1976 Century Arabian - Mercruiser 888 - Boat Restoration

jones01m

Petty Officer 1st Class
Joined
May 23, 2011
Messages
252
Archbuilder, thanks for the feedback. Over the years i have read through many of your projects and can certainly reciprocate the comment.

Next up is seeing if I can fix the power steering heat exchanger as it leaked during the break-in. I think I will fix or end up replacing everything before I am done! At least I will understand every detail of all the systems if something were to go wrong in the future. Kind of a mixed blessing I suppose.
 

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jones01m

Petty Officer 1st Class
Joined
May 23, 2011
Messages
252
Was gone all weekend, but managed to sneak in the power steering cooler repair. Looks good but needs pressure test to be sure. Easy repair with propane torch and solder used for copper home plumbing.
 

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jones01m

Petty Officer 1st Class
Joined
May 23, 2011
Messages
252
folks, I am a little anxious to keep after this build and started the pressure test for the power steering cooler. I just plugged the end of the hose that goes to the water distribution manifold at the thermostat and applied standard residential water pressure. It held for approximately 10 seconds then blew one of the hoses off a pvc fitting in my set-up. Not the thorough test I wanted, but no leaks, and I need to move on...

 

jones01m

Petty Officer 1st Class
Joined
May 23, 2011
Messages
252
Today was a great day. I had no weekend time but was able to peck away at this an hour or two in the evenings. Got the pertronix II electronic ignition installed, oil pressure switch installed and operating properly, and the power steering cooler installed and no leaks.

First start at idle. Previous start was only to perform the initial break in at 2000rpm for 20 minutes. This start I dialed things in and posted the advance curve in the attached photo. I have not run the vacuum gage for dialing in air mixture on carb but by ear it sounds pretty good. The dwell is automatically taken care of by the electronic ignition module.

The video is hard to hear. The belt was a bit loose and squealed at acceleration but she's good now. I am very happy with this milestone!




 

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jones01m

Petty Officer 1st Class
Joined
May 23, 2011
Messages
252
Archbuilder/Chevymaher, I appreciate it . Definitely a good feeling to get it started up.

This week has been very bittersweet. On Sunday I was going over the engine taking compression, looking for any oil leaks, and then checked dipstick for oil levels. The oil was milky. In fact, it was white. I changed the oil, ran the engine again and the milk cam back. Moisture and milk in the valve covers, could not hold a good idle, and vacuum gauge was bouncing around like crazy. For certain something bad had happened in the rebuild... something very bad. So I read, read some more, and talked about the issue to everyone I knew who knows something about cars and engines.

I figured for sure that the idle issue and milky oil were interrelated. The oil issue could be anything from cracked block to not running long enough.

Today a friend of mine encouraged me to take on one issue at a time and focus on dialing in the idle. I spent about 1/2 with engine running with a vacuum gauge hooked up and was able to dial it in. He also told me to run a little higher idle at about 800 rpm since the cam had a bit of a lope - pretty mild though. The temp during this process was between 160 and 180F. I kept running and dialing until it ran for about 45 minutes. Checked the oil and zero milk.

It turns out I had two separate issues. The idle was related to just spending time with dialing in the carb. The milking oil appears to be associated with not running long enough to burn of natural condensation while testing in very humid air (North Carolina). When I for the 45 minutes i could see some steam vent off from the rocker covers and it finally went away. I guess it makes sense and I am completely relieved that the problem was only the amount of time the engine ran. I used a stethoscope on all the intake and exhaust ports and all pistons were the same sound with almost zero tick - valve train good. No hissing, no nothing.

I am absolutely elated!

Video is attached showing some of the diagnostics.

 
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