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Old 10-05-2021, 09:17 AM
Tripaddle Tripaddle is offline
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Rough running after extended running

Well letís start with I donít have enough time on the boat to properly do all the maintenance. I change the impeller and oil. Also I add a little Marvel Mystery oil to the fuel. We usually run for less than an hour at a time, maybe even less than 30 minutes. It always seems on the way back it runs rough. Lowering the rpm helps at first but this past weekend it ran rough even when I lowered the rpm. We probably never go above 1500 rpm. The temperature never moved while running at the dock for 30 minutes while propeller engaged. The oil pressure began around the 20 psi mark and increased to 40psi as it ran. It is raw water cooled. Iíve often thought I need to do something to get the temperature higher. Iím not sure the complete history of this motor. We bought the boat after it had been on the hard for 7 years. I rebuilt the carb, replaced fuel tank, fuel pump, filter, and all hoses. Iíve never touched the points in the 4 years weíve had it in the water of the Chesapeake Bay. When we bought it other than the fuel pump it cranked and ran. Itís in a 1976 Cal 2-27 and the motor looks fairly clean looking. This past weekend we lost all the wind and motored for over an hour. It never cuts off but does worry me that it might. Iíve ordered the tune up kit, coil, springs, and plug wires. Iím sure the points need replacing and springs oiled and inspected. Iím suspicious of the coil after the motor is warmed up. Iíve pumped gas from the bottom of the tank last year and found no water. Even after sitting for months it will start immediately. Thatís everything I can think to describe the motor. So would you think ignition is a good start? Should I worry about the motor temperature? Next time Iím using my pc instead of typing all this on my phone!
1976 Cal 2-27
Lancaster, VA
Charlotte, NC
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Old 10-05-2021, 11:14 AM
Dave Neptune Dave Neptune is offline
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David, sounds as if you are on the right path. Give it a thorough tune-up. Lube the C-advance and replace the points, plugs, condenser, coil and wires.

It is a VERY good idea on these old motors to set the "dwell" with a meter as the cam lobes in the distributor are very worn by now. This wear is bad for the points and makes setting without the meter a guess at best. However with an EI the "dwell" issues are long gone and tuning will be in the past.
A great idea if the budget permits.

Dave Neptune
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  #3   IP:
Old 10-06-2021, 11:05 PM
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sastanley sastanley is offline
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David, How often do you use the boat? In the mid-Chesapeake growth on the prop is a HUGE problem. The boat sitting for extended periods (a few weeks!) can let junk grow on the prop.
I highly recommend you get the prop cleaned and report back. I have resorted to short hauling my boat mid-season in early August a few (several) miles north in Solomons, MD, so I do not get frustrated with the engine running poorly with a fouled prop. I keep my boat in a "clean marina", I don't think I can hire a diver and follow the clean marina guidelines. I have no idea what your situation is where you are, but get I recommend you get the prop cleaned without wasting time on other stuff first and let's go from there.
You have a lot of issues going on..I am just trying to help isolate. All of Dave Neptune's suggestions are good too..just don't blow lots of money until the prop is 100%..
"Twice Around" - '77 Catalina 30, #511 with original A-4 & MMI manifold.
She is even happier with fresh paint on the topsides!

Last edited by sastanley; 10-06-2021 at 11:19 PM.
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Old 10-07-2021, 07:19 AM
ArtJ ArtJ is offline
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A Ignitor upgrade would be a great improvement easy swapout with points

This is for late model A4 There is also a Early model kit

Best Art
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