire. It sounds good when its trying to start, it just doesn't fire. I have verified top dead center and that the rotor is over #1 too many times.
The firing order is correct, I had someone else look at it thinking I messed something up.
I am going a little crazy here. By all accounts this engine should fire right up. I have read quite a few great posts by people walking through steps to get spark or fuel, but I have those.
I did something stupid I am sure, I just can't see what because I have been looking at it too long and I am "nose blind". Just need some pointers. Like a sensor that won't let it start for whatever reason?!? I am at a loss.
Thank you much for your time!
I did not pull the crank or the cam during the rebuild.
I have spark on all 4, tested by grounding and visibly seeing spark.
I have fuel, can see it in the carb when throttle applied, also can smell it in the cylinder.
I have compression, 140-150 in all 4.
I did have the head machined. The guy said that one of the valves was tuliped. I brought it in because I had poor compression on #4 before the rebuild.
The shift interrupt switch is in the correct position (in the middle), and I do get spark.
I checked the kill switch, I even cut the kill switch wires and checked with an OHM meter to make sure it works.
I thought I might have had the distributor 180, so I flipped it around, and it "tries" to start, but also tries to jump out of the boat I am assuming that it was wrong. I put it back to where I think its firing on the compression stroke and it will not fire. It sounds good when its trying to start, it just doesn't fire. I have verified top dead center and that the rotor is over #1 too many times.
The firing order is correct, I had someone else look at it thinking I messed something up.
I am going a little crazy here. By all accounts this engine should fire right up. I have read quite a few great posts by people walking through steps to get spark or fuel, but I have those.
I did something stupid I am sure, I just can't see what because I have been looking at it too long and I am "nose blind". Just need some pointers. Like a sensor that won't let it start for whatever reason?!? I am at a loss.
Thank you much for your time!