raw water pump merc 5.7L belt size information

jerryb1

Petty Officer 3rd Class
Joined
May 23, 2004
Messages
98
I bought a 94 Searay Express with a 5.7L last August. It started overheating this week because the impeller was bad. While replacing the impeller, I noticed the bracket that supports the pump from the opposite side of the engine was not connected to the engine frame, but just hanging there. The pump assembly has two bolts on top that hold it in place and the adjusting bracket on the bottom. The bracket goes under the flywheel and is supposed to be attached to the engine on the port side. I figured out where the bracket was supposed to connect, got the correct machine bolt to hook it up and then the frustration started. At first i thought the previous owner had just forgot to connect it(some mechanic!)
When I conneted the bracket, the belt was too tight. The adjusting bracket hits up against the pump assembly and will not allow the pump to be moved toward the flywheel. After about 3 hrs of frustration and many four letter words, I came to the conclusion that either the bracket is bent or the belt is not the right one. So I removed the bracket adjusted the tension and now the pump is held only by the two top bolts. It works fine, but I don't feel comfortable with it that way.
Is there a chart for determining the correct belt? I think a belt that is about 1/2-1" bigger will work.
Thanks,
Jerry
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,958
Re: raw water pump merc 5.7L belt size information

Ayuh,... Your post makes No sense,...
Never seen a raw water pump mounted Anywhere near the Flywheel....
 

jerryb1

Petty Officer 3rd Class
Joined
May 23, 2004
Messages
98
Re: raw water pump merc 5.7L belt size information

then whatever the wheel is called that is in the back of the engine that all the belts are connected to. ( toward the front of the boat)!
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: raw water pump merc 5.7L belt size information

then whatever the wheel is called that is in the back of the engine that all the belts are connected to. ( toward the front of the boat)!

That is actually the front of the engine. 99.9% of the boats have the engine setting with the belts to the front. Only a small few are installed opposite. Can we assume this engine is attached to a V drive?

Do you have a Mercruiser serial number handy? If so, then the proper belt size can be found.
 

jerryb1

Petty Officer 3rd Class
Joined
May 23, 2004
Messages
98
Re: raw water pump merc 5.7L belt size information

Yes, I mis spoke it's the front of the engine. I'll get the mercruiser # this weekend.
Thanks
 
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