1987 Mercruiser 3.0 Alpha One... Getting HOT

Dante04SRT

Petty Officer 1st Class
Joined
Jun 30, 2007
Messages
311
I just bought a 1987 ThunderCraft Regency w/ a Mercruiser 3.0 Alpha One setup and have a couple questions...

First and foremost, my wife and I took it out for a test run today and while it started and ran, it was getting very hot, very quick. My first thought was cracked block/head but the boat has always been a SE US boat, never really seen freezing temps... We took the hose that connects the water pump to the thermostat housing and noticed there was really no water to speak of inside. Should there be? I assumed it was just like a car, where water would come pouring out. My next thought was bad water pump or bad impeller... Sound about right? The water pump was running fine, no bearing noises, no water coming off it anywhere visible.

The other problem was the idle. I know the boat needs a tuneup, but I am going to attempt to do some of it myself. Is there an idle screw on the carb anywhere?

Last, the TILT/TRIM rams are either shot, or the fluid inside is bad. TILT/TRIM works, but VERY slowly and doesn't instill confidence. Is this something I can replace myself or is there more to it? The rams feel very spongy and almost like worn out shocks do on a car.

Ok, last one I swear... Where can I get parts for this setup? I would prefer to get them quickly, but I have never had to shop for this type of thing. Will people/companies understand what I have or is there some other identifier that I will need to include when ordering parts?

ANY HELP would be greatly appreciated, as I am very excited to get this baby out on the water and have some fun!

PICS, if anyone is interested:

http://s201.photobucket.com/albums/aa211/dante04srt/boat/
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,354
Re: 1987 Mercruiser 3.0 Alpha One... Getting HOT

1st,...... I'd do the Impeller Pump 1st.......

2nd,......It Sounds like a Weak Pump,....... Find a used 1,+ swap it out.......

3rd,...... On-line,+ Over-nite freight will get you Whatever you Want......
NAPA carries a full line of Sierra parts,...... Ask for catalog # MSP-7........
1987, 3.0l, Alpha 1 is the Required Info,..... The Serial # is sometimes a Plus........

Sweet Boat,........... Good Luck........
 

Dante04SRT

Petty Officer 1st Class
Joined
Jun 30, 2007
Messages
311
Re: 1987 Mercruiser 3.0 Alpha One... Getting HOT

1st,...... I'd do the Impeller Pump 1st.......

2nd,......It Sounds like a Weak Pump,....... Find a used 1,+ swap it out.......

3rd,...... On-line,+ Over-nite freight will get you Whatever you Want......
NAPA carries a full line of Sierra parts,...... Ask for catalog # MSP-7........
1987, 3.0l, Alpha 1 is the Required Info,..... The Serial # is sometimes a Plus........

Sweet Boat,........... Good Luck........

Thanks for the info, a few Q's in response...

For the tilt/trim rams, what specifically would I look for? What is the wording I'd use to search?

Also, I keep hearing about these "dogears" or "earmuffs" that allow you to connect the engine to a garden hose. Where do I get one of these?
 
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