Engine won’t turn

maurice escobedo

Counselor
Oct 25, 2016
731
366
63
Bakersfield
Name
Esteban
Boat
24' Wellcraft air slot
sooooo, I get home from working out of town for a few months
, head out to the boat to give it a start and check her out to start getting her ready for a trip. Maintenance etc. Well, engine won’t turn and I mean won’t turn at all. Removed the starter to try and turn it from the flywheel and still nothing. Seems seized and I don’t understand how or why. Boat turned over fine prior to my leaving. I was having a fuel dilivery issue but that’s it.
Any ideas?
Thanks in advance
 

tuner

pysgotwyr
May 24, 2006
1,222
715
113
Huntington Beach
Name
Steve
Boat
260 Mackinaw
Pull the spark plugs and check for water. You may have an exhaust manifold or head gasket leak. The cylinder walls can rust and seize the pistons in a short time.
 
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maurice escobedo

Counselor
Oct 25, 2016
731
366
63
Bakersfield
Name
Esteban
Boat
24' Wellcraft air slot
Thanks guys awesome
It’s been sitting all winter as I’ve been working out of town. Such a drag.
 
Last edited:

karlow

Twins 2017
Apr 29, 2004
1,628
610
113
62
Duarte/Covina
Name
karl
Boat
20' skippy Topless /17' whaler Wet Ride (sold) /18' Outrage
I would guess the number one failure mode of I/O engines is exhust system failure. Pull all the plugs and inspect them for rust.
 
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plj46

I've posted enough I should edit this section
Jan 7, 2008
6,043
5,267
113
Socal
Name
jim
Boat
24 ft grady white
What motor ?
 

MATTANZA

old man of the sea, in training.
Aug 23, 2004
4,700
1,822
113
SAN DIEGO
Name
RICK
Boat
Boston Whaler 25' Outrage "MATTANZA II", 34' Radovcich "AMY ANNE" {when it needs to be fixed}
maybe your neutral safety switch or dead man switch.
 

SilentViper

Fishing fiend
Aug 21, 2012
10
8
3
Buena Park
Name
Jimmy McGinness
Boat
1975ish 20' Starfire Fisherman
Had this happen to my 305 after just 3 weeks of sitting about 2 months ago.

To free up the motor I "soaked down" all the cylinders with Marvels Mystery Oil for a day. Pull the plugs and look for water/rust to get an idea of which cylinders to focus on cleaning/flushing with MMO. The next day I pulled the water pump and pulley off the harmonic balancer, threaded 3 3/8"-24tpi grade 8 bolts into those water pump holes, and put a 4' crow bar on those bolts and slowly worked the motor free. Mine initially moved maybe 10 degrees the wrong way first. Slowly working it back and forth whichever way you can get a purchase on it to make it move. Once it was making full turns without getting stuck I tried the starter to let it flush all the remaining MMO out of the cylinders and kept re-spraying and reflushing until the MMO was coming back out clean. Once it's free and turning off the starter change the oil, find and fix the water leak, mine was the gasket between the exhaust manifold and the elbow, and i've not had a problem since.

This whole process took about 6-8 hours of hard pulling, yanking, standing on the crow bar, if you can't physically do it, ask your auto mechanic if they have anyone who can get a small block chevy freed up. My truck mechanic shop was willing to if i drug the boat over, said they free up SBCs all the time.

Good luck
 

maurice escobedo

Counselor
Oct 25, 2016
731
366
63
Bakersfield
Name
Esteban
Boat
24' Wellcraft air slot
Had this happen to my 305 after just 3 weeks of sitting about 2 months ago.

To free up the motor I "soaked down" all the cylinders with Marvels Mystery Oil for a day. Pull the plugs and look for water/rust to get an idea of which cylinders to focus on cleaning/flushing with MMO. The next day I pulled the water pump and pulley off the harmonic balancer, threaded 3 3/8"-24tpi grade 8 bolts into those water pump holes, and put a 4' crow bar on those bolts and slowly worked the motor free. Mine initially moved maybe 10 degrees the wrong way first. Slowly working it back and forth whichever way you can get a purchase on it to make it move. Once it was making full turns without getting stuck I tried the starter to let it flush all the remaining MMO out of the cylinders and kept re-spraying and reflushing until the MMO was coming back out clean. Once it's free and turning off the starter change the oil, find and fix the water leak, mine was the gasket between the exhaust manifold and the elbow, and i've not had a problem since.

This whole process took about 6-8 hours of hard pulling, yanking, standing on the crow bar, if you can't physically do it, ask your auto mechanic if they have anyone who can get a small block chevy freed up. My truck mechanic shop was willing to if i drug the boat over, said they free up SBCs all the time.

Good luck
Thanks a million jimmy. That’s the Father’s Day project instead of a Father’s Day fishing trip. Lol. Funny but not funny.
That’ll you everyone for tour responses.
 

Aggro

Keepin my pimp hand strong!
Mar 4, 2005
13,322
2,316
113
Clairemont
Name
AGGRO
Boat
skiff
Yep, Marvel oil after pulling the plugs. Not fun.