Engine break in procedure?

maddog2

maddog2

Petty Officer 3rd Class
Joined
Apr 24, 2009
Messages
94
Due to a busted block and exhaust manifolds, I have ordered a remanufactured long block for my 1992 Mercruiser 4.3LX.

Once I have everything installed and running properly, what is the standard break in for this engine?
It is in a 1992 Celebrity 190BR 18'-7" long and about 2500 lbs.

James in NC
High Rock Lake
 
maddog2

maddog2

Petty Officer 3rd Class
Joined
Apr 24, 2009
Messages
94
Re: Engine break in procedure?

I downloaded the user manual for the Mercruiser engine 1983 to 1993. I found the break in procedure on new or remanufactured engines on page 15 of 439.

It says the first 20 hours is the standard break in.
it has several procedures to follow during and after the first 20 hours.

thanks anyway.

James in NC

High Rock Lake
 
O

o/b tech

Petty Officer 2nd Class
Joined
Apr 15, 2005
Messages
198
Re: Engine break in procedure?

In a nutshell, here is the break-in.

For the first hour, let the motor come up to operating temp and then bring the boat on plane. once there keep it on plane and no full throttle. Vary the load on the motor every five minutes, a couple hundred rpm change is all that is needed. No extended idling.

Hour number two. Change loads evey twenty minutes with short full throttle busrts.

Hours three to five. Put boat thru all operating ranges. Principle is to load motor without overloading, for long periods of time, and no long idling periods, other than warm up.

No pulling anything for fisrt ten hours.

After that should be good to go.
 
bruceb58

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,476
Re: Engine break in procedure?

Check your oil level often during break in.
 
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