Most all auto supply stores carry an adjustable gap jumping tool, usually less than 10 bucks. You can adjust the distance where the spark jumps to see how strong the spark is. Why replace parts until you know it is bad ?
Most all auto supply stores carry an adjustable gap jumping tool, usually less than 10 bucks. You can adjust the distance where the spark jumps to see how strong the spark is. Why replace parts until you know it is bad ?
Do you have a "Mercruiser" manual or an aftermarket manual ?
Correct no points or condenser in a delco est. If you are getting a good spark that jumps 1/4" gap or so then no the coil is not the issue
Hello, The manual that I am using is very similar & same part #, but the full version of https://www.aservicemanualpdf.com/S...Marine Engines GM 4 Cylinder 181 CID 3.0L.pdf
Hi, Yes, the total advance met what the service manual was calling for, in that range. I will go back to the air/fuel mixture screw # of turns again. I also initially thought that 4-5 turns out was turned too far out, but I made that adjustment in the middle of the lake, as it was recommended to make it on a warmed up engine. I recall it was very hard for me to tell the difference in RPM. smoothness, etc.. between 2 and 5 turns out from running too lean or too rich, the # of turns didn't seem to make as much of a difference as I thought it would when it was running at temp.
Oh, Yes, now with the words "Adjustable, and 'Jumping" added, I was able to locate one: https://www.walmart.com/ip/Convenie...Tool-with-Adjustable-Gap-Distance/14582409093. I will get that..so for this engine, I am looking for a blue spark that just has to jump at least 1/4" using this tool inline for each cylinder? I can do that. Thanks.
the idle mix screws wont make any difference how it runs at higher rpm , just indicative that something was off if it ran best that many screws out.
Yes, agreed something was off, and still is. I will go back to 2 turns out, then let it warm back up and check it again. I used an ultrasonic cleaner on carburetor venturi and as many smaller pieces that would fit in my 7" cleaner. I did not want to soak the whole carburetor body in a can of Berryman's or similar carburetor MEK or Acetone-based soak cleaner. - since that would also eat off the black OEM paint and that could plug up some of the orifices.
Uggh.. that is above my pay grade. Isn't there a better way to check for a stuck valve?
No, coils either work, or they dont
Timing
Guys, I will repeat that test with removing each spark plug wire while running checking the RPM's, and report back here. It was over a month ago , and a few other changes took place since that was tested.
I used simple green in an u on my friends holley off his Volvo penta , cleaned it and didn’t strip the finish. Simple green is what edlebrock recommends for its marine finish to not strip the gold Finish off.
That is very close to what I ran in my Ultrasonic cleaner for this carburetor.
