Threw a rod two weeks before welch/ new motor break-in

Jet Bait

Jet Bait

New member
Well my motor threw a rod on sat.
I am going to pick up a new motor tomorrow that is a fresh build still on engine stand.
What do i need to do to break in the new motor?
Can i do it on the water hose at my shop, or do i need to have the pump loaded up in the water.
Anybody have a procedure on the do and donts of new boat motor break-in
 
duanehydro

duanehydro

Active member
I'm sure it has a flat tappet, so it need to bust off immediately, and have a zinc oil additive added to the oil. Motor needs to see varied rpm above 2500 for at least 10 minutes. Install the motor w/o the driveline to save the pump. pull motor, re-install driveline, go to lake. make damn sure you bought a marine-clearanced engine, or you'll be doing it again. (that's the short version, call if you need help. 361-550-9667 after 6pm)
 
B

buddyL

New member
that was a good question jc! i was just lookin into what duane was talkin about on marine-clearance! this is what i found! Marine Applications generally require an extra .001"-.003" clearance because of the possible combination of high load operation and cold water to the block. A cold block with hot pistons is what dictates the need for extra marine clearance
 
J

J C Gordon

New member
Makes sense. All my motors have been regular clearance. Maybe I'll extra clearance my next one. I try to have the engine run at around 160-180 degrees.
 
B

buddyL

New member
i done found out if u stay on THB long enuf someone will learn u something! i would have never thought about marine-clearance!
 
J

J C Gordon

New member
It's been said over and over to take everything with a grain salt. But we are luck enough to have some gurues that share their knowledge. And then we have most that like to share their ideas in times of insanity or under the influence of whatever.  :smile30:
 
Wakemaker

Wakemaker

Member
This is the first I've ever heard of such, is this something recommended for V-Drives as well?  I know my engine wasn't built that way.
 
Jet Bait

Jet Bait

New member
I guess it makes sense... pistons get real hot do to extended high rpms and expand, but the block doesnt cause it has cold lake water running through it at all times... i guess we will just need to find a hot tub to run our "non marine clearanced motors" in from now on...
 
C

CorDog009

Guest
I like mine to run around 190 or so at idle. If they get up to 200-210 I'll adjust the ball valve and let a little more water in. Once you get going the water temp will drop and you don't want it running too cold on a engine that doesn't have the clearances it needs. I like the engine to get hot enough to burn off any moisture/condensation that has built up.
 
Wakemaker

Wakemaker

Member
Jet Bait said:
I guess it makes sense... pistons get real hot do to extended high rpms and expand, but the block doesnt cause it has cold lake water running through it at all times... i guess we will just need to find a hot tub to run our "non marine clearanced motors" in from now on...
Click to expand...

I know of a hot tub we can go to it's called Lake Fayette!  :smile26:
 
Jet Bait

Jet Bait

New member
some friggin idiot welded the motor mounts (which are now shot) to the brackets for my 3-point mount... anybody have an extra one of these (3-point brackets) i could take off you hands.
 
Jet Bait

Jet Bait

New member
if all goes well today i should be headed to san jac on sunday for a test run/ motor break-in... anybody else going to be out there?
 
Jet Bait

Jet Bait

New member
View My Video <---- Click here to watch the video of new motor

8xtp3b.jpg

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77Jet Star

77Jet Star

Active member
Jet Bait said:
well, i didnt make it to the river on sunday... but i did get the motor runnin!!!
Click to expand...
Yea  I was looking for ya.Missed a good day nobody was there yesterday execpt for me and the 2 Swindolls.
 
Jet Bait

Jet Bait

New member
Took the boat out for a quick test run yesterday... runs like a champ. I got a few small things to take care of, but will def be ready for welch
 
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