Running engine on stand after rebuild

fishaman

Seaman Apprentice
Joined
Mar 25, 2010
Messages
45
2001 5.7 vortec carbed.

I am ready to start my engine for the first time after rebuild. It sits on a cradle, water and gas are hooked up. Exhaust is assembled, including the Y-pipe to divert the water output away. Mechanical oil pressure sensor is connected to the spare port in remote oil filter bracket. Have a laser remote heat sensor to keep track of the engine temprerature. Hooked up a multimeter with induction pickup to read the RPM. I have also rigged a remote starter control exactly as described by Don S., special thanks for the idea to use a lighted ignition switch, it works great and helps a lot. Starter turns the engine just fine.

I am pretty much ready to scare the neighbors with the unmuffled sound of 350, but that's my first time, so there's a couple of questions:

- After the first start, I need to keep my RPM at 2000 for about 20 minutes. Is there a standard, or just simple and smart way to control the throttle when the engine is out of the boat? Probably not a good idea to hold it by hand all this time.
- When I filled the fresh water system, it only took 16 quarts of coolant. The manual says it should take 20. I use the radiator cap with a lever, so should I just touch the lever to relieve pressure, and backfill after the operation temp is reached?

I am sure there are other important things need to be watched, any shared experience will be greatly appreciated.
 

fishrdan

Admiral
Joined
Jan 25, 2008
Messages
6,989
Re: Running engine on stand after rebuild

I used a small bungee cord to keep the throttle closed while running my engine on the ground, then turned up the idle speed adjustment to get it above 1500RPM for the 20 minute cam break-in.

The neighbors are going to love you... :D
 

a70eliminator

Captain
Joined
Sep 9, 2007
Messages
3,742
Re: Running engine on stand after rebuild

Sounds like you know what your doing, the carburetor fast idle screw should yeild 2000R's easy enough, engine run-in can can generate alot of heat and two 10 minute 2000RPM runs are better than an overheat.
You didn't mention the timing light.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Running engine on stand after rebuild

When I filled the fresh water system, it only took 16 quarts of coolant. The manual says it should take 20.

Make sure the front of the engine is a little higher than the back, or you will get an air lock in the block and overheat it.

And, as eliminator mentioned, you need to set the timing before the run. At least get it fairly close.
 
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