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Larson
 BoatUS Boat Groups/Manufacturer Forums>>Larson
Subject Topic: big block bravo 3 won’t crank Post ReplyPost New Topic
 
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larsonlester
"Seaman Recruit"




Joined: May 07 2010
Posts: 7
Posted: May 18 2011 at 15:49 | IP Logged Quote larsonlester

went to the lake, started up and let it run for about a minute then backed off the trailer.  when i do this i keep the engine compartment open just to look for leaks or some other disaster.  when i pulled my head out i noticed some blue/gray smoke coming from under the swim platform.  i shut it down right away and looked harder for something wrong, but couldn't see anything wrong.  when i restarted i noticed that it was hotter than usual (210 instead of 175) and it felt hot to touch so i pulled back to the dock and tied up, continuing to search for problems.  buy the time my wife came back from parking the engine wouldn't crank over.  the starter (or solenoid) clicks loudly but the engine doesn't turn over.  the batteries are strong and i have even tried it with the onboard charger on, to no avail.  if it was a truck motor i would put a wrench on the damper pulley bolt and see if it would turn over by hand.  lacking such a bolt i am lost. can anyone help?
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Tray
"Seaman Recruit"




Joined: May 15 2011
Posts: 3
Posted: May 21 2011 at 17:47 | IP Logged Quote Tray

If the starter is good, then sounds like "worse case" you spun a bearing or ceased a piston ...you need to bite the bullet and have a mechanic look at it.

The only way to spin the motor if it's not ceased is pull your plugs to eliminate compression and turn it by hand and/or starter...if you get it to turn run a compression check, this will tell you if the cylinders have good compression but, you may still have a spun bearing cam or main. Tough to decipher over the net without hands on.       

Good luck & remember sometimes it's cheaper to replace the motor than have one rebuilt  

__________________
1999 Larson Cabrio 33'
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larsonlester
"Seaman Recruit"




Joined: May 07 2010
Posts: 7
Posted: May 22 2011 at 10:13 | IP Logged Quote larsonlester

thanks for the answer tray, but i sure hope you are wrong!
lester
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larsonlester
"Seaman Recruit"




Joined: May 07 2010
Posts: 7
Posted: May 28 2011 at 09:18 | IP Logged Quote larsonlester

tray
since my last post many things have happened.  pulled plugs and water squirted out.  drained oil and found 3 quarts of water with oil.  now have removed elbows and manifolds, all appears to be in good shape with the possible exception of the gaskets, they seemed to be leaking some.  still wondering how far down the flapper valves might be, will probably go in search of today.
diamondl
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Tray
"Seaman Recruit"




Joined: May 15 2011
Posts: 3
Posted: May 31 2011 at 17:19 | IP Logged Quote Tray

 larsonlester

Sounds like a blown head gasket or worse case scenario cracked head...engines tend to blow a head gasket when overheated but, don't just replace the head gasket you need to have the head checked for cracks & flatness or you could end up in the same boat again (pun intended) ...pull the heads and send them out for rebuild and/or just checked "if your valves look good" then just have them checked,  check your cylinder walls for damage after you pull the heads. Sounds like you got off easy, little out of pocket but time consuming.

If the cylinders walls look good then get the heads down to any automotive/ machine shop that does heads... slap them back on your engine and you should be boating by next week : )

 PS> I would pull just the one head off the side that has water in cylinder & look at what kind of shape it's in "valves seats good & their clean" then have a shop check it for cracks & flatness, if the shop recommends you have the head rebuilt then pull the other one and do both sides...concentrate on the single head maybe you can get away with just replacing the one side w/ blown head gasket!          

    

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larsonlester
"Seaman Recruit"




Joined: May 07 2010
Posts: 7
Posted: June 06 2011 at 08:28 | IP Logged Quote larsonlester

tray
sorry i was gone so long.  found a complete lack of shutter valves, new ones in hand now.  need to pull outdrive today looking for leftover parts that may have blocked flow of cooling water.  boating by anytime this summer sounds good!   living at 8000 feet summer doesn't last too long!
diamondl
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Tray
"Seaman Recruit"




Joined: May 15 2011
Posts: 3
Posted: June 17 2011 at 20:45 | IP Logged Quote Tray

larsonlester

Well, The suspense is killing me. What did you find, what was the cause and what all did you have to repair? Does it float : )

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